Parasitically Powered Digital Input

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1 EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. General Description The is an IEC compliant, industrial digital input (DI) device that translates a 24V digital industrial input to a 2.4mA (typ) current for driving optical isolators. Voltage thresholds and current levels in the are compliant with Type 1 and Type 3 inputs, while minimizing power dissipation. The is also compliant with 48V inputs, with the addition of external resistors. Operating power is derived from the input signal, eliminating the need for an external field-side power supply. A 250ns (max) fast response time is ideal for high-speed inputs. Additionally, a CMOS-compatible test input is available for safety diagnostics. The features robust functionality for harsh industrial systems and is capable of normal operation with input signals ranging from -60V to +60V. Integrated thermal shutdown further protects the device when V CC is present. The is available in a small, 6-lead SOT23 package and operates over the -40 C to +125 C ambient temperature range. Applications Process Automation Industrial Automation Motor Controls Individually Isolated Inputs Current Sourcing Inputs Benefits and Features High Integration for Flexible Circuit Designs 250ns (max) Response Time Parasitically Powered from the Field Input Current Sourcing Input with Optical Isolators Current Sinking Input with Optical Isolators Current Sinking Input with Logic Devices Test Pulse Input Reduced Power and Heat Dissipation Current Limited Input Robust Design Operates from -60V to +60V Input Voltage -40 C to +125 C Ambient Operating Temperature Ordering Information appears at end of data sheet. Simplified Block Diagram 2.3mA T REF ; Rev 0; 12/17

2 Absolute Maximum Ratings (All voltages referenced to, unless otherwise stated) V CC V to +6V...-70V to +60V V to +6V (3.0V V CC 5.5V) V to (V CC + 0.3V) (V CC = 0V) V to min [(V + 0.3V), +6V] (3.0V V CC 5.5V) V to (V CC + 0.3V) (V CC = 0V) V to min [(V + 0.3V), +6V] Short-Circuit Duration to...continuous Continuous Power Dissipation (T A = +70 C) 6L SOT23 (derate at 8.7mW/ C above +70 C)...696mW Operating Temperature Range Ambient Temperature C to +125 C Junction Temperature C Storage Temperature Range C to +150 C Lead Temperature (soldering, 10s) C Soldering (reflow) 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) 6L SOT23 Junction-to-Ambient Thermal Resistance (θja) Multilayer Board C/W Junction-to-Case Thermal Resistance (θjc) Multilayer Board...80 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 DC Electrical Characteristics V = 0V to 60V, V CC = 0V, T A = -40 C to +125 C, unless otherwise noted. Typical values are at V = 24V, = 40.2kΩ (±1%), and T A = +25 C. (Notes 2, 3) PARAMETER SYMBOL CONDITIONS M TYP MAX UNITS DIGITAL PUT () Functional Operating Range V _F V Voltage Upper Threshold V THU is high Voltage Lower Threshold V THL is low Current Low I L state, R EXT = V = 7V, steady 40.2kΩ, V = 3V V CC = 0V V V CC 5.5V (Note 5) V CC = 0V 7 3.0V V CC 5.5V (Note 5) V CC = 0V 1.5 ` 3.0V V CC 5.5V (Note 5) Boost Current I B V < V THU (Note 4) ma Current High I H steady state, R EXT = 40.2kΩ, V = 10V to 36V, V = 0V to 3V PUT () V CC = 0V V V CC 5.5V (Note 5) Load Voltage V Load on is an LED 0 3 V High Current I H V = 0.5V to 3V, V = 10V ma Low Current I L V < V THL, V = 0V μa Voltage High V OH 3.0V V CC 5.5V, I LOAD = 1mA (Note 5) V CC V V ma ma V Maxim Integrated 2

3 DC Electrical Characteristics (continued) V = 0V to 60V, V CC = 0V, T A = -40 C to +125 C, unless otherwise noted. Typical values are at V = 24V, = 40.2kΩ (±1%), and T A = +25 C. (Notes 2, 3) PARAMETER SYMBOL CONDITIONS M TYP MAX UNITS Voltage Low V OL 3.0V V CC 5.5V, I SK = 1mA (Note 5) 0.4 V AUXILIARY POWER SUPPLY (V CC ) Auxiliary Power Supply Range V CC (Note 6) V V CC = 3.0V Auxiliary Power Supply Current I CC V CC = 5.5V PUT Input High Threshold V H 3.0V V CC 5.5V (2/3)V CC V V CC = 0V V V CC 5.5V V CC /3 Input Low Threshold V L V CC = 0V 1.3 Input Pulldown Resistance R PD 250 kω PROTECTION Thermal Shutdown Threshold T SHDN (Note 7) 160 C Thermal Shutdown Hysteresis T SHDN_HYS 23 C ESD (All Pins) Human Body Model ±2 kv μa V Maxim Integrated 3

4 AC Electrical Characteristics V = 0V to 60V, V CC = 0V, T A = -40 C to +125 C, unless otherwise noted. Typical values are at V = 24V, = 40.2kΩ (±1%), and T A = +25 C. (Note 2) PARAMETER SYMBOL CONDITIONS M TYP MAX UNITS to Low-to-High Propagation Delay to High-to-Low Propagation Delay t PDLH t PDHL C L = 15pF, Figure 1 C L = 15pF, Figure 1 V CC = 0V, R L = 1.5kΩ V CC = 3.0V, R L is open V CC = 0V, R L = 1.5kΩ V CC = 3.0V, R L is open to Propagation Delay Jitter C L = 15pF, RMS jitter, Figure ps to Propagation Delay Skew, Part-to-Part Propagation Delay t SKEWP2P C L = 15pF, Figure 1 (Note 5) V CC = 0V or 3V, V = 11V V CC = 0V, R L = 1.5kΩ, 3.0V V CC 5.5V, R L is open low to high, high to low high to low, low to high Note 2: All units are production tested at T A = +25 C. Specifications over temperature are guaranteed by design and characterization. Note 3: All voltages are referenced to ground, unless otherwise noted. Note 4: See the Boost Current section for more information. Note 5: Not production tested. Guaranteed by design Note 6: V CC is an auxiliary supply input. When V CC is powered from an external 3V to 5.5V supply, the propagation delay is reduced and the output changes from a current souce to a CMOS output. When using power from to power the device, connect V CC to (V CC = 0V). Note 7: Thermal shutdown protection is only enabled when V CC is present. Thermal shutdown does not occur when = 0V ns ns ns μs Maxim Integrated 4

5 RL CL V tpdlh VTHU 90% VTHL tpdhl 0V + - I 10% 0mA Figure 1. Propagation Delay Test Circuit and Timing Diagram Typical Operating Characteristics (V = 24V, = 40.2kΩ (±1%), RL = 1.5kΩ on, T A = +25 C, unless otherwise noted.) CURRENT (ma) CURRENT vs. VOLTAGE (V CC = 0V) toc01 T A = +25ºC T A = +125ºC VOLTAGE (V) V CC = 0V R L = 1.5kΩ T A = -40ºC CURRENT (ma) CURRENT vs. VOLTAGE (V CC = 3.3V) toc02 T A = +125ºC T A = +25ºC VOLTAGE (V) V CC = 3.3V R L = 1.5kΩ T A = -40ºC CURRENT (ma) PUT AND PUT CURRENT vs. PUT VOLTAGE I, FALLG I, FALLG I, RISG I, RISG toc VOLTAGE (V) 10.0 UPPER VOLTAGE THRESHOLD vs. TEMPERATURE toc LOWER VOLTAGE THRESHOLD vs. TEMPERATURE toc CURRENT vs. TEMPERATURE toc V = +30V V THU (V) V THL (V) CURRENT (ma) TEMPERATURE (ºC) TEMPERATURE (ºC) TEMPERATURE (ºC) Maxim Integrated 5

6 Typical Operating Characteristics (continued) (V = 24V, = 40.2kΩ (±1%), RL = 1.5kΩ on, T A = +25 C, unless otherwise noted.) CURRENT (µa) 5 CURRENT vs. TEMPERATURE toc07 4 V = -30V TEMPERATURE (ºC) CURRENT (ma) AND CURRENT vs. RESISTANCE CURRENT CURRENT 0.5 V = 24V R EXT (Ω) toc08 PROPAGATION DELAY (ns) PROPAGATION DELAY vs. TEMPERATURE (V CC = 0V) toc09 PULSED FROM 0V-24V TEMPERATURE (ºC) t PDLH t PDHL PROPAGATION DELAY (ns) PROPAGATION DELAY vs. TEMPERATURE (V CC = 3.3V) toc10 PULSED FROM 0V-24V NO LOAD ON TEMPERATURE (ºC) t PDLH t PDHL PROPAGATION DELAY (ns) PROPAGATION DELAY vs. VOLTAGE (V CC = 0V) toc11 t PDLH t PDHL VOLTAGE (V) PROPAGATION DELAY (ns) PROPAGATION DELAY vs. VOLTAGE (V CC = 3.3V) toc12 NO LOAD ON t PDLH VOLTAGE (V) t PDHL Maxim Integrated 6

7 Pin Configurations TOP VIEW SOT23-6 Pin Description P NAME FUNCTION 1 2 Ground 3 4 Digital Input. Connect directly to the input signal. Connect suitable TVS between and for surge protection. Reference Current Resistor Connection. Connect an external 40.2kΩ (±1%) resistor between and. Test Pulse Input. When is high, toggle from low-to-high to verify that toggles from high-to-low. 5 V CC the device from a local power supply, connect V CC to a 3.0V to 5.5V source. Bypass V CC to Auxiliary Supply Input. For a parasitically powered circuit, connect V CC to. To power with a 1μF capacitor when powered from a local supply. 6 Output Signal. Connect to the anode of an optical LED, or to the input of a digital circuit. Maxim Integrated 7

8 Detailed Description The features an integrated current source, voltage comparator, and current steering network to create an input load compliant with IEC Type 1 and Type 3 24V DC inputs, while generating a drive current for opto-isolators that turn-on/-off in compliance with the voltage thresholds of the standard. The addition of external voltage-dropping resistors also allows the to operate with 48VDC inputs (see the Typical Operating Circuits). Power-Up/Power-Down As the input voltage (V) rises, the transitions through three phases of operation: Phase 1: V is rising but is inadequate to fully power the current source or voltage comparator. Any current that does flow into the is diverted to through the internal current steering switches, bypassing the optical isolator. Phase 2: V continues to increase to a level that is adequate to power the comparator and the current source, but the input voltage threshold has not been reached. The output of the internal current source continues to be diverted to. Phase 3: V exceeds the comparator threshold (V THU ), and the current is switched to the pin. If connected to an external optical isolator, the current passes through the LED and returns to the negative field input. As V drops, the phases are reversed. The internal current source is switched from to when V falls below the lower voltage threshold (V THL ). Boost Current To allow for a faster response time, the includes a boost current, IB, during power up. The boost current is used to set and stabilize the output current while the voltage on is rising (V < V THU ). When V > V THU, and the output current is enabled, the input current is the sum of both the output current and boost current (I B + I H ) for a short period before the output current is steady at 2.3mA (typ). Integrated Diagnostic () Input The features an integrated input for easy diagnostic checks. When is high, toggle from low-to-high to verify that toggles high-to-low. See Table 1. The current on is not affected during this diagnostic test. When is low, has no effect on, it remains low. Applications Information Powering the With the V CC Pin The can be powered parasitically from a digital input or from an external power supply. To power the device parastically, connect V CC to. In this configuration, power is derived from the signal on the pin. To power the device from a local power supply, connect V CC to a source between 3.0V and 5.5V. When V CC is powered, the output () changes from a current source to a CMOS output and the propagation delay from to is reduced. Layout Considerations Place the 40.2kΩ (±1%) resistor as close to the pin as possible. Too much distance between the resistor and the IC can create unwanted input current overshoots/ undershoots. Table 1. Mode Functionality < V THL Low Low < V THL High Low V THU Low High V THU High Low Maxim Integrated 8

9 Typical Operating Circuits 24V CURRENT SKG PUT 24V PROXIMITY SENSOR/ SWITCH SMAJ33CA 40.2kΩ T REF 2.3mA VDD MICROCONTROLLER 24V CURRENT SOURCG PUT 24V SMAJ33CA 40.2kΩ T REF 2.3mA VDD MICROCONTROLLER PROXIMITY SENSOR/ SWITCH Maxim Integrated 9

10 Typical Operating Circuits (continued) 48V CURRENT SKG PUT PROXIMITY SENSOR/ SWITCH 48V 1.5kΩ MELF SMAJ58CA 1.2kΩ 40.2kΩ T REF 2.3mA VDD MICROCONTROLLER REDUNDANT PUT WITH SIGNALS AND CMOS PUTS VDD PROXIMITY SENSOR/ SWITCH SMAJ33CA 40.2kΩ T REF 2.3mA GPO MICROCONTROLLER 1 24V VDD 40.2kΩ T REF 2.3mA GPO MICROCONTROLLER 2 Maxim Integrated 10

11 Chip Information PROCESS: BiCMOS Ordering Information PART TEMP RANGE P-PACKAGE AUT+ -40 C to +125 C 6 SOT23 +Denotes a lead(pb)-free/rohs-compliant package. T = Tape and reel. Package Information For the latest package outline information and land patterns (footprints), go to 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 LE NO. LAND PATTERN NO. 6-SOT23 U Maxim Integrated 11

12 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 12/17 Initial release For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at 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 Maxim Integrated Products, Inc. 12