TC1232 Microprocessor Monitor Features: General Description: Precision Voltage Monitor: The TC1232 is a fully-integrated processor supervisor that provides three important functions to safeguard - Adjustable +4.5V or +4.75V processor sanity: precision power on/off Reset control, Reset Pulse Width 250 ms minimum Watchdog Timer and external Reset override. No External Components On power-up, the TC1232 holds the processor in the Adjustable Watchdog Timer: Reset state for a minimum of 250 ms after V is within CC - 150 ms, 600 ms or 1.2s tolerance to ensure a stable system start-up. Operating Voltage 4.0V to 5.5V Microprocessor sanity is monitored by the on-board Debounced Manual Reset Input for External watchdog circuit. The microprocessor must provide a Override periodic low-going signal on the ST input. Should the processor fail to supply this signal within the selected Block Diagram time-out period (150 ms, 600 ms or 1200 ms), an out- of-control processor is indicated and the TC1232 V CC issues a processor Reset as a result. RST Tolerance Select The outputs of the TC1232 are immediately driven + TOL (5% or 10%) RST 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 V REF provides contact debounce. The TC1232 is packaged in a space-saving 8-Pin PDIP Reset PB RST Debounce Generator or SOIC package, a 16-Pin SOIC (wide) package and requires no external components. Watchdog Watchdog TD Timebase Timer ST Select Package Types 8-Pin PDIP 8-Pin SOIC 16-Pin SOIC (Wide) NC 1 16 NC V V PB RST18 PB RST1818 CC CC PB RST 2 15 VCC TD27 ST TD27 ST TTCC12321232 NC 3 14 NC TC1232 TOL3636 RST TOL36 RST TD 4 13 ST TC1232 GND4545 RST NC 5 12 NC GND 4 5 RST TOL 6 11 RST NC 7 10 NC GND 8 9 RST Device Features RST pin RST pin Minimum WDI Input Trip Points Reset MR Device Typical Pull-up Active Active (Max) Active Time Input Type Type Timeouts (ms) Resistor Level Level (ms) TC1232 Open-drain External Low Push-pull High 4.75V 250 150, 600 or Yes or 4.5V 1200 2002-2014 Microchip Technology Inc. DS20001370E-page 1TC1232 Stresses above those listed underAbsolute Maximum 1.0 ELECTRICAL Rating may cause permanent damage to the device. These CHARACTERISTICS are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the Absolute Maximum Ratings operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for Voltage on Any Pin (With Respect to GND) extended periods may affect device reliability..................................................... -0.3V to +5.8V Operating Temperature Range: C-Version ........................................0C to +70C E-Version......................................-40C to +85C Storage Temperature Range: ............-65C to +150C DC CHARACTERISTICS Electrical Specifications: Unless otherwise noted, T = T to T V = +4.0V to 5.5V. A MIN MAX CC Parameters Sym. Min. Typ. Max. Units Conditions Supply Voltage V 4.0 5.0 5.5 V CC ST and PB RST Input High Level V 2.0 V +0.3 V Note 1 IH CC ST and PB RST Input Low Level V -0.3 +0.8 V IL Input Leakage ST, TOL I -1.0 +1.0 A L Output Current RST I -1.0 -12 mA V = 2.4V OH OH Current RST, RST I 2.0 10 mA V = 0.4V OL OL Operating Current I 50 200 A Note 2 CC V 5% Trip Point V 4.50 4.62 4.74 V TOL = GND (Note 3) CC CCTP V 10% Trip Point V 4.25 4.37 4.49 V TOL = V (Note 3) CC CCTP CC Capacitance Electrical Characteristics: Unless otherwise noted, T = +25C. (Note 4) A Input Capacitance ST, TOL C 5 pF IN Output Capacitance RST, RST C 7 pF OUT Note 1: PB RST is internally pulled up to V with an internal impedance of typically 40 k . CC 2: Measured with outputs open. 3: All voltages referenced to GND. 4: Ensured by design. DS20001370E-page 2 2002-2014 Microchip Technology Inc.