adm708san Analog Devices, Inc., adm708san Datasheet

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adm708san

Manufacturer Part Number
adm708san
Description
3 V, Voltage Monitoring Microprocessor Supervisory Circuit
Manufacturer
Analog Devices, Inc.
Datasheet
1.ADM708SAN.pdf (16 pages)
FEATURES
Precision supply voltage monitor
100 μA quiescent current
200 ms reset pulse width
Debounced manual reset input ( MR )
Independent watchdog timer
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 microprocessor monitoring
Automotive systems
Battery-operated systems
Portable instruments
GENERAL DESCRIPTION
The ADM706P/ADM706R/ADM706S/ADM706T and the
ADM708R/ADM708S/ADM708T microprocessor supervisory
circuits are suitable for monitoring either 3 V or 3.3 V power
supplies.
The ADM706P/ADM706R/ADM706S/ADM706T provide the
following functions:
1.
2.
3.
4.
Rev. B
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.
(ADM708R/ADM708S/ADM708T)
2.63 V (ADM706P, ADM706R, ADM708R)
2.93 V (ADM706S, ADM708S)
3.08 V (ADM706T, ADM708T)
1.6 sec timeout (ADM706x)
Active high (ADM706P)
Active low (ADM706R/ADM706S/ADM706T)
Both active high and active low
Power-supply monitoring circuitry that generates a reset
output during power-up, power-down, and brownout
conditions. The reset output remains operational with V
as low as 1 V.
Independent watchdog monitoring circuitry that is activated
if the watchdog input has not been toggled within 1.6 sec.
A 1.25 V threshold detector for power-fail warning, low
battery detection, or to monitor an additional power supply.
An active low debounced MR input.
ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T
CC
= 1 V
Microprocessor Supervisory Circuits
CC
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The ADM706R, ADM706S, and 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.
The ADM708R/ADM708S/ADM708T provide the same
functionality as the ADM706R/ADM706S/ADM706T and only
differ in that:
1.
2.
All parts are available in narrow 8-lead PDIP and 8-lead SOIC
packages.
POWER-FAIL
POWER-FAIL
WATCHDOG
INPUT (WDI)
INPUT (PFI)
INPUT (PFI)
A watchdog timer function is not available.
An active high reset output (RESET) in addition to the
active low ( RESET ) output is available.
V
V
MR
MR
CC
CC
* VOLTAGE REFERENCE = 2.63V (P/R), 2.93V (S), 3.08V (T)
* VOLTAGE REFERENCE = 2.63V (R), 2.93V (S), 3.08V (T)
Figure 1. ADM706P/ADM706R/ADM706S/ADM706T
FUNCTIONAL BLOCK DIAGRAMS
V
1.25V
1.25V
V
REF
REF
3 V, Voltage Monitoring
WATCHDOG
TRANSITION
V
Figure 2. ADM708R/ADM708S/ADM708T
DETECTOR
V
CC
*
*
CC
70μA
70μA
©2007 Analog Devices, Inc. All rights reserved.
ADM706P/ADM706R/
ADM706S/ADM706T
ADM708R/ADM708S/
GENERATOR
GENERATOR
WATCHDOG
RESET AND
WATCHDOG
TIMEBASE
RESET
RESET
TIMER
ADM708T
www.analog.com
WATCHDOG
OUTPUT (WDO)
POWER-FAIL
OUTPUT (PFO)
RESET,
(P = RESET)
RESET
RESET
POWER-FAIL
OUTPUT (PFO)

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adm708san Summary of contents

Page 1

... RESET ) output is available. All parts are available in narrow 8-lead PDIP and 8-lead SOIC packages. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved. WATCHDOG WATCHDOG TIMER OUTPUT (WDO) RESET AND ...

Page 2

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block DiagramS ............................................................ 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance ...

Page 3

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T SPECIFICATIONS 5.5 V (ADM706P/ADM70xR unless otherwise noted. Table 1. Parameter POWER SUPPLY V Operating Voltage Range CC Supply Current LOGIC OUTPUT Reset Threshold (V ) RST Reset Threshold Hysteresis RESET PULSE ...

Page 4

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T Parameter MANUAL RESET INPUT MR Pull-Up Current ( Pulse Width MR INPUT THRESHOLD RESET OUTPUT DELAY POWER-FAIL INPUT PFI Input Threshold PFI Input Current ...

Page 5

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T ABSOLUTE MAXIMUM RATINGS T = 25°C unless otherwise noted. A Table 2. Parameter V CC All Other Inputs Input Current V CC GND Digital Output Current Power Dissipation, N-8 (PDIP) θ Thermal Impedance JA Power Dissipation, R-8 (SOIC) ...

Page 6

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T PIN CONFIGURATION AND FUNCTION DESCRIPTIONS MR WDO 1 8 ADM706P V RESET GND WDI 3 TOP VIEW 6 (Not to Scale) PFI PFO 5 4 Figure 3. ADM706P Table 3. Pin Function Descriptions Pin No. ...

Page 7

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T TYPICAL PERFORMANCE CHARACTERISTICS V CC RESET 400ms/DIV Figure 6. ADM70xR/ADM70xS/ADM70xT RESET Output Voltage vs. Supply Voltage V CC RESET 400ms/DIV Figure 7. RESET Output Voltage vs. Supply Voltage 1.3V PFI 3V 500ns/DIV Figure 8. PFI Assertion Response Time ...

Page 8

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T RESET 2µs/DIV Figure 12. ADM70xR/ADM70xS/ADM70xT RESET Response Time T = 25° Rev Page ...

Page 9

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T CIRCUIT INFORMATION WATCHDOG WATCHDOG WATCHDOG TRANSITION INPUT (WDI) TIMER DETECTOR V RESET AND CC WATCHDOG TIMEBASE 70μA MR RESET GENERATOR ADM706P/ADM706R/ REF POWER-FAIL ADM706S/ADM706T INPUT (PFI) 1.25V * VOLTAGE REFERENCE = 2.63V (P/R), 2.93V ...

Page 10

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T The watchdog monitor can be deactivated by floating the watchdog input (WDI). The WDO output can now be used as a low line output because it only goes low when V the reset threshold ...

Page 11

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T APPLICATIONS INFORMATION A typical operating circuit is shown in Figure 20. The unregulated dc input supply is monitored using the PFI input via the resistive divider network. Resistor R1 and Resistor R2 should be selected so that when ...

Page 12

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T OUTLINE DIMENSIONS 0.210 (5.33) MAX 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR ...

Page 13

... ADM708RAR-REEL −40°C to +85°C 1 ADM708RARZ −40°C to +85°C ADM708RARZ-REEL 1 −40°C to +85°C ADM708SAN −40°C to +85°C 1 ADM708SANZ −40°C to +85°C ADM708SAR −40°C to +85°C ADM708SAR-REEL −40°C to +85°C 1 ADM708SARZ −40°C to +85°C 1 ADM708SARZ-REEL − ...

Page 14

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T NOTES Rev Page ...

Page 15

ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T NOTES Rev Page ...

Page 16

... ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T NOTES ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06435-0-2/07(B) Rev Page ...

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