CLT3-4B Current limited over-voltage protected quad digital termination Features 4 channel topology Wide range input dc Voltage: V = - 0.3 to 30 V with R = 0 I I V = - 30 to 30 V with R = 1.8 k I I TSSOP20 Low side configuration with common ground Current limiter: Applications I = 3 mA GEN Input current limiter activation voltage < 5 V Industrial automation Temperature compensated operation Programmable logic controller Opto-coupler drive: Communication field bus nodes No coupler activation below 1.5 mA input current Peripheral input / output modules Input protection (R = 1.2 k): I Machine tool interface IEC 61000-4-2 electrostatic discharge ESD, Class 3 In contact, 6 kV in air, 8 kV Description Level B: temporary disruption no The CLT3-4 is a quadruple input digital change of opto-coupler state termination device designed for 24 V dc IEC 61000-4-5 voltage surge, Class 3 automation applications. It provides the front-end 1000 V with 42 serial resistor in circuitry of a digital input module (I/O) in industrial differential mode automation, and drives an isolating opto-coupler. Level B: temporary disruption IEC 61000-4-4 transient burst immunity Figure 1. Pin configuration 4 kV peak voltage 5 kHz repetitive rate OUT1 OUT2 COM COM34 COM COM COM12 COM OUT3 OUT4 Level A: fully functional Operating ambient temperature: - 25 to 85 C 20 19 18 17 16 15 14 13 12 11 Benefits Reduced overall dissipation 12 3 4 5 6 7 8 9 10 Compact with high integration Enables input to meet type 1 and 3 IN IN2 ESDC ESD34 COM characteristic of IEC 61131-2 standard COM ESD12 VC IN3 IN4 Compatible operation with 2 and 3 wires The pins ESD, COM , COM (pins 1, 3, 6, 8, 10, 11, IJ proximity sensor according EN60947-5-2 13, 15, 16, 18, 20) must be connected together standard externally. This common pad COM is enlarged to Insensitive to the on state sensor impedance reduce the thermal resistance and improve the device cooling. The COM and IN pins are designed to Surface mount package for highly automated minimize the EMI effects on the circuit. assembly Enhanced functional reliability November 2007 Rev 5 1/13 www.st.comCharacteristics CLT3-4B 1 Characteristics Figure 2. Functional block diagram OPTO COUPLER DRIVER IN1 OUT1 I1 0.75xILIM I1 ESD 0.25xILIM OVER VOLTAGE 1.5mA CURRENT LIMITER ILIM PROTECTION ESD12 COM12 ESD OVER CURRENT LIMITER ILIM 1.5mA VOLTAGE PROTECTION 0.25xILIM 0.75xILIM I2 I2 IN2 OUT2 OPTO COUPLER DRIVER Vc ESD BIASING TO COMPARATORS Volt Prot CIRCUIT COM ESDC OPTO COUPLER DRIVER IN3 OUT3 I3 0.75xILIM I3 ESD 0.25xILIM OVER 1.5mA VOLTAGE CURRENT LIMITER ILIM PROTECTION ESD34 COM34 ESD CURRENT LIMITER ILIM OVER 1.5mA VOLTAGE 0.25xILIM PROTECTION 0.75xILIM I4 I4 IN4 OUT4 OPTO COUPLER DRIVER Table 1. Absolute ratings (limiting values) Symbol Parameter Value Unit Supply steady state voltage, R = 0 k - 0.3 to 30 V C V V CC C Supply steady state voltage, R = 4.7 k - 30 to 30 V C Input steady state voltage, R = 0 k - 0.3 to 30 V I Input steady state voltage, R = 1.2 k - 0.3 to 32 V I (1) V IN I Input repetitive pulse voltage, R = 1.2 k - 0.3 to 35 V I Input repetitive pulse voltage, - 30 to 30 V (2) R = 1.8 k, R = 4.7 k I C Input maximum forward current, 5 mA R = 1.2 k, R = 4.7 k I C I IN IN Input maximum reverse current, 20 mA (2) R = 1.8 k, R = 4.7 k I C V OUT Maximum output steady state voltage 2.5 V OM I OUT Output current - 4 to 4 mA OM T Operating ambient temperature - 25 to 85 C AMB AII T Operating and storage junction temperature - 25 to 150 C J 1. V = V + R x I V = voltage at the input pin itself I IN I IN IN 2. According to test diagram and design recommendations described in Section 2.2. 2/13