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부품번호 ADM12914 기능
기능 Quad UV/OV Positive/Negative Voltage Supervisor
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ADM12914 데이터시트, 핀배열, 회로
Data Sheet
±0.8% Accurate Quad UV/OV
Positive/Negative Voltage Supervisor
ADM12914
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 VCC 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
VCC TIMER
ADM12914
VH1
500mV
TIMER
VL1
VH2
500mV
UV
VL2
VH3
OUTPUT
LOGIC
500mV
VL3
VH4
500mV
VL4
MUX
SEL GND
Figure 1.
OV
LOGIC
REF
LATCH/DIS
REF
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 VCC pin to limit the current flow into the VCC pin at a level
no greater than 10 mA. The ADM12914 uses the internal shunt
regulator to regulate VCC 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.
Rev. E
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2009–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com




ADM12914 pdf, 반도체, 판매, 대치품
Data Sheet
ADM12914
SPECIFICATIONS
TA = −40°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, LATCH = VCC,
SEL = VCC, DIS = open, unless otherwise noted.
Table 1.
Parameter
SHUNT REGULATOR
VCC Shunt Regulator Voltage
VCC Shunt Regulator Load Regulation
SUPPLY
Supply Voltage1
Minimum VCC Output Valid
Supply Undervoltage Lockout
Supply Undervoltage Lockout Hysteresis
Supply Current
REFERENCE OUTPUT
Reference Output Voltage
UNDERVOLTAGE/OVERVOLTAGE CHARACTERISTICS
Undervoltage/Overvoltage Threshold
Undervoltage/Overvoltage Threshold to Output Delay
VHx, VLx Input Current
UV/OV Timeout Period
OV LATCH CLEAR INPUT
OV Latch Clear Threshold Input High
OV Latch Clear Threshold Input Low
LATCH Input Current
DISABLE INPUT
DIS Input High
DIS Input Low
DIS Input Current
TIMER CHARACTERISTICS
TIMER Pull-Up Current
TIMER Pull-Down Current
TIMER Disable Voltage
OUTPUT VOLTAGE
Output Voltage High UV/OV
Output Voltage Low UV/OV
THREE-STATE INPUT SEL
Low Level Input Voltage
High Level Input Voltage
Pin Voltage when Left in High-Z State
SEL High, Low Input Current
Maximum SEL Input Current
Symbol Min Typ Max Unit Test Conditions/Comments
VSHUNT
6.3 6.6 6.8 V
ICC = 5 mA
ΔVSHUNT
150 mV ICC = 2 mA to 10 mA
VCC
VCCR(MIN)
VCC(UVLO)
ΔVCC(HYST)
ICC
2.3
1.94
15
2
25
62
VSHUNT
0.9
2.06
35
100
V
V
V
mV
μA
DIS = 0 V
DIS = 0 V, VCC rising
DIS = 0 V
VCC = 2.3 V to 6.0 V
VREF
0.994 1
1.008 V
IVREF = ±1 mA
VUOT
tUOD
IVHL
tUOTO
496 500 504 mV VCC = 2.3 V to 6.0 V
100 200 350 μs VHx = VUOT − 5 mV or VLx = VUOT + 5 mV
±10 nA
7.5 8.5 10.5 ms CTIMER = 1 nF
VLATCH(IH)
VLATCH(IL)
ILATCH
1.2
V
0.8 V
50 nA VLATCH > 0.5 V
VDIS(IH)
VDIS(IL)
IDIS
1.2
1.25 2
V
0.8 V
2.75 μA VDIS > 0.5 V
ITIMER(UP)
−1.7 −2.1 −2.5 μA VTIMER = 0 V
ITIMER(DOWN) 1.7
2.1 2.5
μA VTIMER = 1.6 V
VTIMER(DIS) −180 −270
mV Referenced to VCC
VOH 1
V VCC = 2.3 V; IUV/OV = −1 μA
VOL
0.1 0.3 V
VCC = 2.3 V; IUV/OV = 2.5 mA
0.01 0.15 V
VCC = 0.9 V; IUV = 100 μA
VIL
VIH
VZ
ISEL
ISEL(MAX)
0.4 V
1.4 V
0.8 0.9 1.0 V
ISEL = ±10 μA
±25 μA
±30 μA SEL tied to VCC or GND
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
exceeding 6 V may exceed the maximum allowable input current. When operating from a higher supply than 6 V, always use a dropper resistor.
Rev. E | Page 3 of 16

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ADM12914 전자부품, 판매, 대치품
ADM12914
Data Sheet
Pin No.
ADM12914-1 ADM12914-2
15 15
16 16
Mnemonic
TIMER
VCC
Description
Adjustable Reset Delay Timer. Connect an external capacitor to the TIMER pin to program
the reset timeout delay. Refer to Figure 15 in the Typical Performance Characteristics
section. Connect this pin to VCC to bypass the timer.
Supply Voltage. VCC operates as a direct supply for voltages up to 6 V. For voltages greater
than 6 V, it operates as a shunt regulator. A dropper resistor must be used in this
configuration to limit the current to less than 10 mA. When used without the resistor, the
voltage at this pin must not exceed 6 V. A 0.1 μF bypass capacitor or greater should be
used.
1 N/A means not applicable.
Rev. E | Page 6 of 16

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관련 데이터시트

부품번호상세설명 및 기능제조사
ADM12914

Quad UV/OV Positive/Negative Voltage Supervisor

Analog Devices
Analog Devices

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