EVALUATION KIT AVAILABLE MAX31915 Industrial, Octal, Digital Input Translator General Description The MAX31915 translates and conditions the 24V digital output of sensors and switches used in industrial, process, and building automation to 5V CMOS-compatible signals required by microcontrollers. It provides the frontend 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. 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 are 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 ultra-low-power applications and lowest possible heat dissipation, Maxim Integrated plans to offer a pin-compatible version of this device; the MAX31914. The MAX31914 uses patent-pending circuit techniques to achieve further reduction of power beyond what is possible by input current limiting alone. Contact the factory for availability. Applications ●● Digital Input Modules for Programmable Logic Controllers (PLCs) ●● Industrial Automation, Building Automation ●● Process Automation Ordering Information appears at end of data sheet. 19-7472; Rev 1; 4/15 Benefits 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 LogicSide Using a 5V Supply ●● Low Power and Low Heat Dissipation • Very Low Quiescent Current • Extremely Accurate and Stable Input Current Limiters ●● Configurability Enables a Wide Range of Standard and Custom Applications • Configurable Inputs for IEC 61131-2 Input Types 1, 2, and 3 or for Standard CMOS Logic Levels • 0.5mA to 6mA Configurable 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) MAX31915 Industrial, Octal, Digital Input Translator Block Diagram 5V 24V MAX31915 VCC24V 5V REGULATOR 5VOUT VREF SUPPLY MONITOR SENSORS UVFAULT FAULT TEMPERATURE MONITOR DB0 RIREF RT1 IN1 LOWPASS FILTER VREF GND OP1 VOLTAGE COMP VTSELECT RT8 IN8 DB1 CURRENT LIMITER µCONTROLLER OR ISOLATION INPUT CHANNEL 0 INPUT CHANNEL 7 OP8 MAX31915 Industrial, Octal, Digital Input Translator Absolute Maximum Ratings 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 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 above +70°C)...............................1773.8mW Soldering Temperature, Lead(Pb)-Free (reflow)................ 260°C Lead Temperature (soldering, 10s).................................... 300°C 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 (Note 1) TSSOP Junction-to-Ambient Thermal Resistance (θJA)......45.10°C/W Junction-to-Case Thermal Resistance (θJC)..................1°C/W 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. Recommended Operating Conditions PARAMETER Field-Supply Voltage SYMBOL CONDITIONS MIN TYP MAX UNITS 36 V VCC24V Note 2 7 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 VTSELECT = logic 0 150 kΩ DC Electrical Characteristics (TA = -40°C to +125°C, TJ ≤ +150°C, VCC24V = 7V to 36V, unless otherwise noted.) PARAMETER Field-Supply Curent SYMBOL ICC24V CONDITIONS MIN IN1–IN8 = 24V, 5VOUT = open, OP1–OP8 and all logic inputs = open MAX UNITS 1.6 2.3 mA Field-Supply Low Alarm Off-On VONUVLO Field-Supply Low Alarm On-Off VOFFUVLO Field Input Threshold, High to Low VIN1-(INF) 2.2kΩ external series resistor, VTSELECT = logic 1, RREF = 15kΩ Field Input Threshold, Low to High VIN1+(INF) 2.2kΩ external series resistor, VTSELECT = logic 1, RREF = 15kΩ 9.4 Field Input Hysterisis VHYS1(INF) 2.2kΩ external series resistor, VTSELECT = logic 1, RREF = 15kΩ 1 V VIN0-(INF) 2.2kΩ external series resistor, VTSELECT = logic 0, RREF = 150kΩ 1.7 V Field Input Threshold, High to Low www.maximintegrated.com 7 TYP 8 9 7 1.5 V 10 8.4 V V 10.5 V Maxim Integrated │ 3 MAX31915 Industrial, Octal, Digital Input Translator DC Electrical Characteristics (continued) (TA = -40°C to +125°C, TJ ≤ +150°C, VCC24V = 7V to 36V, unless otherwise noted.) PARAMETER SYMBOL Field Input Threshold, Low to High VIN0+(INF) Field Input Hysterisis CONDITIONS TYP MAX UNITS 2.2kΩ external series resistor, VTSELECT = logic 0, RREF = 150kΩ 2.2 3.5 V 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 3.4 V Input Threshold, Low to High (at IC Pin) VTH1+(INP) VTSELECT = logic 1, RREF = 15kΩ 4.4 Input Threshold Hysteresis (at IC Pin) VHYS1(INP) VTSELECT = logic 1, RREF = 15kΩ 1 V Input Threshold, High to Low (at IC Pin) VTH0-(INP) VTSELECT = logic 0, RREF = 150kΩ 1.7 V Input Threshold, Low to High (at IC Pin) VTH0+(INP) VTSELECT = logic 0, RREF = 150kΩ 2.2 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 4), VTSELECT = logic 1 MIN 3 1.5 2.26 DB1/DB0 = 0/0: no filtering Filter Time Constant Linear Regulator Output tFILTER V5VOUT 0.038 DB1/DB0 = 1/0 0.25 0.75 1.1 DB1/DB0 = 1/1 1.0 3 4.5 Max IlLOAD = 50mA 4.75 5.0 5.25 dVREGLOAD ILOAD = 1mA to 50mA ILOAD = 50mA Logic-Low Output Voltage VOL IOL = 4mA Logic-High Output Voltage VOH IOH = -4mA 4.0 All inputs have internal pullups -50 LED On-State Current www.maximintegrated.com IIL V V mA 0 0.025 Regulator Load Regulation TALRM 2.72 0.008 dVREGLINE Overtemperature Alarm 3.5 DB1/DB0 = 0/1 Regulator Line Regulation Logic Input Leakage Curent 2.45 5 ms V 10 mV 20 mV 0.4 1.0 V V -30 -15 µA (Note 5) 135 °C RREF = 15kΩ 2.2 mA Maxim Integrated │ 4 MAX31915 Industrial, Octal, Digital Input Translator AC Electrical Characteristics (TA = -40°C to +125°C, TJ ≤ +150°C, VCC24V = 7V to 36V, unless otherwise noted.) PARAMETER Input Data Rate Input Pulse Width Interchannel Propagation Delay Mismatch (Interchannel Jitter) Propagation Delay Output Rise/Fall Times (on OPn Pins) ESD SYMBOL CONDITIONS fIN DB0, DB1 = 0, 0 (filters disabled) PWIN DB0, DB1 = 0, 0 (filters disabled) ϕint tPROP tR/F MIN TYP MAX UNITS 0.5 1.3 Mbps 0.75 µs (Note 6) 12V input applied on the field-side through external 2.2kΩ resistors, RREF set to 15k, VTSELECT = 1 (Notes 7, 8) 300 Internally slew limited (with CLOAD = 0–50pF) 25 HBM, all pins ±2 HBM, IN1–IN8 with respect to GND ±15 25 ns 700 ns ns kV 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: External resistor RREF can be adjusted to set any desired current limit between 0.5mA and 6mA. Note 5: INn-to-OPn propagation delay difference between two channels on the same IC. Note 6: 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 7: The propagation delay limit is 1ms maximum when VTSEL = 0. www.maximintegrated.com Maxim Integrated │ 5 MAX31915 Industrial, Octal, Digital Input Translator Typical Operating Characteristics (TA = +25°C, RREF = 15kω, unless otherwise noted.) 1.5 1.0 14 4 24 2.0 1.5 1.0 1.5 10 -40 60 0.5 110 0 30 50 40 VCC24V = 24V 2.4 2.3 2.0 1.5 1.0 0.5 2.1 10 -40 60 5 110 INPUT-VOLTAGE HYSTERESIS vs. TEMPERATURE 15 25 ON-OFF THRESHOLD 7.6 www.maximintegrated.com ON-OFF THRESHOLD 3.0 -40 10 110 60 110 TEMPERATURE (°C) LDO LINE REGULATION 5.10 MAX31915 toc08 5.08 5.06 5.02 5.00 4.98 4.96 I5VOUT = 5mA 5.08 5.06 5VOUT VOLTAGE (V) 5.04 5.04 5.02 5.00 4.98 4.96 4.94 4.94 4.92 4.92 4.90 4.90 TEMPERATURE (°C) 3.2 LDO LOAD REGULATION 5VOUT VOLTAGE (V) OFF-ON THRESHOLD 8.8 60 3.6 3.4 35 5.10 MAX31915 toc07 RIN = 2.2I 9.6 9.4 10 3.8 FIELD-INPUT VOLTAGE (V) TEMPERATURE (°C) 9.2 9.0 OFF-ON THRESHOLD 4.0 2.8 2.6 0 2.0 RIN = 0I 4.6 4.4 4.2 MAX31915 toc09 CURRENT INPUT (mA) 2.5 5.0 4.8 INPUT-VOLTAGE HYSTERESIS (V) 3.0 MAX31915 toc06 INPUT-VOLTAGE HYSTERESIS vs. TEMPERATURE 2.2 INPUT-VOLTAGE HYSTERESIS 20 INPUT CURRENT LIMIT vs. FIELD-INPUT VOLTAGE 2.5 -40 10 INPUT CURRENT LIMIT vs. TEMPERATURE 2.6 8.0 7.8 2.5 RREF (kI) 2.7 8.6 8.4 8.2 3.5 TEMPERATURE (°C) 2.8 10.0 9.8 4.5 SUPPLY VOLTAGE (V) VINn = 24V 2.9 0 34 MAX31915 toc04 3.0 CURRENT INPUT (mA) 5.5 0.5 0.5 0 MAX31915 toc02 2.5 CURRENT LIMIT (mA) 2.0 CURRENT LIMIT vs. RREF MAX31915 toc05 SUPPLY CURRENT (mA) 2.5 3.0 SUPPLY CURRENT (mA) MAX31915 toc01 3.0 SUPPLY CURRENT vs. TEMPERATURE MAX31915 toc03 SUPPLY CURRENT vs. VCC24V FIELD SUPPLY 0 10 20 30 40 5VOUT OUTPUT CURRENT (mA) 50 6 11 16 21 26 31 36 SUPPLY VOLTAGE (V) Maxim Integrated │ 6 MAX31915 Industrial, Octal, Digital Input Translator Typical Operating Characteristics (continued) (TA = +25°C, RREF = 15kω, unless otherwise noted.) LDO OUTPUT vs. VCC24V FIELD SUPPLY 5.02 5.00 4.98 4.96 5.2 5.1 5.0 4.9 4.8 5.06 5.04 5.02 5.00 4.98 4.96 4.94 4.92 4.6 4.92 4.90 4.5 11 16 21 26 31 36 0.35 0.30 0.25 0.20 0.15 0.05 0 4.90 60 110 AMBIENT TEMPERATURE (°C) PROPAGATION DELAY vs. TEMPERATURE (FIELDPROPAGATION INPUT VOLTAGE = 18V) DELAY vs. TEMPERATURE 0 2 300 250 200 150 -40 MAX31915 toc16 MAX31915 toc16 PROPAGATION DELAY (ns) 350 450 FALL TIME 400 FALL TIME 350 300 250 RISE TIME 200 150 100 RISE TIME 10 60 TEMPERATURE (°C) -40 10 110 60 TEMPERATURE (°C) www.maximintegrated.com 110 MAX31915 toc15 FALL TIME 30 25 RISE TIME 20 15 4 10 -40 FIELD INPUT VOLTAGE (V) 60 110 TEMPERATURE (°C) (FIELD INPUT VOLTAGE = 18V) VTSELECT = 1 15kΩ RREF =600 VTSELECT = 1 550 RREF = 15kΩ 500 35 600 PROPAGATION DELAY vs. TEMPERATURE (FIELD INPUT VOLTAGE = 4.5V) MAX31915 toc17 0.10 40 OUTPUT RISE/FALL TIME (ns) CURRENT LIMIT (mA) 0.40 4.92 10 VTSELECT = 0 RREF = 100kΩ 0.45 4.94 -40 MAX31915 toc14 0.50 MAX31915 toc13 4.96 400 110 OUTPUT RISE/FALL TIME vs. TEMPERATURE 4.98 450 60 CURRENT LIMIT vs. FIELD INPUT VOLTAGE 5.00 500 10 -40 LDO OUTPUT VOLTAGE vs. TEMPERATURE 5.02 550 4.90 34 AMBIENT TEMPERATURE (°C) 5.04 100 24 SUPPLY VOLTAGE (V) 5.06 600 14 SUPPLY VOLTAGE (V) I5VOUT = 5mA 5.08 4 I5VOUT = 0mA 5.08 4.7 5.10 5VOUT VOLTAGE (V) 5.3 4.94 6 PROPAGATION DELAY (ns) 5.10 5VOUT VOLTAGE (V) 5.04 I5VOUT = 50mA 5.4 PROPAGATION DELAY (ns) 5VOUT VOLTAGE (V) 5.06 5.5 MAX31915 toc11 I5VOUT = 50mA 5.08 5VOUT OTPUT VOLTAGE (V) MAX31915 toc10 5.10 LDO OUTPUT VOLTAGE vs. TEMPERATURE MAX31915 toc12 LDO LINE REGULATION VTSELECT = 0 RREF = 100kΩ 550 FALL TIME 500 450 400 350 RISE TIME -40 10 60 110 TEMPERATURE (°C) Maxim Integrated │ 7 MAX31915 Industrial, Octal, Digital Input Translator Pin Configuration www.maximintegrated.com N.C. 1 VTSELECT 38 GND 2 37 OP1 N.C. 3 36 OP2 DB0 4 35 OP3 DB1 5 34 OP4 N.C. 6 33 OP5 IN1 7 32 OP6 RT1 8 31 OP7 IN2 9 30 OP8 RT2 10 29 IN8 IN3 11 28 RT8 RT3 12 27 IN7 IN4 13 26 RT7 RT4 14 25 IN6 IN5 15 24 RT6 RT5 16 23 FAULT RIREF 17 22 UVFAULT N.C. 18 21 N.C. VCC24V 19 20 5VOUT + MAX31915 EP Maxim Integrated │ 8 MAX31915 Industrial, Octal, Digital Input Translator Pin Description PIN NAME 1, 3, 6, 18, 21 N.C. 2 VTSELECT 4 DB0 5 DB1 FUNCTION No Connection Selects input trip points to be CMOS or IEC 61131-2 compliant. Logic 0 = CMOS compliant Logic 1 = IEC 61131-2 compliant Debounce (Filtering) Time Select Inputs DB1 DB0 TIME CONSTANT OF FILTER APPLIED 0 0 0 (no filtering) 0 1 0.025ms 1 0 0.75ms 1 1 3ms 7, 9, 11, 13, 15, 25, 27, 29 IN1–IN8 8, 10, 12, 14, 16, 24, 26, 28 RT1–RT8 17 RIREF 19 VCC24V Field-Supply Voltage 20 5VOUT 5V Regulator Output 22 UVFAULT 23 FAULT 30–37 OP8–OP1 38 GND — EP Field Input n. IN1 is pin 7 and IN8 is pin 29. Energyless LED Driver Outputs. Connect to GND if LEDs are not required. RT1 is pin 8 and RT8 is pin 28. Current-Limiter Reference Resistor Indicates Low Supply Voltage Alarm (Active Low) Indicates Hot Temperature Alarm. This is OR’ed with the UVFAULT indicator (active low). Logic Output n. OP1 is is 37. OP8 is pin 30. Field Ground Exposed Pad. Must connect EP to the PCB ground plane. 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 deter- www.maximintegrated.com mining 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. Maxim Integrated │ 9 MAX31915 Glitch Filter A digital glitch filter provides debouncing and filtering of the noisy sensor signals. The time constant of this filter is selectable between 0 (i.e., no filtering), 25µs, 0.75ms, and 3ms. The selection is achieved through pins DB0 and DB1. The 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. Temperature Monitoring Industrial, Octal, Digital Input Translator Powering the Device Through the 5VOUT Pin The device can alternatively 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 1) 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. 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 monitors 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 microcontroller 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. JUMPERS TO 5V AND GND Figure 1: Basic Application Powered Through 5VOUT www.maximintegrated.com Maxim Integrated │ 10 MAX31915 Industrial, Octal, Digital Input Translator Typical Application Circuit JUMPERS TO 5VOUT AND GND 24V R1 D1 5VOUT VCC24V C0 D0 C1 DB0 C2 DB1 MAX31915 EARTH C4 VTSELECT RINX FIN1–FIN8 C3 IN1–IN8 OP1–OP8 FAULT RT1–RT8 UVFAULT RIREF GND LED1– LED8 RREF GROUND 0V C5 EARTH NOTE: NOT ALL THE EXTERNAL COMPONENTS INDICATED ON THE DIAGRAM ARE REQUIRED FOR THE OPERATION OF THE IC. Table 1. Recommended Components 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 rectifier (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 Note: For higher EFT performance, a minimum 1nF, 1000V capacitor can be added from nodes FIN1–FIN8 to earth or ground. For alternative methods to improve EFT robustness, please check the Maxim website regularly for upcoming application notes currently being developed. www.maximintegrated.com Maxim Integrated │ 11 MAX31915 Industrial, Octal, Digital Input Translator Chip Information Ordering Information TEMP RANGE PIN-PACKAGE CARRIER MAX31915AUI+ -40°C to +125°C 38 TSSOP-EP* Bulk MAX31915AUI+T -40°C to +125°C 38 TSSOP-EP* Tape and reel PART +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. *EP = Exposed pad. www.maximintegrated.com PROCESS: BiCMOS Package Information ●● For the latest package outline information and land patterns (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. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 38 TSSOP-EP U38E+3 21-0714 90-0435 Maxim Integrated │ 12 MAX31915 Industrial, Octal, Digital Input Translator Revision History REVISION NUMBER REVISION DATE 0 12/14 Initial release 1 4/15 Fixed IEC diagram and added 5VOUT description DESCRIPTION PAGES CHANGED — 11-12 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. 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 specifications 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. © 2014 Maxim Integrated Products, Inc. │ 13