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MAX823 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part No. MAX823
Description  5-Pin Microprocessor Supervisory Circuits
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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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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