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| MITSUMI System Reset (with built-in watchdog timer) MM1136 System Reset (with built-in watchdog timer) Monolithic IC MM1136 Outline These ICs were developed to drive low voltage batteries, and have a watchdog timer with built-in microcomputer reset voltage detection circuit and low battery detection circuit. A single reference voltage is used for low battery voltage detection and microcomputer reset voltage . detection, so detection voltage difference is uniform ( = 0.2V). Further, there is a built-in watchdog timer for . operation diagnosis, which prevents the system from running wild by generating an intermittent reset pulse during system mis-operation. Features 1. Accurate voltage drop detection voltage 1. Low battery detection 3.4V3% 2. Power supply voltage detection 3.2V3% 3. Detection voltage error 0.2V20mV 1-2 4. Hysteresis Both 50mV typ. 2. Watchdog function stop pin (can be made to function only as reset IC during VCC rise) 3. Low current consumption 150A typ. Package SOP-8C (MM1136XF) Applications 1. 3V cordless telephones 2. Various types of small, handy equipment Series Table Model MM1136 VSLB 3.4V VSLR 3.2V TPR 100ms TWD 100ms TWR 2ms TPR : Reset hold time during VCC rise TWD : Timer monitoring time TWR : Reset time VSLB : Battery check detection voltage VSLR : Reset detection voltage *CT=0.02F MITSUMI System Reset (with built-in watchdog timer) MM1136 Pin Assignment 1 2 8 7 6 5 3 4 5 1 2 3 4 6 7 SOP-8C (TOP VIEW) 8 TC BC (RESET) CK GND VCC RCT VS RESET Pin Description Pin No. 1 2 3 4 5 6 7 8 Pin name TC BC (RESET) CK GND VCC RCT VS ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Function TWD, TWR, TPR time setting pins. Battery check output pin (RESET low level output) for 3.4V Clock input pin GND pin Power supply voltage input pin Watchdog timer stop pin Operation OPEN, Stop connect to GND Detection voltage fine adjustment pin Reset output pin (low output) RESET Block Diagram MITSUMI System Reset (with built-in watchdog timer) MM1136 Absolute Maximum Ratings Item Power supply voltage Voltage applied to input pin Voltage applied to output pin Allowable loss Storage temperature Symbol VCC max. VIN VOUT Pd TSTG Rating -0.3~+7 -0.3~VCC+0.3 ( < +7) = -0.3~VCC+0.3 ( < +7) = 450 -40~+125 Units V V V mW C Recommended Operating Conditions Item Power supply voltage -------------------------------------------------- Symbol VCC IOLR IOLC VCKH VCKL TWD tRCK, tFCK tRVCC tFVCC CT TOP Rating +2.5~+6.5 0~1.5 0~1.5 1.4< <0.4 1~1000 <100 100< 50< 0.002~2 -25~+75 Units V mA mA V V ms s s s F C RESET sync current BC sync current Clock input high level voltage Clock input low level voltage Clock monitoring time setting Clock rise and fall times Power supply voltage rise times Power supply voltage fall times TC pin capacitance Operating temperature MITSUMI System Reset (with built-in watchdog timer) MM1136 Electrical Characteristics Item Consumption current RESET detection voltage Detection voltage temperature coefficient R Hysteresis voltage R BC detection voltage Detection voltage temperature coefficient B Hysteresis voltage B Detection voltage difference CK input threshold CK input current Output voltage RH Output voltage BH Output voltage RL Output voltage BL Output sync current R Output sync current B Output source current R CT charge current Minimum operating power supply ----------------------------------------------- (Except where noted otherwise, Ta=25C, VCC=3.8V) (Except where noted otherwise, resistance unit is ) Symbol ICC VSLR VSR T VHYSR VSLB VSB T VHYSB VSL VTH IIH IIL VOHR VOHB VOLR VOLB IOLR IOLB IOHR ICT1 ICT2 VCC Measurement conditions No load VCC : High Low RCT : GND, VTC=OPEN Min. Typ. Max. Units 200 3.10 3.20 280 3.30 A V 0.01 0.05 %/C VCC : Low VCC : High High 25 3.30 50 3.40 100 3.50 mV V RCT : GND, VTC=OPEN Low, RLB=10k 0.01 0.05 %/C VCC : Low High, RLB=10k 25 0.18 0.8 VCK=3.8V VCK=0.0V IRESET=-5A RLB=10k IRESET=1mA, VCC=3.0V IBC=5mA, VCC=3.0V VRESET=0.5V, VCC=3.0V VBC=0.5V, VCC=3.0V VRESET=3.4V --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 50 0.20 1.2 0 -6 3.4 3.6 0.3 0.3 100 0.22 2 1 -2 mV V V A V V VSL=VSLB-VSLR -15 3.0 3.2 0.5 0.5 V V mA mA A A A V 1 5 8 2 10 15 VTC=1.0V during watchdog timer operation -0.48 -0.24 -0.16 VTC=1.0V during power ON reset operation -0.48 -0.24 -0.16 VRESET=0.4V IRESET=0.1mA ----------------------------------------------------------------------------------------------------- voltage to ensure RESET 0.8 1.0 MITSUMI System Reset (with built-in watchdog timer) MM1136 VCC input pulse width TPI TCKW TCK VCC CK CK 3.8V 2.8V TCKW or TPI 8 3 20 50 1 50 100 2 100 10 10 10 2 10 2 150 3 150 s s s ms ms ms s s s s s s CK input pulse width CK input cycle Watchdog timer monitoring time 1 TCK CT=0.02F CT=0.02F CT=0.02F VCC : High VCC : High Low, RLR=10k, CLR=15pF Low, RLB=4.7k, CLB=15pF * TWD TWR TPR tPDR tPDB tRR tFR tRB tFB Watchdog timer reset time 2 * Reset hold time for power supply rise 3 ------------------------------------------ * RESET delay time BC delay time ------------------------------------------ RESET rise time ------------------------------------------ RLR=10k, CLR=15pF RLR=10k, CLR=15pF RLB=4.7k, CLB=15pF RLB=4.7k, CLB=15pF RESET fall time BC rise time BC fall time Notes: 1 Monitoring time is the time from the last pulse (negative edge) of the timer clear clock pulse until reset pulse output. In other words, reset output is output if a clock pulse is not input during this time. 2 Reset time means reset pulse width. However, this does not apply to power ON reset. 3 Reset hold time is the time from when VCC exceeds detection voltage (VSHR) during power ON reset until reset release (RESET output high). 4 Watchdog timer monitoring time (TWD), watchdog timer reset time (TWR) and reset hold time (TPR) during power supply rise can be changed by varying CT capacitance. The times are expressed by the following formulae. TPR (ms) . . 5000 CT (F) = TWD (ms) . . 5000 CT (F) = . 100 CT (F) TWR (ms) = . Example : When CT=0.02F TPR . . 100ms = TWD . . 100ms = . 2ms TWR = . 5 TWD can be varied by placing a resistor (1MEG or more) between the RCT pin and VCC. 6 The voltage range when measuring output rise and fall time is 10~90%. 7 VCC rise time should be 100s or more, and fall time should be 50s or more. * * * * ----------------------------------------------------- * * * MITSUMI System Reset (with built-in watchdog timer) MM1136 Measuring Circuit Timing Chart VCC VSLB VSHB VSMR VSLR 0.8V TCKW TCK CK CT RESET TPR TWR TWD BC RCT Undefined Basic Circuit Diagram |
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