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ds04-27406-3e fujitsu semiconductor data sheet assp for power supply applications power voltage monitoring ic with watchdog timer mb3793 -30a n n n n 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 applicaiton systems. there is also a mask option that can detect voltages of 4.9 v to 2.4 v in 0.1-v steps. n n n n features ? precise detection of power voltage fall: 2.5% ? detection voltage with hysteresis ? low power dispersion: i cc = 31 m a (reference) ? internal dual-input watchdog timer ? watchdog-timer halt function (by inhibition pin) ? independently-set wacthdog and reset times n n n n package 8-pin, plastic sop (fpt-8p-m01) 8-pin, plastic sol (fpt-8p-m02) 8-pin, plastic ssop (fpt-8p-m03) 8-pin, plastic dip (dit-8p-m01)
mb3793 -30a 2 n n n n pin assignment n n n n pin description pin no. symbol descriptions pin no. symbol descriptions 1 reset outputs reset pin 5 v cc power supply pin 2ctw watchdog timer monitor time setting pin 6 inh inhibit pin 3ctp power-on reset hold time set- ting pin 7 ck2 inputs clock 2 pin 4 gnd ground pin 8 ck1 inputs clock 1 pin reset ctw ctp gnd ck1 ck2 inh v cc (fpt-8p-m01) (fpt-8p-m02) (fpt-8p-m03) (dip-8p-m01) (top view) 1 2 3 4 8 7 6 5
mb3793 -30a 3 n n n n block diagram i 1 = 3 m a . . i 2 = 30 m a . . r 1 = 360 k w . . 3 1 6 2 8 7 5 4 ctp to v cc of all blocks pulse generator 1 watchdog timer reference voltage generator to gnd of all blocks pulse generator 2 output circuit logic circuit reset inh ctw ck1 ck2 v cc gnd comp.s - + v s v ref = 1.24 v . . r 2 = 240 k w . .
mb3793 -30a 4 n n n n block description 1. comp. s comp. s is a comparator with hysteresis to compare the reference voltage with a voltage (v s ) that is the result of dividing the power voltage (v cc ) by resistors 1 and 2. when v s falls below 1.24 v, a reset signal is output. this function enables the mb3793 to detect an abnormality 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 (c tp ). flip-flop rsff2 turns on/off the circuit that accelerates charging of the power-on reset time setting capacitor (c tp ) 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.
mb3793 -30a 5 n n n n absolute maximum ratings (ta = + 25 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. n n n n recommended operating conditions * : 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 devices 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. parameter symbol conditions rating unit min max power supply voltage* v cc ?- 0.3 + 7v input voltage* ck1 v ck1 ? - 0.3 v cc + 0.3 ( + 7) v ck2 v ck2 ? inh i inh ? reset output voltage* reset v ol v oh ?- 0.3 v cc + 0.3 ( + 7) v reset output current i ol i oh ?- 10 + 10 ma power dissipation p d ta + 85 c ? 200 mw storage temperature tstg ?- 55 + 125 c parameter symbol conditions value unit min typ max power supply voltage v cc ? 1.2 3.3 6.0 v reset (reset ) output current i ol ? 0 + 5 ma i oh ?- 5 0 power-on reset hold time setting capacity c tp ? 0.001 0.1 10 m f watchdog-timer monitoring time setting capacity* c tw ? 0.001 0.01 1 m f operating temperature ta ?- 40 + 25 + 85 c
mb3793 -30a 6 n n n n electrical characteristics 1. dc characteristics (v cc = + 3.3 v, ta = + 25 c) * : the values enclosed in parentheses ( ) are setting assurance values. 2. ac characteristics (v cc = + 3.3 v, ta = + 25 c) * : the voltage range is 10 % to 90 % at testing the reset output transition time. parameter symbol conditions value unit min typ max power supply current i cc1 after exit from reset ? 31 45 m a detection voltage v sl v cc falling ta = + 25 c 2.93 3.00 3.07 v ta = - 40 c to + 85 c (2.89)* 3.00 (3.11)* v sh v cc rising ta = + 25 c 3.00 3.07 3.14 v ta = - 40 c to + 85 c (2.96)* 3.07 (3.18)* detection voltage hysteresis difference v shys v sh C v sl 30 70 110 mv clock-input threshold voltage v cih ck rising (0.7)* 1.3 1.9 v v cil ck falling 0.5 1.0 (1.5)* v clock-input hysteresis v chys ? (0.1)* 0.3 (0.6)* v inhibition-input voltage v iih ? 2.2 ? v cc v v iil ? 0 ? 0.8 input current (ck1, ck2, inh) i ih v ck = 5 v ? 01.0 m a i il v ck = 0 v - 1.0 0 ?m a reset output voltage v oh i reset = - 3 ma 2.8 3.10 ? v v ol i reset = + 3 ma ? 0.12 0.4 v reset-output minimum power voltage v ccl i reset = + 50 m a ? 0.8 1.2 v parameter symbol conditions value unit min typ max power-on reset hold time t pr c tp = 0.1 m f 30 75 120 ms watchdog timer monitor time t wd c tw = 0.01 m f, c tp = 0.1 m f 81624ms watchdog timer reset time t wr c tp = 0.1 m f25.59ms clock input pulse width t ckw ? 500 ?? ns clock input pulse cycle t ckt ? 20 ??m s reset (reset ) output transition time rising t r *c l = 50 pf ?? 500 ns falling t f *c l = 50 pf ?? 500 ns
mb3793 -30a 7 n n n n diagram 1. basic operation (positive clock pulse) ctp reset inh ctw ck1 ck2 v sh v cc v sl v th v h v l (1) (2) (3) (4)(5) (5) (6) (7) (8) (9) (10) (11) (12) (13) t pr t wd t pr t wr t ckw t ckt
mb3793 -30a 8 2. basic operation (negative clock pulse) ctp reset inh ctw ck1 ck2 v sh v cc v sl v th v h v l t pr t wd t pr t wr t ckw t ckt (1) (2) (3) (4)(5) (5) (6) (7) (8) (9) (10) (11) (12) (13)
mb3793 -30a 9 3. single-clock input monitoring (positive clock pulse) ctp reset ctw ck1 v th v h v l ck2 t wr t wd t ckt t ckw 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 t wd to the time that allows the mb3793 to monitor the period twice as long as the input clock pulse.
mb3793 -30a 10 4. inhibition operation (positive clock pulse) ctp reset inh ctw ck1 ck2 v sh v cc v sl v th v h v l t pr t wd t pr t wr t ckw (1) (2) (3) (4)(5) (5) (6) (7) (11) (8) (9) (10) (12) (13)
mb3793 -30a 11 5. clock pulse input supplementation (positive clock pulse) ctw ck1 ck2 v h v l t ckt t ckw * 1 * 2 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 (c tw ) 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.
mb3793 -30a 12 n n n n operation sequence 1. positive clock pulse input see 1. basic operation (positive clock pulse) under n diagram. 2. negative clock pulse input see 2. basic operation (negative clock pulse) under n 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 n diagram. 4. description of operations the numbers given to the following items correspond to numbers (1) to (13) used in n diagram. (1) the mb3793 outputs a reset signal when the supply voltage (v cc ) reaches about 0.8 v (v ccl ) (2) if v cc reaches or exceeds the rise-time detected voltage v sh , the mb3793 starts charging the power-on reset hold time setting capacitor c tp . at this time, the output remains in a reset state. the v sh value is 3.07 v (typ) . (3) when c tp has been charged for a certain period of time t pr (until the ctp pin voltage exceeds the threshold voltage (v th ) after the start of charging), the mb3793 cancels the reset (setting the reset pin to h level from l level). the v th value is about 2.4 v with v cc = 3.3 v the power-on reset hold timer monitor time t pr is set with the following equation: t pr (ms) a c tp ( m f) the value of a is about 750 with v cc = 3.3 v. the mb3793 also starts charging the watchdog timer monitor time setting capacitor (c tw ). (4) when the voltage at the watchdog timer monitor time setting pin c tw reaches the h level threshold voltage v h , the c tw switches from the charge state to the discharge state. the value of v h 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 c tw is being discharged in the ck1-ck2 order or simultaneously, the c tw 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 t wd due to some problem with the system logic circuit, the ctw pin is set to the l level threshold voltage v l or less and the mb3793 outputs a reset signal (setting the reset pin to l level from h level). the value of v l is always about 0.24 v regardless of the detected voltage. the watchdog timer monitor time t wd is set with the following equation: t wd (ms) b c tw ( m f) the value of b is hardly affected by the power supply voltage; it is about 1600 with v cc = 3.3 v. (continued) . . = . . =
mb3793 -30a 13 (continued) (7) when a certain period of time t wr has passed (until the ctp pin voltage reaches or exceeds vth again after recharging the c tp ), the mb3793 cancels the reset signal and starts operating the watchdog timer. the watchdog timer monitor reset time t wr is set with the following equation: t wr (ms) d x c tp ( m f) the value of d is 55 with v cc = 3.3 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 v cc is lowered to the fall-time detected voltage (v sl ) 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 v sl is 3.0 v (typ) . (9) when v cc reaches or exceeds v sh again, the mb3793 starts charging the c tp . (10) when the ctp pin voltage reaches or exceeds v th , 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 v cc (operations (8) to (10)). the watchdog timer remains inactive unless the inhibit input is canceled. the inhibition (inh) pin must be connecting a voltage of more low impedance, to evade of the noise. (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 v cc to v sl or less. . . = 1. equation of time-setting capacitances (c tp and c tw ) and set time t pr [ms] a c tp [ m f] t wd [ms] b c tw [ m f] t wr [ms] d c tp [ m f] values of a, b, c, and d 2. example (when c tp = 0.1 m f and c tw = 0.01 m f ) abcdremark 750 1600 0 55 v cc = 3.3 v 1300 1500 0 100 v cc = 5.0 v time (ms) symbol v cc = 3.3 v v cc = 5.0 v t pr 75 130 t wd 16 15 t wr 5.5 10 = . . = . . = . .
mb3793 -30a 14 n n n n typical characteristics note : without writing the value clearly, vcc = 3.3 (v), ctp = 0.1 ( m f), ctw = 0.01 ( m f). (continued) 0 5 10 15 20 25 30 35 40 45 50 0 1 2 3 4 5 6 7 8 watchdog timer monitoring (v inh = 0 v) watchdog timer stopping (v inh = v cc ) f = 1 khz duty = 10 % ck1 = ck2 2.96 2.98 3.00 3.02 3.04 3.06 3.08 3.10 3.12 - 40 - 20 0 20 40 60 80 100 120 v sh v sl 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.3 3.2 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 at v cc = 3.3 v + 25 ?c + 85 ?c - 40 ?c 0 100 400 300 200 500 600 012345678910 at v cc = 3.3 v + 25 ?c + 85 ?c - 40 ?c power supply current vs. power supply voltage detection voltage vs. ambient temperature power supply voltage v cc (v) power supply current i cc ( m m m m a) detection voltage v sh , v sl (v) ambient temperature ta ( c) reset output voltage vs. reset output current (p-mos side) reset output current i reset (ma) reset output voltage v reset (v) reset output voltage vs. reset output current (n-mos side) reset output current i reset (ma) reset output voltage v reset (v)
mb3793 -30a 15 (continued) 7 6 5 4 3 2 1 0 0123 ta = + 85 ?c ta = + 25 ?c ta = - 40 ?c 4 567 pull-up resistance 100 k w - 40 - 20 0 20406080100 0 20 40 60 80 100 120 140 160 180 200 120 at v cc = 3.3 v - 40 - 20 0 20406080100 0 2 4 6 8 10 12 14 16 18 20 22 24 26 120 at v cc = 3.3 v - 40 - 20 0 20406080100 0 2 4 6 8 10 12 14 16 18 20 22 24 26 120 at v cc = 3.3 v reset output voltage vs. power supply voltage power-on reset hold time vs. ambient temperature (when v cc rising) reset output voltage v reset (v) power supply voltage v cc (v) power-on reset hold time t pr (ms) ambient temperature ta ( c) watchdog timer reset time vs. ambient temperature (when monitoring) watchdog timer reset time t wr (ms) ambient temperature ta ( c) watchdog timer monitoring time vs. ambient temperature watchdog timer monitoring time t wd (ms) ambient temperature ta ( c)
mb3793 -30a 16 (continued) 10 4 10 3 10 2 10 1 1 10 - 1 10 - 4 10 - 3 10 - 2 10 - 1 110 1 10 2 ta = - 40 c ta = + 25 c ta = + 85 c 10 3 10 2 10 1 1 10 - 1 10 - 4 10 - 3 10 - 2 10 - 1 110 1 10 2 10 - 2 ta = - 40 c ta = + 25 c ta = + 85 c 10 3 10 2 10 1 1 10 - 1 10 - 4 10 - 3 10 - 2 10 - 1 110 1 10 - 5 ta = - 40 c ta = + 25 c ta = + 85 c power-on reset time vs. c tp capacitance power-on reset time t pr (ms) power-on reset time setting capacitance c tp ( m m m m f) reset time vs. c tp capacitance reset time t wr (ms) power-on reset time setting capacitance c tp ( m m m m f) watchdog timer monitoring time vs. c tw capacitance watchdog timer monitoring time t wd (ms) watchdog timer monitoring time setting capacitance c tw ( m m m m f)
mb3793 -30a 17 n n n n application example 1. (1) supply voltage monitor and watchdog timer (1-clock monitor) (2) supply voltage monitor and watching timer (2-clock monitor) 5 2 3 6 4 7 8 1 reset microprocessor v cc reset ck gnd gnd gnd c tw * c tp * v cc v cc ctw ctp ck1 ck2 inh mb3793 * : use a capacitor with less leakage current. the mb3793 monitors the clock (ck1,2) at every other input pulse. 2 3 6 1 8 7 4 5 v cc c tw *c tp * gnd inh gnd v cc ctp ctw reset ck1 ck2 reset microprocessor 1 microprocessor 2 ck gnd v cc reset ck gnd v cc mb3793 * : use a capacitor with less leakage current.
mb3793 -30a 18 2. supply voltage monitor and watchdog timer stop n n n n 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 w to 1 m w 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. gnd c tw * c tp * v cc reset v cc ck gnd reset microprocessor 1 microprocessor 2 v cc ck gnd halt halt 5 6 2 3 4 7 8 1 reset gnd v cc inh ctw ck1 ck2 ctp mb3793 * : use a capacitor with less leakage current.
mb3793 -30a 19 n n n n ordering information part number package marking remarks mb3793-30ap 8-pin plastic dip (dip-8p-m01) 3793an mb3793-30apf 8-pin plastic sop (fpt-8p-m01) 3793an MB3793-30APNF 8-pin plastic sol (fpt-8p-m02) 3793an mb3793-30apfv 8-pin plastic ssop (fpt-8p-m03) 93an
mb3793 -30a 20 n n n n package dimensions (continued) c 2002 fujitsu limited f08002s-c-6-7 0.13(.005) m details of "a" part 7.800.40 5.300.30 (.209.012) (.307.016) .250 C.008 +.010 C0.20 +0.25 6.35 index 1.27(.050) 0.10(.004) 14 5 8 0.470.08 (.019.003) C0.04 +0.03 0.17 .007 +.001 C.002 "a" 0.25(.010) (stand off) 0~8 ? (mounting height) 2.00 +0.25 C0.15 .079 +.010 C.006 0.500.20 (.020.008) 0.600.15 (.024.006) 0.10 +0.10 C0.05 C.002 +.004 .004 * 1 0.10(.004) * 2 dimensions in mm (inches) . note : the values in parentheses are reference values. 8-pin plastic sop (fpt-8p-m01) note 1) *1 : these dimensions include resin protrusion. note 2) *2 : these dimensions do not include resin protrusion. note 3) pins width and pins thickness include plating thickness. note 4) pins width do not include tie bar cutting remainder.
mb3793 -30a 21 (continued) 8-pin plastic sop (fpt-8p-m02) c 2002 fujitsu limited f08004s-c-4-7 1.27(.050) 3.900.30 6.000.40 .199 C.008 +.010 C0.20 +0.25 5.05 0.13(.005) m (.154.012) (.236.016) 0.10(.004) 14 5 8 0.440.08 (.017.003) C0.07 +0.03 0.22 .009 +.001 C.003 45 ? 0.40(.016) "a" 0~8 ? 0.25(.010) (mounting height) details of "a" part 1.550.20 (.061.008) 0.500.20 (.020.008) 0.600.15 (.024.006) 0.150.10 (.006.004) (stand off) 0.10(.004) * 1 * 2 dimensions in mm (inches) . note : the values in parentheses are reference values. note 1) *1 : these dimensions include resin protrusion. note 2) *2 : these dimensions do not include resin protrusion. note 3) pins width and pins thickness include plating thickness. note 4) pins width do not include tie bar cutting remainder.
mb3793 -30a 22 (continued) 8-pin plastic ssop (fpt-8p-m03) c 2002 fujitsu limited f08005s-c-3-5 3.500.10(.138.004) 4.200.10 6.200.20 (.244.008) (.165.004) 0.10(.004) m .049 C.004 +.008 C0.10 +0.20 1.25 index * 1 0.80(.031) 0.10(.004) 0~8 ? 0.25(.010) (mounting height) 14 5 8 0.370.08 (.015.003) C0.04 +0.03 0.17 .007 +.001 C.002 "a" 0.500.20 (.020.008) 0.600.15 (.024.006) 0.100.10 (stand off) (.004.004) details of "a" part 0.10(.004) * 2 dimensions in mm (inches) . note : the values in parentheses are reference values. note 1) *1 : resin protrusion. (each side : + 0.15 (.006) max) . note 2) *2 : these dimensions do not include resin protrusion. note 3) pins width and pins thickness include plating thickness. note 4) pins width do not include tie bar cutting remainder.
mb3793 -30a 23 (continued) 8-pin plastic dip (dip-8p-m01) c 1994 fujitsu limited d08006s-2c-3 0.89 +0.35 ?.30 ?.30 +0.40 9.40 ? 0.99 1.52 +0.30 ? +.014 ?012 .035 .370 ?012 +.016 .060 ? +.012 +.012 ? .039 4.36(.172)max 3.00(.118)min 2.54(.100) typ 0.46?.08 (.018?003) 0.25?.05 (.010?002) 0.51(.020)min 7.62(.300) typ 15?ax 1 pin index 6.20?.25 (.244?010) +0.30 dimensions in mm (inches) . note : the values in parentheses are reference values.
mb3793 -30a 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. when you develop equipment incorporating the device based on such information, you must assume any responsibility arising out of such use of the information. fujitsu assumes no liability for any damages whatsoever arising out of the use of the information. any information in this document, including descriptions of function and schematic diagrams, shall not be construed as license of the use or exercise of any intellectual property right, such as patent right or copyright, or any other right of fujitsu or any third party or does fujitsu warrant non-infringement of any third-partys intellectual property right or other right by using such information. fujitsu assumes no liability for any infringement of the intellectual property rights or other rights of third parties which would result from the use of information contained herein. the products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for use accompanying fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for use requiring extremely high reliability (i.e., submersible repeater and artificial satellite). please note that fujitsu will not be liable against you and/or any third party for any claims or damages arising in connection with above-mentioned uses of the products. any semiconductor devices have an inherent chance of failure. you must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. if any products described in this document represent goods or technologies subject to certain restrictions on export under the foreign exchange and foreign trade law of japan, the prior authorization by japanese government will be required for export of those products from japan. f0308 ? fujitsu limited printed in japan

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