Quad UV/OV Positive/Negative
Voltage Supervisor
Data Sheet
ADM2914
Rev. F Document Feedback
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FEATURES
Quad UV/OV positive/negative supervisor
Supervises up to 2 negative rails
Adjustable UV and OV input thresholds
High threshold accuracy over temperature: ±1.5%
1 V buffered reference output
Open-drain
UV
and
OV
reset outputs
Adjustable reset timeout with disable option
Outputs guaranteed down to V
CC
of 1 V
Glitch immunity
62 μA supply current
16-lead QSOP package
APPLICATIONS
Server supply monitoring
FPGA/DSP core and I/O voltage monitoring
Telecommunications equipment
Medical equipment
FUNCTIONAL BLOCK DIAGRAM
TIMER
TIMER
CC
LOGIC
OUTPUT
LOGIC
REF
500mV
500mV
500mV
500mV
MUX
SEL GND
ADM2914
VH1
UV
OV
REF
LATCH/DIS
VL1
VH2
VL2
VH3
VL3
VH4
VL4
08170-001
Figure 1.
GENERAL DESCRIPTION
The ADM2914 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 allow each rail to be monitored for both overvoltage (OV)
and undervoltage (UV) conditions. A common active low
undervoltage (
UV
) and overvoltage (
OV
) pin is shared by each
of the monitored voltage rails.
The ADM2914 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 V
CC
pin to limit the current flow into the V
CC
pin to no
greater than 10 mA. The ADM2914 uses the internal shunt
regulator to regulate V
CC
if the supply line exceeds the absolute
maximum ratings.
The ADM2914 is available in two models. The ADM2914-1
offers a latching overvoltage output that can be cleared by
toggling the
LATCH
input pin. The ADM2914-2 has a disable
pin that can override and disable both the
OV
and
UV
output
signals.
The ADM2914 is available in a 16-lead QSOP package. The
device operates over the extended temperature range of −40°C
to +125°C.
