a
FEATURES
Monitoring of 12 V, 5 V, 3.3 V and 2.8 V Supplies in
Parallel
Auxiliary Sensor Inputs
Low Power: 25 A Typical
Internal Comparator Hysteresis
Power Supply Glitch Immunity
V
CC
from 2.5 V to 6 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
Quad Power Supply Monitor
for Desktop PCs
ADM9264
FUNCTIONAL BLOCK DIAGRAM
L
GND
1
H
SU1
2
15 ERR2
16 ERR1
L
PWROK
MONITOR
LOGIC
SU2
3
H
14 PWROK
L
SU3
4
13 ERR3
H
SU4
5
L
NC
6
H
11 DIS
12 ERR4
GENERAL DESCRIPTION
ERRX
7
V
REF
10 ERRY
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.
V
CC
8
ADM9264
NC = NO CONNECT
9 SU4DET
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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997
ADM9264–SPECIFICATIONS
Parameter
OPERATING TEMPERATURE RANGE
V
CC
SUPPLY VOLTAGE
V
CC
SUPPLY CURRENT
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
SU2 LOW TRIP POINT
SU3 LOW TRIP POINT
SU4 LOW TRIP POINT
SU1 HYSTERESIS
SU2 HYSTERESIS
SU3 HYSTERESIS
SU4 HYSTERESIS
GLITCH IMMUNITY
PROPAGATION DELAY
DIGITAL INPUT LOW, V
IL
DIGITAL INPUT HIGH, V
IH
DIGITAL INPUT LOW, V
IL
DIGITAL INPUT HIGH, V
IH
DIGITAL INPUT CURRENT
OPEN DRAIN OUTPUT LOW
OPEN DRAIN OUTPUT HIGH
SUPPLY RANGE FOR V+
Specifications subject to change without notice.
(V
CC
= Full Operating Range, T
A
= T
MIN
to T
MAX
unless otherwise noted)
Typ
Max
85
6.0
25
75
Units
°C
V
µA
kΩ
kΩ
kΩ
kΩ
13.2
5.55
3.66
3.05
11.28
4.65
3.07
2.66
V
V
V
V
V
V
V
V
mV
mV
mV
mV
µs
µs
0.8
V
V
0.5
V
V
+1
0.4
µA
V
V
6.0
V
Digital Inputs = V
CC
/GND
I IN ~ 50
µA
when SU1 = 12 V
I IN ~ 50
µA
when SU2 = 5 V
I IN ~ 50
µA
when SU3 = 3.3 V
I IN ~ 50
µA
when SU4 = 2.8 V
Measured with SU1 Rising
Measured with SU2 Rising
Measured with SU3 Rising
Measured with SU4 Rising
Measured with SU1 Falling
Measured with SU2 Falling
Measured with SU3 Falling
Measured with SU4 Falling
Measured at SU1
Measured at SU2
Measured at SU3
Measured at SU4
100 mV Glitch on V
CC
or SU1-4
Delay from Supply Going Outside
Tolerance until Output Changes
4.0 V < V
CC
< 6 V
4.0 V < V
CC
< 6 V
2.5 V < V
CC
< 4.0 V
2.5 V < V
CC
< 4.0 V
(ERRX,
ERRY,
DIS)
10 kΩ External to Positive Supply V+
10 kΩ External to Positive Supply V+
V+ Can Be Different from V
CC
Test Conditions/Comments
Industrial (A Version)
Min
–40
2.5
200
85
55
45
12.72
5.35
3.53
2.94
10.8
4.45
2.94
2.55
240
100
66
56
12.96
5.45
3.60
3.00
11.04
4.55
3.00
2.60
320
130
90
80
10
10
2.4
2.0
–1
V+ –0.25
2.5
–2–
REV. 0
ADM9264
ABSOLUTE MAXIMUM RATINGS*
(T
A
= +25°C unless otherwise noted)
ORDERING GUIDE
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
SU1, SU2, SU3, SU4 . . . . . . . . . . . . . . . . . . –0.3 V to +15 V
All Other Inputs . . . . . . . . . . . . . . . . . . –0.3 V to V
CC
+ 0.3 V
All Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
Output Current
ERR1-4,
PWROK . . . . . . . . . . . . . . . . 20 mA
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . . –40°C to +85°C
Power Dissipation, R-16A . . . . . . . . . . . . . . . . . . . 700 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . 110°C/W
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . . +300°C
Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute maximum ratings for
extended periods of time may affect device reliability.
Model
ADM9264ARN
ADM9264ARN-REEL
2
ADM9264ARN-REEL7
3
NOTES
1
R = Small Outline IC.
2
2500 devices per reel.
3
1000 devices per reel.
Temperature
Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
Option
1
R-16A
R-16A
R-16A
CAUTION
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.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–
ADM9264
PIN CONFIGURATION
GND 1
SU1 2
SU2 3
SU3 4
16 ERR1
15 ERR2
14 PWROK
13 ERR3
TOP VIEW
SU4 5 (Not to Scale) 12 ERR4
NC 6
ERRX 7
V
CC
8
11 DIS
10 ERRY
9 SU4DET
ADM9264
NC = NO CONNECT
PIN FUNCTION DESCRIPTIONS
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Mnemonic
GND
SU1
SU2
SU3
SU4
NC
ERRX
V
CC
SU4DET
ERRY
DIS
ERR4
ERR3
PWROK
Function
Ground.
Supply to Be Monitored. 12 V
±
6%.
Supply to Be Monitored. 5 V
±
7%.
Supply to Be Monitored. 3.3 V
±
7%.
Supply to Be Monitored. 2.8 V
±
5%.
No Connect.
Digital Input. Auxiliary error input (active high). When High it forces PWROK to be Low.
Supply Monitor IC Power Supply. Can be powered off any power supply between 2.5 V and 6 V
including one of the supplies being monitored (except for SU1).
Digital Input. Disable SU4. When High it causes
ERR4
to pull high through 10 kΩ external resistor to
a positive power supply.
Digital Input. Auxiliary error input (active low). When Low it forces PWROK to be Low.
Digital Input. When High it forces PWROK to be High.
Open Drain Output. Pulls high through 10 kΩ external resistor to a positive power supply when
SU4DET is high or SU4 is within its required tolerance of 2.8 V
±
5%. Pulls Low otherwise.
Open Drain Output. Low when SU3 is outside its required tolerance of 3.3 V
±
7%. Pulls High other-
wise through 10 kΩ external resistor to a positive power supply.
Open Drain Output. Pulls High through external 10 kΩ resistor to a positive power supply when SU1,
SU2, SU3 and SU4 are all within their required tolerances and when
ERRY
is High and when ERRX
is Low. Pulls Low otherwise.
Open Drain Output. Low when SU2 is outside its required tolerance of 5 V
±
7%. Pulls High other-
wise through 10 kΩ external resistor to a positive power supply.
Open Drain Output. Low when SU1 is outside its required tolerance of 12 V
±
6%. Pulls High other-
wise through 10 kΩ external resistor to a positive power supply.
15
16
ERR2
ERR1
–4–
REV. 0
ADM9264
CIRCUIT INFORMATION
Monitor Inputs SU1 to SU4
SU4DET Input
The ADM9624 is provided with four analog inputs, SU1 to
SU4, to monitor supply voltages of +12 V, +5 V, +3.3 V and
+2.8 V. Each input is connected to a window comparator con-
sisting of a pair of voltage comparators and a two-input NOR
gate. Each pair of comparators obtains a reference voltage
from a precision internal reference, and each input to be
monitored is connected to the comparators via a precision,
thin film attenuator, whose resistor ratios determine the trip
points of each comparator. As the input voltages are attenu-
ated before reaching the comparators, they may exceed the
supply voltage of the ADM9264 without exceeding the com-
mon-mode or differential input range of the comparators.
When the input voltage is within limits, the outputs of both
comparators are low, so the output of the NOR gate is high. If
the voltage on the inverting input of the low comparator falls
below the reference voltage, or the voltage on the noninverting
input of the high comparator rises above the reference voltage,
the output of the NOR gate will go low.
Error Outputs
SU4DET is a TTL-compatible input that disables the
ERR4
output, causing
ERR4
to go high when SU4DET is high. This
allows the SU4 input to be disabled easily for systems that do
not have a 2.8 V supply.
PWROK Output
The PWROK output combines the four error outputs and the
auxiliary inputs to give a common “Power OK” output. If the
four error outputs are high, ERRX is low,
ERRY
is high and
DIS is low then PWROK is high, otherwise PWROK is low.
PWROK is an open-drain output and requires a 10K pull-up
resistor to a positive supply, which may be different from V
CC
if
required. A truth table for the PWROK output is following.
Truth Table
DIS ERRX
ERRY ERR4 ERR3 ERR2 ERR1
PWROK
0
0
0
0
0
0
0
1
0
X
X
X
X
X
1
X
1
X
X
X
X
0
X
X
1
X
X
X
0
X
X
X
1
X
X
0
X
X
X
X
1
X
0
X
X
X
X
X
1
0
X
X
X
X
X
X
1
0
0
0
0
0
0
1
Error outputs
ERR1
to
ERR4
are open-drain outputs that are
OFF (high) when the corresponding input voltage is within
limits and ON (low) when the input is out of limit. Each error
output requires a 10 kΩ pull-up resistor to a positive supply,
which may be different from V
CC
if required. The open-drain
construction allows two or more of these outputs to be wire-
ANDed together if required.
Auxiliary Inputs ERRX,
ERRY
X = don’t care.
Power Supply V
CC
ERRX and
ERRY
are TTL-compatible auxiliary inputs that
allow external signals such as temperature alarms to be linked
into the ADM9264. ERRX is active high and forces PWROK
low when it is high.
ERRY
is active low and forces PWROK low
when it is low.
DIS Input
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
level from the voltage connected to the pull-up resistor, so they
are not dependent on the value of V
CC
.
The disable input, DIS, is a TTL-compatible input. It overrides
all other inputs to the PWROK logic and forces PWROK high
when it is high.
REV. 0
–5–
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