HN705/HN706
APPLICATION INFORMATION
Ensuring That RESET is Valid Down to V
CC
= 0V
When V
CC
falls below 1.1V, the HN705/706 RESET
output no longer pulls down; it becomes indeterminate.
To avoid the possibility that stray charges build up and
force RESET to the wrong state, a pull-down resistor
should be connected to the RESET pin, thus draining
such charges to ground and holding RESET low. The
resistor value is not critical. A 100k resistor will pull
RESET to ground without loading it.
Bi-directional Reset Pin Interfacing
The HN705/706 can interface with µP/µC bi-directional
reset pins by connecting a 4.7k resistor in series with
the RESET output and the µP / µC bi-directional RESET
pin.
BUF
Buffered
RESET
V
CC
< 1.1V
V
CC
V
CC
HN70x
100k
9
RESET
GND
Power
Supply
HN70x
4.7kΩ
RESET
GND
Bi-directional I/O Pin
µC
or
µP
RESET
Input
GND
Figure 3. Ensuring That RESET is Valid Down to V
CC
= 0V
Figure 4. Bi-directional Reset Pin Interfacing
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座
4004
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ADD.: RM. 4004,
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HN [ NANJING HONANO ELECTRONIC CO., LTD. ]
