FUJITSU SEMICONDUCTOR DATA SHEET DS04-27400-7E ASSP For power supply applications BIPOLAR Power Supply Monitor MB3771 DESCRIPTION The Fujitsu 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 hysterisis (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. PACKAGES 8-pin plastic DIP 8-pin plastic SIP 8-pin plastic SOIP (DIP-8P-M01) (SIP-8P-M03) (FPT-8P-M01) MB3771 PIN ASSIGNMENT (FRONT VIEW) (TOP VIEW) 8 RESET 7 VSA CT 1 8 RESET 6 VSB / RESIN VSC 2 7 VSA 5 VCC OUTC 3 6 VSB /RESIN 4 GND GND 4 5 VCC 3 OUTC 2 VSC 1 CT (DIP-8P-M01) (FPT-8P-M01) (SIP-8P-M03) BLOCK DIAGRAM VCC 5 1.24 V 100 k + + - Comp. A VSA 7 - 10 A - + 2 VSC 4 GND + Comp. C + - 12 A - 40 k VSB / RESIN 6 1.24 V REFERENCE VOLTAGE R Q Comp. B S 1 CT 2 8 3 RESET OUTC MB3771 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(Sample Application 3), and can also be used as a forced reset pin (with reset hold time) with TTL input (Sample Application 6). Note that if Comp.B is not used, the VSB pin should be connected to the VCC pin (Sample Application 1). Instantaneous breaks or drops in the power supply can be detected as abnormal conditions by the MB3771 within a 2 s 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 (Sample Application 8). 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 (Sample Application 11) and positive logic RESET signal output (Sample Application 7), as well as for creating a reference voltage (Sample Application 10). Note that if Comp. C is not used, the VSC pin should be connected to the GND pin (Sample Application 1). FUNCTION EXPLANATION VHYS VS VCC 0.8 V VCC CT 1 2 3 4 8 7 6 5 t RESET TPO RESET TPO t (1) (2) (3) (4) (5) (6) (7) (8) (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 x 10 5 (Refer to CT pin capacitance vs. hold time ) (4) When VCC level dropps 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 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. 3 MB3771 ABSOLUTE MAXIMUM RATINGS Parameter Rating Symbol Power supply voltage Input voltage Power dissipation Storage temperature Unit Min. Max. VCC -0.3 +20 V VSA -0.3 VCC + 0.3 ( < +20) V VSB -0.3 +20 V VSC -0.3 +20 V PD 200 (Ta 85 C) mW Tstg -55 +125 C 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. RECOMMENDED OPERATING CONDITIONS Parameter Power supply voltage Output current Operating ambient temperature Symbol Value Unit Min. Max. VCC 3.5 18 V IRESET 0 20 mA IOUTC 0 6 mA Top -40 +85 C 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 FUJITSU representatives beforehand. 4 MB3771 ELECTRICAL CHARACTERISTICS 1. DC Characteristics Parameter Power supply current (VCC = 5 V, Ta = + 25 C) Symbol Typ. Max. Unit 350 500 A ICC2 VSB = 0 V, VSC = 0 V 400 600 A VCC 4.10 4.20 4.30 V Ta = -40 C to +85 C 4.05 4.20 4.35 V VCC 4.20 4.30 4.40 V Ta = -40 C to +85 C 4.15 4.30 4.45 V 50 100 150 mV VSB 1.212 1.230 1.248 V Ta = -40 C to +85 C 1.200 1.230 1.260 V 3 10 mV 14 28 42 mV VSAH (UP) VHYSA VSB Deviation of detection voltage VSB Hysterisis width VHYSB Input current Min. VSB = 5 V, VSC = 0 V Detection voltage Detection voltage Value ICC1 VSAL (DOWN) Hysterisis width Conditions VCC = 3.5 V to 18 V IIHB VSB = 5 V 0 250 nA IILB VSB = 0 V 20 250 nA IRESET = -5 A, VSB = 5 V 4.5 4.9 V IRESET = 3mA, VSB = 0 V 0.28 0.4 V IRESET = 10mA, VSB = 0 V 0.38 0.5 V "H" level output voltage VOHR Output saturation voltage VOLR 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 A IIHC VSC = 5 V 0 500 nA IILC VSC = 0 V 50 500 nA 1.225 1.245 1.265 V 1.205 1.245 1.285 V Input current Detection voltage VSC Ta = -40 C to +85 C Deviation of detection voltage VSC VCC = 3.5 V to 18 V 3 10 mV Output leakage current IOHC VOHC = 18 V 0 1 A Output saturation 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 A 0.8 1.2 V 5 MB3771 2. AC Characteristics (VCC = 5 V, Ta = + 25 C, CT = 0.01 F) Symbol Conditions VSA, VSB input pulse width tPI RESET output pulse width tPO Parameter RESET rise time tr RESET fall time tf Propagation delay time PHL 2 t * PLH 2 t *1: In case of VSB termination. *2: In case of VSC termination. 6 Typ. Max. 5.0 s 0.5 1.0 1.5 ms 1.0 1.5 s 0.1 0.5 s 2 10 s 0.5 s 1.0 s * RL = 2.2 k, CL = 100 pF Unit Min. RL = 2.2 k, CL = 100 pF tPD*1 Value MB3771 APPLICATION CIRCUIT 1. 5V Power Supply Monitor Monitored by VSA. Detection threshold voltage is VSAL and VSAH VCC MB3771 CT 1 8 2 3 4 7 6 5 RESET Logic circuit 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. (See the table below). * R1, R2 calculation formula (when R1 << 100 k, R2 <<40 k) VSAL =: (R1 + R2 ) x VSB /R2 [V], VSAH =: (R1 + R2 ) x (VSB + VHYSB) / R2 [V] R1 (k) R2 (k) Detection voltage : VSAL (V) Detection voltage : VSAH (V) 10 3.9 4.37 4.47 9.1 3.9 4.11 4.20 VCC MB3771 CT 1 2 3 4 8 7 6 5 RESET R1 R2 Logic Circuit 7 MB3771 3. Arbitrary Voltage Supply Monitor (1) Case: VCC 18 V * Detection Voltage can be set by R1 and R2. Detection Voltage = (R1 + R2) x 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). VCC MB3771 1 2 3 4 CT 8 7 6 5 RESET R1 R2 (2) Monitoring VCC > 18 V * Detection Voltage can be set by R1 and R2 Detection Voltage = (R1 + R2) x 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 resistance). VCC (V) Detection voltage (V) RESET Output min. power supply voltage (V) R1 (M) R2 (k) R3 (k) 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 Output Current (mA) * Values are actual measured values (using IOUTC = 100 A, 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 R3 5 V output(Stablized) CT R4: 100 k R5: 33 k 8 0.47 F 1 8 2 7 3 6 4 5 RESET R1 R2 MB3771 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 k and R2 = 62 k, Detection voltage is about 9.0 V.Generally the detection voltage is determined by the following equation. Detection Voltage = (R1 + R2) x VSB/R2 VCC2 VCC1 MB3771 CT 1 2 3 4 8 7 6 5 RESET R1: 390 k Logic circuit R2: 62 k 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 hysterisis is determined by the following equations. R1 + R2 + R3 Detection voltage = x VSC (8.95 V in the circuit above) R2 + R3 Hysterisis width = R1 (R3 - R3 // R4) (R2 + R3) (R2 + R3 // R4) x VSC (200 mV in the circuit above) VCC2 VCC1 R L: 10 k MB3771 R5: 100 k R1: 390 k 1 2 3 4 R2: 33 k R4: 510 k 8 7 6 5 RESET IRQ or Port Logic Circuit CT R3: 30 k 9 MB3771 6. 5 V Power Supply Monitor with forced RESET input (VCC = 5 V) RESIN is an TTL compatible input. RESIN VCC MB3771 CT 1 8 2 7 3 4 6 5 RESET Logic Circuit 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. VCC MB3771 RL: 10 k 1 2 3 4 CT RESET 8 7 6 5 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 s (when C1 = 1000 pF). The formula for calculating the minimum value of the input pulse width [TPI] is: TPI [s] =: 4 x 10-2 x C1 [pF] TP VCC 5V 4V MB3771 CT 10 1 2 3 4 8 7 6 5 RESET C1 MB3771 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 x R4/R3 Example if VEE = -5 V, R4 = 91 k 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). VCC R5 : 5.1 k MB3771 R4 VEE R3 : 20 k 0.22 F CT SBD 1 8 2 7 3 6 4 5 RESET R1 : 20 k R2 : 20 k 10. Reference Voltage Generation and Voltage Sagging Detection (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) x VSB/R2 15 V R 5 : 3 k V CC : 5 V MB3771 CT 0.47 F 1 2 3 4 8 7 6 5 RESET R3 : 7.5 k R4 : 1.2 k 9 V ( 50 mA) R 1: 300 k R 2: 62 k 11 MB3771 (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) x VSC/R4 15 V R5 : 3 k MB3771 CT 0.47 F 8 7 6 5 1 2 3 4 RESET 5 V( 50 mA) R3 : 3.6 k R4 : 1.2 k (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. VCC (V) R1 (k) Output Current (mA) 40 11 < 1.6 24 6.2 < 1.4 15 4.7 < 0.6 VCC R1 CT 1 8 2 7 3 4 6 5 RESET 5V R2 : 100 k 0.47 F R3 : 33 k GND (4) 1.245 V Reference Voltage Generation and 5 V Monitoring Resistor R1 determines Reference current. Using 1.2 k as R1, reference current is about 2 mA. VCC (5 V) R1 : 10 k CT 0.47 F GND 12 1 8 2 7 3 4 6 5 RESET Reference Voltage 1.245V typ. MB3771 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) x VSB/R2 VSH = (R3 + R4) x VSC/R4 VCC R3 R1 MB3771 RESET R4 1 2 3 4 CT 8 7 6 5 RESET R2 VSL VSH VCC 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. VCC LED R1 R3: 620 MB3771 R2 1 2 3 4 8 7 6 5 CLEAR R4: 1 k to 100 k 13 MB3771 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) x 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) x VSC/ (R2 + R3) However, please set V2 to 3.5 V or more. VCC V1 V2 t CS TPO t VCCO t VCC MB3771 CT 1 2 D1 V F 0.6 V R4 >1 k R 1: 100 k R 5: 100 k R 2: 6.2 k 3 8 7 6 4 5 R 6: 100 k VCCO CS R3: 56 k *: Diode has been added to prevent Comp.C from malfunctionig when VCC voltage is low. Set V1 and V2 with care given to VF temperature characteristics (typically negative temperature characteristics). 14 MB3771 TYPICAL CHARACTERISTICS Detection voltage VSC (V) 700 600 500 400 25C -40C 300 -40C 85C 200 25C 100 0 85C 0 5 10 15 Power supply voltage VCC (V) 600 85C 25C 400 -40C 300 -40C 200 25C 100 0 85C 0 5 10 15 1.25 -25 0 25 50 75 100 Anbient temperature Ta (C) 700 500 1.30 1.20 - 50 20 Power supply current vs. power supply voltage Power supply current ICC2 (A) Detection voltage (VSC) vs. anbient temperature 20 Power supply voltage VCC (V) Detection voltage (VSB) vs. anbient temperature Detection voltage VSBH,VSBL (V) Power supply current ICC1 (A) Power supply current vs. power supply voltage 1.30 VSBH 1.25 VSBL 1.20 -50 -25 0 25 50 75 100 Anbient temperature Ta (C) Output voltage VOLR (V) 5 4 3 2 1 Ta= 25C 0 85C 0 -40C 1 2 3 4 Power supply voltage VCC (V) 5 Detection voltage VSAH,VSAL (V) Output (RESET) voltage vs. power supply voltage Detection voltage (VSA) vs. anbient temperature 4.5 4.4 VSAH 4.3 VSAL 4.2 4.1 4.0 -50 -25 0 25 50 75 100 Anbient temperature Ta (C) (Continued) 15 MB3771 (Continued) Reset voltage (RESET) vs. output current 1.27 5.0 VSBH 1.26 Reset voltage VOHR (V) Detection voltage VSC, VSBL,VSBH (V) Detection voltage (VSB, VSC) vs. Power supply voltage VSC 1.25 1.24 VSBL 1.23 1.22 1.21 1.20 0 5 10 15 20 Ta = - 40C 25C 4.0 Output voltage VOLR (V) Ta = - 40C 25C 85C 0.5 0 0 5 10 15 Ta = - 40C 85C 1.0 25C 0 20 0 1.0 Ta = 25C - 40C 85C 10 1 1 p 10 p 100 p 1000 p 0.01 0.1 1 10 100 CT pin capacitance CT (F) 16 Output voltage VOLC (V) Reset hold time (s) 10 100 m 20 30 40 50 Output voltage (OUTC) vs. output current CT pin capacitance vs. reset hold time 1 10 Output current IRESET (mA) Power supply voltage VCC (V) 100 -15 Output (RESET) voltage vs. output current 2.0 1.0 1m -10 Output current IOH (A) 1.5 10 m -5 0 Power supply voltage VCC (V) Reset hold time vs. power supply voltage (CT = 0.01F) Reset hold time tPO (ms) 85C 4.5 Ta = - 40C 25C 85C 0.5 0 0 5 10 15 Output current IOUTC (mA) 20 MB3771 ORDERING INFORMATION Part number Package MB3771P 8-pin Plastic DIP (DIP-8P-M01) MB3771PS 8-pin Plastic SIP (SIP-8P-M03) MB3771PF 8-pin Plastic SOP (FPT-8P-M01) Remarks 17 MB3771 PACKAGE DIMENSIONS 8-pin Plastic DIP (DIP-8P-M01) +0.40 9.40 -0.30 +.016 .370 -.012 6.200.25 (.244.010) 1 PIN INDEX 0.51(.020)MIN 4.36(.172)MAX 0.250.05 (.010.002) 3.00(.118)MIN 0.460.08 (.018.003) +0.30 0.99 -0 +.012 .039 -0 +0.35 0.89 -0.30 +.014 .035 -.012 C 1994 FUJITSU LIMITED D08006S-2C-3 +0.30 1.52 -0 +.012 .060 -0 7.62(.300) TYP 15MAX 2.54(.100) TYP Dimensions in mm (inches) (Continued) 18 MB3771 (Continued) 8-pin Plastic SIP (SIP-8P-M03) 3.260.25 (.128.010) +0.15 19.65 -0.35 +.006 .774 -.014 INDEX-1 6.200.25 (.244.010) 8.200.30 (.323.012) INDEX-2 +0.30 0.99 -0 4.000.30 (.157.012) +.012 .039 -0 +0.30 1.52 -0 2.54(.100) TYP C 0.250.05 (.010.002) 0.500.08 (.020.003) +.012 .060 -0 Dimensions in mm (inches) 1994 FUJITSU LIMITED S08010S-3C-2 8-pin Plastic SOP (FPT-8P-M01) +0.25 2.25(.089)MAX (Mounting height) +.010 6.35 -0.20 .250 -.008 0.05(.002)MIN (STAND OFF) 5.300.30 (.209.012) INDEX 1.27(.050) TYP 0.450.10 (.018.004) 3.81(.150)REF +0.40 6.80 -0.20 7.800.40 (.307.016) +.016 .268 -.008 +0.05 O0.13(.005) M 0.15 -0.02 +.002 .006 -.001 0.500.20 (.020.008) Details of "A" part 0.20(.008) 0.50(.020) "A" 0.18(.007)MAX 0.10(.004) C 1994 FUJITSU LIMITED F08002S-4C-4 0.68(.027)MAX Dimensions in mm (inches) 19 MB3771 FUJITSU LIMITED For further information please contact: Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa 211-8588, Japan Tel: +81-44-754-3763 Fax: +81-44-754-3329 http://www.fujitsu.co.jp/ North and South America FUJITSU MICROELECTRONICS, INC. 3545 North First Street, San Jose, CA 95134-1804, USA Tel: +1-408-922-9000 Fax: +1-408-922-9179 Customer Response Center Mon. - Fri.: 7 am - 5 pm (PST) Tel: +1-800-866-8608 Fax: +1-408-922-9179 http://www.fujitsumicro.com/ Europe FUJITSU MICROELECTRONICS EUROPE GmbH Am Siebenstein 6-10, D-63303 Dreieich-Buchschlag, Germany Tel: +49-6103-690-0 Fax: +49-6103-690-122 http://www.fujitsu-fme.com/ Asia Pacific FUJITSU MICROELECTRONICS ASIA PTE LTD #05-08, 151 Lorong Chuan, New Tech Park, Singapore 556741 Tel: +65-281-0770 Fax: +65-281-0220 http://www.fmap.com.sg/ F0001 FUJITSU LIMITED Printed in Japan All Rights Reserved. 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