±0.8% Accurate Quad UV/OV
Positive/Negative Voltage Supervisor
Data Sheet
Rev. F Document Feedback
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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 V
CC
of 0.9 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
V
CC
LOGIC
OUTPUT
LOGIC
REF
500mV
500mV
500mV
500mV
MUX
SEL
GND
ADM12914
VH1
UV
OV
REF
L
A
TCH/DIS
VL1
VH2
VL2
VH3
VL3
VH4
VL4
08265-001
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 V
CC
pin to limit the current flow into the V
CC
pin at a level
no greater than 10 mA. The ADM12914 uses the internal shunt
regulator to regulate V
CC
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.
