MM1099A

MITSUMI System Reset (Built-in Watch Dog Timer) MM1099 System Reset (Built-in Watch Dog Timer) Monolithic IC MM1099 Outline The function of this IC series MM1099 is to accurately reset systems, a generating reset signal at the time of instantaneous supply voltage off or lowering in varied CPU and other logic system. Further, with the watch dog timer built-in it can diagnose the operation of the system, intermittently generating reset pulses when they operate erroneously to prevent runaway. Features 1. 2. 3. 4. 5. Built-in watch dog timer Low current consumption 130µA TYP. Low operating threshold voltage VCC=0.8V Watch dog stop function (RCT terminal) Long clock monitoring time TPR (POWER ON) : TWD (clock monitoring)=1 : 1 6. Fewer outer components Package DIP-8B (MM1099AD, MM1099BD) SOP-8C (MM1099AF, MM1099BF) SIP-8A (MM1099AS, MM1099BS) Applications 1. Reset circuit for microcomputers, CPU and MPU. 2. Reset circuit for logic circuitry. 3. Monitoring of microcomputer system, etc. Pin Assignmemt 1 2 3 8 7 6 5 4 5 1 2 3 4 6 7 SOP-8C/DIP-8B 8 TC N.C CK GND VCC RCT VS ---------------------------------------------------------- 1 2 3 4 12345678 SIP-8A 5 6 7 8 TC N.C CK GND VCC RCT VS ---------------------------------------------------------- RESET RESET MITSUMI System Reset (Built-in Watch Dog Timer) MM1099 Pin Description Pin No. Pin name TC N.C CK GND VCC RCT VS RESET Clock input terminal Inputs the clock from the logic system. Ground terminal Voltage detection MM1099A 3.2V MM1099B 4.2V OPEN, Stop connect to GND Watchdog timer stop pin Operation modes: Operation Detect voltage variable terminal Reset output pin (low output) Variable terminals TWD, TWR and TPR The time for TWD, TWR and TPR to be determined by the external capacitor. 2 3 4 5 6 7 8 Function TPR (mS) = 5000 CT (µF) TWD (mS) = 500 CT (µF) TWR(mS) = 100 CT (µF) 1 Absolute Maximum Ratings Item Power supply voltage CK pin input voltage VS pin input voltage Voltage applied to RCT pin ---------------------------------------------------- Symbol VCC max. VCK VVS VRCT VOH Pd TSTG Rating -0.3~+10 -0.3~VCC+0.3 ( < +10) = -0.3~VCC+0.3 ( < +10) = -0.3~VCC+0.3 ( < +10) = -0.3~VCC+0.3 ( < +10) = 300 -40~+125 Units V V V V V mW °C Voltage applied to RESET pin Allowable loss Storage temperature Recommended Operating Conditions Item Power supply voltage ---------------------------------------------------- Symbol VCC IOL TWD tFC, tRC CT TOP Rating +2.2~+7.0 0~1.0 0.1~1000