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Supervisory Circuit
12-07-0002 PT0195-3 0705/12
1
PT7M1233/1233A
Features
High accurate: 1.5% (25°C)
Operating voltage range: 1.0V ~ 5.5V
Operating temperature range: -40°C to + 85°C
Detect voltage temperature characteristics: 2.5%
TYP
Output configuration: Bi-dir
Reset timeout period: typical 200ms
Description
The PT7M1233/1233A series are designed to monitor
power supplies in µP and digital systems. They
provide excellent circuit reliability and low cost by
eliminating external components and adjustments.
The devices perform a single function: assert a reset
signal whenever the VCC supply voltage falls below a
preset threshold. Reset remains asserted 200ms after
VCC has risen above the reset threshold.
PT7M1233/1233A are bidirectional output, allowing it
to monitor a pushbutton on the reset output.
Pin Configuration
Pin Description
Name
Type
Description
I/O
Reset Output and Pushbutton Input: RST is asserted when VCC drops below voltage threshold VTH-. Active
low. When other devices pull RST low, the reset condition occurs and will remain a reset timeout period at
least 200ms.
GND
P
Ground
VCC
P
Supply Voltage.
PT7M1233/1233A
1
VCC GND
2 3
RST
TO-92
RST
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12-07-0002 PT0195-3 0705/12
2
PT7M1233/1233A
Supervisory Circuit
Maximum Ratings
Storage Temperature ............................................................-65oC to +150oC
Ambient Temperature with Power Applied .......................... -40oC to +85oC
Supply Voltage to Ground Potential (Vcc to GND) ..............-0.3V to +7.0V
DC Input Voltage (All inputs except Vcc and GND)......-0.3V to VCC+0.3V
DC Output Current (All outputs) ..........................................................30mA
Power Dissipation .......................................... 320mW (Depend on package)
DC Electrical Characteristics
(TA= -40~85ºC, unless otherwise noted. Typical values are at TA = +25ºC)
Description
Test Conditions
Min
Typ
Max
Unit
Supply Voltage
1.0
-
5.5
V
Supply Current
VCC = 5.5V. No load.
-
-
12
µA
VCC = 3.6V. No load.
-
-
10
µA
Voltage Threshold
+25C
(VTH-)
0.985
VTH-
(VTH-)
1.015
V
-40C~85C
(VTH-)
0.975
VTH-
(VTH-)
1.025
V
Voltage Threshold
(PT7M1233A-10)
+25C
(VTH-)
0.985
2.88
(VTH-)
1.015
V
-40C~85C
(VTH-)
0.975
2.88
(VTH-)
1.025
V
Voltage Threshold
(PT7M1233A-15)
+25C
(VTH-)
0.985
2.72
(VTH-)
1.015
V
-40C~85C
(VTH-)
0.975
2.72
(VTH-)
1.025
V
Hysteresis
VTH+ - VTH-*
-
50
-
mV
Output
Driving
Output low
IOH = 8mA, VCC = 5V
-
-
0.4
V
IOH = 4mA, VCC = 3V
-
-
0.3
IOH = -50µA, VCC = 1V
-
-
0.09
Note: VTH- is voltage threshold when VCC falls from high to low. VTH+ is voltage threshold when VCC rises from low to high.
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
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12-07-0002 PT0195-3 0705/12
3
PT7M1233/1233A
Supervisory Circuit
AC Electrical Characteristics
Timing diagram
(VCC = 1.0V to 5.5V, TA= -40~85ºC, unless otherwise noted. Typical values are at TA = +25ºC)
Sym.
Description
Test Conditions
Min
Typ
Max
Unit
tRS
Reset Timeout Period
-
140
200
280
ms
tRPD
Delay
-
-
17
-
s
tSEN
Sensitivity
-
20
-
-
s
tPD
External Pull Down Signal Pulse
RST pin
1
-
-
s
Pushbutton Debounce
RST pin
140
200
280
ms
Pushbutton Detect*
RST pin
0.8
1.5
2.0
V
*Note: RST will be asserted when it is pull down to the typical value or less.
VCC VRST
1V
0V
tRS
tSEN
tRS
tRPD
1V
0V
RST
VCC VRST
1V
0V
tRS
1V
0V
Uncertain state
0.8V
tPD tRS
External pull down
signal release
0.8VCC
RST
Note: If tPD < tRS, the reset pulse width will be tRS; if tPD > tRS, the width will be tPD + tRS.
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12-07-0002 PT0195-3 0705/12
4
PT7M1233/1233A
Supervisory Circuit
Block Diagram
Function Description
Power Monitor
A microprocessor’s (µP’s) reset input starts the µP in a known state. Whenever the µP is in an unknown state, it should be held in
reset. The supervisory circuits assert reset during power-up and prevent code execution errors during power-down or brownout
conditions.
On power-up, once Vcc reaches about 1.0V, RST is a guaranteed logic low of 0.4V or less. As Vcc rises, RST stays low. When
Vcc rises above the reset threshold VRST, an internal timer releases RST after about 200ms. RST asserts whenever Vcc drops
below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse, the pulse
continues for at least another 200ms. On power-down, once Vcc falls below the reset threshold, RST stays low and is guaranteed
to be 0.4V or less until Vcc drops below 1V.
Reset Output: Bi-direction
PT7M1233
The devices provide RST output pin for a pushbutton switch. When the devices are not in a reset cycle, it continuously monitors
the RST signal for a low going edge. If an edge is detected, the devices will debounce the switch by pulling the RST line low.
After the internal timer has expired, the devices will continue to monitor the RST line. If the line is still low, they will continue to
monitor the line looking for a rising edge. Upon detecting a release, they will force the RST line low and hold it low for 200ms.
PT7M1233A
When an out-of-tolerance condition is detected, an internal power fail signal is generated which forces reset to the active state.
When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 200ms to allow the
power supply and processor to stabilize. The second function of the PT7M1233A is pushbutton reset control. The PT7M1233A
debounces a pushbutton closure and will generate a 200ms reset pulse upon release.
T.C.
Reference
Reset
Monitor
Timing
Delay
Vcc
GND
5k
RST
VCC Resistor
Divider
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12-07-0002 PT0195-3 0705/12
5
PT7M1233/1233A
Supervisory Circuit
Application Information
Typical Operation Circuit
PT7M1233 Application Example
PT7M1233/1233A RST
Vcc
RESET
MICROPROCESSOR
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12-07-0002 PT0195-3 0705/12
6
PT7M1233/1233A
Supervisory Circuit
Mechanical Information
NB (TO92-3)
SYMBOL MIN MAX
A 3.3 3.7
A1 1.1 1.4
b 0.38 0.55
c 0.36 0.51
D 4.30 4.70
D1 3.43
E 4.30 4.70
e
e1 2.44 2.64
F1
F2
L12 13
L1 9.00 10.00
φ1.6
h 0.00 0.38
PKG. DIMENSIONS(MM)
1.27TYP
2.50TYP
2.50TYP
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12-07-0002 PT0195-3 0705/12
7
PT7M1233/1233A
Supervisory Circuit
TC (SOT223-3)
SYMBOL MIN MAX
A 1.52 1.8
A1 0 0.1
A2 1.5 1.7
b 0.66 0.82
c 0.25 0.35
D 6.2 6.4
D1 2.9 3.1
E 3.3 3.7
E1 6.83 7.07
e
e1 4.5 4.7
L 0.9 1.15
θ0° 10°
PKG. DIMENSIONS(MM)
2.30BSC
Note:
1) Controlling dimensions in millimeters.
2) Ref: JEDEC TO-261C
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12-07-0002 PT0195-3 0705/12
8
PT7M1233/1233A
Supervisory Circuit
Ordering Information
Part Number
Package Code
Package
PT7M1233-15NBE
NB
Lead free TO92
PT7M1233-10NBE
NB
Lead free TO92
PT7M1233-5NBE
NB
Lead free TO92
PT7M1233-15TCE
TC
Lead free and Green SOT223
PT7M1233-10TCE
TC
Lead free and Green SOT223
PT7M1233-5TCE
TC
Lead free and Green SOT223
PT7M1233A-15NBE
NB
Lead free TO92
PT7M1233A-10NBE
NB
Lead free TO92
PT7M1233A-15TCE
TC
Lead free and Green SOT223
PT7M1233A-10TCE
TC
Lead free and Green SOT223
Note:
E = Pb-free or Pb-free and Green
Adding X Suffix= Tape/Reel
Contact Pericom for availability.
Function Comparison Table
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply
the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The
company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.
Item
Part No.
Reset Output
Threshold
1
PT7M1233-15
Bi-direct, Active low
4.1V
2
PT7M1233-10
Bi-direct, Active low
4.3V
3
PT7M1233-5
Bi-direct, Active low
4.6V
4
PT7M1233A-15
Bi-direct, Active low
2.72V
5
PT7M1233A-10
Bi-direct, Active low
2.88V