Quad UV/OV Positive/Negative

Voltage Supervisor

ADM2914

Rev. B

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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

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

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

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 allows 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

greater than 10 mA. The ADM2914 uses the internal shunt

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.