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

ISL705AEH, ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH, ISL706CEH

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 Logistics Agency Land and Maritime (DLA). The SMD

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

must be used when ordering.

Detailed Electrical Specifications for the ISL705AEH,

ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH and

ISL706CEH are contained in SMD 5962-11213. A “hot-link” is

also 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)

- Low Dose Rate . . . . . . . . . . . . . . . . . . . 100krad(Si) (Note 1)

• Precision Supply Voltage Monitor

- 4.65V Threshold in the ISL705AEH/BEH/CEH

- 3.08V Threshold in the ISL706AEH/BEH/CEH

• 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 ISL705AEH/BEH/CEH

- 0.6V Threshold in the ISL706AEH/BEH/CEH

• Debounced TTL/CMOS Compatible Manual-Reset Input

Related Literature

• AN1650, “ISL705XRH Evaluation Board User’s Guide”

• AN1671, “ISL706xRH Evaluation Board User’s Guide”

• AN1651, “Single Event Effects (SEE) Testing of the

ISL705xRH/EH and ISL706xRH/EH Rad Hard Supervisory

Circuits”

NOTE:

1. Product capability established by initial characterization. The EH version is acceptance tested on a wafer by wafer basis to 50krad(Si) at low dose rate.

1

2

3

4

8

7

6

5

MR

GND

PFI

WDO

RST

WDI

PFO

µP

165k

49.9k

ISL705AEH

5V SUPERVISOR APPLICATION WITH OVERVOLTAGE PROTECTION

NMI

RST

I/O

5V POWER SUPPLY

FIGURE 1. TYPICAL APPLICATION

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

0

25

50

75

100

125

150

FIGURE 2. PRECISION THRESHOLD DETECTOR LOW DOSE

IONIZING CHARACTERISTIC CURVE

krad (Si)

ISL705xEH

ISL706xEH

March 30, 2012

FN8262.0

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

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