FUJITSU SEMICONDUCTOR DATA SHEET DS04-27404-2E ASSP For Power Supply Applications BIPOLAR Power Voltage Monitoring IC with Watchdog Timer MB3793-27A DESCRIPTION The MB3793 is an integrated circuit to monitor power voltage; it incorporates a watchdog timer. A reset signal is output when the power is cut or falls abruptly. When the power recovers normally after resetting, a power-on reset signal is output to microprocessor units (MPUs). An internal watchdog timer with two inputs for system operation diagnosis can provide a fall-safe function for various application systems. There is also a mask option that can detect voltages of 4.9 to 2.4 V in 0.1-V steps. FEATURES * * * * * * Precise detection of power voltage fall: 2.5% Detection voltage with hysteresis Low power dispersion: ICC = 31 A (reference) Internal dual-input watchdog timer Watchdog-timer halt function (by inhibition pin) Independently-set wacthdog and reset times PACKAGE 8-pin, Plastic SOP 8-pin, Plastic SOP (FPT-8P-M01) (FPT-8P-M02) 8-pin, Plastic SSOP 8-pin, Plastic DIP (FPT-8P-M03) (DIT-8P-M01) MB3793-27A PIN ASSIGNMENT (TOP VIEW) RESET 1 8 CK1 CTW 2 7 CK2 CTP 3 6 INH GND 4 5 VCC (FPT-8P-M01) (FPT-8P-M02) (FPT-8P-M03) (DIP-8P-M01) PIN DESCRIPTION 2 Pin no. Symbol 1 RESET 2 Descriptions Pin no. Symbol Descriptions Outputs reset pin 5 VCC Power supply pin CTW Watchdog timer monitor time setting pin 6 INH Inhibit pin 3 CTP Power-on reset hold time setting pin 7 CK2 Inputs clock 2 pin 4 GND Ground pin 8 CK1 Inputs clock 1 pin MB3793-27A BLOCK DIAGRAM To VCC of all blocks . 3 A I1 = . 5 VCC I2 .=. 30 A CTP 3 . R1 = . 295 k Logic circuit RESET 1 Output circuit INH 6 Comp.S CTW 2 Watchdog timer Reference voltage generator - VS + Pulse generator 1 . 1.24 V VREF = . CK1 8 R2 .=. 240 k Pulse generator 2 CK2 7 To GND of all blocks 4 GND 3 MB3793-27A BLOCK DESCRIPTION 1. Comp. S Comp. S is a comparator with hysteresis to compare the reference voltage with a voltage (VS) that is the result of dividing the power voltage (VCC) by resistors 1 and 2. When VS falls below 1.24 V, a reset signal is output. This function enables the MB3793 to detect an abnomality within 1 s when the power is cut or falls abruptly. 2. Output circuit The output circuit contains a RESET output control comparator that compares the voltage at the CTP pin to the threshold voltage to release the RESET output if the CTP pin voltage exceeds the threshold value. Since the reset (RESET) output buffer has CMOS organization, no pull-up resistor is needed. 3. Pulse generator The pulse generator generates pulses when the voltage at the CK1 and CK2 clock pins changes to High from Low level (positive-edge trigger) and exceeds the threshold voltage; it sends the clock signal to the watchdog timer. 4. Watchdog timer The watchdog timer can monitor two clock pulses. Short-circuit the CK1 and CK2 clock pins to monitor a single clock pulse. 5. Inhibition pin The inhibition (INH) pin forces the watchdog timer on/off. When this pin is High level, the watchdog timer is stopped. 6. Logic circuit The logic circuit contains flip-flops. Flip-flop RSFF1 controls the charging and discharging of the power-on reset time setting capacitor (CTP). Flip-flop RSFF2 turns on/off the circuit that accelerates charging of the power-on reset time setting capacitor (CTP) at a reset. The RSFF2 operates only at a reset; it does not operate at a power-on reset when the power is turned on. 4 MB3793-27A ABSOLUTE MAXIMUM RATINGS (Ta = +25C) Parameter Symbol Conditions VCC -- CK1 VCK1 -- CK2 VCK2 -- INH IINH -- RESET IOL IOH Power supply voltage* Input voltage* Reset output current Power dissipation Storage temperature Rating Unit Min Max -0.3 +7 V -0.3 +7 V -- -10 +10 mA PD Ta +85C -- 200 mW Tstg -- -55 +125 C *: The voltage is based on the ground voltage (0 V). 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 Symbol Conditions Power supply voltage VCC Reset (RESET) output current Value Unit Min Typ Max -- 1.2 -- 6.0 V IOL IOH -- -5 -- +5 mA Power-on reset hold time setting capacity CTP -- 0.001 -- 10 F Watchdog-timer monitoring time setting capacity* CTW -- 0.001 -- 1 F Operating temperature Ta -- -40 -- +85 C *: The watchdog timer monitor time range depends on the rating of the setting capacitor. 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. 5 MB3793-27A ELECTRICAL CHARACTERISTICS 1. DC Characteristics (VCC = +3.3 V, Ta = +25C) Parameter Symbol Power supply current ICC1 After exit from reset VSL VCC falling VSH VCC rising Detection voltage Detection voltage hysteresis difference Clock-input threshold voltage Clock-input hysteresis Inhibition-input voltage Input current (CK1, CK2, INH) Reset output voltage Reset-output minimum power voltage Value Conditions Ta = +25 C Ta = -40 C to +85 C Ta = +25 C Ta = -40 C to +85 C Min Typ Max -- 31 55 2.63 2.70 2.77 (2.59)* 2.70 (2.81)* 2.69 2.76 2.87 (2.65)* 2.76 (2.87)* Unit A V V VSHYS VSH - VSL 35 65 95 mV VCIH CK rising (0.7)* 1.3 1.9 V VCIL CK falling 0.5 1.0 (1.5)* V V VCHTS -- (0.1)* 0.3 (0.6)* VIIH -- 2.2 -- -- VIIL -- -- 0 0.8 V IIH VCK = 5 V -- 0 1.0 A IIL VCK = 0 V -1.0 0 -- A VOH IRESET = -5 mA 2.8 3.10 -- V VOL IRESET = +5 mA -- 0.12 0.4 V VCCL IRESET = +50 A -- 0.8 1.2 V *: The values enclosed in parentheses ( ) are setting assurance values. 2. AC Characteristics (VCC = +3.3 V, Ta = +25C) Parameter Symbol Conditions Value Min Typ Max Power-on reset hold time tPR CTP = 0.1 F 30 75 120 ms VCC input pulse width tPI CTP = 0.1 F (8)*2 -- -- s VCC delay time tPD CTP = 0.1 F -- 2 (10)*2 s Watchdog timer monitor time tWD CTW = 0.01 F, CTP = 0.1 F 8 16 24 ms Watchdog timer reset time tWR CTP = 0.1 F 2 5.5 9 ms Clock input pulse width tCKW -- 500 -- -- ns Clock input pulse cycle tCKT -- 20 -- -- s Reset (RESET) output transition time Rising Falling r 1 CL = 50 pF -- -- 500 ns f 1 CL = 50 pF -- -- 500 ns t* t* *1:The voltage range is 10% to 90% at testing the reset output transition time. *2:The values enclosed in parentheses ( ) are setting assurance values. 6 Unit MB3793-27A DIAGRAM 1. Basic operation (Positive clock pulse) VSH VSL VCC tCKW CK1 tCKT CK2 INH Vth CTP VH CTW VL RESET tWD tPR (1) (2) (3) (4)(5) (5) tPR tWR (6) (7) (8) (9) (10) (11) (12) (13) 7 MB3793-27A 2. Basic operation (Negative clock pulse) VSH VSL VCC tCKW CK1 tCKT CK2 INH Vth CTP VH CTW VL RESET tPR (1) (2) 8 tWD (3) (4)(5) (5) tPR tWR (6) (7) (8) (9) (10) (11) (12) (13) MB3793-27A 3. Single-clock input monitoring (Positive clock pulse) tCKW CK1 CK2 tCKT Vth CTP VH CTW VL RESET tWD tWR Note : The MB3793 can monitor only one clock. The MB3793 checks the clock signal at every other input pulse. Therefore, set watchdog timer monitor time tWD to the time that allows the MB3793 to monitor the period twice as long as the input clock pulse. 9 MB3793-27A 4. Inhibition operation (Positive clock pulse) VSH VSL VCC tCKW CK1 CK2 INH Vth CTP VH CTW VL RESET tPR (1) (2) 10 tWD (3) (4)(5) (5) tPR tWR (6) (7) (11) (8) (9) (10) (12) (13) MB3793-27A 5. Clock pulse input supplementation (Positive clock pulse) *1 CK1 *2 CK2 VH CTW VL Note : The MB3793 watchdog timer monitors Clock1 (CK1) and Clock2 (CK2) pulses alternately. When a CK2 pulse is detected after detecting a CK1 pulse, the monitoring time setting capacity (CTW) switches to charging from discharging. When two consecutive pulses occur on one side of this alternation before switching, the second pulse is ignored. In the above figure, pulse *1 and *2 are ignored. OPERATION SEQUENCE 1. Positive clock pulse input See "1. Basic operation (positive clock pulse)" under " DIAGRAM." 2. Negative clock pulse input See "2. Basic operation (negative clock pulse)" under " DIAGRAM." The MB3793 operates in the same way whether it inputs positive or negative pulses. 3. Clock monitoring To use the MB3793 while monitoring only one clock, connect clock pins CK1 and CK2. Although the MB3793 operates basically in the same way as when monitoring two clocks, it monitors the clock signal at every other input pulse. See "3. Single-clock input monitoring (positive clock pulse)" under " DIAGRAM." 4. Description of Operations The numbers given to the following items correspond to numbers (1) to (13) used in " DIAGRAM." (1) The MB3793 outputs a reset signal when the supply voltage (VCC) reaches about 0.8 V (VCCL) (2) If VCC reaches or exceeds the rise-time detected voltage VSH, the MB3793 starts charging the power-on reset hold time setting capacitor CTP. At this time, the output remains in a reset state. The VSH value is about 2.76 V. 11 MB3793-27A (3) When CTP has been charged for a certain period of time TPR (until the CTP pin voltage exceeds the threshold voltage (Vth) after the start of charging), the MB3793 cancels the reset (setting the RESET pin to "H" level from "L" level). The Vth value is about 2.4 V with VCC = 3.3 V The power-on reset hold timer monitor time tPR is set with the following equation: tPR (ms) .=. A x CTP (F) The value of A is about 750 with VCC = 3.3 V and about 700 with VCC = 3.0 V. The MB3793 also starts charging the watchdog timer monitor time setting capacitor (CTW). (4) When the voltage at the watchdog timer monitor time setting pin CTW reaches the "H" level threshold voltage VH, the CTW switches from the charge state to the discharge state. The value of VH is always about 1.24 V regardless of the detected voltage. (5) If the CK2 pin inputs a clock pulse (positive edge trigger) when the CTW is being discharged in the CK1-CK2 order or simultaneously, the CTW switches from the discharge state to the charge state. The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses with the system logic circuit operating normally. (6) If no clock pulse is fed to the CK1 or CK2 pin within the watchdog timer monitor time tWD due to some problem with the system logic circuit, the CTW pin is set to the "L" level threshold voltage VL or less and the MB3793 outputs a reset signal (setting the RESET pin to "L" level from "H" level). The value of VL is always about 0.24 V regardless of the detected voltage. The watchdog timer monitor time tWD is set with the following equation: tWD (ms) .=. B x CTW (F) The value of B is hardly affected by the power supply voltage; it is about 1600 with VCC = 3.0 V to 3.3 V. (7) When a certain period of time tWR has passed (until the CTP pin voltage reaches or exceeds Vth again after recharging the CTP), the MB3793 cancels the reset signal and starts operating the watchdog timer. The watchdog timer monitor reset time tWR is set with the following equation: tWR (ms) .=. D x CTP (F) The value of D is 55 with VCC = 3.3 V and about 50 with VCC = 3.0 V. The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses. If no clock pulse is input, the MB3793 repeats operations (6) and (7). (8) If VCC is lowered to the fall-time detected voltage (VSL) or less, the CTP pin voltage decreases and the MB3793 outputs a reset signal (setting the RESET pin to "L" level from "H" level). The value of VSL is 2.7 V (9) When VCC reaches or exceeds VSH again, the MB3793 starts charging the CTP. (10) When the CTP pin voltage reaches or exceeds Vth, the MB3793 cancels the reset and restarts operating the watchdog timer. It repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses. (11) Making the inhibit pin active (setting the INH pin to "H" from "L") forces the watchdog timer to stop operation. This stops only the watchdog timer, leaving the MB3793 monitoring VCC (operations (8) to (10)). The watchdog timer remains inactive unless the inhibit input is canceled. (12) Canceling the inhibit input (setting the INH pin to "L" from "H") restarts the watchdog timer. (13) The reset signal is output when the power supply is turned off to set VCC to VSL or less. 12 MB3793-27A TYPICAL CHARACTERISTICS Detection voltage vs. ambient temperature Power supply current vs. power supply voltage 40 3.0 Ta = -40 C to +85 C 30 Detection voltage VSH, VSL (V) Power supply current ICC (A) 35 25 20 Watchdog timer monitoring (VINH = 0 V) 15 10 MB3793-27A VCC VINH f = 1 kHz Duty = 10 % VL = 0 V VH = VCC MAX 2.8 MAX VSL (Ta = +25 C) (Ta = -40 C to +85 C) 3.0 4.0 -40 -20 0 3.3 -40C +25C +85C -1 -2 -3 -4 40 60 80 100 -5 Reset output current IRESET (mA) Reset output voltage vs. reset output current (N-MOS side) Reset output voltage VRESET (V) Reset output voltage VRESET (V) Reset output voltage vs. reset output current (P-MOS side) 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 20 Ambient temperature Ta (C) Power supply voltage VCC(V) 0 VSL MIN CTP CTW 0.01 F 0.1 F 2.0 VSH MIN 2.6 1.0 TYP TYP 2.7 2.5 0 VSH (Ta = +25 C) 2.9 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 +85C +25C -40C 0 1 2 3 4 5 Reset output current IRESET (mA) Note: Without writing the value clearly, VCC = 3.3 (V), CTP = 0.1 (F), CTW = 0.01 (F). (Continued) 13 MB3793-27A (Continued) Power-on reset hold time vs.ambient temperature (When Vcc rising) Reset output voltage vs. power supply voltage 7 200 6 5 4 3 Ta = +85 C 2 Ta = +25 C 1 Ta = -40 C 160 1 2 3 100 80 40 0 Watchdog timer reset time tWR (ms) Ta = +25 C 14 12 10 MAX 8 TYP 6 4 2 0 MIN -40 -20 Watchdog timer monitoring time tWD (ms) 24 16 20 40 20 40 60 80 100 Ta = -40 C to +85 C MAX 22 20 Ta = +25 C 18 TYP 16 14 12 10 MIN 8 6 4 2 0 0 0 Watchdog timer monitoring time vs. ambient temperature 24 18 -40 -20 Ambient temperature Ta (C) 26 20 MIN 20 26 Ta = -40 C to +85 C TYP 60 Power supply voltage VCC (V) 22 MAX 120 4 Watchdog timer reset time vs.ambient temperature (When monitoring) Ta = +25 C 140 0 0 Ta = -40 C to +85 C 180 Power-on reset hold time tPR (ms) Reset output voltage VRESET (V) Pull-up resistance 100 k 60 80 100 Ambient temperature Ta (C) -40 -20 0 20 40 60 80 100 Ambient temperature Ta (C) (Continued) 14 MB3793-27A (Continued) Reset time vs. CTP capacitance 104 103 103 Reset time tWR (ms) Power-on reset time tPR (ms) Power-on reset time vs. CTP capacitance Ta = -40 C 2 10 Ta = +25 C 101 Ta = +85 C 1 10 -1 10-4 10-3 10-2 10-1 102 Ta = -40 C 1 10 1 Ta = +25 C Ta = +85 C -1 10 101 1 102 10-2 10-4 10-3 10-2 10-1 1 101 102 Power-on reset time setting capacitance Power-on reset time setting capacitance CTP (F) CTP (F) Watchdog timer monitoring time tWD (ms) Watchdog timer monitoring time vs. CTW capacitance 103 Ta = -40 C 102 Ta = +25 C 1 10 1 Ta = +85 C -1 10 10-5 10-4 10-3 10-2 10-1 1 101 Watchdog timer monitoring time setting capacitance CTW (F) 15 MB3793-27A APPLICATION EXAMPLE 1. Supply voltage monitor and watchdog timer (1-clock monitor) VCC 5 VCC 2 CTW RESET 1 M B 3 7 9 3 RESET CTW* 3 CTP CTP* CK1 8 VCC Microprocessor CK 6 INH GND 4 CK2 7 GND GND *: Use a capacitor with less leakage current. The MB3793 monitors the clock (CK1,2) at every other input pulse. 2. Supply voltage monitor and watchdog timer stop VCC 6 INH 5 VCC RESET 1 RESET M B 3 7 9 3 2 CTW CK1 8 VCC Microprocessor 1 CK HALT GND CTW* CTP* 3 CTP GND CK2 7 4 GND *: Use a capacitor with less leakage current. 16 RESET VCC Microprocessor 2 CK HALT GND MB3793-27A TYPICAL APPLICATION VCC 5 VCC 2 CTW RESET 1 RESET MB3793 CTW* CTP* 3 CTP RESET VCC Microprocessor 1 CK1 8 Microprocessor 2 CK CK GND GND 6 INH GND VCC CK2 7 4 GND *: Use a capacitor with less leakage current. 1. Equation of time-setting capacitances (CTP and CTW) and set time . tPR [ms] =. A x CTP [F] . tWD [ms] =. B x CTW [F] . tWR [ms] =. D x CTP [F] Values of A, B, C, and D A B C D Remark 750 1600 0 55 VCC = 3.3 V 700 1600 0 50 VCC = 3.0 V 2. Example (when CTP = 0.1 F and CTW = 0.01 F) Symbol time (ms) tPR tWD tWR VCC = 3.3 V . =. 75 . =. 16 . =. 5.5 VCC = 3.0 V . =. 70 . =. 16 . =. 5 17 MB3793-27A 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 k to 1 M 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. ORDERING INFORMATION Part number 18 Package Marking MB3793-27AP 8-pin Plastic DIP (DIP-8P-M01) 3793-Y MB3793-27APF 8-pin Plastic SOP (FPT-8P-M01) 3793-Y MB3793-27APNF 8-pin Plastic SOP (FPT-8P-M02) 3793-Y MB3793-27APFV 8-pin Plastic SSOP (FPT-8P-M03) 93-Y Remarks MB3793-27A PACKAGE DIMENSIONS Note 1) Note 2) Note 3) Note 4) 8-pin Plastic SOP (FPT-8P-M01) +0.25 *1 : These dimensions include resin protrusion. *2 : These dimensions do not include resin protrusion. Pins width and pins thickness include plating thickness. Pins width do not include tie bar cutting remainder. +.010 +0.03 *1 6.35 -0.20 .250 -.008 0.17 -0.04 +.001 8 .007 -.002 5 *2 5.300.30 7.800.40 (.209.012) (.307.016) INDEX Details of "A" part +0.25 2.00 -0.15 +.010 .079 -.006 1 1.27(.050) "A" 4 0.470.08 (.019.003) 0.13(.005) (Mounting height) 0.25(.010) 0~8 M 0.500.20 (.020.008) 0.600.15 (.024.006) +0.10 0.10 -0.05 +.004 .004 -.002 (Stand off) 0.10(.004) C 2002 FUJITSU LIMITED F08002S-c-6-7 Dimensions in mm (inches) . Note : The values in parentheses are reference values. (Continued) 19 MB3793-27A Note 1) Note 2) Note 3) Note 4) 8-pin Plastic SOP (FPT-8P-M02) *1 : These dimensions include resin protrusion. *2 : These dimensions do not include resin protrusion. Pins width and pins thickness include plating thickness. Pins width do not include tie bar cutting remainder. +0.03 +.010 *1 5.05 +0.25 -0.20 .199 -.008 0.22 -0.07 +.001 .009 -.003 8 5 *2 3.900.30 6.000.40 (.154.012) (.236.016) Details of "A" part 45 1.550.20 (Mounting height) (.061.008) 0.25(.010) 0.40(.016) 1 "A" 4 1.27(.050) 0.440.08 (.017.003) 0.13(.005) 0~8 M 0.500.20 (.020.008) 0.600.15 (.024.006) 0.150.10 (.006.004) (Stand off) 0.10(.004) C 2002 FUJITSU LIMITED F08004S-c-4-7 Dimensions in mm (inches) . Note : The values in parentheses are reference values. (Continued) 20 MB3793-27A Note 1) Note 2) Note 3) Note 4) 8-pin Plastic SSOP (FPT-8P-M03) *1 : Resin protrusion. (Each side : +0.15 (.006) MAX) . *2 : These dimensions do not include resin protrusion. Pins width and pins thickness include plating thickness. Pins width do not include tie bar cutting remainder. +0.03 *1 3.500.10(.138.004) 0.17 -0.04 +.001 8 .007 -.002 5 *2 4.200.10 6.200.20 (.165.004) (.244.008) INDEX Details of "A" part +0.20 1.25 -0.10 +.008 .049 -.004 (Mounting height) 0.25(.010) 1 "A" 4 0.80(.031) 0.370.08 (.015.003) 0.10(.004) 0~8 M 0.500.20 (.020.008) 0.600.15 (.024.006) 0.100.10 (.004.004) (Stand off) 0.10(.004) C 2002 FUJITSU LIMITED F08005S-c-3-5 Dimensions in mm (inches) . Note : The values in parentheses are reference values. (Continued) 21 MB3793-27A (Continued) 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 +0.30 0.99 -0 .039 0.89 .035 C +.012 -0 +0.35 -0.30 +.014 -.012 0.460.08 (.018.003) +0.30 1.52 -0 .060 +.012 -0 7.62(.300) TYP 15MAX 2.54(.100) TYP 1994 FUJITSU LIMITED D08006S-2C-3 Dimensions in mm (inches) . Note : The values in parentheses are reference values. 22 MB3793-27A FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information, such as descriptions of function and application circuit examples, in this document are presented solely for the purpose of reference to show examples of operations and uses of Fujitsu semiconductor device; Fujitsu does not warrant proper operation of the device with respect to use based on such information. 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