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TC1232 Datasheet(PDF) 1 Page - TelCom Semiconductor, Inc |
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TC1232 Datasheet(HTML) 1 Page - TelCom Semiconductor, Inc |
1 / 6 page 5-19 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 PRELIMINARY INFORMATION TC1232 FEATURES s Precision Voltage Monitor ....................... Adjustable +4.5V or +4.75V s Reset Pulse Width ............................. 250msec Min s No External Components s Adjustable Watchdog Timer ........................ 150msec, 600msec or 1.2sec s Debounced Manual Reset Input for External Override MICROPROCESSOR MONITOR APPLICATIONS s Computers s Controllers s Intelligent Instruments s Automotive Systems s Critical µP Power Monitoring FUNCTIONAL BLOCK DIAGRAM VCC TC1232 + – 5%/10% TOLERANCE SELECT TOL DEBOUNCE WATCHDOG TIMEBASE SELECT PB RST TD GND REF WATCHDOG TIMER RESET GENERATOR RST RST ST + ORDERING INFORMATION Part No. Package Temp. Range TC1232COA 8-Pin SOIC 0 °C to +70°C TC1232COE 16-Pin SOIC (Wide) 0 °C to +70°C TC1232CPA 8-Pin PDIP 0 °C to +70°C TC1232EOA 8-Pin SOIC – 40 °C to +85°C TC1232EOE 16-Pin SOIC (Wide) – 40 °C to +85°C TC1232EPA 8-Pin PDIP – 40 °C to +85°C TC1232-4 11/6/96 GENERAL DESCRIPTION The TC1232 is a fully-integrated processor supervisor. It provides three important functions to safeguard processor sanity: precision power on/off reset control, watchdog timer and external reset override. On power-up, the TC1232 holds the processor in the reset state for a minimum of 250msec after VCC is within tolerance to ensure a stable system start-up. Microprocessor sanity is monitored by the on-board watchdog circuit. The microprocessor must provide a peri- odic low-going signal on the ST input. Should the processor fail to supply this signal within the selected time-out period (150msec, 600msec or 1200msec), an out-of-control pro- cessor is indicated and the TC1232 issues a processor reset as a result. The outputs of the TC1232 are immediately driven active when the PB input is brought low by an external push- button switch or other electronic signal. When connected to a push-button switch, the TC1232 provides contact debounce. The TC1232 is packaged in a space-saving 8-pin plastic DIP or SOIC package and requires no external components. |
Número de pieza similar - TC1232 |
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Descripción similar - TC1232 |
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