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DATASHEET
Radiation Hardened, 5.0V/3.3V µ-Processor
Supervisory Circuits
ISL705AEH, ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH,
ISL706CEH, ISL705ARH, ISL705BRH, ISL705CRH, ISL706ARH,
ISL706BRH, ISL706CRH
The devices in this family 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.
• A reset output during power-up, power-down, and brownout
conditions.
• An independent watchdog output that goes low if the
watchdog input has not been toggled within 1.6s.
• A precision threshold detector for monitoring a power supply
other than VDD.
• An active-low, manual-reset input.
Applications
• Supervisor for µ-processors, µ-controllers, FPGAs, and DSPs
• Critical power supply monitoring
• Reliable replacement of discrete solutions
Related Literature
• For a full list of related documents, visit our website
- ISL705AEH, ISL705BEH, ISL705CEH, ISL705ARH,
ISL705BRH, ISL705CRH, ISL706AEH, ISL706BEH,
ISL706CEH, ISL706ARH, ISL706BRH, ISL706CRH
product pages
Features
• Electrically screened to SMD 5962-11213
• QML qualified per MIL-PRF-38535 requirements
• Radiation hardness
- High dose rate (EH and RH) . . . . . . . . . . . . . . . 100krad(Si)
- Low dose rate (EH only) . . . . . . . . . . . . . . . .100krad(Si) (*)
- SEL/SEB LETTH. . . . . . . . . . . . . . . . . . . . . 86MeV•cm2/mg
*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.
• Precision supply voltage monitor
- 4.65V threshold in the ISL705AxH/BxH/CxH
- 3.08V threshold in the ISL706AxH/BxH/CxH
• 200ms (typical) reset pulse width
- Active high, active low, and open-drain options
• Independent watchdog timer with 1.6s (typical) timeout
• Precision threshold detector
- 1.25V threshold in the ISL705AxH/BxH/CxH
- 0.6V threshold in the ISL706AxH/BxH/CxH
• Debounced TTL/CMOS compatible manual-reset input
• Reset output valid at VDD = 1.2V
5V POWER SUPPLY
VCC
1 MR
WDO 8
NMI
165k
2 VDD
3 GND
RST 7
WDI 6
RST µP
I/O
4 PFI
PFO 5
49.9k
ISL705AxH
5V SUPERVISOR APPLICATION WITH OVERVOLTAGE PROTECTION
FIGURE 1. TYPICAL APPLICATION
1.4
1.2
1.0 ISL705xxH
0.8
0.6
0.4 ISL706xxH
0.2
0
-80 -60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
FIGURE 2. PRECISION THRESHOLD DETECTOR TEMPERATURE
CHARACTERISTICS CURVE
February 21, 2017
FN7662.5
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC 2011, 2014, 2015, 2016, 2017. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.

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ISL705AEH, ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH, ISL706CEH,
ISL705ARH, ISL705BRH, ISL705CRH, ISL706ARH, ISL706BRH, ISL706CRH
Ordering Information
ORDERING SMD NUMBER
(Note 1)
5962R1121307VXC
5962R1121307V9A
N/A
N/A
5962R1121301QXC
5962R1121301VXC
5962R1121301V9A
5962R1121308VXC
5962R1121308V9A
N/A
N/A
5962R1121302QXC
5962R1121302VXC
5962R1121302V9A
5962R1121309VXC
5962R1121309V9A
N/A
N/A
5962R1121303QXC
5962R1121303VXC
5962R1121303V9A
5962R1121310VXC
5962R1121310V9A
N/A
N/A
5962R1121304QXC
5962R1121304VXC
5962R1121304V9A
5962R1121311VXC
5962R1121311V9A
N/A
N/A
5962R1121305QXC
5962R1121305VXC
5962R1121305V9A
5962R1121312VXC
5962R1121312V9A
N/A
N/A
PART NUMBER
(Note 2)
ISL705AEHVF
ISL705AEHVX
ISL705ARHF/PROTO (Note 3)
ISL705ARHX/SAMPLE (Note 3)
ISL705ARHQF
ISL705ARHVF
ISL705ARHVX
ISL705BEHVF
ISL705BEHVX
ISL705BRHF/PROTO (Note 3)
ISL705BRHX/SAMPLE (Note 3)
ISL705BRHQF
ISL705BRHVF
ISL705BRHVX
ISL705CEHVF
ISL705CEHVX
ISL705CRHF/PROTO (Note 3)
ISL705CRHX/SAMPLE (Note 3)
ISL705CRHQF
ISL705CRHVF
ISL705CRHVX
ISL706AEHVF
ISL706AEHVX
ISL706ARHF/PROTO (Note 3)
ISL706ARHX/SAMPLE (Note 3)
ISL706ARHQF
ISL706ARHVF
ISL706ARHVX
ISL706BEHVF
ISL706BEHVX
ISL706BRHF/PROTO (Note 3)
ISL706BRHX/SAMPLE (Note 3)
ISL706BRHQF
ISL706BRHVF
ISL706BRHVX
ISL706CEHVF
ISL706CEHVX
ISL706CRHF/PROTO (Note 3)
ISL706CRHX/SAMPLE (Note 3)
TEMP RANGE
(°C)
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
PACKAGE
(RoHS COMPLIANT)
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flapack
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flapack
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
PKG. DWG. #
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
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ISL705AEH, ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH, ISL706CEH,
ISL705ARH, ISL705BRH, ISL705CRH, ISL706ARH, ISL706BRH, ISL706CRH
Ordering Information (Continued)
ORDERING SMD NUMBER
(Note 1)
PART NUMBER
(Note 2)
TEMP RANGE
(°C)
PACKAGE
(RoHS COMPLIANT)
PKG. DWG. #
5962R1121306QXC
ISL706CRHQF
-55 to +125
8 Ld Flatpack
K8.A
5962R1121306VXC
ISL706CRHVF
-55 to +125
8 Ld Flatpack
K8.A
5962R1121306V9A
ISL706CRHVX
-55 to +125
Die
N/A ISL705XRHEVAL1Z (Note 4) ISL705XRH Evaluation Board
N/A ISL706XRHEVAL1Z (Note 4) ISL706XRH Evaluation Board
NOTE:
1. Specifications for Rad Hard QML devices are controlled by the Defense Logistics Agency Land and Maritime (DLA). The SMD numbers listed must be
used when ordering.
2. These Intersil Pb-free Hermetic packaged products employ 100% Au plate - e4 termination finish, which is RoHS compliant and compatible with both
SnPb and Pb-free soldering operations.
3. The /PROTO and /SAMPLE are not rated or certified for Total Ionizing Dose (TID) or Single Event Effect (SEE) immunity. These parts are intended for
engineering evaluation purposes only. The /PROTO parts meet the electrical limits and conditions across the temperature range specified in the DLA
SMD and are in the same form and fit as the qualified device. The /SAMPLE die is capable of meeting the electrical limits and conditions specified
in the DLA SMD at +25°C only. The /SAMPLE is a die and does not receive 100% screening across the temperature range to the DLA SMD electrical
limits. These part types do not come with a certificate of conformance because there is no radiation assurance testing and they are not DLA qualified
devices.
4. Evaluation board uses the /PROTO parts. The /PROTO parts are not rated or certified for Total Ionizing Dose (TID) or Single Event Effect (SEE) immunity.
Pin Configurations
ISL705AxH, ISL706AxH
(8 LD FLATPACK)
TOP VIEW
ISL705BxH, ISL706BxH
(8 LD FLATPACK)
TOP VIEW
ISL705CxH, ISL706CxH
(8 LD FLATPACK)
TOP VIEW
MR 1
VDD 2
GND 3
PFI 4
8 WDO
7 RST
6 WDI
5 PFO
MR 1
VDD 2
GND 3
PFI 4
8 WDO
7 RST
6 WDI
5 PFO
MR 1
VDD 2
GND 3
PFI 4
8 WDO
7 RST_OD
6 WDI
5 PFO
Pin Descriptions
ISL705AxH
ISL706AxH
1
ISL705BxH
ISL706BxH
1
ISL705CxH
ISL706CxH
1
222
333
444
555
PIN
NAME
MR
VDD
GND
PFI
PFO
DESCRIPTION
Manual Reset. MR is an active-low, debounced, TTL/CMOS compatible input that can
be used to trigger a reset pulse.
Power Supply. VDD is a supply voltage input that provides power to all internal circuitry.
This input is also monitored and used to trigger a reset pulse. Reset is guaranteed
operable after VDD rises above 1.2V.
Ground. GND is a supply voltage return for all internal circuitry. This return establishes
the reference level for voltage detection and should be connected to signal ground.
Power Fail Input. PFI is an input to a threshold detector, which can be used to monitor
another supply voltage level. The threshold of the detector (VPFI) is 1.25V in the
ISL705AxH/BxH/CxH and 0.6V in the ISL706AxH/BxH/CxH.
Power Fail Output. PFO is an active-low, push-pull output of a threshold detector that
indicates the voltage at the PFI pin is less than VPFI.
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ISL705AEH, ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH, ISL706CEH,
ISL705ARH, ISL705BRH, ISL705CRH, ISL706ARH, ISL706BRH, ISL706CRH
Pin Descriptions (Continued)
ISL705AxH
ISL706AxH
6
ISL705BxH
ISL706BxH
6
ISL705CxH
ISL706CxH
6
7- -
-7-
- -7
888
PIN
NAME
DESCRIPTION
WDI Watchdog Input. WDI is a tri-state input that monitors microprocessor activity. If the
microprocessor does not toggle WDI within 1.6s and WDI is not tri-stated, WDO goes
low. As long as reset is asserted or WDI is tri-stated, the watchdog timer will stay
cleared and will not count. As soon as reset is released and WDI is driven high or low,
the timer will start counting. Floating WDI or connecting WDI to a high impedance
tri-state buffer disables the watchdog feature.
RST Reset. RST is an active-low, push-pull output that is guaranteed to be low after VDD
reaches 1.2V. As VDD rises, RST stays low. When VDD rises above a 4.65V
(ISL705AxH/BxH/CxH) or 3.08V (ISL706AxH/BxH/CxH) reset threshold, an internal
timer releases RST after about 200ms. RST pulses low whenever VDD goes below the
reset threshold. If a brownout condition occurs in the middle of a previously initiated
reset pulse, the pulse will continue for at least 140ms. On power-down, after VDD falls
below the reset threshold, RST goes low and is guaranteed low until VDD drops below
1.2V.
RST Reset. RST is an active-high, push-pull output. RST is the inverse of RST.
RST_OD Reset. RST_OD is an active-low, open-drain output that goes low when reset is asserted.
This pin can be pulled up to VDD with a resistor consistent with the sink and leakage
current specifications of the output. Behavior is otherwise identical to the RST pin.
WDO
Watchdog Output. WDO is an active-low, push-pull output that goes low if the
microprocessor does not toggle WDI within 1.6s and WDI is not tri-stated. WDO is
usually connected to the non-maskable interrupt input of a microprocessor. When VDD
drops below the reset threshold, WDO will go low whether or not the watchdog timer
has timed out. Reset is simultaneously asserted, thus preventing an interrupt. Since
floating WDI disables the internal timer, WDO goes low only when VDD drops below the
reset threshold, thus functioning as a low line output.
Functional Block Diagrams
VDD
POR
+- VREF
RST
VDD
MR MR
PB
WDI
WDT
WDO
PB
WDI
POR
+- VREF
WDT
RST
VDD
WDO
MR
PB
WDI
POR
+- VREF
WDT
RST_OD
WDO
PFI PF PFO PFI PF PFO PFI PF PFO
+- VREF
GND
+- VREF
GND
+- VREF
GND
FIGURE 3A. ISL705AxH, ISL706AxH
FIGURE 3B. ISL705BxH, ISL706BxH
FIGURE 3. FUNCTIONAL BLOCK DIAGRAMS
FIGURE 3C. ISL705CxH, ISL706CxH
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ISL705AEH, ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH, ISL706CEH,
ISL705ARH, ISL705BRH, ISL705CRH, ISL706ARH, ISL706BRH, ISL706CRH
Timing Diagrams
VDD
VRST
1.2V
MR
>tMR
RST
tRST
tRST
tRST
RST
<tMD
WDI
FIGURE 4. RST, RST, MR TIMING DIAGRAM
VDD
VRST
1.2V
WDI
WDO
<tWD
tRST
<tWD
>tWP
<tWD
no WDI transitions
tWD
RST
FIGURE 5. WATCHDOG TIMING DIAGRAM
tRST
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