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Part Number: CLT3-4BT6
Description: The CLTx-4 is a quadruple input digital termination device designed for 24 V DC automation applications. It achieves th...
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CLT3-4BT6
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DataSheet
General Description
CLT3-4BT6 General Description
The CLTx-4 is a quadruple input digital termination device designed for 24 V DC automation applications. It achieves the front-end circuitry of a digital input module (I/O) in industrial automation, and drives an isolating opto-coupler.
Available in a four channels configuration, it offers a high-density termination by minimizing the external components count. It is housed in a TSSOP20 surface mount package to reduce the printed board size. Made of an input voltage protection, a serial current limiting circuit and an opto-coupler driver, each channel circuit terminates the connection between the logic input and the associated high side sensor or switch.
The CLT3-4 is a 3 mA quad channel device compatible the type 1 characteristics of the IEC61131-2 standard.
Each input voltage clamping block protects the module input against electromagnetic interferences such as those described in the IEC61131-2 standard and IEC61000-4-2 (ESD), 4-4 (transient burst), 4-5 (voltage surge) standards. The supply input is also designed with such a protection structure.
The current limiting circuit connected between the input and the output pins is compensated all over the temperature range. Thanks to its low tolerance, the current limitation allows reducing drastically the dissipation of the input compared to a resistive input: the overall module requires less cooling capability and becomes smaller.
The output block of each termination channel controls the operation of an opto-coupler that is enabled by a Light Emitting Diode.
When the input current is less than 1.5 mA, this output circuit derivates the input current to maintain theopto-coupler off.
The original structure of the CLT limiter allows its activation threshold to be low and insensitive to the output voltage up to a maximum value of 2.0 V.
When the CLT input voltage VIN is higher than 5 V, or the module input voltage Vi higher than 11 V with the use of a reverse diode and a serial resistor RI = 1.2 kW, the output current that is a share of the input current (3/4) is higher than 1.5 mA. The whole termination channel including the opto-coupler is on.
CLT3-4BT6 Maximum Ratings
Symbol |
Pin |
Parameter name & conditions |
Value |
Unit |
| VCC | VC | Supply steady state voltage, RC = 0kW | - 0.3 to 30 | V |
| Supply steady state voltage, RC = 4.7kW | - 0.3 to 35 | V | ||
| VI (1) | IN | Input steady state voltage, RI = 0kW | - 0.3 to 30 | V |
| Input steady state voltage, RI = 1.2kW | - 0.3 to 32 | V | ||
| Input repetitive pulse voltage, RI = 1.2kW | - 0.3 to 35 | V | ||
| Input repetitive pulse voltage, RI = 1.2kW, RC = 4.7kW (2) |
- 0.3 to 30 | V | ||
| IIN | IN | Input maximum forward current, RI = 1.2kW, RC = 4.7kW |
5 | mA |
| Input maximum reverse current, RI = 1.2kW, RC = 4.7kW (2) |
20 | mA | ||
| VOM | OUT | Maximum output steady state voltage | 2.5 | V |
| IOM | OUT | Output current | - 4 to 4 | mA |
| TAMB | AII | Operating ambient temperature | - 25 to 85 | °C |
| TJ | Operating and storage junction temperature | - 25 to 150 | °C |
CLT3-4BT6 Features
4channelstopology
WiderangeinputDCVoltage:
V1=-0.3 to 30V with R1=0
V1=-30 to 35V withR1 =1.2k
Lowsideconfigurationwithcommonground
Currentlimiter:
IGEN=3mA
Inputcurrentlimiteractivationvoltage<5V
Temperaturecompensatedoperation
Opto-couplerdrive:
Nocoupleractivationbelow1.5mAinputcurrent
Inputprotection(R1=1.2K?):
IEC61000-4-2 electrostatic dischargeESD,Class3
Incontact,±6kV;in air,±8V
LevelB:temporarydisruption;nochangeofopto-couplerstate
IEC61000-4-5voltagesurge,Class3
±1000V with 42 serial resistor in differential mode
LevelB:temporary disruption
IEC61000-4-4transientburstimmunity
±4kV peak voltage;5kHz repetitive rate
LevelA:fully functional
Operating ambient temperature:-25 to85
WiderangeinputDCVoltage:
V1=-0.3 to 30V with R1=0
V1=-30 to 35V withR1 =1.2k
Lowsideconfigurationwithcommonground
Currentlimiter:
IGEN=3mA
Inputcurrentlimiteractivationvoltage<5V
Temperaturecompensatedoperation
Opto-couplerdrive:
Nocoupleractivationbelow1.5mAinputcurrent
Inputprotection(R1=1.2K?):
IEC61000-4-2 electrostatic dischargeESD,Class3
Incontact,±6kV;in air,±8V
LevelB:temporarydisruption;nochangeofopto-couplerstate
IEC61000-4-5voltagesurge,Class3
±1000V with 42 serial resistor in differential mode
LevelB:temporary disruption
IEC61000-4-4transientburstimmunity
±4kV peak voltage;5kHz repetitive rate
LevelA:fully functional
Operating ambient temperature:-25 to85
CLT3-4BT6 Typical Application
Industrial Automation
Programmable Logic Controller
Communication field busnodes
Peripheral Input/Output modules
Machine too linterface
Programmable Logic Controller
Communication field busnodes
Peripheral Input/Output modules
Machine too linterface
CLT3-4BT6 Connection Diagram
CLT3-4BT6
PDF/DataSheet Download
- Datasheet: CLT3-4BT6
- File Size: 101560 KB
- Manufacturer: STMICROELECTRONICS [STMicroelectronics]
- Click here to Download
- ·CLT3-4B
- STMicroelectronics
- CURRENT LIMITED OVER-VOLTAGE PROTECTED QUAD DIGITAL TERMINATION
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- ·CLT3-4BT6-TR
- STMICROELECTRONICS [STMicroelectronics]
- CURRENT LIMITED OVER-VOLTAGE PROTECTED QUAD DIGITAL TERMINATION
- 101560 KB
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- ·CLT8B00B02C82B
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