ADM8690ANZ 데이터 시트보기 (PDF) - Analog Devices

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ADM8690ANZ

Microprocessor Supervisory Circuits

Analog Devices 

Data Sheet

ADM8690/ADM8691/ADM8695

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 VCC 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 Nominal VCC

Time

Reset Threshold

ADM8690 50 ms

4.65 V

ADM8691 50 ms or ADJ

4.65 V

ADM8695 200 ms or ADJ 4.65 V

Nominal Watchdog

Timeout Period

1.6 sec

100 ms, 1.6 sec, ADJ

100 ms, 1.6 sec, ADJ

Battery Backup

Switching

Yes

Yes

Yes

Base Drive,

Ext PNP

No

Yes

Yes

Chip Enable

Signals

No

Yes

Yes

Rev. C | Page 3 of 24

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