MM1095BD

MITSUMI System Reset (with built-in watchdog timer) MM1095 System Reset (with built-in watchdog timer) Monolithic IC MM1095 Outline This IC functions in a variety of CPU systems and other logic systems to generate a reset signal and reset the system accurately during momentary interruption or lowering of power supply voltage. It also has a built-in watchdog timer for operation diagnosis. This prevents the system from running wild by generating an intermittent reset pulse during system mis-operation. Features 1. 2. 3. 4. 5. Built-in watchdog timer Low minimum operating voltage Low operating limit voltage Watchdog stop function (RCT pin) Few external parts 100µA typ. Vcc=0.8V Package DIP-8B (MM1095AD, MM1095BD) SOP-8C (MM1095AF, MM1095BF) SIP-8A (MM1095AS, MM1095BS) Applications 1. Reset circuits in microcomputers, CPUs and MPUs 2. Logic circuit reset circuits 3. Microcomputer system monitoring, etc. Pin Assignment 1 2 8 7 6 5 3 4 5 1 2 3 4 6 7 SOP-8C/DIP-8B 8 TC NC CK GND VCC RCT VS ------------------------------------------ 1 2 3 4 12345678 SIP-8A 5 6 7 8 TC NC CK GND VCC RCT VS ------------------------------------------ RESET RESET MITSUMI System Reset (with built-in watchdog timer) MM1095 Pin Description Pin No. Name TC N.C CK GND VCC RCT VS ------------------------------------------------------------------------------------ Function . (TWD, TWR and TPR times are determined by the external capacitor.) TWD, TWR, TPR variable pins TPR (mS)=5000 TWD (mS)=500 TWR (mS)=100 CT (µF) CT (µF) CT (µF) 1 2 3 4 5 6 7 8 Clock input pin, inputs clock from logic system GND pin Voltage detection MM1095A 3.2V, MM1095B 4.2V OPEN, Stop connect to GND Watchdog timer stop pin Operation modes : Operation Detection voltage variable pin RESET Reset output pin (low output) 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) = 400 -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