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ADM705 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM705
Beschreibung Low Cost uP Supervisory Circuits
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 8 Seiten
ADM705 Datasheet, Funktion
a
FEATURES
Guaranteed RESET Valid with VCC = 1 V
190 A Quiescent Current
Precision Supply-Voltage Monitor
4.65 V (ADM705/ADM707)
4.40 V (ADM706/ADM708)
200 ms Reset Pulsewidth
Debounced TTL/CMOS Manual Reset Input (MR)
Independent Watchdog Timer—1.6 sec Timeout
(ADM705/ADM706)
Active High Reset Output (ADM707/ADM708)
Voltage Monitor for Power-Fail or Low Battery
Warning
Superior Upgrade for MAX705–MAX708
Also Available in MicroSOIC Packages
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Critical P Monitoring
Automotive Systems
Critical P Power Monitoring
GENERAL DESCRIPTION
The ADM705–ADM708 are low cost µP supervisory circuits.
They are suitable for monitoring the 5 V power supply/battery
and can also monitor microprocessor activity.
The ADM705/ADM706 provide the following functions:
1. Power-On Reset output during power-up, power-down and
brownout conditions. The RESET output remains opera-
tional with VCC as low as 1 V.
2. Independent watchdog timeout, WDO, that goes low if the
watchdog input has not been toggled within 1.6 seconds.
3. A 1.25 V threshold detector for power-fail warning, low
battery detection or to monitor a power supply other than
5 V.
4. An active low debounced manual reset input (MR).
The ADM707/ADM708 differ in that:
1. A watchdog timer function is not available.
2. An active high reset output in addition to the active low
output is available.
Low Cost P
Supervisory Circuits
ADM705–ADM708
FUNCTIONAL BLOCK DIAGRAMS
WATCHDOG
INPUT (WDI)
WATCHDOG
TRANSITION
DETECTOR
WATCHDOG
TIMER
WATCHDOG
OUTPUT (WDO)
VCC
250A
MR
VCC
POWER-FAIL
INPUT (PFI)
4.65V*
1.25V
RESET &
WATCHDOG
TIMEBASE
RESET
GENERATOR
ADM705/
ADM706
RESET
POWER-FAIL
OUTPUT (PFO)
*VOLTAGE REFERENCE = 4.65V (ADM705), 4.40V (ADM706)
VCC
250A
MR
VCC
POWER-FAIL
INPUT (PFI)
4.65V*
1.25V
RESET
GENERATOR
ADM707/
ADM708
RESET
RESET
POWER-FAIL
OUTPUT (PFO)
*VOLTAGE REFERENCE = 4.65V (ADM707), 4.40V (ADM708)
Two supply-voltage monitor levels are available. The ADM705/
ADM707 generate a reset when the supply voltage falls below
4.65 V, while the ADM706/ADM708 require that the supply
fall below 4.40 V before a reset is issued.
All parts are available in 8-lead DIP and SOIC packages. The
ADM707 and ADM708 are also available in space-saving
microSOIC packages.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000






ADM705 Datasheet, Funktion
ADM705–ADM708–Typical Performance Characteristics
A!
VCC
100
90
4.50V
10
0%
RESET
1V
1V
500msHo
Figure 8. RESET Output Voltage vs. Supply Voltage
VCC = 5V
TA = 25؇C
1.2V
1.3V
PFI
PFO
0V
4.4V
500ns/DIV
Figure 11. PFI Comparator Deassertion Response Time
A1
VCC 100
90
RESET
4.50V
10
0%
1V
1V
500msHo
Figure 9. ADM707/ADM708 RESET Output Voltage vs.
Supply Voltage
1.3V
PFI
VCC = 5V
TA = 25؇C
1.2V
5V
PFO
0V
500ns/DIV
Figure 10. PFI Comparator Assertion Response Time
VCC = VRT
TA = 25؇C
5V
RESET
RESET
5V
0V
0V
100ns/DIV
Figure 12. RESET, RESET Assertion
5V
RESET
VCC = VRT
TA = 25؇C
RESET
5V
0V
0V
100ns/DIV
Figure 13. RESET, RESET Deassertion
–6– REV. B

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