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ADM8691ANZ Datasheet PDF : 24 Pages
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Data Sheet
FEATURES
Upgrade for the ADM690, ADM691, ADM695 and
for the MAX690, MAX691, MAX695
Specified over temperature
Low power consumption: 0.7 mW
Precision voltage monitor
Reset assertion down to 1 V VCC
Low switch on resistance: 0.7 Ω normal, 7 Ω in backup
High current drive: 100 mA
Watchdog timer: 100 ms, 1.6 sec, or adjustable
Standby current: 400 nA
Automatic battery backup power switching
Extremely fast gating of chip enable signals (3 ns)
Voltage monitor for power fail
Available in TSSOP package
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Automotive systems
PRODUCT HIGHLIGHTS
The ADM8690 is available in 8-lead PDIP and SOIC packages
and provides the following functions:
1. Power-on reset output during power-up, power-down,
and brownout conditions. The RESET output remains
operational with VCC as low as 1 V.
2. Battery backup switching for CMOS RAM, CMOS micro-
processor, or other low power logic.
3. Reset pulse if the optional watchdog timer is not toggled
within a specified time.
4. 1.3 V threshold detector for power-fail warning, low battery
detection, or to monitor a power supply other than 5 V.
The ADM8691 and ADM8695 are available in 16-lead PDIP
and small outline packages (including TSSOP) and provide
three additional functions:
1. Write protection of CMOS RAM or EEPROM.
2. Adjustable reset and watchdog timeout periods.
3. Separate watchdog timeout, backup battery switchover, and
low VCC status outputs.
Microprocessor
Supervisory Circuits
ADM8690/ADM8691/ADM8695
FUNCTIONAL BLOCK DIAGRAMS
VBATT
VCC
4.65V1
RESET
GENERATOR 2
VOUT
RESET
WATCHDOG
INPUT (WDI)
POWER-FAIL
INPUT (PFI)
WATCHDOG
TRANSITION DETECTOR
(1.6sec)
ADM8690
1.3V
POWER-FAIL
OUTPUT (PFO)
1VOLTAGE DETECTOR = 4.65V
2RESET PULSE WIDTH = 50ms
Figure 1. ADM8690
VBATT
BATT ON
ADM8691/
ADM8695
VOUT
VCC
CEIN
4.65V1
OSC IN
OSC SEL
RESET AND
WATCHDOG
TIME BASE
RESET
GENERATOR
CEOUT
LOW LINE
RESET
RESET
WATCHDOG
INPUT (WDI)
POWER-FAIL
INPUT (PFI)
WATCHDOG
TRANSITION DETECTOR
1.3V
WATCHDOG
TIMER
1VOLTAGE DETECTOR = 4.65V
Figure 2. ADM8691/ADM8695
WATCHDOG
OUTPUT (WDO)
POWER-FAIL
OUTPUT (PFO)
Rev. C
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
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