Datasheet

Data Sheet ADM8690/ADM8691/ADM8695
Rev. C | Page 3 of 24
GENERAL DESCRIPTION
The ADM8690/ADM8691/ADM8695 supervisory circuits offer
complete single-chip solutions for power supply monitoring and
battery control functions in microprocessor systems. These func-
tions include microprocessor reset, backup battery switchover,
watchdog timer, CMOS RAM write protection, and power failure
warning. The complete family provides a variety of configurations
to satisfy most microprocessor system requirements.
The ADM8690/ADM8691/ADM8695 are fabricated using an
advanced epitaxial CMOS process that combines low power
consumption (0.7 mW), extremely fast chip enable gating (3 ns),
and high reliability.
RESET
assertion is guaranteed with V
CC
as
low as 1 V. In addition, the power switching circuitry is designed
for minimal voltage drop, thereby permitting increased output
current drive of up to 100 mA without the need for an external
pass transistor.
See Table 1 for a product selection guide listing the character-
istics of each device. To place an order, see the Ordering Guide.
Table 1. Product Selection Guide
Part No.
Nominal Reset
Time
Nominal V
CC
Reset Threshold
Nominal Watchdog
Timeout Period
Battery Backup
Switching
Base Drive,
Ext PNP
Chip Enable
Signals
ADM8690 50 ms 4.65 V 1.6 sec Yes No No
ADM8691 50 ms or ADJ 4.65 V 100 ms, 1.6 sec, ADJ Yes Yes Yes
ADM8695 200 ms or ADJ 4.65 V 100 ms, 1.6 sec, ADJ Yes Yes Yes