Microprocessor Supervisory Circuits
ADM691A/ADM693A/ADM800L/M

FEATURES FUNCTIONAL BLOCK DIAGRAM
Low Power Consumption:
Precision Voltage Monitor
±2% Tolerance on ADM800L/M
Reset Time Delay—200 ms, or Adjustable
1 µA Standby Current
Automatic Battery Backup Power Switching
Fast Onboard Gating of Chip Enable Signals
Also Available in TSSOP Package (ADM691A)

APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems C
ritical µP Power Monitoring


GENERAL DESCRIPTION
The ADM691A/ADM693A/ADM800L/ADM800M family of supervisory circuits offers 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 family of products provides an upgrade for the MAX691A/93A/800M family of products.

All parts are available in 16-pin DIP and SO packages. The ADM691A is also available in a space-saving TSSOP package. The following functionality is provided:

1. Power-on reset output during power-up, power-down and brownout conditions. The circuitry 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 1.25 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other
than +5 V.


ABSOLUTE MAXIMUM RATINGS*
(TA = 25°C unless otherwise noted)
V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
V_BATT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
All Other Inputs . . . . . . . . . . . . . . . . . –0.3 V to VOUT + 0.5 V
Input Current
V_CC (Peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 mA
V_CC (Continuous) . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA
V_BATT (Peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA
V_BATT (Continuous) . . . . . . . . . . . . . . . . . . . . . . . . . . 25 mA
GND, BATT ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 mA
Power Dissipation, N-16 DIP . . . . . . . . . . . . . . . . . . . . . 842 mW
θ_ϑA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . 135°C/W
Power Dissipation, R-16 Narrow SOIC . . . . . . . . . . . . . 700 mW
θ_JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . .110°W
Power Dissipation, R-16 Wide SOIC . . . . . . . . . . .. . . . . . 762 mW
θ_JA Thermal Impedance . . . . . . . . . . . . . . . . . . . .. . . . . 110°C/W
Power Dissipation, RU-16 TSSOP . . . . . . . . . . . . . .. . . . 500 mW
θ_JA Thermal Impedance . . . . . . . . . . . . . . . . . . .. . . . . . 158°C/W
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . .V . . . . +300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . –65°C to +150°C

*Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum ratings for extended periods of time may affect device reliability.

ORDERING GUIDE

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