ADM707AR Analog Devices Inc, ADM707AR Datasheet

IC SUPERVISOR MPU 4.65 WD 8SOIC

ADM707AR

Manufacturer Part Number
ADM707AR
Description
IC SUPERVISOR MPU 4.65 WD 8SOIC
Manufacturer
Analog Devices Inc
Type
Simple Reset/Power-On Resetr
Datasheet

Specifications of ADM707AR

Rohs Status
RoHS non-compliant
Number Of Voltages Monitored
1
Output
Push-Pull, Push-Pull
Reset
Active High/Active Low
Reset Timeout
160 ms Minimum
Voltage - Threshold
4.65V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)

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FEATURES
Guaranteed RESET valid with V
190 μA quiescent current
Precision supply voltage monitor
200 ms reset pulse width
Debounced TTL/CMOS manual reset input (MR)
Independent watchdog timer (ADM705/ADM706)
1.60 sec timeout (ADM705/ADM706)
Active high reset output (ADM707/ADM708)
Voltage monitor for power-fail or low battery warning
Superior upgrade for MAX705 to MAX708
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Critical microprocessor supply monitoring
GENERAL DESCRIPTION
The ADM705/ADM706/ADM707/ADM708 microprocessor
supervisory circuits are suitable for monitoring 5 V power
supplies/batteries and can also monitor microprocessor activity.
The ADM705/ADM706 provide power-supply monitoring
circuitry that generate a reset output during power-up, power-
down, and brownout conditions. The reset output remains
operational with V
monitoring circuitry is also provided. This is activated if the
watchdog input has not been toggled within 1.60 seconds.
In addition, there is a 1.25 V threshold detector to warn of
power-failures, to detect low battery conditions, or to monitor an
additional power supply. An active low, debounced manual reset
input ( MR ) is also included.
Rev. G
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.
4.65 V (ADM705/ADM707)
4.40 V (ADM706/ADM708)
CC
as low as 1 V. Independent watchdog
CC
= 1 V
ADM705/ADM706/ADM707/ADM708
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The ADM705 and ADM706 are identical except for the reset
threshold monitor levels, which are 4.65 V and 4.40 V, respectively.
The ADM707 and ADM708 provide a similar functionality to
the ADM705 and ADM706 and only differ in that a watchdog
timer function is not available. Instead, an active high reset
output (RESET) is available as well as the active low reset output
( RESET ). The ADM707 and ADM708 are identical except for
the reset threshold monitor levels, which are 4.65 V and 4.40 V,
respectively.
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)
V
V
MR
MR
CC
CC
* VOLTAGE REFERENCE = 4.65V (ADM705), 4.40V (ADM706)
* VOLTAGE REFERENCE = 4.65V (ADM707), 4.40V (ADM708)
Low Cost Microprocessor
FUNCTIONAL BLOCK DIAGRAMS
4.65V*
1.25V
4.65V*
1.25V
WATCHDOG
TRANSITION
V
DETECTOR
V
CC
CC
250μA
250μA
Supervisory Circuits
Figure 1. ADM705/ADM706
Figure 2. ADM707/ADM708
©2008 Analog Devices, Inc. All rights reserved.
GENERATOR
GENERATOR
WATCHDOG
RESET AND
ADM705/
ADM706
WATCHDOG
TIMEBASE
RESET
RESET
ADM707/
ADM708
TIMER
www.analog.com
WATCHDOG
OUTPUT (WDO)
RESET
POWER-FAIL
OUTPUT (PFO)
RESET
RESET
POWER-FAIL
OUTPUT (PFO)

Related parts for ADM707AR

ADM707AR Summary of contents

Page 1

FEATURES Guaranteed RESET valid with 190 μA quiescent current Precision supply voltage monitor 4.65 V (ADM705/ADM707) 4.40 V (ADM706/ADM708) 200 ms reset pulse width Debounced TTL/CMOS manual reset input (MR) Independent watchdog timer (ADM705/ADM706) 1.60 ...

Page 2

ADM705/ADM706/ADM707/ADM708 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagrams ............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 4 ESD Caution .................................................................................. 4 Pin Configurations and Function Descriptions ...

Page 3

SPECIFICATIONS MIN MAX Table 1. Parameter POWER SUPPLY V Operating Voltage Range CC Supply Current LOGIC OUTPUT Reset Threshold Reset Threshold Hysteresis RESET PULSE WIDTH RESET ...

Page 4

ADM705/ADM706/ADM707/ADM708 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 θ ...

Page 5

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS MR WDO 1 8 ADM705/ V RESET ADM706 GND WDI 3 6 TOP VIEW (Not to Scale) PFI PFO 4 5 Figure 3. ADM705/ADM706 PDIP/SOIC Pin Configuration Table 3. Pin Function Descriptions ...

Page 6

ADM705/ADM706/ADM707/ADM708 TYPICAL PERFORMANCE CHARACTERISTICS A1 4.50V 100 RESET 1V 1V Figure 6. RESET Output Voltage vs. Supply Voltage A1 4.50V 100 RESET Figure 7. ADM707/ADM708 RESET Output Voltage ...

Page 7

RESET RESET 25° 100ns/DIV Figure 10. RESET , RESET Assertion 5V RESET 25° 100ns/DIV Figure 11. RESET , RESET Deassertion ADM705/ADM706/ADM707/ADM708 ...

Page 8

ADM705/ADM706/ADM707/ADM708 CIRCUIT INFORMATION POWER-FAIL RESET OUTPUT RESET is an active low output that provides a reset signal to the microprocessor whenever the V input is below the reset CC threshold. An internal timer holds RESET low for 200 ms after ...

Page 9

Adding Hysteresis to the Power-Fail Comparator For increased noise immunity, hysteresis can be added to the power-fail comparator. Because the comparator circuit is noninverting, hysteresis can be added simply by connecting a resistor between the PFO output and the PFI ...

Page 10

ADM705/ADM706/ADM707/ADM708 APPLICATIONS INFORMATION A typical application circuit is shown in Figure 18. The unregulated dc input supply is monitored using PFI via the resistive divider network. Resistor R1 and Resistor R2 should be selected so that when the supply voltage ...

Page 11

OUTLINE DIMENSIONS 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2440) 4.00 (0.1574) 5.80 (0.2284) 3.80 (0.1497 1.27 (0.0500) BSC 1.75 (0.0688) 1.35 (0.0532) 0.25 (0.0098) 0.10 ...

Page 12

... ADM707ANZ −40°C to +85°C ADM707AR −40°C to +85°C ADM707AR-REEL −40°C to +85°C 1 ADM707ARZ −40°C to +85°C 1 ADM707ARZ-REEL −40°C to +85°C ADM708AN −40°C to +85°C 1 ADM708ANZ −40°C to +85°C ADM708AR −40°C to +85°C ADM708AR-REEL − ...

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