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ADM708TAN Datasheet(PDF) 1 Page - Analog Devices

Part # ADM708TAN
Description  3 V, Voltage Monitoring Microprocessor Supervisory Circuits
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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3 V, Voltage Monitoring
Microprocessor Supervisory Circuits
ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©1995–2008 Analog Devices, Inc. All rights reserved.
FEATURES
Precision supply voltage monitor
2.63 V (ADM706P, ADM706R, ADM708R)
2.93 V (ADM706S, ADM708S)
3.08 V (ADM706T, ADM708T)
100 μA quiescent current
200 ms reset pulse width
Debounced manual reset input (MR)
Independent watchdog timer
1.6 second timeout (ADM706x)
Reset output
Active high (ADM706P)
Active low (ADM706R, ADM706S, ADM706T)
Both active high and active low (ADM708R, ADM708S,
ADM708T)
Voltage monitor for power-fail or low battery warning
Guaranteed RESET valid with VCC = 1 V
Superior upgrade for MAX706P/R/S/T, MAX708R/S/T
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Critical microprocessor monitoring
Battery-operated systems
Portable instruments
FUNCTIONAL BLOCK DIAGRAMS
WATCHDOG
TRANSITION
DETECTOR
WATCHDOG
INPUT (WDI)
POWER-FAIL
INPUT (PFI)
POWER-FAIL
OUTPUT (PFO)
WATCHDOG
OUTPUT (WDO)
RESET,
(P = RESET)
*VOLTAGE REFERENCE = 2.63V (P/R), 2.93V (S), 3.08V (T)
ADM706P/ADM706R/
ADM706S/ADM706T
WATCHDOG
TIMER
RESET AND
WATCHDOG
TIMEBASE
RESET
GENERATOR
MR
VCC
70μA
VCC
VREF*
1.25V
Figure 1. ADM706P/ADM706R/ADM706S/ADM706T
1.25V
INPUT (PFI)
* VOLTAGE REFERENCE = 2.63V (R), 2.93V (S), 3.08V (T)
POWER-FAIL
RESET
RESET
GENERATOR
MR
VCC
70μA
VCC
RESET
VREF*
POWER-FAIL
OUTPUT (PFO)
ADM708R/ADM708S/
ADM708T
Figure 2. ADM708R/ADM708S/ADM708T
GENERAL DESCRIPTION
The ADM706P/ADM706R/ADM706S/ADM706T and the
ADM708R/ADM708S/ADM708T microprocessor supervisory
circuits are suitable for monitoring either 3 V or 3.3 V power
supplies.
The ADM706P/ADM706R/ADM706S/ADM706T provide
power-supply monitoring circuitry that generate a reset output
during power-up, power-down, and brownout conditions. The
reset output remains operational with VCC as low as 1 V.
Independent watchdog monitoring circuitry is also provided.
This is activated if the watchdog input has not been toggled
within 1.6 seconds.
In addition, there is a 1.25 V threshold detector for power-fail
warning, low battery detection, or to monitor an additional power
supply. An active low debounced MR input is also included.
The ADM706R, ADM706S, and ADM706T are identical except
for the reset threshold monitor levels, which are 2.63 V, 2.93 V, and
3.08 V, respectively. The ADM706P is identical to the ADM706R in
that the reset threshold is 2.63 V. It differs only in that it has an
active high reset output.
The ADM708R/ADM708S/ADM708T provide similar functio-
nality as the ADM706R/ADM706S/ADM706T and only differ
in that a watchdog timer function is not available. Instead, an
active high reset output (RESET) is provided in addition to the
active low (RESET) output.
All parts are available in narrow 8-lead PDIP and 8-lead SOIC
packages.


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