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ADM12914-1ARQZ Folha de dados(PDF) 1 Page - Analog Devices

Nome de Peças ADM12914-1ARQZ
Descrição Electrónicos  짹0.8% Accurate Quad UV/OV Positive/Negative Voltage Supervisor
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±0.8% Accurate Quad UV/OV
Positive/Negative Voltage Supervisor
ADM12914
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalog Devices foritsuse,nor for anyinfringements ofpatents orother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.
FEATURES
Quad undervoltage/overvoltage (UV/OV) positive/negative
supervisor
Supervises up to two negative rails
Adjustable UV and OV input thresholds
Industry leading threshold accuracy over the extended
temperature range: ±0.8%
1 V buffered reference output
Open-drain UV and OV reset outputs
Adjustable reset timeout with disable option
Outputs guaranteed down to VCC of 1 V
Glitch immunity
62 μA supply current
16-lead QSOP package
Specified from −40°C to +125°C
APPLICATIONS
Server supply monitoring
FPGA/DSP core and I/O voltage monitoring
Telecommunications equipment
Medical equipment
FUNCTIONAL BLOCK DIAGRAM
TIMER
TIMER
VCC
LOGIC
OUTPUT
LOGIC
REF
500mV
500mV
500mV
500mV
MUX
SEL
GND
ADM12914
VH1
UV
OV
REF
LATCH/DIS
VL1
VH2
VL2
VH3
VL3
VH4
VL4
Figure 1.
GENERAL DESCRIPTION
The ADM12914 is a quad voltage supervisory IC ideally suited
for monitoring multiple rails in a wide range of applications.
Each monitored rail has two dedicated input pins, VHx and VLx,
which allows each rail to be monitored for both undervoltage
(UV) and overvoltage (OV) conditions with high threshold
accuracy of ±0.8%. Common active low undervoltage (UV) and
overvoltage (OV) pins are shared by each of the monitored
voltage rails.
The ADM12914 includes a 1 V buffered reference output, REF,
that acts as an offset when monitoring a negative voltage. The
three-state SEL pin determines the polarity of the third and
fourth inputs, that is, it configures the device to monitor
positive or negative supplies.
The device incorporates an internal shunt regulator that enables
the device to be used in higher voltage systems. This feature
requires a resistor to be placed between the main supply rail and
the VCC pin to limit the current flow into the VCC pin at a level
no greater than 10 mA. The ADM12914 uses the internal shunt
regulator to regulate VCC if the supply line exceeds the absolute
maximum ratings.
The ADM12914 is available in two models. The ADM12914-1
offers a latching overvoltage output that can be cleared by
toggling the LATCH input pin. The ADM12914-2 has a disable
pin that can override and disable both the UV and the OV
output signals.
The ADM12914 is available in a 16-lead QSOP package. The
device is specified over the extended temperature range of
−40°C to +125°C.


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