1
Rad-Hard, 5.0V/3.3V -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
supply other than VDD.
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 3must be used when ordering.
Applications
Supervisor for -Processors, -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)
- SEL/SEB LETTH. . . . . . . . . . . . . . . . . . . . . . 86MeV/mg/cm2
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
Reset Output Valid at VDD = 1.2V
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
VDD
GND
PFI
WDO
RST
WDI
PFO
P
165k
49.9k
ISL705ARH
5V SUPERVISOR APPLICATION WITH OVERVOLTAGE PROTECTION
NMI
RST
I/O
VCC
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)
V
PF
I(V)
ISL705xRH
ISL706xRH
September 15, 2011
FN7662.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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