Cypress Semiconductor Corporation • 198 Champion Court • San Jose,CA 95134-1709 • 408-943-2600
Document Number: 002-08511 Rev. *D Revised June 28, 2017
MB3771
Power Supply Monitor
Description
The Cypress MB3771 is designed to monitor the voltage level of one or two power supplies (+5 V and an arbitrary voltage) in a
microprocessor circuit, memory board in large-size computer, for example.
If the circuit’s power supply deviates more than a specified amount, then the MB3771 generates a reset signal to the microprocessor.
Thus, the computer data is protected from accidental erasure.
Using the MB3771 requires few external components. To monitor only a +5 V supply, the MB3771 requires the connection of one
external capacitor. The level of an arbitrary detection voltage is determined by two external resistors. The MB3771 is available in an
8-pin Dual In-Line, Single In-Line Package or space saving Flat Package.
Features
■Precision voltage detection (VSA = 4.2 V ± 2.5 %)
■User selectable threshold level with hysteresis (VSB = 1.23 V ± 1.5 %)
■Monitors the voltage of one or two power supplies (5 V and an arbitrary voltage, >1.23 V)
■Usable as over voltage detector
■Low voltage output for reset signal (VCC = 0.8 V Typ)
■Minimal number of external components (one capacitor Min)
■Low power dissipation (ICC = 0.35 mA Typ, VCC = 5 V)
■Detection threshold voltage has hysteresis function
■Reference voltage is connectable.
■One type of package (SOP-8pin : 1 type)
Application
■Industrial Equipment
■Arcade Amusement etc.
Document Number: 002-08511 Rev. *D Page 2 of 22
MB3771
Contents
Description ............................................................................. 1
Features .................................................................................. 1
Application ............................................................................. 1
Contents ................................................................................. 2
1. Pin Assignment ................................................................. 3
2. Block Diagram ................................................................... 3
3. Functional Descriptions .................................................... 4
4. Function Explanation ........................................................ 4
5. Absolute Maximum Ratings ............................................. 5
6. Recommended Operating Conditions ............................. 5
7. Electrical Characteristics .................................................. 6
7.1 DC Characteristics ..................................................... 6
7.2 AC Characteristics ...................................................... 7
8. Application Circuit ............................................................. 8
8.1 5V Power Supply Monitor ........................................... 8
8.2 5V Power Supply Voltage Monitor
(Externally Fine-Tuned Type) ........................................... 8
8.3 Arbitrary Voltage Supply Monitor ................................ 9
8.4 5 V and 12 V Power Supply Monitor (2 types of power
supply monitor VCC1 = 5 V, VCC2 =12 V) ..................... 10
8.5 5 V and 12 V Power Supply Monitor (RESET signal is
generated by 5 V, VCC1 = 5 V, VCC2 = 12 V) ............... 10
8.6 5 V Power Supply Monitor with forced RESET input
(VCC = 5 V) .................................................................... 11
8.7 5 V Power Supply Monitor with Non-inverted
RESET ............................................................................ 11
8.8 Supply Voltage Monitoring with Delayed Trigger ..... 11
8.9 Dual (Positive/Negative) Power Supply Voltage
Monitoring (VCC = 5 V, VEE = Negative Power Supply). 12
8.10 Reference Voltage Generation and Voltage Sagging
Detection ........................................................................ 12
8.11 Low Voltage and Over Voltage Detection
(VCC = 5 V) .................................................................... 14
8.12 Detection of Abnormal State of Power Supply System
(VCC = 5 V) .................................................................... 14
8.13 Back-up Power Supply System (VCC = 5 V) ......... 15
9. Typical Characteristics ................................................... 17
10. Notes on Use .................................................................. 19
11. Ordering Information ..................................................... 19
12. RoHS Compliance Information ..................................... 19
13. Package Dimensions ..................................................... 20
Document History ................................................................ 21
Sales, Solutions, and Legal Information ........................... 22
Document Number: 002-08511 Rev. *D Page 3 of 22
MB3771
1. Pin Assignment
2. Block Diagram
(SOE008)
CT
VSC
OUTC
GND VCC
VSB RESIN
VSA
RESET
(TOP VIEW)
1
2
3
4
8
7
6
5
V
SA
V
SB
/
RESIN
RESET
≅ 1.24 V
≅ 12 μA≅ 10 μA
≅ 1.24 V
REFERENCE VOLTAGE
≅ 40 kΩ
−
+
Comp. A
Comp. B R
S
Q
V
CC
V
SC
GND
C
T
OUT
C
7
6
5
2
4
38
1
Comp. C
+
−
−
+
++
−
−
≅ 100 kΩ
Document Number: 002-08511 Rev. *D Page 4 of 22
MB3771
3. Functional Descriptions
Comparators Comp.A and Comp.B apply a hysteresis to the detected voltage, so that when the voltage at either the VSA or VSB pin
falls below 1.23 V the RESET output signal goes to “low” level.
Comp. B may be used to detect any given voltage(8.Application Circuit 8.3 : Arbitrary Voltage Supply Monitor), and can also be used
as a forced reset pin (with reset hold time) with TTL input (8.Application Circuit 8.6 : 5V Power Supply Monitor with forced RESET input
(VCC = 5 V) ).
Note that if Comp.B is not used, the VSB pin should be connected to the VCC pin (8.Application Circuit 8.1 : 5V Power Supply Monitor).
Instantaneous breaks or drops in the power supply can be detected as abnormal conditions by the MB3771 within a 2 µs interval.
However because momentary breaks or drops of this duration do not cause problems in actual systems in some cases, a delayed
trigger function can be created by connecting capacitors to the VSA or VSB pin (8.Application Circuit 8.8 : Supply Voltage Monitoring
with Delayed Trigger).
Because the RESET output has built-in pull-up resistance, there is no need to connect to external pull-up resistance when connected
to a high impedance load such as a CMOS logic IC.
Comparator Comp. C is an open-collector output comparator without hysteresis, in which the polarity of input/output characteristics
is reversed. Thus Comp. C is useful for over-voltage detection (8.Application Circuit 8.11 : Low Voltage and Over Voltage Detection
(VCC = 5 V) ) and positive logic RESET signal output (8.Application Circuit 8.7 : 5 V Power Supply Monitor with Non-inverted RESET),
as well as for creating a reference voltage (8.Application Circuit 8.10 : Reference Voltage Generation and Voltage Sagging Detection).
Note that if Comp. C is not used, the VSC pin should be connected to the GND pin (Application Circuit 1 : 5V Power Supply Monitor).
4. Function Explanation
1. When VCC rises to about 0.8V, RESET goes low.
2. When VCC reaches VS +VHYS, CT then begins charging. RESET remains low during this time
3. RESET goes high when CT begins charging.
TPO ≈ CT × 10 5 (Refer to “CT pin capacitance vs. reset hold time” in “9.Typical Characteristics”.)
4. When VCC level drops lower then VS, then RESET goes low and CT starts discharging.
5. When VCC level reaches VS + VHYS, then CT starts charging.
In the case of voltage sagging, if the period from the time VCC goes lower than or equal to VS to the time VCC reaches VS +VHYS
again, is longer than tPI, (as specified in the 7.2.AC Characteristics), CT is discharged and charged successively.
6. After TPO passes, and VCC level exceeds VS + VHYS, then RESET goes high.
7. Same as Point 4.
8. RESET remains low until VCC drops below 0.8V.
VCC
CTRESET
1
2
3
4
8
7
6
5
RESET
V
CC
VS
0.8 V
VHYS
(1) (2) (3) (4) (5) (6) (7) (8)
TPO TPO
t
t
Document Number: 002-08511 Rev. *D Page 5 of 22
MB3771
5. Absolute Maximum Ratings
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in
excess of absolute maximum ratings. Do not exceed these ratings.
6. Recommended Operating Conditions
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device.
All of the device’s electrical characteristics are warranted when the device is operated within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation outside these ranges
may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users
considering application outside the listed conditions are advised to contact their Cypress representatives beforehand.
Parameter Symbol Rating Unit
Min Max
Power supply voltage VCC −0.3 +20 V
Input voltage VSA −0.3 VCC + 0.3 ( < +20) V
VSB −0.3 +20 V
VSC −0.3 +20 V
Power dissipation PD–200 (Ta ≤ 85°C) mW
Storage temperature Tstg −55 +125 °C
Parameter Symbol Value Unit
Min Max
Power supply voltage VCC 3.5 18 V
Output current IRESET 020mA
IOUTC 06mA
Operating ambient temperature Ta −40 +85 °C
Document Number: 002-08511 Rev. *D Page 6 of 22
MB3771
7. Electrical Characteristics
7.1 DC Characteristics
(VCC = 5 V, Ta = + 25°C)
Parameter Symbol Conditions Value Unit
Min Typ Max
Power supply current ICC1 VSB = 5 V, VSC = 0 V – 350 500 µA
ICC2 VSB = 0 V, VSC = 0 V – 400 600 µA
Detection voltage VSAL
(DOWN)
VCC 4.10 4.20 4.30 V
Ta = −40°C to +85°C 4.05 4.20 4.35 V
VSAH (UP) VCC 4.20 4.30 4.40 V
Ta = −40°C to +85°C 4.15 4.30 4.45 V
Hysteresis width VHYSA – 50 100 150 mV
Detection voltage VSB VSB 1.212 1.230 1.248 V
Ta = −40°C to +85°C 1.200 1.230 1.260 V
Deviation of detection voltage ΔVSB VCC = 3.5 V to 18 V – 3 10 mV
Hysteresis width VHYSB –142842mV
Input current IIHB VSB = 5 V – 0 250 nA
IILB VSB = 0 V – 20 250 nA
Output voltage VOHR IRESET = −5 μA, VSB = 5 V 4.5 4.9 – V
VOLR IRESET = 3mA, VSB = 0 V – 0.28 0.4 V
IRESET = 10mA, VSB = 0 V – 0.38 0.5 V
Output sink current IRESET VOLR = 1.0 V, VSB = 0 V 20 40 – mA
CT charge current ICT VSB = 5 V, VCT = 0.5 V 9 12 16 µA
Input current IIHC VSC = 5 V – 0 500 nA
IILC VSC = 0 V – 50 500 nA
Detection voltage VSC – 1.225 1.245 1.265 V
Ta = −40°C to +85°C 1.205 1.245 1.285 V
Deviation of detection voltage ΔVSC VCC = 3.5 V to 18 V – 3 10 mV
Output leakage current IOHC VOHC = 18 V – 0 1 µA
Output voltage VOLC IOUTC = 4 mA, VSC = 5 V – 0.15 0.4 V
Output sink current IOUTC VOLC = 1.0 V, VSC = 5 V 6 15 – mA
Reset operation minimum
supply voltage
VCCL VOLR = 0.4 V, IRESET = 200 µA– 0.81.2V
Document Number: 002-08511 Rev. *D Page 7 of 22
MB3771
7.2 AC Characteristics
(VCC = 5 V, Ta = + 25°C, CT = 0.01 µF)
*1: In case of VSB termination.
*2: In case of VSC termination.
Parameter Symbol Conditions Value Unit
Min Typ Max
VSA, VSB input pulse width tPI –5.0––µs
Reset hold time tPO –0.51.01.5ms
RESET rise time trRL = 2.2 kΩ,
CL = 100 pF
–1.01.5µs
RESET fall time tf–0.10.5µs
Propagation delay time tPD*1––210µs
tPHL*2RL = 2.2 kΩ,
CL = 100 pF
–0.5–µs
tPLH*2–1.0–µs
Document Number: 002-08511 Rev. *D Page 8 of 22
MB3771
8. Application Circuit
8.1 5V Power Supply Monitor
Monitored by VSA. Detection threshold voltage is VSAL and VSAH
8.2 5V Power Supply Voltage Monitor (Externally Fine-Tuned Type)
The VSA detection voltage can be adjusted externally.
Resistance R1 and R2 are set sufficiently lower than the IC internal partial voltage resistance, so that the detection voltage can be set
using the ratio between resistance R1 and R2. (Refer to the table below).
■R1, R2 calculation formula (when R1 << 100 kΩ, R2 <<40 kΩ)
VSAL ≈ (R1 + R2 ) × VSB /R2 [V], VSAH ≈ (R1 + R2 ) × (VSB + VHYSB) / R2 [V]
R1 (kΩ)R
2 (kΩ) Detection voltage : VSAL (V) Detection voltage : VSAH (V)
10 3.9 4.37 4.47
9.1 3.9 4.11 4.20
VCC
CT
RESET
MB3771
1
2
3
4
8
7
6
5
Logic
circuit
V
CC
C
T
RESET
MB3771
1
2
3
4
8
7
6
5
R
1
R
2
Logic
Circuit
Document Number: 002-08511 Rev. *D Page 9 of 22
MB3771
8.3 Arbitrary Voltage Supply Monitor
8.3.1 Case: VCC
≤
18 V
■Detection Voltage can be set by R1 and R2.
Detection Voltage = (R1 + R2) ⋅ VSB/R2
■Connect Pin 7 to VCC when VCC less than 4.45 V.
■Pin 7 can be opened when VCC greater than 4.45 V
Power Dissipation can be reduced.
Note: Hysteresis of 28 mV at VSB at termination is available.
Hysteresis width dose not depend on (R1 + R2).........
8.3.2 Monitoring VCC > 18 V
■Detection Voltage can be set by R1 and R2
Detection Voltage = (R1 + R2) × VSB/R2
■The RESET signal output is ≈ 0V (low level) and ≈ 5 V (high level). VCC voltage cannot be output.
Do not pull up RESET to VCC.
■Changing the resistance ratio between R4 and R5 changes the constant voltage output, thereby changing the voltage of the
high level RESET output. Note that the constant voltage output should not exceed 18 V.
■The 5 V output can be used as a power supply for control circuits with low current consumption.
■In setting the R3 resistance level, caution should be given to the power consumption in the resistor. The table below lists
sample resistance values for reference (using 1/4 Ω resistance).
■Values are actual measured values (using IOUTC = 100 μA, VOLC = 0.4 V). Lowering the resistance value of R3 reduces the
minimum supply voltage of the RESET output, but requires resistance with higher allowable loss.
VCC (V) Detection
voltage (V)
RESET Output min. power
supply voltage (V) R1 (MΩ) R2 (kΩ) R3 (kΩ) Output Current
(mA)
140 100 6.7 1.6 20 110 < 0.2
100 81 3.8 1.3 20 56 < 0.5
40 33 1.4 0.51 20 11 < 1.6
V
CC
C
T
RESET
MB3771
1
2
3
4
8
7
6
5
R
1
R
2
V
CC
C
T
RESET
1
2
3
4
8
7
6
5
R
3
R
1
R
2
R
4
:
R
5
:
33 kΩ
0.47 μF
100 kΩ
5 V output(Stablized)
Document Number: 002-08511 Rev. *D Page 10 of 22
MB3771
8.4 5 V and 12 V Power Supply Monitor (2 types of power supply monitor VCC1 = 5 V, VCC2 =12 V)
■5 V is monitored by VSA. Detection voltage is about 4.2 V
■12 V is monitored by VSB. When R1 = 390 kΩ and R2 = 62 kΩ, Detection voltage is about 9.0 V.Generally the detection voltage is
determined by the following equation.
Detection Voltage = (R1 + R2) × VSB/R2
8.5 5 V and 12 V Power Supply Monitor (RESET signal is generated by 5 V, VCC1 = 5 V, VCC2 = 12 V)
■5 V is monitored by VSA, and generates RESET signal when VSA detects voltage sagging.
■12 V is monitored by VSC, and generates its detection signal at OUTC.
■The detection voltage of 12 V monitoring and its hysteresis is determined by the following equations.
Detection voltage = R1 + R2 + R3 × VSC (8.95 V in the circuit above)
R2 + R3
Hysteresis width = R1 (R3 − R3 // R4) × VSC (200 mV in the circuit above)
(R2 + R3) (R2 + R3 // R4)
V
CC2
C
T
MB3771
1
2
3
4
8
7
6
5
R
1
: 390 kΩ
R
2
: 62 kΩ
RESET
V
CC1
Logic
circuit
V
CC2
C
T
MB3771
1
2
3
4
8
7
6
5
R
1
: 390 kΩ
R
2
: 33 kΩ
RESET
V
CC1
IRQ
R
L
: 10 kΩ
R
5
: 100 kΩ
R
3
: 30 kΩ
R
4
: 510 kΩ
or
Port Logic Circuit
Document Number: 002-08511 Rev. *D Page 11 of 22
MB3771
8.6 5 V Power Supply Monitor with forced RESET input (VCC = 5 V)
RESIN is an TTL compatible input.
8.7 5 V Power Supply Monitor with Non-inverted RESET
In this case, Comparator C is used to invert RESET signal. OUTC is an open-collector output.
RL is used an a pull-up resistor.
8.8 Supply Voltage Monitoring with Delayed Trigger
When the voltage shown in the diagram below is applied at VCC, the minimum value of the input pulse width is increased to 40 µs
(when C1 = 1000 pF).
The formula for calculating the minimum value of the input pulse width [TPI] is:
TPI [µs] ≈ 4 × 10-2 × C1 [pF]
RESIN
C
T
MB3771
1
2
3
4
8
7
6
5
RESET
V
CC
Logic Circuit
C
T
MB3771
1
2
3
4
8
7
6
5
R
L
: 10 kΩ
V
CC
RESET
CT
MB3771
1
2
3
4
8
7
6
5
VCC
TP
RESET
C1
5 V
4 V
Document Number: 002-08511 Rev. *D Page 12 of 22
MB3771
8.9 Dual (Positive/Negative) Power Supply Voltage Monitoring (VCC = 5 V, VEE = Negative Power Supply)
Monitors a 5 V and a negative (any given level) power supply. R1, R2, and R3 should be the same value.
Detection Voltage = VSB − VSB × R4/R3
Example if VEE = −5 V, R4 = 91 kΩ
Then the detected voltage = −4.37 V
In cases where VEE may be output when VCC is not output, it is necessary to use a Schottky barrier diode (SBD).
8.10 Reference Voltage Generation and Voltage Sagging Detection
8.10.1 9V Reference Voltage Generation and 5V/9V Monitoring
Detection Voltage = 7.2 V
In the above examples, the output voltage and the detection voltage are determined by the following equations:
Detection Voltage = (R1 + R2) × VSB/R2
C
T
MB3771
1
2
3
4
8
7
6
5
RESET
V
CC
V
EE
0.22 μF
R
4
R
5
: 5.1 kΩ
R
3
:
20 kΩ
R
1
: 20 kΩ
R
2
: 20 kΩ
SBD
C
T
MB3771
1
2
3
4
8
7
6
5
RESET
V
CC
: 5 V
0.47 μF
R
5
: 3 kΩ
R
3
:
7.5 kΩR
1
: 300 kΩ
R
2
: 62 kΩ
R
4
:
1.2 kΩ
15 V
9 V (≅ 50 mA)
Document Number: 002-08511 Rev. *D Page 13 of 22
MB3771
8.10.2 5 V Reference Voltage Generation and 5V Monitoring (No.1)
Detection Voltage = 4.2 V
In the above examples, the output voltage and the detection voltage are determined by the following equations:
Output Voltage = (R3 + R4) × VSC/R4
8.10.3 5 V Reference Voltage Generation and 5 V Monitoring (No. 2)
The value of R1 should be calculated from the current consumption of the MB3771, the current flowing at R2 and R3, and the 5 V
output current. The table below provides sample resistance values for reference.
8.10.4 1.245 V Reference Voltage Generation and 5 V Monitoring
Resistor R1 determines Reference current. Using 1.2 kΩ as R1, reference current is about 2 mA.
VCC (V) R1 (kΩ) Output Current (mA)
40 11 < 1.6
24 6.2 < 1.4
15 4.7 < 0.6
C
T
MB3771
1
2
3
4
8
7
6
5
RESET
0.47 μF
R
5
: 3 kΩ
R
3
: 3.6 kΩ
R
4
: 1.2 kΩ
15 V
5 V(≅ 50 mA)
C
T
1
2
3
4
8
7
6
5
RESET
V
CC
0.47 μF
R
3
: 33 kΩ
R
1
R
2
:
100 kΩ
5 V
GND
CT
1
2
3
4
8
7
6
5
RESET
VCC
(5 V)
0.47 μF
R1 : 10 kΩ
GND
Reference
Voltage
Document Number: 002-08511 Rev. *D Page 14 of 22
MB3771
8.11 Low Voltage and Over Voltage Detection (VCC = 5 V)
VSH has no hysteresis. When over voltage is detected, RESET is held in the constant time as well as when
low voltage is detected.
VSL = (R1 + R2) × VSB/R2
VSH = (R3 + R4) × VSC/R4
8.12 Detection of Abnormal State of Power Supply System (VCC = 5 V)
■This Example circuit detects abnormal low/over voltage of power supply voltage and is indicated by LED
indicator. LED is reset by the CLEAR key.
■The detection levels of low/over voltages are determined by VSA, and R1 and R2 respectively.
C
T
1
2
3
4
8
7
6
5
RESET
V
CC
R
1
MB3771
R
2
R
3
R
4
RESET
V
CC
V
SL
V
SH
1
2
3
4
8
7
6
5
V
CC
R
1
MB3771 R
3
: 620 Ω
R
4
:
1 kΩ to 100 kΩ
CLEAR
R
2
LED
Document Number: 002-08511 Rev. *D Page 15 of 22
MB3771
8.13 Back-up Power Supply System (VCC = 5 V)
■Use CMOS Logic and connect VDD of CMOS logic with VCCO.
■The back-up battery works after CS goes high as V2 < V1.
■During tPO, memory access is prohibited.
■CS‘s threshold voltage V1 is determined by the following equation:
V1 = VF + (R1 + R2 + R3) × VSB/R3
When V1 is 4.45 V or less, connect 7 pin with VCC.
When V1 is 4.45 V or more, 7 pin can be used to open.
■The voltage to change V2 is provided as the following equation:
V2 = VF + (R1 + R2 + R3) × VSC/ (R2 + R3)
However, please set V2 to 3.5 V or more.
VCC
V1
V2
CS
VCCO
TPO
t
t
t
Document Number: 002-08511 Rev. *D Page 16 of 22
MB3771
1
2
3
4
8
7
6
5
VCC
MB3771
R3: 56 kΩ
CT
R 2: 6.2 kΩ
R 1: 100 kΩ
R4 >1 kΩ
R 5: 100 kΩ
R 6: 100 kΩ
VCCO
CS
D1
V F 0.6 V
* : Diode has been added to prevent Comp.C from malfunctioning when VCC voltage is low.
Set V1 and V2 with care given to VF temperature characteristics (typically negative temperature characteristics).
Document Number: 002-08511 Rev. *D Page 17 of 22
MB3771
9. Typical Characteristics
(Continued)
700
600
500
400
300
200
100
00 5 10 15 20
+85°C
+25°C
−40°C
+85°C
−40°C
+25°C
700
600
500
400
300
200
100
00 5 10 15 20
+85°C
+25°C
−40°C
5
4
3
2
1
001 23 45
Ta =
+25°C
−40°C
+85°C
4.0
−50 −25 0 +25 +50 +75 +100
4.1
4.2
4.3
4.4
4.5
VSAH
VSAL
1.20
−50 −25 0 +25 +50 +75 +100
1.25
1.30
VSBH
VSBL
1.20
−50 −25 0 +25 +50 +75 +100
1.25
1.30
−40°C
+25°C
Ta =
Ta =
+85°C
Power supply current ICC1
Power supply current (ICC1) vs.
power supply voltage
Detection voltage (VSC) vs.
Operating ambient temperature
Power supply current (ICC2) vs.
power supply voltage
Output voltage (RESET) vs. power supply voltage
Power supply voltage VCC (V)
Power supply voltage VCC (V)
Power supply voltage VCC (V)
Detection voltage VSC (V)
Detection voltage VSBH,VSBL
Power supply current ICC2
Output voltage VRESET (V)
Detection voltage VSAH,VSAL
Operating ambient temperature Ta (°C)
Detection voltage (VSB) vs.
Operating ambient temperature
Operating ambient temperature Ta (°C)
Detection voltage (VSA) vs.
Operating ambient temperature
Operating ambient temperature Ta (°C)
Document Number: 002-08511 Rev. *D Page 18 of 22
MB3771
(Continued)
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.20
0 5 10 15 20
0 5 10 15 20
0102030 5040
0− 5−10 −15
5.0
4.5
4.0
1.5
1.0
0.5
0
2.0
1.0
0
1.0
0.5
0
10
1
100 m
10 m
1 m
100
μ
10
μ
1
μ
10 p
100 p 1000 p
0.01
μ
1 p 0.1
μ
1
μ
10
μ
100
μ
0 5 10 15 20
V
SBH
V
SC
V
SBL
Ta =
+85°C
+25°C
Ta =
− 40°C
Ta =
+85°C
+85°C
+25°C
− 40°C
Ta =
− 40°C
− 40°C
− 40°C
+25°C
+85°C
Ta =
+25°C
+85°C
+25°C
Power supply voltage VCC (V)
Power supply voltage VCC (V)
Output current IRESET (μA)
Output voltage (VOHR) vs. output current
Detection voltage (VSB, VSC) vs. Power supply voltage
Output voltage (VOLR) vs. output sink current
Output sink current IRESET (mA)
Output sink current IOUTC (mA)
Output voltage (VOLC) vs.
output sink current
Output voltage VOHR
Output voltage VOLR
Output voltage VOLC
Detection voltage VSC, VSBL,VSBH
Reset hold time (tPO) vs.
power supply voltage (CT = 0.01μF)
Reset hold time (tPO) vs. CT pin capacitance
Reset hold time tPO (ms)
Reset hold time tPO (s)
CT pin capacitance (F)
Document Number: 002-08511 Rev. *D Page 19 of 22
MB3771
10. Notes on Use
■Take account of common impedance when designing the earth line on a printed wiring board.
■Take measures against static electricity.
• For semiconductors, use antistatic or conductive containers.
• When storing or carrying a printed circuit board after chip mounting, put it in a conductive bag or container.
• The work table, tools and measuring instruments must be grounded.
• The worker must put on a grounding device containing 250 kΩ to 1 MΩ resistors in series.
■Do not apply a negative voltage
• Applying a negative voltage of −0.3 V or less to an LSI may generate a parasitic transistor, resulting in
malfunction.
11. Ordering Information
12. RoHS Compliance Information
The LSI products of Cypress with “E1” are compliant with RoHS Directive , and has observed the standard of lead, cadmium, mercury,
Hexavalent chromium, polybrominated biphenyls (PBB) , and polybrominated diphenyl ethers (PBDE) .
The product that conforms to this standard is added “E1” at the end of the part number.
Part Number Package Remarks
MB3771PF-❏❏❏E1 8-pin Plastic SOP
(SOE008) –
Document Number: 002-08511 Rev. *D Page 20 of 22
MB3771
13. Package Dimensions
$//',0(16,216$5(,10,//,0(7(5
',0(16,21,1*$1'72/(5$1&,1*3(5$60(<0
',0(16,21,1*',1&/8'(02/')/$6+',0(16,21,1*('2(6127,1&/8'(
,17(5/($')/$6+253527586,21,17(5/($')/$6+253527586,216
6+$//127(;&(('PP3(56,'('DQG(',0(16,21$5('(7(50,1('
$7'$780+
7+(3$&.$*(7230$<%(60$//(57+$17+(3$&.$*(%27720
',0(16,21,1*'DQG($5('(7(50,1('$77+(287(50267
(;75(0(62)7+(3/$67,&%2'<(;&/86,9(2)02/')/$6+
7+(%$5%8556*$7(%8556$1',17(5/($')/$6+%87,1&/8',1*
$1<0,60$7&+%(7:((17+(723$1'%277202)7+(3/$67,&%2'<
'$7806$%72%('(7(50,1('$7'$780+
1,67+(0$;,080180%(52)7(50,1$/326,7,216)257+(63(&,),('
3$&.$*(/(1*7+
7+(',0(16,21$33/<727+()/$76(&7,212)7+(/($'%(7:((1PP
72PP)5207+(/($'7,3
',0(16,21E'2(6127,1&/8'(7+('$0%$53527586,21$//2:$%/(
'$0%$53527586,216+$//%(PP727$/,1(;&(662)7+(E',0(16,21
$70$;,0800$7(5,$/&21',7,21
7+('$0%$50$<127%(/2&$7('217+(/2:(55$',862)7+()227
7+,6&+$0)(5)($785(,6237,21$//),7,612735(6(177+(1$3,1
,'(17,),(50867%(/2&$7(':,7+,17+(,1'(;$5($,1',&$7('
$,6'(),1('$67+(9(57,&$/',67$1&()5207+(6($7,1*3/$1(72
7+(/2:(6732,17217+(3$&.$*(%2'<(;&/8',1*7+(/,'$1'25
7+(50$/(1+$1&(0(1721&$9,7<'2:13$&.$*(&21),*85$7,216
127(6
L11.25 REF
L
c
0.45
0.13
0.60 0.75
0.20
NOM.MIN.
7.80 BSC
E
0°
D
A
1A
6.35 BSC
0.05
SYMBOL
MAX.
8°
2.25
0.20
ș
E15.30 BSC
b0.39 0.47 0.55
e1.27 BSC
DIMENSION
L20.25 BSC
11. JEDEC SPECIFICATION NO. REF : N/A
D
4
5
E1 E
0.40 CA-B D
A
A1
10
DETAIL A
e0.10 C
SEATING
PLANE
b0.13 CA-B D8
SIDE VIEW
TOP VIEW
b
SECTION A-A'
c
L1
L
GAUGE
PLANE
DETAIL A
L2
șA
A'
0.25 H D
;
0.25 H D
㻭㻰
㻯
4
5
INDEX AREA
;
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BOTTOM VIEW
002-15857 Rev. **
Package Code: SOE008
Document Number: 002-08511 Rev. *D Page 21 of 22
MB3771
Document History
Spansion Publication Number: DS04-27400-11Ea
Document Title: MB3771 Power Supply Monitor
Document Number: 002-08511
Revision ECN Orig. of
Change
Submission
Date Description of Change
** –TAOA 05/12/2006 Migrated to Cypress and assigned document number 002-08511.
No change to document contents or format.
*A 5177314 TAOA 03/16/2016 Updated to Cypress format.
*B 5550024 HIXT 12/12/2016
Updated Pin Assignment: Change the package name from FPT-8P-M01 to SOE008
Updated Ordering Information: Change the package name from FPT-8P-M01 to SOE008
Updated Package Dimensions: Updated to Cypress format
Deleted Marking Format (Lead Free version)
Deleted Labeling Sample (Lead free version)
Deleted MB3771PF-❏❏❏E1 Recommended Conditions of Moisture Sensitivity Level
*C 5606248 HIXT 01/31/2017 Deleted the part number, “MB3771PF-❏❏❏”, from Ordering Information
Deleted the words in the Remarks, “Lead Free version”, from Ordering Information
*D 5788467 MASG 06/28/2017 Adapted Cypress new logo.
Document Number: 002-08511 Rev. *D Revised June 28, 2017 Page 22 of 22
© Cypress Semiconductor Corporation, 2003-2017. This document is the property of Cypress Semiconductor Corporation and its subsidiaries, including Spansion LLC (“Cypress”). This document,
including any software or firmware included or referenced in this document (“Software”), is owned by Cypress under the intellectual property laws and treaties of the United States and other countries
worldwide. Cypress reserves all rights under such laws and treaties and does not, except as specifically stated in this paragraph, grant any license under its patents, copyrights, trademarks, or other
intellectual property rights. If the Software is not accompanied by a license agreement and you do not otherwise have a written agreement with Cypress governing the use of the Software, then Cypress
hereby grants you a personal, non-exclusive, nontransferable license (without the right to sublicense) (1) under its copyright rights in the Software (a) for Software provided in source code form, to
modify and reproduce the Software solely for use with Cypress hardware products, only internally within your organization, and (b) to distribute the Software in binary code form externally to end users
(either directly or indirectly through resellers and distributors), solely for use on Cypress hardware product units, and (2) under those claims of Cypress’s patents that are infringed by the Software (as
provided by Cypress, unmodified) to make, use, distribute, and import the Software solely for use with Cypress hardware products. Any other use, reproduction, modification, translation, or compilation
of the Software is prohibited.
TO THE EXTENT PERMITTED BY APPLICABLE LAW, CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS DOCUMENT OR ANY SOFTWARE
OR ACCOMPANYING HARDWARE, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. To the extent
permitted by applicable law, Cypress reserves the right to make changes to this document without further notice. Cypress does not assume any liability arising out of the application or use of any
product or circuit described in this document. Any information provided in this document, including any sample design information or programming code, is provided only for reference purposes. It is
the responsibility of the user of this document to properly design, program, and test the functionality and safety of any application made of this information and any resulting product. Cypress products
are not designed, intended, or authorized for use as critical components in systems designed or intended for the operation of weapons, weapons systems, nuclear installations, life-support devices or
systems, other medical devices or systems (including resuscitation equipment and surgical implants), pollution control or hazardous substances management, or other uses where the failure of the
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Cypress, the Cypress logo, Spansion, the Spansion logo, and combinations thereof, WICED, PSoC, CapSense, EZ-USB, F-RAM, and Traveo are trademarks or registered trademarks of Cypress in
the United States and other countries. For a more complete list of Cypress trademarks, visit cypress.com. Other names and brands may be claimed as property of their respective owners.
MB3771
Sales, Solutions, and Legal Information
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