ADM696AR Analog Devices Inc, ADM696AR Datasheet

ADM696AR

Manufacturer Part Number

ADM696AR

Description

IC SUPERVISOR MPU 100MA 16SOIC

Manufacturer

Analog Devices Inc

Type

Battery Backup Circuitr

Datasheet

1.ADM696ARZ.pdf (12 pages)

Specifications of ADM696AR

Rohs Status

RoHS non-compliant

Number Of Voltages Monitored

Output

Push-Pull, Push-Pull

Reset

Active High/Active Low

Reset Timeout

35 ms Minimum

Voltage - Threshold

1.3V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

16-SOIC (0.300", 7.5mm Width)

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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.

GENERAL DESCRIPTION

The ADM696/ADM697 supervisory circuits offer complete

single chip solutions for power supply monitoring and battery

control functions in microprocessor systems. These functions

include P reset, backup-battery switchover, watchdog timer,

CMOS RAM write protection, and power failure warning.

The ADM696/ADM697 are available in 16-pin DIP and small

outline packages and provide the following functions:

1. Power-On Reset output during power-up, power-down and

2. A Reset pulse if the optional watchdog timer has not been

3. Separate watchdog time-out and low line status outputs.

4. Adjustable reset and watchdog timeout periods.

5. A 1.3 V threshold detector for power fail warning, low bat-

6. Battery backup switching for CMOS RAM, CMOS micro-

7. Write protection of CMOS RAM or EEPROM (ADM697).

FEATURES

Superior Upgrade for MAX696/MAX697

Specified Over Temperature

Adjustable Low Line Voltage Monitor

Power OK/Reset Time Delay

Reset Assertion Down to 1 V V

Watchdog Timer—100 ms, 1.6 s, or Adjustable

Low Switch On Resistance

1.5

600 nA Standby Current

Automatic Battery Backup Switching (ADM696)

Fast On-Board Gating of Chip Enable Signals (ADM697)

Voltage Monitor for Power Fail or Low Battery Warning

APPLICATIONS

Microprocessor Systems

Computers

Controllers

Intelligent Instruments

Automotive Systems

Critical P Power Monitoring

brownout conditions. The RESET voltage threshold is

adjustable using an external voltage divider. The RESET

output remains operational with V

toggled within specified time.

tery detection, or to monitor a power supply other than V

processor or other low power logic (ADM696).

Normal, 20

in Backup

as low as 1 V.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

POWER FAIL

The ADM696/ADM697 is fabricated using an advanced epitaxial

CMOS process combining low power consumption (5 mW),

extremely fast Chip Enable gating (5 ns) and high reliability.

RESET assertion is guaranteed with V

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.

WATCHDOG

INPUT (WDI)

INPUT (PFI)

OSC SEL

OSC IN

BATT

FUNCTIONAL BLOCK DIAGRAMS

1.3V

TRANSITION DETECTOR

TIMEBASE FOR RESET

RESET GENERATOR

AND WATCHDOG

WATCHDOG

Supervisory Circuits

ADM696/ADM697

BATT ON

Microprocessor

ADM696

ADM697

WATCHDOG

TIMER

as low as 1 V. In

Fax: 617/326-8703

LOW LINE

RESET

WATCHDOG

OUTPUT (WDO)

LOW LINE

RESET

WATCHDOG

OUTPUT (WDO)

POWER FAIL

OUTPUT (PFO)

POWER FAIL

OUTPUT (PFO)

OUT

Related parts for ADM696AR

ADM696AR Summary of contents

Page 1

FEATURES Superior Upgrade for MAX696/MAX697 Specified Over Temperature Adjustable Low Line Voltage Monitor Power OK/Reset Time Delay Reset Assertion Down Watchdog Timer—100 ms, 1 Adjustable Low Switch On Resistance 1.5 Normal ...

Page 2

ADM696/ADM697–SPECIFICATIONS P arameter V Operating Voltage Range CC V Operating Voltage Range BATT BATTERY BACKUP SWITCHING (ADM696) V Output Voltage OUT V in Battery Backup Mode OUT Supply Current (Excludes I ) OUT Supply Current in Battery Backup Mode Battery ...

Page 3

... Although the ADM696/ADM697 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. ORDERING GUIDE Model Temperature Range ADM696AN – +85 C ADM696AR – +85 C ADM696AQ – +85 C ADM696SQ – +125 C ADM697AN – +85 C ADM697AR – ...

Page 4

ADM696/ADM697 Pin No. Mnemonic ADM696 ADM697 — BATT V 2 — OUT GND 4 5 RESET 15 15 WDI 11 11 PFI 9 9 PFO — — 12 ...

Page 5

CIRCUIT INFORMATION Battery-Switchover Section (ADM696) The battery switchover circuit compares V input, and connects V to whichever is higher. Switchover OUT occurs when higher than V CC when greater than V CC ...

Page 6

ADM696/ADM697 Table I. ADM696, ADM697 Reset Pulse Width and Watchdog Timeout Selections OSC SEL OSC IN Low External Clock Input Low External Capacitor Floating or High Low Floating or High Floating or High NOTE With the OSC SEL pin low, ...

Page 7

CE Gating and RAM Write Protection (ADM697) The ADM697 contains memory protection circuitry which ensures the integrity of data in memory by preventing write operations when LL is below the threshold voltage. When greater than 1.3 V, ...

Page 8

ADM696/ADM697–Typical Performance Curves 5.00 4.95 4.90 SLOPE = 1.5Ω 4.85 4. – mA OUT Figure 8. V vs. I Normal Operation OUT OUT 2.80 2.79 2.78 SLOPE = 20Ω 2.77 2.76 0 200 400 600 I ...

Page 9

APPLICATIONS INFORMATION Increasing the Drive Current (ADM696) If the continuous output current requirements at V 100 lower V –V voltage differential is desired, CC OUT an external PNP pass transistor may be connected in parallel with ...

Page 10

ADM696/ADM697 Replacing the Back-Up Battery When changing the back-up battery with system power on, spu- rious resets can occur when the battery is removed. This occurs because the leakage current flowing out of the V charge up the stray capacitance. ...

Page 11

This application also shows an optional, external transistor which may be used to provide in excess of 100 mA current When V is higher than V , the BATT ON output OUT CC BATT goes low, providing ...

Page 12

–12– ...

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