ADM708RAN Analog Devices, ADM708RAN Datasheet

ADM708RAN

Manufacturer Part Number

ADM708RAN

Description

Manufacturer

Analog Devices

Datasheet

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GENERAL DESCRIPTION

The ADM706P/R/S/T and the ADM708R/S/T microprocessor

supervisory circuits are suitable for monitoring either 3 V or 3.3 V

power supplies.

The ADM706P/R/S/T provide the following functions

1. Power-supply monitoring circuitry which generates a Reset

2. Independent watchdog monitoring circuitry which is acti-

3. A 1.25 V threshold detector for power fail warning, low bat-

4. An active low debounced manual reset input (MR).

The ADM706R, ADM706S, ADM706T are identical except for

the reset threshold monitor levels which are 2.63 V, 2.93 V, and

3.08 V respectively. The ADM706P is identical to the

ADM706R in that the reset threshold is 2.63 V. It differs only in

that it has an active high reset output.

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.

FEATURES

Precision Supply-Voltage Monitor

100 A Quiescent Current

200 ms Reset Pulse Width

Debounced Manual Reset Input (MR)

Independent Watchdog Timer—1.6 sec Timeout

Reset Output

Voltage Monitor for Power-Fail or Low Battery Warning

Guaranteed RESET Valid with V

Superior Upgrade for MAX706P/R/S/T, MAX708R/S/T

APPLICATIONS

Microprocessor Systems

Computers

Controllers

Intelligent Instruments

Critical P Monitoring

Automotive Systems

Battery Operated Systems

Portable Instruments

output during power-up, power-down and brownout condi-

tions. The reset output remains operational with V

as 1 V.

vated if the watchdog input has not been toggled within 1.6

seconds.

tery detection, or to monitor an additional power supply .

+2.63 V (ADM706P/R, ADM708R)

+2.93 V (ADM706S, ADM708S)

+3.08 V (ADM706T, ADM708T)

Active High (ADM706P)

Active Low (ADM706R/S/T)

(ADM706x)

Both Active High and Active Low (ADM708R/S/T)

= 1 V

as low

ADM706P/R/S/T, ADM708R/S/T

The ADM708R/S/T provide the same functionality as the

ADM706R/S/T and only differ in that:

1. A watchdog timer function is not available.

2. An active high reset output (RESET) in addition to the

All parts are available in 8-pin DIP and narrow SOIC packages.

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

Tel: 617/329-4700

POWER FAIL

WATCHDOG

INPUT (WDI)

INPUT (PFI)

active low (RESET) output is available.

FUNCTIONAL BLOCK DIAGRAMS

VOLTAGE REFERENCE = 2.63V (P/R), 2.93V (S), 3.08V (T)

VOLTAGE REFERENCE = 2.63V (R), 2.93V (S), 3.08V (T)

1.25V

+3 V, Voltage Monitoring

REF

TRANSITION

WATCHDOG

DETECTOR

70µA

P Supervisory Circuits

70µA

GENERATOR

WATCHDOG

TIMEBASE

GENERATOR

RESET &

TIMER

RESET

ADM708

ADM706

Fax: 617/326-8703

WATCHDOG

OUTPUT(WDO)

RESET,

(P = RESET)

POWER FAIL

OUTPUT (PFO)

RESET

POWER FAIL

OUTPUT (PFO)

Related parts for ADM708RAN

ADM708RAN Summary of contents

Page 1

... ADM706R in that the reset threshold is 2. differs only in that it has an active high reset output. 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 ...

Page 2

ADM706P/R/S/T, ADM708R/S/T–SPECIFICATIONS 5.5 V (ADM70_S 3. 5.5 V (ADM70_T Parameter Min V Operating Voltage Range 1.0 CC Supply Current Reset Threshold (V ) 2.55 RST 2.85 3.00 Reset ...

Page 3

... ADM706RAR – +85 C ADM706SAN – +85 C ADM706SAR – +85 C ADM706TAN – +85 C ADM706TAR – +85 C ADM708RAN – +85 C ADM706RAR – +85 C ADM708SAN – +85 C ADM706SAR – +85 C ADM708TAN – +85 C ADM706TAR – ...

Page 4

ADM706P/R/S/T, ADM708R/S/T Pin No. Pin No. Mnemonic ADM706 ADM708 GND 3 3 PFI 4 4 PFO 5 5 WDI 6 N/A NC N/A 6 RESET 7 (R/S/T Only) 7 RESET 7 (P Only) ...

Page 5

WATCHDOG WATCHDOG WATCHDOG INPUT (WDI) TRANSITION TIMER DETECTOR RESET & WATCHDOG TIMEBASE 70µA MR RESET GENERATOR REF ADM706 POWER FAIL INPUT (PFI) 1.25V * VOLTAGE REFERENCE = 2.63V (P/R), 2.93V (S), 3.08V (T) Figure ...

Page 6

ADM706P/R/S/T, ADM708R/S/T Power-Fail Comparator The power-fail comparator is an independent comparator which may be used to monitor the input power supply. The compara- tor’s inverting input is internally connected to a 1.25 V refer- ence voltage.The noninverting input is available ...

Page 7

PFI +3V 500ns/DIV Figure 10. PFI Assertion Response Time 1.2V PFO 0V 500ns/DIV Figure 11. PFI Deassertion Response Time + +3V ...

Page 8

ADM706P/R/S/T, ADM708R/S/T Microprocessor activity is monitored using the WDI input. This is driven using an output line from the processor. The software routines should toggle this line at least once every 1.6 seconds problem occurs and this line ...

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