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ADM2914-1SRQZEP

P1-P3P4-P6P7-P8
Quad UV/OV Positive/Negative
Voltage Supervisor
ADM2914-EP
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved.
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
Outputs guaranteed down to V
CC
of 1 V
Glitch immunity
62 μA supply current
16-lead QSOP package
ENHANCED PRODUCT FEATURES
Operating temperature range of −55°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
ADM2914-EP
VH1
UV
OV
REF
LATCH
VL1
VH2
VL2
VH3
VL3
VH4
VL4
09789-001
Figure 1.
GENERAL DESCRIPTION
The ADM2914-EP 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-EP 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-EP uses the internal shunt
regulator to regulate V
CC
if the supply line exceeds the absolute
maximum ratings.
The ADM2914-EP offers a latching overvoltage output that can
be cleared by toggling the
LATCH
input pin.
The ADM2914-EP is available in a 16-lead QSOP package. The
device operates over the extended temperature range of −55°C
to +125°C.
Additional application and technical information can be found
in the ADM2914 data sheet.
ADM2914-EP
Rev. 0 | Page 2 of 8
TABLE OF CONTENTS
Features .............................................................................................. 1
Enhanced Product Features ............................................................ 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings ............................................................4
ESD Caution...................................................................................4
Pin Configuration and Function Descriptions..............................5
Typical Performance Characteristics ..............................................6
Outline Dimensions ..........................................................................8
Ordering Guide .............................................................................8
REVISION HISTORY
6/11—Revision 0: Initial Version
ADM2914-EP
Rev. 0 | Page 3 of 8
SPECIFICATIONS
T
A
= −55°C to +125°C. Typical values at T
A
= 25°C, unless otherwise noted. V
CC
= 3.3 V, VLx = 0.45 V, VHx = 0.55 V,
LATCH
= V
CC
,
SEL = V
CC
, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
SHUNT REGULATOR
V
CC
Shunt Regulator Voltage, V
SHUNT
6.2 6.6 6.9 V I
CC
= 5 mA
6.2 6.6 7.0 V T
A
= −55°C to +125°C
V
CC
Shunt Regulator Load Regulation, ΔV
SHUNT
200 300 mV I
CC
= 2 mA to 10 mA
SUPPLY
Supply Voltage, V
CC
1
2.3 V
SHUNT
V
Minimum V
CC
Output Valid, V
CCR(MIN)
1 V
Supply Undervoltage Lockout, V
CC(UVLO)
1.9 2 2.1 V V
CC
rising
Supply Undervoltage Lockout Hysteresis, ΔV
CC(HYST)
5 25 50 mV
Supply Current, I
CC
62 100 μA V
CC
= 2.3 V to 6 V
REFERENCE OUTPUT
Reference Output Voltage, V
REF
0.985 1 1.015 V I
VREF
= ±1 mA
0.985 1 1.020 V T
A
= −55°C to +125°C
UNDERVOLTAGE/OVERVOLTAGE CHARACTERISTICS
Undervoltage/Overvoltage Threshold, V
UOT
492.5 500 507.5 mV
Undervoltage/Overvoltage Threshold to Output Delay, t
UOD
50 125 500 μs VHx = V
UOT
− 5 mV or VLx = V
UOT
+ 5 mV
VHx, VLx Input Current, I
VHL
±15 nA
±30 nA T
A
= −55°C to +125°C
UV
/
OV
Timeout Period, t
UOTO
6 8.5 12.5 ms C
TIMER
= 1 nF
6 8.5 14 ms T
A
= −55°C to +125°C
OV
LATCH CLEAR INPUT
OV
Latch Clear Threshold Input High, V
LATCH
(IH)
1.2 V
OV
Latch Clear Threshold Input Low, V
LATCH
(IL)
0.8 V
LATCH
Input Current, I
LATCH
±1 μA
V
LATCH
> 0.5 V
TIMER CHARACTERISTICS
TIMER Pull-Up Current, I
TIMER(UP)
−1.3 −2.1 −2.8 μA V
TIMER
= 0 V
−1.2 −2.1 −2.8 μA T
A
= −55°C to +125°C
TIMER Pull-Down Current, I
TIMER(DOWN)
1.3 2.1 2.8 μA V
TIMER
= 1.6 V
1.2 2.1 2.8 μA T
A
= −55°C to +125°C
TIMER Disable Voltage, V
TIMER(DIS)
−180 −270 mV Referenced to V
CC
OUTPUT VOLTAGE
Output Voltage High,
UV
/
OV
, V
OH
1 V
V
CC
= 2.3 V; I
UV
/
OV
= −1 μA
Output Voltage Low,
UV
/
OV
, V
OL
0.1 0.3 V
V
CC
= 2.3 V; I
UV
/
OV
= 2.5 mA
0.01 0.15 V
V
CC
= 1 V; I
UV
= 100 μA
THREE-STATE INPUT SEL
Low Level Input Voltage, V
IL
0.4 V
High Level Input Voltage, V
IH
1.4 V
Pin Voltage When Left in High-Z State, V
Z
0.7 0.9 1.1 V I
SEL
= ±10 μA
0.6 0.9 1.2 V T
A
= −55°C to +125°C
SEL High, Low Input Current, I
SEL
±25 μA
Maximum SEL Input Current, I
SEL(MAX)
±30 μA SEL tied to V
CC
or GND
1
The maximum voltage on the V
CC
pin is limited by the input current. The V
CC
pin has an internal 6.5 V shunt regulator and, therefore, a low impedance supply greater
than 6 V may exceed the maximum allowed input current. When operating from a higher supply than 6 V, always use a dropper resistor.
P1-P3P4-P6P7-P8

ADM2914-1SRQZEP

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Description:
Supervisory Circuits Quad UV/OV monitor
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