adm9264 Analog Devices, Inc., adm9264 Datasheet

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adm9264

Manufacturer Part Number
adm9264
Description
Quad Power Supply Monitor For Desktop Pcs
Manufacturer
Analog Devices, Inc.
Datasheet

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a
GENERAL DESCRIPTION
The ADM9264 is a Quad Supply Monitor IC which simulta-
neously monitors four separate power supply voltages and out-
puts error signals if any of the supply voltages go out of limits.
It is designed for PC supply monitoring but can be used on
any system where multiple power supplies require monitor-
ing. The error output signals are available individually and also
gated into a common output - PWROK. Auxiliary inputs
ERRX, ERRY are provided which are also gated into the main
PWROK signal. These inputs allow signals from other monitor-
ing circuits (for example temperature sensor, alarm, etc.) to be
linked into the ADM9264.
Each power supply monitor circuit uses a proprietary window
comparator design whereby a three resistor network is used in
conjunction with two comparators and a single precision voltage
reference to check if the supply is within its required operating
tolerance. An added feature of this design is that the power
supply voltages being monitored can be higher than the power
supply voltage to the monitoring IC itself.
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
Monitoring of 12 V, 5 V, 3.3 V and 2.8 V Supplies in
Auxiliary Sensor Inputs
Low Power: 25 A Typical
Internal Comparator Hysteresis
Power Supply Glitch Immunity
V
Guaranteed from –40 C to +85 C
No External Components
16-Pin Narrow SOIC Package (150 Mil Wide)
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Network Systems
CC
Parallel
from 2.5 V to 6 V
Analog Devices’ experience in the design of power supply super-
visory circuits is used to provide an optimum solution for the
overall circuit in terms of cost, performance and power con-
sumption. Key features of the design include the incorporation
of hysteresis and glitch immunity into the comparators, which
minimizes the possibility of spurious triggering by noise spikes
on the supplies being monitored.
The part is manufactured on one of Analog Devices’ proprietary
BiCMOS processes, which also includes high performance thin
film resistors to achieve the accuracy required for the precision
voltage reference and power supply high and low trip points.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
ERRX
GND
V
SU1
SU2
SU3
SU4
NC
CC
Quad Power Supply Monitor
1
2
3
4
5
6
7
8
NC = NO CONNECT
FUNCTIONAL BLOCK DIAGRAM
ADM9264
V
REF
World Wide Web Site: http://www.analog.com
H
H
H
H
L
L
L
L
for Desktop PCs
© Analog Devices, Inc., 1997
ADM9264
MONITOR
PWROK
LOGIC
16
15
14
13
12
11
10
9
PWROK
DIS
SU4DET
ERR3
ERRY
ERR1
ERR2
ERR4

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adm9264 Summary of contents

Page 1

... Controllers Intelligent Instruments Network Systems GENERAL DESCRIPTION The ADM9264 is a Quad Supply Monitor IC which simulta- neously monitors four separate power supply voltages and out- puts error signals if any of the supply voltages go out of limits designed for PC supply monitoring but can be used on any system where multiple power supplies require monitor- ing ...

Page 2

... ADM9264–SPECIFICATIONS Parameter OPERATING TEMPERATURE RANGE V SUPPLY VOLTAGE CC V SUPPLY CURRENT CC SU1 INPUT RESISTANCE SU2 INPUT RESISTANCE SU3 INPUT RESISTANCE SU4 INPUT RESISTANCE SU1 HIGH TRIP POINT SU2 HIGH TRIP POINT SU3 HIGH TRIP POINT SU4 HIGH TRIP POINT SU1 LOW TRIP POINT ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM9264 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... Open Drain Output. Low when SU1 is outside its required tolerance wise through 10 k external resistor to a positive power supply. PIN CONFIGURATION GND 1 16 ERR1 SU1 ERR2 2 15 PWROK SU2 3 14 ADM9264 SU3 4 13 ERR3 TOP VIEW SU4 5 12 ERR4 (Not to Scale DIS 6 ...

Page 5

... X = don’t care. Power Supply V CC The ADM9264 can be powered from any supply voltage between 2.5 V and 6 V. This includes any of the supply voltages apart from that connected to SU1, since this is greater than 6 V. The logic outputs are open-drain and take their output high ...

Page 6

... TEMPERATURE – C Figure 2. Hysteresis vs. Temperature for SU1—High to Low 0.2 0.15 0.1 0.05 0 –30 – TEMPERATURE – C Figure 3. Hysteresis vs. Temperature for SU2—Low to High Typical Performance Characteristics–ADM9264 0.25 0.2 0.15 0.1 0. –30 Figure 4. Hysteresis vs. Temperature for SU2—High to Low 0.12 0.1 0.08 0.06 0.04 0.02 0 – ...

Page 7

... Figure 11. Variation of SU2 High Trip Point With Temperature –10 –20 – 100 Figure 12. Variation of SU2 Low Trip Point With Temperature –7– ADM9264 –20 TEMPERATURE – –20 TEMPERATURE – ...

Page 8

... ADM9264 –10 –20 – –20 TEMPERATURE – C Figure 13. Variation of SU3 High Trip Point With Temperature –10 –20 – –20 TEMPERATURE – C Figure 14. Variation of SU3 Low Trip Point With Temperature –10 – ...

Page 9

... Figure 21. Supply Current vs. Temperature 100 100 0 –9– ADM9264 – TEMPERATURE – C 100 200 300 400 500 600 700 800 900 1000 GLITCH AMPLITUDE – mV Figure 22. Glitch Immunity ...

Page 10

... ADM9264 APPLICATIONS A typical application of the ADM9264 is shown in Figure 23. The analog inputs SU1 to SU4 are connected to the four power supply outputs of a system to monitor the supply voltages. One of the digital inputs, ERRY, is connected to a temperature sensor such as the TMP01 or AD22105. The trip point of the overtemperature comparator is set by R goes low when the temperature exceeds safe limits ...

Page 11

... REV. 0 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 16-Lead Narrow SOIC (R-16A) 0.3937 (10.00) 0.3859 (9.80 0.1574 (4.00) 0.2440 (6.20) 0.1497 (3.80 0.2284 (5.80) 0.0688 (1.75) PIN 1 0.0532 (1.35) 0.0098 (0.25) 0.0040 (0.10) 8 0.0500 0.0192 (0.49) 0 SEATING 0.0099 (0.25) (1.27) 0.0138 (0.35) PLANE BSC 0.0075 (0.19) –11– ADM9264 0.0196 (0.50 0.0099 (0.25) 0.0500 (1.27) 0.0160 (0.41) ...

Page 12

–12– ...

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