ADM8693ANZ Просмотр технического описания (PDF) - Analog Devices
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ADM8693ANZ Datasheet PDF : 20 Pages
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Microprocessor
Supervisory Circuits
ADM8690/ADM8691/ADM8692/ADM8693/ADM8695
FEATURES
Upgrade for ADM690 to ADM695, MAX690 to 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 s, or adjustable
400 nA standby current
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 and ADM8692 are available in 8-lead, PDIP
packages and provide:
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
microprocessor, or other low power logic.
3. A reset pulse if the optional watchdog timer has not been
toggled within a specified time.
4. A 1.3 V threshold detector for power-fail warning, low battery
detection, or to monitor a power supply other than 5 V.
The ADM8691, ADM8693, 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.
FUNCTIONAL BLOCK DIAGRAMS
VBATT
VCC
4.65V1
RESET
GENERATOR2
VOUT
RESET
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI)
WATCHDOG
TRANSITION DETECTOR
(1.6s)
ADM8690/
ADM8692
1.3V
POWER FAIL
OUTPUT (PFO)
1VOLTAGE DETECTOR = 4.65V (ADM8690)
4.40V (ADM8692)
2RESET PULSE WIDTH = 50ms (AD8690, ADM8692)
Figure 1. ADM8690/ADM8692
VBATT
BATT ON
ADM8691/
ADM8693/
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
WATCHDOG
OUTPUT (WDO)
POWER FAIL
OUTPUT (PFO)
1VOLTAGE DETECTOR = 4.65V (ADM8691, ADM8695)
4.40V (ADM8693)
Figure 2. ADM8691/ADM8693/ADM8695
Rev. B
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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