IMP706 IMP Inc, IMP706 Datasheet - Page 4

• Manufacturer Part Number: IMP706
• Description: LOW-POWER P SUPERVISOR CIRCUITS
• Manufacturer: IMP Inc

4
Power-fail detector
Brownout detection
Manual RESET input
Power-up/down RESET
Watchdog timer
Active-HIGH RESET output
Active-LOW RESET output
RESET threshold
Pin Descriptions
Feature Summary
—
—
1
2
3
4
5
6
7
8
—
—
3
4
5
6
7
8
1
2
—
—
1
2
3
4
5
6
7
8
—
—
—
3
4
5
6
7
1
2
4.65V/4.00V
I
I
I
I
I
I
—
—
1
2
3
4
5
6
8
7
408-432-9100/www.impweb.com
4.40V
—
—
3
4
5
6
7
8
2
1
I
I
I
I
I
I
RESET
RESET
WDO
GND
PFO
WDI
V
MR
PFI
NC
CC
4.65V
I
I
I
I
I
I
Manual RESET input. The active LOW input triggers a reset
pulse. A 250µA pull-up current allows the pin to be driven
by TTL / CMOS logic or shorted to ground with a switch.
+5V power supply input.
Ground reference for all signals.
Power-fail voltage monitor input. With PFI less than
1.25V, PFO goes low. Connect PFI to ground or V
when not used.
Power-fail output. The output is active LOW and sinks
current when PFI is less than 1.25V.
Watchdog input. WDI controls the internal watchdog
timer. A HIGH or LOW signal for 1.6sec at WDI
allows the internal timer to run-out, setting WDO LOW.
The watchdog function is disabled by floating WDI or
by connecting WDI to a high-impedance three-state
buffer. The internal watchdog timer clears when:
RESET is asserted; WDI is three-stated; or WDI sees
a rising or falling edge.
Not connected.
Active-LOW reset output. Pulses LOW for 200ms
when triggered, and stays low whenever V
the reset threshold (IMP705: 4.65V, IMP705J: 4.00V,
IMP706: 4.40V). RESET remains LOW for 200ms
after V
goes from LOW to HIGH. A watchdog timeout will not
trigger RESET unless WDO is connected to MR.
Watchdog output. WDO pulls LOW when the 1.6 sec
internal watchdog timer times-out and does not go
HIGH until the watchdog is cleared. In addition, when
V
Unlike RESET, WDO does not have a minimum pulse
width and as soon as V
threshold, WDO goes HIGH with no delay.
Active-HIGH reset output. RESET is the inverse of
RESET. The IMP813L has only a RESET output.
CC
is below the reset threshold, WDO remains low.
CC
IMP705/6/7/8, 8
IMP705/6/7/8, 8
rises above the RESET threshold or MR
4.40V
I
I
I
I
I
I
CC
exceeds the reset
4.65V
I
I
I
I
I
I
©
CC
1999 IMP, Inc.
is below
1
1
3L
3L
CC