1

TM

FN4703.4

IS-705RH

Radiation Hardened Power-Up/Down

Microprocessor Reset Circuit

The Radiation Hardened IS-705RH is

a monolithic device that monitors the

power supply voltage used by

satellite control units and provides a

reset output pulse during power-up and power-down. The

reset threshold is 4.65V (Typ) and the reset pulse width is set

at 200ms (Typ). A watchdog circuit is incorporated for easy

interfacing with microprocessors and controllers. If the

watchdog input has not been toggled within a preset

1.6s (Typ) time period, an output signal is generated, which

can be used as an interupt. The power function input (PFI)

may be used to monitor other voltage levels. The circuit has a

1.25V (Typ) threshold and provides a PFO output when low

voltage is detected. An active-low manual reset input in also

provided for direct control of the reset function.

Constructed with the Intersil UHF2X-CMOS process, these

devices have been specifically designed to provide highly

reliable performance in harsh radiation environments. This

process has been tested for single event latch-up and has

Specifications for Rad Hard QML devices are controlled

by the Defense Supply Center in Columbus (DSCC). The

SMD numbers listed here must be used when ordering.

Detailed Electrical Specifications for these devices are

contained in SMD 5962-00538. A “hot-link” is provided

on our homepage for downloading.

Pinout

IS9-705RH

FLATPACK

TOP VIEW

Features

• Electrically Screened to SMD # 5962-00538

• QML Qualified per MIL-PRF-38535 Requirements

• Radiation Hardness

- Total Dose. . . . . . . . . . . . . . . . . . . . . 100 krad(Si) (Max)

• Precision 4.65V Voltage Monitor

• Wide Operating Supply Range . . . . . . . . . . . 1.2V to 5.5V

• Low Supply Current . . . . . . . . . . . . . . . . . . . . 420

µA (Typ)

• 200ms (Typ) RESET Pulse Width

Applications

• Flight Computers

• Controllers

• Critical Microprocessor Power Monitoring

• Reliable Replacement of Discrete Solutions

TM

MR

GND

PFI

1

2

3

4

8

7

6

5

WDO

RESET

WDI

PFO

Ordering Information

ORDERING NUMBER

INTERNAL

MKT. NUMBER

TEMP. RANGE

5962R0053801QXC

IS9-705RH-8

-55 to 125

5962R0053801VXC

IS9-705RH-Q

-55 to 125

5962R0053801V9A

IS0-705RH-Q

-55 to 125

IS9-705RH/Proto

IS9-705RH/Proto

-55 to 125

Data Sheet

December 2001

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2001. All Rights Reserved

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