R
EM MICROELECTRONIC -
MARIN SA
H6061
3V Self Recovering Watchdog
Description
The H6061 is a combined initialiser, watchdog and voltage
monitor. The circuit is a low voltage low power monolithic
CMOS device combining a series of voltage comparators
and a programmable timer on the same chip. The device is
specially suited to telecommunications applications where 3
V working is expected, for functions such as supply voltage
and microprocessor monitoring. The reset outputs are self
recovering after a watchdog timeout, enabling the circuit to
work with standalone systems without any external push-
switch or control signal to restart after a watchdog timeout.
The circuit provides a reset signal of both polarities. The
state of the outputs is defined down to 1.6 V. An internal
debouncer ensures power-up performance for fast-rise
supply lines.
Features
Watchdog fully operational from 2.7 to 5.25 V
Regulated DC voltage monitor, internal voltage
reference
Self recovering watchdog function: reset goes active
after the 1st timeout period, reset goes inactive again
after the 2nd timeout period, repeated active reset signal
until the system recovers
Standard timeout period and power-on reset time
(100 ms), externally programmable from 3 ms to 3 mins
if required
Works down to 1.6 V supply voltage
Low voltage alarm prior to reset on power-down
Reset outputs of both polarities
Open drain outputs
SO8 package
Applications
Microprocessor and microcontroller systems
Point of sales equipment
Telecom products
Automotive subsystems
Microcontroller 68HC05 applications
Typical Operating Configuration
5V
Pin Assignment
H6061
V
IN
TCL
V
SS
V
DD
RES
SAVE
RES
NMI
RES
I/O
P
GND
Fig. 1
Fig. 2
Copyright © 2004, EM Microelectronic-Marin SA
1
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