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ADM9264ARN-ADM9264ARN-REEL
Quad Power Supply Monitor for Desktop PCs
REV.0
FEATURES
Monitoring of 12 V, 5 V, 3.3 V and 2.8 V Supplies in
Parallel
Auxiliary Sensor Inputs
Low Power: 25mA Typical
Internal Comparator Hysteresis
Power Supply Glitch Immunity
VCC from 2.5 V to 6 V
Guaranteed from –408C to +858C
No External Components
16-Pin Narrow SOIC Package (150 Mil Wide)
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Network Systems
FUNCTIONAL BLOCK DIAGRAM
Quad Power Supply Monitor
for Desktop PCs
GENERAL DESCRIPTIONThe 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.
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.
ADM9264–SPECIFICATIONSSpecifications subject to change without notice.
(VCC = Full Operating Range, TA = TMIN to TMAX unless otherwise noted)
ORDERING GUIDENOTESR = Small Outline IC.2500 devices per reel.1000 devices per reel.
ABSOLUTE MAXIMUM RATINGS*(TA = +25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
SU1, SU2, SU3, SU4 . . . . . . . . . . . . . . . . . . –0.3 V to +15 V
All Other Inputs . . . . . . . . . . . . . . . . . . –0.3 V to VCC + 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
θJA 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.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V 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.
ADM9264
PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
NC = NO CONNECT
GND
ERR3
PWROK
ERR2
ERR1
SU1
SU2
SU3
ERRY
DIS
ERR4SU4
ERRX
VCCSU4DET
CIRCUIT INFORMATION
Monitor Inputs SU1 to SU4The 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 OutputsError 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 VCC if required. The open-drain
construction allows two or more of these outputs to be wire-
ANDed together if required.
Auxiliary Inputs ERRX, ERRYERRX 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 InputThe 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.
SU4DET InputSU4DET 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 OutputThe 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 VCC if
required. A truth table for the PWROK output is following.
Truth TableX = don’t care.
Power Supply VCCThe 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 VCC.
TEMPERATURE – °C
HYSTERESIS – Volts15253545556575
0.1Figure 1.Hysteresis vs. Temperature for SU1—Low to High
TEMPERATURE – °C
HYSTERESIS – Volts
0.1Figure 2.Hysteresis vs. Temperature for SU1—High to Low
TEMPERATURE – °C
HYSTERESIS – Volts15253545556575
0.05Figure 3.Hysteresis vs. Temperature for SU2—Low to High
TEMPERATURE – °C
HYSTERESIS – Volts15253545556575
0.05Figure 4.Hysteresis vs. Temperature for SU2—High to Low
TEMPERATURE – °C
HYSTERESIS – Volts15253545556575
0.02Figure 5.Hysteresis vs. Temperature for SU3—Low to High
TEMPERATURE – °C
HYSTERESIS – Volts15253545556575
0.02Figure 6.Hysteresis vs. Temperature for SU3—High to Low
