|
|
PDF ADM9264 Data sheet ( Hoja de datos )
| Número de pieza | ADM9264 | |
| Descripción | Quad Power Supply Monitor for Desktop PCs | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ADM9264 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
a
Quad Power Supply Monitor
for Desktop PCs
ADM9264
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
VCC 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
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.
FUNCTIONAL BLOCK DIAGRAM
GND 1
SU1 2
SU2 3
SU3 4
SU4 5
NC 6
ERRX 7
VCC 8
L
H
L
H
L
H
L
H
VREF
ADM9264
16 ERR1
15 ERR2
PWROK
MONITOR
LOGIC
14 PWROK
13 ERR3
12 ERR4
11 DIS
10 ERRY
9 SU4DET
NC = NO CONNECT
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
1 page  
ADM9264
CIRCUIT INFORMATION
Monitor Inputs SU1 to SU4
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
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 VCC if required. The open-drain
construction allows two or more of these outputs to be wire-
ANDed together if required.
Auxiliary Inputs ERRX, ERRY
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 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 Input
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 VCC if
required. A truth table for the PWROK output is following.
Truth Table
DIS ERRX ERRY ERR4 ERR3 ERR2 ERR1 PWROK
00 1 1 1 1 1 1
0X X X X X 0
0
0X X X X 0 X 0
0X X X 0 X X 0
0X X 0 X X X 0
0X
0
XXXX
0
01
X XXXX 0
1X X X X X X 1
X = don’t care.
Power Supply VCC
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 VCC.
REV. 0
–5–
5 Page 
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
16-Lead Narrow SOIC
(R-16A)
0.3937 (10.00)
0.3859 (9.80)
16
0.1574 (4.00)
0.1497 (3.80) 1
9
0.2440 (6.20)
8 0.2284 (5.80)
0.0098 (0.25)
0.0040 (0.10)
PIN 1
0.0688 (1.75)
0.0532 (1.35)
0.0196 (0.50)
0.0099 (0.25) x 45°
SEATING
0.0500
(1.27)
PLANE BSC
0.0192 (0.49)
0.0138 (0.35)
8°
0.0099 (0.25) 0° 0.0500 (1.27)
0.0075 (0.19) 0.0160 (0.41)
ADM9264
REV. 0
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ADM9264.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ADM9264 | Quad Power Supply Monitor for Desktop PCs | Analog Devices |
| ADM9264ARN | Quad Power Supply Monitor for Desktop PCs | Analog Devices |
| ADM9264ARN-REEL | Quad Power Supply Monitor for Desktop PCs | Analog Devices |
| ADM9264ARN-REEL7 | Quad Power Supply Monitor for Desktop PCs | Analog Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |