ADM8693ANZ Analog Devices Inc, ADM8693ANZ Datasheet

ADM8693ANZ

Manufacturer Part Number

ADM8693ANZ

Description

IC,Power Supply Supervisor,CMOS,DIP,16PIN,PLASTIC

Manufacturer

Analog Devices Inc

Type

Battery Backup Circuitr

Datasheet

1.ADM8695ARWZ.pdf (20 pages)

Specifications of ADM8693ANZ

Number Of Voltages Monitored

Output

Push-Pull, Push-Pull

Reset

Active High/Active Low

Reset Timeout

35 ms Minimum

Voltage - Threshold

4.4V

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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FEATURES

Upgrade for ADM690 to ADM695, MAX690 to MAX695

Specified over temperature

Low power consumption (0.7 mW)

Precision voltage monitor

Reset assertion down to 1 V V

Low switch on resistance 0.7 Ω normal, 7 Ω in backup

High current drive (100 mA)

Watchdog timer: 100 ms, 1.6 s, or adjustable

400 nA standby current

Automatic battery backup power switching

Extremely fast gating of chip enable signals (3 ns)

Voltage monitor for power fail

Available in TSSOP package

APPLICATIONS

Microprocessor systems

Computers

Controllers

Intelligent instruments

Automotive systems

PRODUCT HIGHLIGHTS

The ADM8690, ADM8692, and ADM8694 are available in

8-lead, PDIP packages and provide:

The ADM8691, ADM8693, and ADM8695 are available in 16-lead

PDIP and small outline packages (including TSSOP) and

provide three additional functions:

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 that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

Power-on reset output during power-up, power-down, and

brownout conditions. The RESET output remains

operational with V

Battery backup switching for CMOS RAM, CMOS

microprocessor, or other low power logic.

A reset pulse if the optional watchdog timer has not been

toggled within a specified time.

A 1.3 V threshold detector for power-fail warning, low battery

detection, or to monitor a power supply other than 5 V.

Write protection of CMOS RAM or EEPROM.

Adjustable reset and watchdog timeout periods.

Separate watchdog timeout, backup battery switchover, and

low V

status outputs.

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695

as low as 1 V.

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

Tel: 781.329.4700

Fax: 781.461.3113

POWER FAIL

WATCHDOG

INPUT (WDI)

WATCHDOG

INPUT (WDI)

INPUT (PFI)

OSC SEL

OSC IN

BATT

VOLTAGE DETECTOR = 4.65V (ADM8690, ADM8694)

RESET PULSE WIDTH = 50ms (AD8690, ADM8692)

VOLTAGE DETECTOR = 4.65V (ADM8691, ADM8695)

FUNCTIONAL BLOCK DIAGRAMS

4.65V

TRANSITION DETECTOR

WATCHDOG

RESET AND

1.3V

TIME BASE

TRANSITION DETECTOR

Figure 1. ADM8690/ADM8692/ADM8694

Figure 2. ADM8691/ADM8693/ADM8695

1.3V

WATCHDOG

(1.6s)

BATT ON

Supervisory Circuits

GENERATOR

4.40V (ADM8693)

RESET

200ms (ADM8694)

GENERATOR

4.40V (ADM8692)

RESET

Microprocessor

ADM8690/

ADM8692/

WATCHDOG

ADM8694

ADM8691/

ADM8693/

ADM8695

TIMER

www.analog.com

LOW LINE

RESET

WATCHDOG

OUTPUT (WDO)

POWER FAIL

OUTPUT (PFO)

RESET

POWER FAIL

OUTPUT (PFO)

OUT

Related parts for ADM8693ANZ

ADM8693ANZ Summary of contents

Page 1

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 FEATURES Upgrade for ADM690 to ADM695, MAX690 to MAX695 Specified over temperature Low power consumption (0.7 mW) Precision voltage monitor Reset assertion down Low switch on resistance 0.7 Ω normal, 7 Ω in backup ...

Page 2

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Product Highlights ........................................................................... 1 Functional Block Diagrams............................................................. 1 Revision History ............................................................................... 2 General Description ......................................................................... 3 Specifications..................................................................................... 4 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configurations and Function Descriptions ........................... ...

Page 3

GENERAL DESCRIPTION The ADM869x family of supervisory circuits offers complete single- chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include microprocessor reset, backup battery switchover, watchdog timer, CMOS RAM write protection, and power ...

Page 4

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 SPECIFICATIONS V = full operating range 2 BATT Table 2. Parameter BATTERY BACKUP SWITCHING V Operating Voltage Range CC ADM8690, ADM8691, ADM8694, ADM8695 ADM8692, ADM8693 V Operating Voltage Range BATT ADM8690, ADM8691, ADM8694, ADM8695 ...

Page 5

Parameter POWER-FAIL DETECTOR PFI Input Threshold PFI Input Current PFO Output Voltage PFO Short-Circuit Source Current PFO Short-Circuit Sink Current CHIP ENABLE GATING CE Threshold IN CE Pull-Up Current IN CE Output Voltage OUT CE Propagation Delay OSCILLATOR OSC IN ...

Page 6

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter BATT All Other Inputs Input Current BATT GND Digital Output Current Power Dissipation, N-8 PDIP θ Thermal Impedance JA Power ...

Page 7

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS OUT ADM8690/ ADM8692 ADM8694 3 GND 6 TOP VIEW (Not to Scale) 5 PFO PFI 4 Figure 3. ADM8690, ADM8692, and ADM8694 Pin Configuration Table 4. Pin Function ...

Page 8

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 TYPICAL PERFORMANCE CHARACTERISTICS 5.00 4.99 4.98 4.97 4.96 4.95 4. (mA) OUT Figure 5. V vs. I Normal Operation OUT OUT 2.800 2.798 2.796 2.794 2.792 2.790 2.788 2.786 150 250 350 ...

Page 9

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 6 PFI PFI PFO 2 1.3V 30pF 1 0 PFO 1.35 1.25 0 0.1 0.2 0.3 0.4 0.5 0.6 TIME (µs) Figure 11. Power-Fail Comparator Response Time Falling ...

Page 10

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 CIRCUIT INFORMATION BATTERY SWITCHOVER SECTION The battery switchover circuit compares V and connects V to whichever is higher. Switchover occurs OUT when higher than BATT greater than V ...

Page 11

In addition to RESET , the ADM8691/ADM8693/ADM8695 contain an active high RESET output. This is the complement of RESET and is intended for processors requiring an active high reset signal. WATCHDOG TIMER RESET The watchdog timer circuit monitors the activity ...

Page 12

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 On the ADM8690/ADM8692 the watchdog timeout period is fixed at 1.6 seconds and the reset pulse width is fixed at 50 ms. On the ADM8694 the watchdog timeout period is also 1.6 seconds but the reset pulse width is ...

Page 13

POWER-FAIL WARNING COMPARATOR An additional comparator is provided for early warning of failure in the microprocessor power supply. The power-fail input (PFI) is compared to an internal 1.3 V reference. The power-fail output ( PFO ) goes low when the ...

Page 14

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 APPLICATION INFORMATION INCREASING THE DRIVE CURRENT If the continuous output current requirements at V 100 mA lower V – V voltage differential is desired, CC OUT an external PNP pass transistor can be connected in parallel ...

Page 15

ALTERNATE WATCHDOG INPUT DRIVE CIRCUITS The watchdog feature can be enabled and disabled under program control by driving WDI with a three-state buffer (see Figure 28). When three-stated, the WDI input floats, thereby disabling the watchdog timer. WATCHDOG WDI STROBE ...

Page 16

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 TYPICAL APPLICATIONS ADM8690, ADM8692, AND ADM8694 Figure 30 shows the ADM8690/ADM8692/ADM8694 in a typical power monitoring, battery backup application. V powers the CMOS RAM. Under normal operating conditions with V present internally connected OUT ...

Page 17

ADM8695) to allow for this oscillator start-up time different reset pulse width is required, a capacitor should be connected to OSC IN external clock can be used. Refer to Table 5 and ...

Page 18

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 OUTLINE DIMENSIONS 0.400 (10.16) 0.365 (9.27) 0.355 (9.02 0.280 (7.11) 0.250 (6.35) 1 0.240 (6.10) 4 PIN 1 0.100 (2.54) BSC 0.060 (1.52) 0.210 MAX (5.33) MAX 0.015 0.150 (3.81) (0.38) 0.015 (0.38) MIN 0.130 (3.30) GAUGE ...

Page 19

... ADM8692ARN −40°C to +85°C ADM8692ARN-REEL −40°C to +85°C 1 ADM8692ARNZ −40°C to +85°C ADM8693AN −40°C to +85°C 1 ADM8693ANZ −40°C to +85°C ADM8693ARN −40°C to +85°C ADM8693ARN-REEL −40°C to +85°C 1 ADM8693ARNZ −40°C to +85°C ADM8693ARW − ...

Page 20

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 Model Temperature Range ADM8694AN −40°C to +85°C 1 ADM8694ANZ −40°C to +85°C ADM8694ARN −40°C to +85°C ADM8694ARN-REEL −40°C to +85°C ADM8694ARNZ 1 −40°C to +85°C ADM8695ARW −40°C to +85°C ADM8695ARW-REEL −40°C to +85°C 1 ADM8695ARWZ −40°C to +85°C 1 ...

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