Pin Number

IMP706P

IMP706R/S/T/J IMP708R/S/T/J

DIP/SO MicroSO DIP/SO MicroSO DIP/SO MicroSO Name

Function

Manual reset input. The active LOW input triggers

a reset pulse. It is pulled HIGH by a 20k

Ω pull-up

1

3

1

3

1

3

MR

resistor. It is compatible with TTL/CMOS signals

through a mechanical switch. Leave floating or

2

424

2

4

Monitored power supply input.

3

5

3

5

3

5

GND

Ground

Power-fail input voltage monitor. With PFI less than

4

6

4

6

4

6

PFI

1.25V, PFO goes LOW. Connect PFI to ground

when not used.

Power-fail output. The output is active LOW and

5

7

5

7

5

7

PFO

sinks current when PFI is less than 1.25V. If not

used, leave the pin unconnected.

Watchdog input. WDI controls the internal watchdog

timer. A HIGH or LOW signal for 1.6 sec at WDI

allows the internal timer to run-out, setting WDO low.

6

868

——

WDI

A rising or falling edge must occur at WDI within

1.6 seconds or WDO goes LOW. The watchdog

function is disabled by floating WDI. The internal

watchdog timer clears when: RESET is asserted;

WDI is three-stated; or WDI sees a rising or falling edge.

—

———

6

8

NC

Not connected.

Active-LOW reset output. Pulses LOW for 200ms

——

7

1

7

1

RESET

below the reset threshold. RESET remains LOW for

or MR goes from HIGH to LOW. A watchdog timeout

will not trigger RESET unless WDO is connected to MR.

Watchdog output. WDO goes LOW when the 1.6

second internal watchdog timer times-out and does

not go HIGH until a transition occurs at WDI. In

8

282

——

WDO

WDO goes LOW. Unlike RESET, WDO does not have

the reset threshold, WDO becomes HIGH with no delay.

71

——

8

2

RESET

Active-HIGH reset output. RESET is the inverse of

RESET.

IMP706P/R/S/T/J, IMP708R/S/T/J

IMP706P/R/S/T/J, IMP708R/S/T/J

Pin Descriptions

Feature Summary

©

1999 IMP, Inc.

408-432-9100/www.impweb.com

5

IMP706P IMP706R IMP706S IMP706T IMP706J IMP708R IMP708S IMP708T IMP708J

Power-fail detector

III

I

I

I

I

I

I

Brownout detection

III

I

I

I

I

I

I

Debounced manual RESET input

III

I

I

I

I

I

I

Power-up/down RESET

III

I

I

I

I

I

I

Watchdog timer

III

I

I

Active-HIGH RESET

I

Active-LOW RESET

II

I

I

Active-LOW and HIGH RESETs

II

I

I

RESET threshold

2.63V

2.63V

2.93V

3.08V

4.00V

2.63V

2.93V

3.08V

4.00V