imp706resa A1 PROs co., Ltd., imp706resa Datasheet - Page 7

• Manufacturer Part Number: imp706resa
• Description: 3/3.3/4.0v ?p Supervisor Circuits
• Manufacturer: A1 PROs co., Ltd.

Bi-directional Reset Pin Interfacing
The IMP706/8 can interface with P/ C bi-directional reset pins
by connecting a 4.7k
and the P/ C bi-directional reset pin.
©
Voltage
Supply
1999 IMP, Inc.
IMP70x
GND
V
CC
RESET
resistor in series with the RESET output
4.7k
Bi-directional I/O Pin
(Example: 68HC11)
RESET
Input
BUF
C or P
GND
408-432-9100/www.impweb.com
Buffered
RESET
IMP706P/R/S/T/J, IMP708R/S/T/J
706P_06.eps
IMP706P/R/S/T/J, IMP708R/S/T/J
Ensuring That RESET is Valid Down to V
When V
IMP708R/S/T/J RESET reset outputs no longer pull down; it
becomes indeterminate. To avoid the possibility that stray charges
could 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. The resistor value is not critical. A 100k resis-
tor will pull RESET to ground without loading it.
Monitoring Voltages Other Than V
The IMP706/708 can monitor voltages other than V
Power Fail circuitry. If a resistive divider is connected from the
voltage to be monitored to the PFI input, the PFO (output) will go
LOW if the divider voltage goes below its 1.25V reference. Should
hysteresis be desired, connect a resistor (equal to approximately
10 times the sum of the two resistors in the divider) between the
PFI and PFO pins. A capacitor between PFI and GND will reduce
circuit sensitivity to input high frequency noise. If it is desired to
assert a reset in addition to the PFO flag, this may be achieved by
connecting the PFO output to MR.
CC
falls below 1.2V, the IMP706R/S/T/J and
Application Information
CC
CC
CC
= 0V
using the
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