Datasheet

MAX698/MAX699
Low-Cost, Power-On Reset
and Watchdog Controllers
Pin Description
PIN
SO PDIP
NAME FUNCTION
1, 4, 9 3, 4, 8 GND Chip Power Ground
2, 3 1, 2 V
CC
+5V Sense Input and MAX698/MAX699 Chip Power
5–8, 10–14
5, 6 N.C. No Connection
10 6 WDI (MAX699 Only)
(MAX699 Only.) A three-level input. If WDI remains high or low for
more than the watchdog timeout period, RESET pulses low (WDO
also goes low on the MAX699 SO package). If WDI is unconnected,
the watchdog circuit is disabled.
14 — WDO (MAX699 Only)
(MAX699 Only.) Goes low when WDI remains high or low for more
than the watchdog timeout period. WDO is set high at the next WDI
transition. If WDI is unconnected or at midsupply, WDO remains high.
WDO also remains high when V
CC
falls below 4.4V.
15 7 RESET
Goes low when V
CC
falls below internally set threshold (see the
Electrical Characteristics table).
16 — RESET Goes high when V
CC
falls below internally set threshold.
WDI*
WATCHDOG
TIMER
RESET
TIMER
V
CC
V
CC
GND
WDO*
RESET
RESET*
POWER-ON
RESET
4.65V
MAX698
MAX699
*WDI ON MAX699 ONLY
RESET ON SO PACKAGE ONLY
WDO ON SO MAX699 ONLY
Figure 1. Block Diagram
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