ADM709 Analog Devices, ADM709 Datasheet

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ADM709

Manufacturer Part Number
ADM709
Description
Power Supply Monitor with Reset
Manufacturer
Analog Devices
Datasheet

Specifications of ADM709

# Of Monitored Voltages
1
Backup-battery Switch
No
Manual Reset Capability
No
Package
DIP,SOIC
Reset Threshold Summary
5 Options--2.63 to 4.65V
Reset Output-stage
Active-Low/Push-Pull
Min Reset Timeout (ms)
140
Watchdog Timer
No

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a
GENERAL DESCRIPTION
The ADM709 contains a power supply monitor which generates
a system reset during power-up, power-down and brownout
conditions. When V
goes low and holds the P in reset. On power-up the RESET
output is held low for 140 ms after V
old. The RESET output remains operational with V
as 1 V.
Three supply-voltage threshold levels are available suitable for
+5 V, +3.3 V and for +3 V supply monitoring. The actual reset
voltage threshold is given below.
The ADM709 is available in 8-pin DIP and SOIC packages.
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
+5 V, +3.3 V, +3 V Power Supply Monitor
35 A Quiescent Current
140 ms (min) Power-On Reset Pulse
Low Cost
8-Pin DIP/SO Packages
Upgrade for MAX709
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Critical P Monitoring
Automotive Systems
Critical P Power Monitoring
Suffix
L
M
T
S
R
Table I. Reset Threshold
CC
falls below the reset threshold, RESET
Voltage (V)
4.65
4.40
3.08
2.93
2.63
CC
rises above the thresh-
CC
as low
Model
ADM709LAN
ADM709RAR
*N = Plastic DIP; SO = SOIC.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
ADM709LAR
ADM709MAN
ADM709MAR
ADM709TAN
ADM709TAR
ADM709SAN
ADM709SAR
ADM709RAN
V
CC
FUNCTIONAL BLOCK DIAGRAM
V
TH
Typical Operating Circuit
Reset
Threshold
4.65 V
4.65 V
4.40 V
4.40 V
3.08 V
3.08 V
2.93 V
2.93 V
2.63 V
2.63 V
Power Supply Monitor
ADM709
ORDERING GUIDE
GND
V
CC
RESET
ADM709
GND
GENERATOR
Temperature
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
Range
–40 C to +85 C
–40 C to +85 C
RESET
© Analog Devices, Inc., 1995
RESET
with Reset
ADM709
V
GND
µP
CC
Fax: 617/326-8703
RESET
Package
Option*
N-8
SO-8
N-8
SO-8
N-8
SO-8
N-8
SO-8
N-8
SO-8

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ADM709 Summary of contents

Page 1

... The RESET output remains operational with Three supply-voltage threshold levels are available suitable for +5 V, +3.3 V and for +3 V supply monitoring. The actual reset voltage threshold is given below. The ADM709 is available in 8-pin DIP and SOIC packages. Table I. Reset Threshold Suffix L M ...

Page 2

... CC A ADM709L ADM709M ADM709T ADM709S ADM709R V = Reset Threshold max–min Reset Threshold max, V Rising CC CC ADM709R/S/ 1.2 mA Reset SINK CC Threshold min ADM709L/ 3.2 mA Reset SINK CC Threshold min 1.0 V SINK 100 A. V 1.2 V SINK CC ADM709R/S/ 500 A, V SOURCE CC Threshold max ...

Page 3

... V CC µP RESET GND Glitch Immunity The ADM709 is immune to short transients which may occur on the V line. This is important so that spurious resets are not CC generated as a result of minor glitches on the power supply. Additional glitch immunity may be obtained by connecting a capacitor (0 greater) as close as possible to the V on the device ...

Page 4

... ADM709 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Plastic DIP (N- 0.280 (7.11) PIN 1 0.240 (6.10 0.325 (8.25) 0.430 (10.92) 0.300 (7.62) 0.348 (8.84) 0.060 (1.52) 0.210 0.015 (0.38) (5.33) MAX 0.130 0.160 (4.06) 0.015 (0.381) (3.30) MIN 0.008 (0.204) 0.115 (2.93) SEATING 0.100 0.022 (0.558) 0.070 (1.77) PLANE (2.54) 0.014 (0.356) 0.045 (1.15) BSC ...

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