ADM8697ANZ Analog Devices Inc, ADM8697ANZ Datasheet

ADM8697ANZ

Manufacturer Part Number

ADM8697ANZ

Description

IMPROVED ADM697 I.C

Manufacturer

Analog Devices Inc

Type

Battery Backup Circuitr

Datasheet

1.ADM8696ARWZ.pdf (13 pages)

Specifications of ADM8697ANZ

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

Through Hole

Package / Case

16-DIP (0.300", 7.62mm)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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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 P 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

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

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

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

7. Write protection of CMOS RAM or EEPROM (ADM8697).

REV. A

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.

Qualified for Automotive Applications

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 V

Watchdog Timer—100 ms, 1.6 s, or Adjustable

Low Switch On Resistance

0.7

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 µP Power Monitoring

brownout conditions. The RESET voltage threshold is

adjustable using an external voltage divider. The RESET out-

put remains operational with V

toggled within specified time.

detection or to monitor a power supply other than V

processor or other low power logic (ADM8696).

Normal, 7

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

Fax: 617/326-8703

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 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.

POWER FAIL

WATCHDOG

POWER FAIL

INPUT (WDI)

WATCHDOG

INPUT (PFI)

INPUT (WDI)

INPUT (PFI)

OSC SEL

OSC IN

BATT

FUNCTIONAL BLOCK DIAGRAMS

1.3V

TRANSITION DETECTOR

TIMEBASE FOR RESET

TRANSITION DETECTOR

RESET GENERATOR

TIMEBASE FOR RESET

ADM8696/ADM8697

RESET GENERATOR

World Wide Web Site: http://www.analog.com

AND WATCHDOG

WATCHDOG

Supervisory Circuits

WATCHDOG

BATT ON

Microprocessor

WATCHDOG

ADM8697

WATCHDOG

ADM8696

TIMER

as low as 1 V.

WATCHDOG

OUTPUT (WDO)

RESET

POWER FAIL

OUTPUT (PFO)

LOW LINE

RESET

WATCHDOG

OUTPUT (WDO)

POWER FAIL

OUTPUT (PFO)

LOW LINE

OUT

Related parts for ADM8697ANZ

ADM8697ANZ Summary of contents

Page 1

FEATURES Upgrade for ADM696/ADM697, 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 0.7 Normal ...

Page 2

ADM8696/ADM8697–SPECIFICATIONS P arameter V Operating Voltage Range CC V Operating Voltage Range BATT BATTERY BACKUP SWITCHING (ADM8696) V Output Voltage OUT V in Battery Backup Mode OUT Supply Current (Excludes I ) OUT Supply Current in Battery Backup Mode Battery ...

Page 3

ABSOLUTE MAXIMUM RATINGS +25°C unless otherwise noted ...

Page 4

ADM8696/ADM8697 Pin No. Mnemonic ADM8696 ADM8697 Function — BATT V 2 — OUT GND 4 5 RESET 15 15 WDI 11 11 PFI 9 9 PFO — — ...

Page 5

CIRCUIT INFORMATION Battery Switchover Section (ADM8696) The battery switchover circuit is designed to switch over to battery backup in the event of a power failure. When LL is below the reset threshold and V is below ...

Page 6

ADM8696/ADM8697 Table I. ADM8696, ADM8697 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 (ADM8697) The ADM8697 contains memory protection circuitry that 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

ADM8696/ADM8697–Typical Performance Curves 5 4.99 4.98 4.97 4.96 4.95 4. – mA OUT Figure 8. V vs. I Normal Operation OUT OUT 2.8 2.798 2.796 2.794 2.792 2.79 2.788 2.786 150 250 350 ...

Page 9

APPLICATIONS INFORMATION Increasing the Drive Current (ADM8696) 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

ADM8696/ADM8697 TYPICAL APPLICATIONS ADM8696 Figure 18 shows the ADM8696 in a typical power monitoring, battery backup application. V powers the CMOS RAM. OUT Under normal operating conditions with V internally connected power failure occurs, V ...

Page 11

OUTLINE DIMENSIONS 0.800 (20.32) 0.790 (20.07) 0.780 (19.81 0.280 (7.11) 0.250 (6.35) 1 0.240 (6.10) 8 0.100 (2.54) BSC 0.210 (5.33) MAX 0.015 0.150 (3.81) (0.38) MIN 0.130 (3.30) 0.115 (2.92) SEATING PLANE 0.022 (0.56) 0.005 (0.13) 0.018 ...

Page 12

... ADM8696ARWZ −40° 85°C ADM8696ARWZ-REEL −40° 85°C ADM8696ARU −40° 85°C ADM8696ARU-REEL −40° 85°C ADM8697AN −40° 85°C ADM8697ANZ −40° 85°C ADM8697ARW −40° 85°C ADM8697ARW-REEL −40° 85°C ADM8697ARWZ −40° 85°C 3 ADM8697ARU −40° 85°C ...

Page 13

REVISION HISTORY 6/10—Rev Rev. A Changes to Ordering Guide ........................................................... 12 ©1997-2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09139-0-6/10(A) Rev Page ADM8696/ADM8697 ...

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