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Analog Devices - Microprocessor Supervisory Circuits

Numéro de référence ADM8697
Description Microprocessor Supervisory Circuits
Fabricant Analog Devices 
Logo Analog Devices 





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Microprocessor
Supervisory Circuits
FEATURES
Upgrade for ADM696/ADM697, MAX696/MAX697
Specified Over Temperature
Adjustable Low Line Voltage Monitor
Power OK/Reset Time Delay
Reset Assertion Down to 1 V VCC
Watchdog Timer—100 ms, 1.6 s, or Adjustable
Low Switch On Resistance
0.7 Normal, 7 in Backup
400 nA Standby Current
Automatic Battery Backup Switching (ADM8696)
Fast On-Board Gating of Chip Enable Signals (ADM8697)
Voltage Monitor for Power Fail or Low Battery Warning
Also Available in TSSOP Package
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical P Power Monitoring
ADM8696/ADM8697
FUNCTIONAL BLOCK DIAGRAMS
BATT ON
VBATT
VCC
LLIN
VOUT
LOW LINE
RESET GENERATOR
OSC IN
OSC SEL
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI)
TIMEBASE FOR RESET
AND WATCHDOG
WATCHDOG
TIMER
WATCHDOG
TRANSITION DETECTOR
ADM8696
1.3V
RESET
RESET
WATCHDOG
OUTPUT (WDO)
POWER FAIL
OUTPUT (PFO)
GENERAL DESCRIPTION
The ADM8696/ADM8697 supervisory circuits offer complete
single chip solutions for power supply monitoring and battery
control functions in microprocessor systems. These functions
include µP reset, backup battery switchover, watchdog timer,
CMOS RAM write protection and power failure warning.
The ADM8696/ADM8697 are available in 16-pin DIP and small
outline packages (including TSSOP) and provide the following
functions:
1. Power-On Reset output during power-up, power-down and
brownout conditions. The RESET voltage threshold is
adjustable using an external voltage divider. The RESET out-
put remains operational with VCC as low as 1 V.
2. A Reset pulse if the optional watchdog timer has not been
toggled within specified time.
3. Separate watchdog timeout and low line status outputs.
4. Adjustable reset and watchdog timeout periods.
5. A 1.3 V threshold detector for power fail warning, low battery
detection or to monitor a power supply other than VCC.
6. Battery backup switching for CMOS RAM, CMOS micro-
processor or other low power logic (ADM8696).
7. Write protection of CMOS RAM or EEPROM (ADM8697).
CEIN
LLIN
OSC IN
OSC SEL
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI)
RESET GENERATOR
TIMEBASE FOR RESET
AND WATCHDOG
WATCHDOG
TRANSITION DETECTOR
WATCHDOG
TIMER
ADM8697
1.3V
CEOUT
LOW LINE
RESET
RESET
WATCHDOG
OUTPUT (WDO)
POWER FAIL
OUTPUT (PFO)
The ADM8696/ADM8697 is fabricated using an advanced
epitaxial CMOS process combining low power consumption
(0.7 mW), extremely fast Chip Enable gating (2 ns) and high re-
liability. RESET assertion is guaranteed with VCC as low as 1 V.
In addition, the power switching circuitry is designed for mini-
mal voltage drop thereby permitting increased output current drive
of up to 100 mA without the need for an external pass transistor.
REV. 0
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: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997

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