ANALOG DEVICES ADM2914-EP Service Manual
Quad UV/OV Positive/Negative
V
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
Adjustable reset timeout
Outputs guaranteed down to 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
and OV reset outputs
UV
of 1 V
CC
VH1
VL1
VH2
VL2
VH3
VL3
VH4
VL4
Voltage Supervisor
ADM2914-EP
FUNCTIONAL BLOCK DIAGRAM
CC
ADM2914-EP
500mV
500mV
500mV
MUX
500mV
SEL GND
Figure 1.
TIMER
TIMER
OUTPUT
LOGIC
LOGIC
REF
UV
OV
LATCH
REF
09789-001
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 (
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.
UV
) and overvoltage (OV) pin is shared by each
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
pin to limit the current flow into the VCC pin to no
CC
greater than 10 mA. The ADM2914-EP uses the internal shunt
regulator to regulate V
if the supply line exceeds the absolute
CC
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.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
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Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved.
ADM2914-EP
TABLE OF CONTENTS
Features.............................................................................................. 1
Enhanced Product Features ............................................................ 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
REVISION HISTORY
6/11—Revision 0: Initial Version
Absolute Maximum Ratings ............................................................4
ESD Caution...................................................................................4
Pin Configuration and Function Descriptions..............................5
Typical Performance Characteristics..............................................6
Outline Dimensions..........................................................................8
Ordering Guide .............................................................................8
Rev. 0 | Page 2 of 8
ADM2914-EP
SPECIFICATIONS
/
OV
UV
/
OV
UV
LATCH
= −1 μA
= 2.5 mA
= VCC,
+ 5 mV
UOT
TA = −55°C to +125°C. Typical values at TA = 25°C, unless otherwise noted. VCC = 3.3 V, VLx = 0.45 V, VHx = 0.55 V,
SEL = V
, unless otherwise noted.
CC
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
SHUNT REGULATOR
VCC Shunt Regulator Voltage, V
SHUNT
6.2 6.6 7.0 V TA = −55°C to +125°C
VCC Shunt Regulator Load Regulation, ΔV
SHUNT
SUPPLY
Supply Voltage, V
Minimum VCC Output Valid, V
Supply Undervoltage Lockout, V
Supply Undervoltage Lockout Hysteresis, ΔV
Supply Current, I
CC1
CCR(MIN)
CC(UVLO)
CC(HYST)
CC
REFERENCE OUTPUT
Reference Output Voltage, V
REF
0.985 1 1.020 V TA = −55°C to +125°C
UNDERVOLTAGE/OVERVOLTAGE CHARACTERISTICS
Undervoltage/Overvoltage Threshold, V
Undervoltage/Overvoltage Threshold to Output Delay, t
VHx, VLx Input Current, I
VHL
UOT
UOD
±30 nA TA = −55°C to +125°C
UV
/OV Timeout Period, t
UOTO
6 8.5 14 ms TA = −55°C to +125°C
OV
LATCH CLEAR INPUT
OV
Latch Clear Threshold Input High, V
OV
Latch Clear Threshold Input Low, V
LATCH
Input Current, I
LATCH
LATCH
LATCH
(IH)
(IL)
TIMER CHARACTERISTICS
TIMER Pull-Up Current, I
TIMER(UP)
−1.2 −2.1 −2.8 μA TA = −55°C to +125°C
TIMER Pull-Down Current, I
TIMER(DOWN)
1.2 2.1 2.8 μA TA = −55°C to +125°C
TIMER Disable Voltage, V
TIMER(DIS)
OUTPUT VOLTAGE
Output Voltage High, UV/OV, V
Output Voltage Low, UV/OV, V
OH
OL
0.01 0.15 V
THREE-STATE INPUT SEL
Low Level Input Voltage, VIL 0.4 V
High Level Input Voltage, VIH 1.4 V
Pin Voltage When Left in High-Z State, V
Z
0.6 0.9 1.2 V TA = −55°C to +125°C
SEL High, Low Input Current, I
Maximum SEL Input Current, I
1
The maximum voltage on the VCC pin is limited by the input current. The VCC 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.
SEL
SEL(MAX)
6.2 6.6 6.9 V ICC = 5 mA
200 300 mV ICC = 2 mA to 10 mA
2.3 V
V
SHUNT
1 V
1.9 2 2.1 V VCC rising
5 25 50 mV
62 100 μA VCC = 2.3 V to 6 V
0.985 1 1.015 V I
= ±1 mA
VREF
492.5 500 507.5 mV
50 125 500 μs VHx = V
− 5 mV or VLx = V
UOT
±15 nA
6 8.5 12.5 ms C
TIMER
= 1 nF
1.2 V
0.8 V
> 0.5 V
±1 μA
−1.3 −2.1 −2.8 μA V
1.3 2.1 2.8 μA V
V
LATCH
TIMER
TIMER
= 0 V
= 1.6 V
−180 −270 mV Referenced to VCC
= 2.3 V; I
1 V
0.1 0.3 V
0.7 0.9 1.1 V I
V
CC
= 2.3 V; I
V
CC
= 1 V; IUV = 100 μA
V
CC
= ±10 μA
SEL
±25 μA
±30 μA SEL tied to VCC or GND
Rev. 0 | Page 3 of 8
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