General Description
The MAX31914 translates and conditions the 24V digi-
tal output of sensors and switches used in industrial,
process, and building automation to 5V CMOS-compatible
signals required by microcontrollers. It provides the front-
end interface circuit of a programmable logic controller
(PLC) digital input module.
The signal voltage translation is performed in conjunction
with input current limiting and lowpass filtering. Input
current limiting allows a significant reduction in power
consumed from the field-supply voltage, as compared
to traditional discrete resistor-divider implementations.
To achieve the lowest in-class power dissipation, the IC
uses patent-pending circuit techniques to achieve further
reduction of power dissipation beyond what is possible
by input current limiting alone. This special low-power
operating mode is automatically activated when on-chip
lowpass filtering is selected.
Selectable on-chip lowpass filters allow flexible debouncing
and filtering of sensor inputs based on the application.
When no filtering is selected, the IC is capable of detecting
pulses as short as 0.75µs at its field inputs.
All 8 input channels are translated to CMOS logic levels and
presented in parallel on the eight output pins for direct or
galvanically isolated interface with a controller ASIC or
micro.
The on-chip 5V voltage regulator can be used to power
external optocouplers, digital isolators, or other external
5V circuitry.
For low-cost applications, Maxim Integrated offers a pin
compatible version of this device, the MAX31915, which
does not include the current-switching circuitry included
in the MAX31914.
Applications
●Digital Input Modules for Programmable
Logic Controllers (PLCs)
●Industrial Automation, Building Automation
●Process Automation
Benets and Features
●Flexible Supply Options Enables Usage in 24V, 12V,
and 5V Supplied Systems
• 7V to 36V Wide Operating Field-Supply Range
• Device Can Be Optionally Powered from the Logic-
Side Using a 5V Supply
●Low Power and Low Heat Dissipation
• Very Low Quiescent Current
• Extremely Accurate and Stable Input Current Limiters
• Special Ultra-Low-Power Operating Mode with
Switched Current Limiters
●Configurability Enables a Wide Range of Standard
and Custom Applications
• Congurable Inputs for IEC 61131-2 Input Types 1,
2, and 3 or for Standard CMOS Logic Levels
• 0.5mA to 6mA Congurable Input Current Limiting
• Selectable Input Filtering and Debounce: 0, 25µs,
0.75ms, and 3ms Settings
●High Integration Reduces BOM Count and Board
Space
• 8 High-Voltage Input Channels (36V Max)
• 8 CMOS Logic Outputs for High-Speed Simultaneous
Transfer of All Input States to the Controller
• On-Chip 5V Regulator
• On-Chip Overtemperature Indicator
• On-Chip Field-Supply Voltage Monitor
• High HBM ESD Immunity on all Field Input Pins
(15kV HBM)
Ordering Information appears at end of data sheet.
MAX31914 Ultra-Low Power Industrial, Octal,
Digital Input Translator
19-7474; Rev 1; 4/15
EVALUATION KIT AVAILABLE
MAX31914 Ultra-Low Power Industrial, Octal,
Digital Input Translator
MAX31914
5V REGULATOR
24V
SENSORS
SUPPLY MONITOR
SWITCHED
CURRENT LIMITER
INPUT CHANNEL 7
INPUT CHANNEL 0
VOLTAGE
COMP
TEMPERATURE
MONITOR
LOWPASS
FILTER
V
REF
5VOUT
OP1
OP8
UVFAULT
V
CC24V
RIREF
RT1
IN1
VTSELECT
RT8
IN8
GND
V
REF
FAULT
DB0
DB1
5V
µCONTROLLER
OR
ISOLATION
Block Diagram
Voltage on VCC24V Relative to GND ....................-0.3V to +45V
Voltage on IN1–IN8 Relative to GND
through 2.2kΩ Resistors ..................................... -45V to +45V
Voltage on DB0/DB1,
VTSELECT Relative to GND ..................... -0.3V to 6V + 0.3V
Ambient Temperature Range ........................... -40°C to +125°C
Junction Temperature Range ........................... -40°C to +150°C
Storage Temperature Range ............................ -55°C to +125°C
Continuous Power Dissipation (TA = +70°C)
(derate 22.2mW/°C above +70°C) .........................1773.8mW
Soldering Temperature, Lead(Pb)-Free (reflow) ............... 260°C
Lead Temperature (soldering, 10s) ................................... 300°C
TSSOP
Junction-to-Ambient Thermal Resistance (θJA) .....45.10°C/W
Junction-to-Case Thermal Resistance (θJC) .................1°C/W
(Note 1)
(TA = -40°C to +125°C, TJ ≤ 150°C, VCC24V = 7V to 36V, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Field-Supply Voltage VCC24V Note 2 7 36 V
Field Inputs Voltage VInn Note 3 -0.3 +36 V
Logic Inputs Voltage VLOGIC -0.3 +5.5 V
Current-Limit Setting Resistor RREF
VTSELECT = logic 1 15 kΩ
VTSELECT = logic 0 150
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Field-Supply Curent ICC24V
IN1–IN8 = 24V, 5VOUT = open,
OP1–OP8 and all logic inputs = open 1.6 2.3 mA
Field-Supply Low Alarm Off-On VONUVLO 7 8 V
Field-Supply Low Alarm On-Off VOFFUVLO 9 10 V
Field Input Threshold, High to Low VIN1-(INF) 2.2kΩ external series resistor,
VTSELECT = logic 1, RREF = 15kΩ 7 8.4 V
Field Input Threshold, Low to High
(Note 4) VIN1+(INF) 2.2kΩ external series resistor,
VTSELECT = logic 1, RREF = 15kΩ 9.4 10.5 V
Field Input Hysterisis (Note 4) VHYS1(INF) 2.2kΩ external series resistor,
VTSELECT = logic 1, RREF = 15kΩ 1 V
Field Input Threshold, High to Low VIN0-(INF) 2.2kΩ external series resistor,
VTSELECT = logic 0, RREF = 150kΩ 1.5 1.7 V
MAX31914 Ultra-Low Power Industrial, Octal,
Digital Input Translator
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Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Thermal Characteristics
Recommended Operating Conditions
DC Electrical Characteristics
(TA = -40°C to +125°C, TJ ≤ 150°C, VCC24V = 7V to 36V, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Field Input Threshold, Low to High VIN0+(INF) 2.2kΩ external series resistor,
VTSELECT = logic 0, RREF = 150kΩ 2.2 3.5 V
Field Input Hysterisis (Note 4) VHYS0(INF) 2.2kΩ external series resistor,
VTSELECT = logic 0, RREF = 150kΩ 0.5 V
Input Threshold, High to Low
(at IC Pin) VTH1-(INP) VTSELECT = logic 1, RREF = 15kΩ 3 3.4 V
Input Threshold, Low to High
(at IC Pin) (Note 4) VTH1+(INP) VTSELECT = logic 1, RREF = 15kΩ 4.4 5 V
Input Threshold Hysteresis
(at IC Pin) (Note 4) VHYS1(INP) VTSELECT = logic 1, RREF = 15kΩ 1 V
Input Threshold, High to Low
(at IC Pin) VTH0-(INP) VTSELECT = logic 0, RREF = 150kΩ 1.5 1.7 V
Input Threshold, Low to High
(at IC Pin) VTH0+(INP) VTSELECT = logic 0, RREF = 150kΩ 2.2 3.5 V
Input Threshold Hysteresis
(at IC Pin) VHYS0(INP) VTSELECT = logic 0, RREF = 150kΩ 0.5 V
Field Pin Input Resistance RINP 0.8 kΩ
Field Input Curent Limit IINLIM
RREF = 15 kΩ (Note 5),
VTSELECT = logic 1 2.26 2.45 2.72 mA
Filter Time Constant tFILTER
DB1/DB0 = 0/0: no ltering 0
ms
DB1/DB0 = 0/1 0.008 0.025 0.038
DB1/DB0 = 1/0 0.25 0.75 1.1
DB1/DB0 = 1/1 1.0 3 4.5
Linear Regulator Output V5VOUT Max IlLOAD = 50mA 4.75 5.0 5.25 V
Regulator Line Regulation dVREGLINE ILOAD = 50mA 10 mV
Regulator Load Regulation dVREGLOAD ILOAD = 1mA to 50mA 20 mV
Logic-Low Output Voltage VOL IOL = 4mA 0.4 1.0 V
Logic-High Output Voltage VOH IOH = -4mA 4.0 V
Logic Input Leakage Curent IIL All inputs have internal pullups -50 -30 -15 µA
Overtemperature Alarm TALRM 135 °C
LED On-State Current RREF = 15kΩ, DB0, DB1 = 0, 0
(current switching disabled) 2.2 mA
MAX31914 Ultra-Low Power Industrial, Octal,
Digital Input Translator
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DC Electrical Characteristics (continued)
(TA = -40°C to +125°C, TJ ≤ 150°C, VCC24V = 7V to 36V, unless otherwise noted.)
Note 2: If a 24V supply is not available, the device can be powered through 5VOUT. In this mode of operation, the VCC24V
supply must be left unconnected. All other specifications remain identical. The field-supply alarms are asserted indicating
the absence of the 24V supply in this mode of operation.
Note 3: When using suggested external 2.2kΩ series resistors, limits of -36V to +36V apply.
Note 4: When input current switching is enabled (DB0/DB1 = 0), there is no input threshold hysteresis. In this case, the input
threshold for both falling and rising signals is the high to low threshold.
Note 5: External resistor RREF can be adjusted to set any desired current limit between 0.5mA and 6mA.
Note 6: INn-to-OPn propagation delay difference between two channels on the same IC.
Note 7: Propagation delay from field input (INn) to CMOS output (OPn). Tested with a 6.5V pulse applied directly to the device INn
pins. Propagation delay is measured between the 50% transitions of the rising and falling edges.
Note 8: The propagation delay limit is 1ms maximum when VTSEL = 0.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Data Rate fIN DB0, DB1 = 0, 0 (lters disabled) 1.3 Mbps
Input Pulse Width PWIN DB0, DB1 = 0, 0 (lters disabled) 0.75 µs
Interchannel Propagation-Delay
Mismatch (Interchannel Jitter) ϕint (Note 6) 25 ns
Propagation Delay tPROP
12V input applied on the eld side
through external 2.2kΩ resistors,
RREF set to 15k, VTSEL = 1
(Notes 7, 8)
300 700 ns
Output Rise/Fall Times
(on OPn Pins) tR/F
Internally slew limited
(with CLOAD = 0–50pF) 25 ns
ESD HBM, all pins ±2 kV
HBM, IN1–IN8 with respect to GND ±15
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AC Electrical Characteristics
Typical Operating Characteristics
(TA = +25°C, RREF = 15kω, unless otherwise noted.)
CURRENT LIMIT vs. RREF
MAX31914 toc03
RREF (kI)
CURRENT LIMIT (mA)
40 50
302010
5.5
0.5
1.5
2.5
3.5
4.5
0
INPUT CURRENT LIMIT
vs. TEMPERATURE
MAX31914 toc04
TEMPERATURE (°C)
CURRENT INPUT (mA)
1106010
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
2.0
-40
VINn = 24V
INPUT CURRENT LIMIT
vs. FIELD-INPUT VOLTAGE
MAX31914 toc05
FIELD-INPUT VOLTAGE (V)
CURRENT INPUT (mA)
352515
0.5
1.0
1.5
2.0
2.5
3.0
0
5
VCC24V = 24V
INPUT-VOLTAGE HYSTERESIS
vs. TEMPERATURE
MAX31914 toc06
TEMPERATURE (°C)
INPUT-VOLTAGE HYSTERESIS (V)
1106010
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
4.8
5.0
2.6
-40
ON-OFF THRESHOLD
OFF-ON THRESHOLD
RIN = 0I
INPUT-VOLTAGE HYSTERESIS
vs. TEMPERATURE
MAX31914 toc07
TEMPERATURE (°C)
INPUT-VOLTAGE HYSTERESIS
1106010
7.8
8.2
8.0
8.4
8.6
9.0
8.8
9.2
9.4
9.6
9.8
10.0
7.6
-40
RIN = 2.2I
OFF-ON THRESHOLD
ON-OFF THRESHOLD
LDO LOAD REGULATION
MAX31914 toc08
5VOUT OUTPUT CURRENT (mA)
5VOUT VOLTAGE (V)
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
4.90
0 40 50302010
LDO LINE REGULATION
MAX31914 toc09
SUPPLY VOLTAGE (V)
5VOUT VOLTAGE (V)
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
4.90
6363126211611
I5VOUT = 5mA
SUPPLY CURRENT
vs. TEMPERATURE
MAX31914 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
1106010
0.5
1.0
1.5
2.0
2.5
3.0
0
-40
SUPPLY CURRENT
vs. VCC24V FIELD SUPPLY
MAX31914 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
342414
0.5
1.0
1.5
2.0
2.5
3.0
0
4
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Typical Operating Characteristics (continued)
(TA = +25°C, RREF = 15kω, unless otherwise noted.)
LDO OUTPUT VOLTAGE
vs. TEMPERATURE
MAX31914 toc13
AMBIENT TEMPERATURE (°C)
5VOUT VOLTAGE (V)
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
4.90
-40 1106010
I5VOUT = 5mA
CURRENT LIMIT
vs. FIELD INPUT VOLTAGE
MAX31914 toc14
FIELD INPUT VOLTAGE (V)
CURRENT LIMIT (mA)
42
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0
0
VTSELECT = 0
RREF = 100kΩ
OUTPUT RISE/FALL TIME
vs. TEMPERATURE
MAX31914 toc15
TEMPERATURE (°C)
OUTPUT RISE/FALL TIME (ns)
1106010
20
25
30
35
40
15
-40
RISE TIME
FALL TIME
PROPAGATION DELAY vs. TEMPERATURE
(FIELD INPUT VOLTAGE = 18V)
MAX31914 toc16
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
60 11010
150
200
250
300
350
400
450
500
550
600
100
-40
VTSELECT = 1
RREF = 15kΩ
RISE TIME
FALL TIME
PROPAGATION DELAY vs. TEMPERATURE
(FIELD INPUT VOLTAGE = 4.5V)
MAX31914 toc17
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
1106010
400
450
500
550
600
350
-40
VTSELECT = 0
RREF = 100kΩ
RISE TIME
FALL TIME
LDO LINE REGULATION
MAX31914 toc10
SUPPLY VOLTAGE (V)
5VOUT VOLTAGE (V)
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
4.90
6363126211611
I5VOUT = 50mA
LDO OUTPUT
vs. VCC24V FIELD SUPPLY
MAX31914 toc11
SUPPLY VOLTAGE (V)
5VOUT OTPUT VOLTAGE (V)
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
4.5
4342414
I5VOUT = 50mA
LDO OUTPUT VOLTAGE
vs. TEMPERATURE
MAX31914 toc12
AMBIENT TEMPERATURE (°C)
5VOUT VOLTAGE (V)
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
4.90
-40 1106010
I5VOUT = 0mA
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PROPAGATION DELAY vs. TEMPERATURE
(FIELD INPUT VOLTAGE = 18V)
MAX31914 toc16
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
60 11010
150
200
250
300
350
400
450
500
550
600
100
-40
VTSELECT = 1
RREF = 15kΩ
RISE TIME
FALL TIME
5
4
336
37
38
DB0
N.C.
VTSELECT
OP2
N.C.
35
6
DB1 34
OP3
33
OP4
2
1
N.C.
OP1
OP8
GND
IN5
732
OP5
EP
12
11
10
IN2
RT1
IN1
IN3
13
RT2
9
8
RT5
RT3
14
29
30
31
RT8
28
27 IN7
26 RT7
IN8
OP7
25 IN6
17
16
15
RT4
IN4
N.C. 18
RIREF
VCC24V 19
24
FAULT
23
22 UVFAULT
21 N.C.
RT6
20 5VOUT
OP6
MAX31914
+
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Pin Conguration
Detailed Description
Principles of Operation
Input Current Clamp
The input pins (IN1–IN8) sense the state (on versus off)
of field sensors by monitoring both the voltage and the
current flowing through the sensor output. The current
sinking through these input pins rises linearly with input
voltage until the limit set by the current clamp is reached.
Any voltage increase beyond this point does not increase
the input current any further.
The value of the current clamp is adjustable through
an external resistor connected between pin RIREF and
ground. The voltage at the input pins (IN1–IN8) are
compared against internally set references to determine
if the sensor is on (logic 1) or off (logic 0). The trip points
determining the on/off status of the sensor can be selected
through pin VTSELECT as follows:
● VTSELECT = 1 selects trip points that satisfy the
requirements of IEC 61131-2 type 1, type 2, and type 3
switches.
● VTSELECT = logic 0 selects trip points that are CMOS
logic compatible and roughly centered approximately
2.5V.
Pins RT1–RT8 must be connected directly to GND to
provide a return path for the input current if LEDs are
not required for visual indication. If VTSELECT = logic 0,
RT1–RT8 must be connected directly to GND. If visual
indication is needed when VTSELECT = logic 0, then
LEDs can be connected to pins OP1–OP8 through external
current-limiting resistors.
Glitch Filter
A digital glitch filter provides debouncing and filtering of the
noisy sensor signals. The time constant of this filter is select-
able between 0 (i.e., no filtering), 25µs, 0.75ms, and 3ms.
The selection is achieved through pins DB0 and DB1. The
PIN NAME FUNCTION
1, 3, 6, 18, 21 N.C. No Connection
2 VTSELECT
Selects input trip points to be CMOS or IEC 61131-2 compliant.
Logic 0 = CMOS compliant
Logic 1 = IEC 61131-2 compliant
4 DB0 Debounce (Filtering) Time Select Inputs. These inputs also determine the current switching
frequency. See also Table 1 for details.
5 DB1
DB1 DB0 TIME CONSTANT OF FILTER APPLIED
0 0 0 (no ltering)
0 1 0.025ms
1 0 0.75ms
1 1 3ms
7, 9, 11, 13, 15,
25, 27, 29 IN1–IN8 Field Input n. IN1 is pin 7 and IN8 is pin 29.
8, 10, 12, 14,
16, 24, 26, 28 RT1–RT8 Energyless LED Driver Outputs. Connect to GND if LEDs are not required. RT1 is pin 8 and
RT8 is pin 28.
17 RIREF Current-Limiter Reference Resistor
19 VCC24V Field-Supply Voltage
20 5VOUT 5V Regulator Output
22 UVFAULT Indicates Low Supply Voltage Alarm (Active Low)
23 FAULT Indicates Hot Temperature Alarm. This is OR’ed with the UVFAULT indicator (active low).
30–37 OP8–OP1 Logic Output n. OP1 is pin 37. OP8 is pin 30.
38 GND Field Ground
— EP Exposed Pad. Must connect EP to the PCB ground plane.
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Pin Description
filtered outputs of the comparators are presented to the logic
output pins, OP1–OP8.
To provide the digital glitch filter, the device checks that an
input is stable for at least three clock cycles. The duration
of a clock cycle is 1/3 of the selected debounce time. If the
input is not stable for at least three clock cycles, the input
change is not sent to the internal shift register. See Table 1
for current-switching settings.
Low-Power Current Clamp Switching
The MAX31914 uses a switched current limiter to reduce
power consumption below what is achievable by current
limiting along. The internal filter clock is used to switch
input current between 100% and 20% of the chosen
current limit. For example, if the current limit is set to
2.4mA, the input current will switch between 2.4mA
and 0.48mA. The filter clock switches input current at a
50% duty cycle. The clock period for current switching is
automatically selected by the DB1 and DB0 glitch filter
settings. See Table 1 for current-switching settings.
Temperature Monitoring
The internal junction temperature of the IC is constantly
monitored and an alarm is raised, by asserting the FAULT
pin, if the temperature rises above TALRM.
Supply Voltage Monitoring
A primary supply voltage-monitor circuit constantly moni-
tors the field-supply voltage. If this voltage falls below a
threshold (VOFFUVLO), an alarm is raised by asserting
the FAULT and UVFAULT pins, indicating to the microcon-
troller that the part is experiencing a fault condition and
the data is not to be trusted. Once the field-supply voltage
has recovered and goes above VONUVLO, the FAULT and
UVFAULT pins are released.
Table 1. Debounce/Current Switching Period Settings
Figure 1. Operation of Switched Current Limiter
DB1 DB0 BINARY VALUE DEBOUNCE TIME CURRENT SWITCHING PERIOD
0 0 0 0 DC (disabled)
0 1 1 25µs 8µs
1 0 2 0.75ms 0.25ms
1 1 3 3ms 1ms
24V
0V tDELAY tDELAY
100% ILIMIT
20% ILIMIT
TIME
INTERNAL FILTER CLOCK
COMPARATOR OUTPUT IS LATCHED INTO FILTER ON
RISING EDGE OF CLOCK
INPUT CURRENT LIMIT
SENSOR OUTPUT VOLTAGE
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Powering the Device Through the 5VOUT Pin
The device can also be powered using a 5V supply
connected to the 5VOUT pin. In this case, a 24V supply
is no longer needed and the VCC24V supply must be
kept unconnected (see Figure 2)
In this configuration, the device will always indicate a
UVFAULT and the FAULT pin will always be active (pulled
low). Faults due to the Supply Voltage monitoring and
Temperature Monitoring will not be available.
This configuration has lower power consumption and
heat dissipation since the on-chip 5V voltage regulator is
disabled.
Figure 2. Basic Application Powered Through 5VOUT
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Typical Application Circuit
5VOUT
VCC24V
IN1–IN8
RT1–RT8
RIREF GND
DB0
DB1
24V
FIN1–FIN8
EARTH
EARTH
GROUND
JUMPERS TO
5VOUT AND GND
R1
RINX
RREF
C3 C4
0V
OP0–OP7
C2C1D0C0
C5
LED1–
LED8
FAULT
UVFAULT
VTSELECT
MAX31914
D1
NOTE: NOT ALL THE EXTERNAL COMPONENTS INDICATED ON THE DIAGRAM ARE REQUIRED FOR THE OPERATION OF THE IC.
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Table 2. Recommended Components
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Note: For higher EFT EMC performance, a minimum 1nF, 1000V capacitor can be added from nodes FIN1–FIN8 to earth ground
or ground. For additional methods to improve EFT robustness, please check the Maxim website regularly for upcoming application
notes currently being developed.
COMPONENT DESCRIPTION REQUIRED/RECOMMENDED/OPTIONAL
C0, C5 4.7nF, 2kV polypropylene capacitor Recommended
C1 10µF, 60V ceramic capacitor Required
C2 100nF, 60V ceramic capacitor Required
C3 100nF, 10V ceramic capacitor Recommended
C4 4.7μF, 10V low-ESR ceramic capacitor Required
D0 36V fast zener diode (ZSMB36) Recommended
D1 General-purpose rectier (IN4007) Optional: For reverse-polarity protection.
LED1–LED8 LEDs for visual input status indication Optional
R1 150Ω, 1/3W MELF resistor Required
RINX 2.2kΩ, 1/4W MELF resistor Required
RREF 15kΩ, 1/8W resistor Required
PART TEMP RANGE PIN-
PACKAGE CARRIER
MAX31914AUI+ -40°C to +125°C 38 TSSOP Bulk
MAX31914AUI+T -40°C to +125°C 38 TSSOP Tape and
Reel
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
38 TSSOP U38E+3 21-0714 90-0435
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Package Information
For the latest package outline information and land pat-
terns (footprints), go to www.maximintegrated.com/
packages. Note that a “+”, “#”, or “-” in the package code
indicates RoHS status only. Package drawings may show
a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
Chip Information
PROCESS: BiCMOS
Ordering Information
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 12/14 Initial release —
1 4/15 Fixed IEC diagram and added 5VOUT description. 11–13
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2015 Maxim Integrated Products, Inc.
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14
MAX31914 Ultra-Low Power Industrial, Octal,
Digital Input Translator
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
