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
supply other than V
DD
.
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.
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)
- SEL/SEB LET
TH
. . . . . . . . . . . . . . . . . . . . 86MeV * cm
2
/mg
• 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
• Reset Output Valid at V
DD
= 1.2V
Applications
• Supervisor for µ-Processors, µ-Controllers, FPGAs and DSPs
• Critical Power Supply Monitoring
• Reliable Replacement of Discrete Solutions
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”
5V POWER SUPPLY
1.4
1.2
V
CC
1.0
V
PFI
(V)
0.8
0.6
0.4
0.2
0
0
25
50
ISL705xEH
1 MR
2 V
DD
165k
3 GND
4 PFI
49.9k
WDO 8
RST 7
WDI 6
PFO
5
NMI
RST
I/O
µP
ISL706xEH
ISL705AEH
5V SUPERVISOR APPLICATION WITH OVERVOLTAGE PROTECTION
75
krad (Si)
100
125
150
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. PRECISION THRESHOLD DETECTOR LOW DOSE
IONIZING CHARACTERISTIC CURVE
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.
March 30, 2012
FN8262.0
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 Inc. 2012. 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.
ISL705AEH, ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH, ISL706CEH
Pin Configurations
ISL705AEH, ISL706AEH
(8 LD FLATPACK)
TOP VIEW
MR
V
DD
GND
PFI
1
2
3
4
8
7
6
5
WDO
RST
WDI
PFO
ISL705BEH, ISL706BEH
(8 LD FLATPACK)
TOP VIEW
MR
V
DD
GND
PFI
1
2
3
4
8
7
6
5
WDO
RST
WDI
PFO
ISL705CEH, ISL706CEH
(8 LD FLATPACK)
TOP VIEW
MR
V
DD
GND
PFI
1
2
3
4
8
7
6
5
WDO
RST_OD
WDI
PFO
Pin Descriptions
ISL705AEH
ISL706AEH
1
2
ISL705BEH
ISL706BEH
1
2
ISL705CEH
ISL706CEH
1
2
NAME
MR
VDD
DESCRIPTION
Manual Reset. MR is an active-low, debounced, TTL/CMOS compatible input that may
be used to trigger a reset pulse.
Power Supply. V
DD
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 V
DD
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 may be used to monitor
another supply voltage level. The threshold of the detector (V
PFI
) is 1.25V in the
ISL705AEH/BEH/CEH and 0.6V in the ISL706AEH/BEH/CEH.
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 V
PFI
.
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.
Reset. RST is an active-low, push-pull output that is guaranteed to be low once V
DD
reaches 1.2V. As V
DD
rises, RST stays low. When V
DD
rises above a 4.65V
(ISL705AEH/BEH/CEH) or 3.08V (ISL706AEH/BEH/CEH) reset threshold, an internal
timer releases RST after about 200ms. RST pulses low whenever V
DD
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, once V
DD
falls
below the reset threshold, RST goes low and is guaranteed low until V
DD
drops below
1.2V.
Reset. RST is an active-high, push-pull output. RST is the inverse of RST.
Reset. RST_OD is an active-low, open-drain output that goes low when reset is asserted.
This pin may be pulled up to V
DD
with a resistor consistent with the sink and leakage
current specifications of the output. Behavior is otherwise identical to the RST pin.
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 V
DD
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 V
DD
drops below the
reset threshold, thus functioning as a low line output.
3
4
3
4
3
4
GND
PFI
5
6
5
6
5
6
PFO
WDI
7
-
-
RST
-
-
7
-
-
7
RST
RST_OD
8
8
8
WDO
2
FN8262.0
March 30, 2012
ISL705AEH, ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH, ISL706CEH
Ordering Information
ORDERING NUMBER
5962R1121307VXC
5962R1121307V9A
ISL705ARHF/PROTO
ISL705ARHX/SAMPLE
5962R1121308VXC
5962R1121308V9A
ISL705BRHF/PROTO
ISL705BRHX/SAMPLE
5962R1121309VXC
5962R1121309V9A
ISL705CRHF/PROTO
ISL705CRHX/SAMPLE
5962R1121310VXC
5962R1121310V9A
ISL706ARHF/PROTO
ISL706ARHX/SAMPLE
5962R1121311VXC
5962R1121311V9A
ISL706BRHF/PROTO
ISL706BRHX/SAMPLE
5962R1121312VXC
5962R1121312V9A
ISL706CRHF/PROTO
ISL706CRHX/SAMPLE
ISL705XRHEVAL1Z
ISL706XRHEVAL1Z
PART NUMBER
ISL705AEHVF (Note 2)
ISL705AEHVX
ISL705ARHF/PROTO (Note 2)
ISL705ARHX/SAMPLE
ISL705BEHVF (Note 2)
ISL705BEHVX
ISL705BRHF/PROTO (Note 2)
ISL705BRHX/SAMPLE
ISL705CEHVF (Note 2)
ISL705CEHVX
ISL705CRHF/PROTO (Note 2)
ISL705CRHX/SAMPLE
ISL706AEHVF (Note 2)
ISL706AEHVX
ISL706ARHF/PROTO (Note 2)
ISL706ARHX/SAMPLE
ISL706BEHVF (Note 2)
ISL706BEHVX
ISL706BRHF/PROTO (Note 2)
ISL706BRHX/SAMPLE
ISL706CEHVF (Note 2)
ISL706CEHVX
ISL706CRHF/PROTO (Note 2)
ISL706CRHX/SAMPLE
ISL705XRH Evaluation Board
ISL706XRH Evaluation Board
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
PACKAGE
(RoHs Compliant)
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
8 Ld Flatpack
Die
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
K8.A
PKG. DWG. #
NOTE:
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
FN8262.0
March 30, 2012
ISL705AEH, ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH, ISL706CEH
Functional Block Diagrams
V
DD
RST
POR
+ V
REF
-
MR
PB
WDO
WDI
WDT
WDI
WDT
MR
PB
WDO
WDI
WDT
+ V
REF
-
MR
PB
WDO
POR
RST
+ V
REF
-
POR
V
DD
V
DD
RST_OD
PFI
+ V
REF
-
PF
GND
PFO
PFI
+ V
REF
-
PF
GND
PFO
PFI
+ V
REF
-
PF
GND
PFO
ISL705AEH, ISL706AEH
ISL705BEH, ISL706BEH
ISL705CEH, ISL706CEH
Timing Diagrams
V
RST
V
DD
1.2V
>t
MR
MR
t
RST
t
RST
t
RST
RST
<t
MD
RST
FIGURE 3. RST, RST, MR AND WDO TIMING DIAGRAM
V
RST
V
DD
1.2V
< t
WD
< t
WD
< t
WD
WDI
t
WD
>t
WP
WDO
t
RST
t
WD
RST
t
RST
FIGURE 4. WATCHDOG TIMING DIAGRAM
4
FN8262.0
March 30, 2012
ISL705AEH, ISL705BEH, ISL705CEH, ISL706AEH, ISL706BEH, ISL706CEH
Absolute Maximum Ratings
Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
Voltage on All Other Inputs . . . . . . . . . . . . . . . . . . . . . . . -0.3V to V
DD
+ 0.3V
ESD Rating
Human Body Model (Tested per MIL-PRF-883 3015.7). . . . . . . . . .3.0kV
Machine Model (Tested per JESD22-A115C) . . . . . . . . . . . . . . . . . . 300V
Charged Device Model (Tested per JESD22-C110D) . . . . . . . . . . . .1.0kV
Latch Up (Tested per JESD-78C) . . . . . . . . . . . . . . . . . . . . . . Class 2, Level A
Thermal Information
Thermal Resistance (Typical)
θ
JA
(°C/W)
θ
JC
(°C/W)
8 Ld Flatpack Package (Notes 3, 4). . . . . .
140
15
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+175°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Recommended Operating Conditions
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-55°C to +125°C
Supply Voltage
ISL705AEH/BEH/CEH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.75V to 5.5V
ISL706AEH/BEH/CEH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.15V to 3.6V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
3.
θ
JA
is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
4. For
θ
JC
, the “case temp” location is the center of the package underside.
Electrical Specifications
Unless otherwise specified V
DD
= 4.75V to 5.5V for the ISL705AEH/BEH/CEH, V
DD
= 3.15V to 3.6V for the
ISL706AEH/BEH/CEH T
A
= -55°C to +125°C. Boldface limits apply over the operating temperature range, -55°C to +125°C; over a total ionizing dose of
100krad(Si) with exposure at a high dose rate of 50 - 300krad(Si)/s; and over a total ionizing dose of 50krad(Si) with exposure at a low dose rate of
<10mrad(Si)/s.
SYMBOL
POWER SUPPLY SECTION
V
DD
Operating Supply Voltage (Note 7)
ISL705AEH/BEH/CEH
ISL706AEH/BEH/CEH
I
DD
Operating Supply Current
ISL705AEH/BEH/CEH
ISL706AEH/BEH/CEH
RESET SECTION
V
RST
Reset Threshold Voltage
ISL705AEH/BEH/CEH
ISL706AEH/BEH/CEH
V
HYS
Reset Threshold Voltage Hysteresis
ISL705AEH/BEH/CEH
ISL706AEH/BEH/CEH
t
RST
V
OUT
Reset Pulse Width
Reset Output Voltage
ISL705AEH/BEH, I
SOURCE
= 800µA
ISL705AEH/BEH/CEH, I
SINK
= 3.2mA
ISL706AEH/BEH, I
SOURCE
= 500µA
ISL706AEH/BEH/CEH, I
SINK
= 1.2mA
ISL70XAEH/CEH, V
DD
= 1.2V, I
SINK
= 100µA
ISL70XBEH, V
DD
= 1.2V, I
SOURCE
= 4µA
I
LEAK
Reset Output Leakage Current
ISL705CEH, V
OUT
= V
DD
ISL706CEH, V
OUT
= V
DD
0.9
1
1
0.8 x V
DD
0.3
0.3
4.50
3.00
20
20
140
V
DD
- 1.5
0.4
4.65
3.08
40
30
200
280
4.75
3.15
V
V
mV
mV
ms
V
V
V
V
V
V
µA
µA
1.2
1.2
5
3.3
5.5
3.6
530
400
V
V
µA
µA
PARAMETER
CONDITIONS
MIN
(Note 5)
TYP
MAX
(Note 6) (Note 5) UNITS
5
FN8262.0
March 30, 2012
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