EM MICROELECTRONIC-MARIN SA
H6061
3 V Self Recovering Watchdog
Features
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Watchdog fully operational from 2.7 to 5.25 V
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Regulated DC voltage monitor, internal voltage
reference
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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
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Standard timeout period and power-on reset time
(100 ms), externally programmable from 3 ms to
3 mins if required
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Works down to 1.6 V supply voltage
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Low voltage alarm prior to reset on power-down
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Reset outputs of both polarities
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Open drain outputs
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Small footprint SO8 and DIP8 packages
Typical Operating Configuration
5V
H6061
V
DD
V
IN
RES
TCL SAVE
RES
V
SS
NMI
碌P
RES
I/O
GND
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
perfomance for fast-rise supply lines.
Fig. 1
Pin Assignment
DIP8 / SO8
Applications
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n
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n
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Microprocessor and microcontroller systems
Point of sales equipment
Telecom products
Automotive subsystems
Microcontroller 68HC05 applications
V
IN
TCL
RC
V
SS
H6061
V
DD
RES
SAVE
RES
Fig. 2
1