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MAX823 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX823 Datasheet(HTML) 5 Page - Maxim Integrated Products |
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5-Pin Microprocessor Supervisory Circuits _______________________________________________________________________________________ 5 ______________________________________________________________Pin Description MAX823 MAX824 MAX825 VCC VCC WDI (MAX823/MAX824 ONLY) 1.25V GND RESET (MAX824/MAX825 ONLY) RESET MR (MAX823/MAX825 ONLY) RESET GENERATOR WATCHDOG TIMER WATCHDOG TRANSITION DETECTOR FUNCTION 1 1 Active-Low Reset Output. Pulses low for 200ms when triggered, and remains low whenever VCC is below the reset threshold or when MR is a logic low. It remains low for 200ms after one of the following occurs: VCC rises above the reset threshold, the watchdog triggers a reset, or MR goes low to high. 2 2 Ground. 0V reference for all signals. 3 — Manual-Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is held low and for 200ms after MR returns high. The active-low input has an internal 52k Ω pull-up resistor. It can be driven from a CMOS-logic line or shorted to ground with a switch. Leave open or connect to VCC if unused. — 3 Active-High Reset Output. Inverse of RESET. 5 5 Supply Voltage 4 4 Watchdog Input. If WDI remains either high or low for longer than the watch- dog timeout period, the internal watchdog timer runs out and a reset is trig- gered. The internal watchdog timer clears whenever reset is asserted, or whenever WDI sees a rising or falling edge. If WDI is left unconnected or is connected to a three-stated buffer output, the watchdog feature is disabled. NAME 1 RESET 2 GND 4 MR 3 RESET 5 VCC — WDI Figure 1. Functional Diagram MAX824 MAX823 MAX825 PIN |
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