CLT3-4B Datasheet, PDF (1/13 Pages) STMicroelectronics – Current limited over-voltage protected quad digital termination

CLT3-4B
Current limited over-voltage protected quad digital termination
Features
■ 4 channel topology
■ Wide range input dc Voltage:
– V_I= - 0.3 to 30 V with R_I = 0
– V_I = - 30 to 30 V with R_I = 1.8 kΩ
– Low side configuration with common
ground
■ Current limiter:
– I_GEN = 3 mA
– Input current limiter activation voltage < 5 V
– Temperature compensated operation
■ Opto-coupler drive:
– No coupler activation below 1.5 mA input
current
■ Input protection (R_I = 1.2 kΩ):
– IEC 61000-4-2 electrostatic discharge
ESD, Class 3
In contact, ± 6 kV; in air, ± 8 kV
Level B: temporary disruption; no
change of opto-coupler state
– IEC 61000-4-5 voltage surge, Class 3
± 1000 V with 42 Ω serial resistor in
differential mode
Level B: temporary disruption
– IEC 61000-4-4 transient burst immunity
± 4 kV peak voltage; 5 kHz repetitive
rate
Level A: fully functional
■ Operating ambient temperature: - 25 to 85° C
Benefits
■ Reduced overall dissipation
■ Compact with high integration
■ Enables input to meet type 1 and 3
characteristic of IEC 61131-2 standard
■ Compatible operation with 2 and 3 wires
proximity sensor according EN60947-5-2
standard
■ Insensitive to the on state sensor impedance
■ Surface mount package for highly automated
assembly
■ Enhanced functional reliability
TSSOP20
Applications
■ Industrial automation
■ Programmable logic controller
■ Communication field bus nodes
■ Peripheral input / output modules
■ Machine tool interface
Description
The CLT3-4 is a quadruple input digital
termination device designed for 24 V dc
automation applications. It provides the front-end
circuitry of a digital input module (I/O) in industrial
automation, and drives an isolating opto-coupler.
Figure 1. Pin configuration
OUT1
OUT2
COM COM34 COM
COM COM12 COM
OUT3 OUT4
20 19 18 17 16 15 14 13 12 11
1 2 3 4 5 6 7 8 9 10
IN
IN2
ESDC ESD34
COM
COM
ESD12
VC
IN3
IN4
The pins ESD, COM_IJ, COM (pins # 1, 3, 6, 8, 10, 11,
13, 15, 16, 18, 20) must be connected together
externally. This common pad COM is enlarged to
reduce the thermal resistance and improve the device
cooling. The COM and IN pins are designed to
minimize the EMI effects on the circuit.
November 2007
Rev 5
1/13
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