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Rad-Hard, 5.0V/3.3V µ-Processor Supervisory Circuits

ISL705ARH, ISL705BRH, ISL705CRH, ISL706ARH, ISL706BRH, ISL706CRH

This family of devices are radiation hardened 5.0V/3.3V

supervisory circuits that reduce the complexity required to

monitor supply voltages in microprocessor systems. These

devices significantly improve accuracy and reliability relative to

discrete solutions. Each IC provides four key functions.

1. A reset output during power-up, power-down, and brownout

conditions.

2. An independent watchdog output that goes low if the

watchdog input has not been toggled within 1.6s.

3. A precision threshold detector for monitoring a power

4. An active-low manual-reset input.

Specifications for Rad Hard QML devices are controlled by the

Defense Supply Center in Columbus (DSCC). The SMD

numbers listed in the “Ordering Information” table on page 3

must be used when ordering.

Detailed Electrical Specifications for the ISL705ARH,

ISL705BRH, ISL705CRH, ISL706ARH, ISL706BRH and

ISL706CRH are contained in SMD 5962-11213. A “hot-link” is

provided on our website for downloading.

Applications

• Supervisor for µ-Processors, µ-Controllers, FPGAs and DSPs

• Critical Power Supply Monitoring

• Reliable Replacement of Discrete Solutions

Features

• Electrically Screened to SMD 5962-11213

• QML Qualified per MIL-PRF-38535 Requirements

•Radiation Hardness

- High Dose Rate. . . . . . . . . . . . . . . . . . . . . . . . . . 100krad(Si)

• Precision Supply Voltage Monitor

- 4.65V Threshold in the ISL705ARH/BRH/CRH

- 3.08V Threshold in the ISL706ARH/BRH/CRH

• 200ms (Typ) Reset Pulse Width

- Active High, Active Low and Open Drain Options

• Independent Watchdog Timer with 1.6s (Typ) Timeout

• Precision Threshold Detector

- 1.25V Threshold in the ISL705ARH/BRH/CRH

- 0.6V Threshold in the ISL706ARH/BRH/CRH

• Debounced TTL/CMOS Compatible Manual-Reset Input

Related Literature

• ISL705RH Voltage Supervisory Circuit Evaluation Board

User’s Guide

• ISL706RH Voltage Supervisory Circuit Evaluation Board

User’s Guide

FIGURE 1. TYPICAL APPLICATION

1

2

3

4

8

7

6

5

MR

GND

PFI

WDO

RST

WDI

PFO

µP

165k

49.9k

ISL705ARH

5V SUPERVISOR APPLICATION WITH OVERVOLTAGE PROTECTION

NMI

RST

I/O

5V POWER SUPPLY

FIGURE 2. PRECISION THRESHOLD DETECTOR TEMPERATURE

CHARACTERISTICS CURVE

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

-80

-60

-40

-20

0

20

40

60

80

100

120

140

TEMPERATURE (°C)

ISL705xRH

ISL706xRH

September 15, 2011

FN7662.0

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

1-888-INTERSIL or 1-888-468-3774

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