Dual Termination Device optimizes 24 Vdc input modules.

Press Release Summary:

Housed in TSSOP14 package, Model PCLT-2AT4 provides EMI protection for 24 Vdc input modules and is designed to achieve Type 1, 2, and 3 characteristics of IEC61131-2 standard. Each of 2 channels terminates connection between high-side proximity sensor and input of I/O module. Current limit is programmable with single external resistor to 7.2-2.5 mA. Outputs can be configured as opto-coupler drivers, or as CMOS outputs to drive bus controller directly, under single input control.

Original Press Release:

Sensor Termination Chip from STMicroelectronics Improves Performance of Automation Digital Inputs

Significantly reduced losses and improved EMI protection provided for 24V DC input modules

GENEVA, June 7 -- STMicroelectronics (NYSE:STM) has introduced a dual termination device designed to improve the performance and reliability of the 24V DC digital input modules used in industrial automation systems, which integrates input voltage protection, a serial current limiter and an output driver.

The PCLT-2AT4, which comes in a small TSSOP14 surface mount package, reduces considerably the cost and the board space required by traditional discrete component solutions, while dramatically cutting power losses and providing better EMI immunity. Each of the two channels terminates the connection between a high-side proximity sensor and the input of the I/O Module, and the compact device offers a flexible and easy-to-design solution for the production of highly integrated 24V interfaces.

The PCLT-2AT4 is a flexible solution to achieve Type 1, Type 2 and Type 3 characteristics of the IEC61131-2 standard, which defines equipment requirements and tests for industrial programmable logic controllers. The current limit is programmable with a single external resistor to between 7.5mA (Type 2) and 2.5mA (Type 3), and temperature compensation over the operating temperature range further reduces dissipation compared to resistive circuitry. In addition, the low thermal resistance of the exposed pad package allows the PCB cooling pad to be smaller and reduces the hot spot effect.

Input voltage clamping protects the module inputs against electromagnetic interference as defined in IEC61131-2, and in IEC61000-4-2 (1.5kV air ESD), IEC61000-4-4 (4kV fast transient burst), and IEC61000-4-6-5 (0.5 to 1kV voltage surge). The inputs are protected against -30V steady state reverse polarity. With a 750 ohm series resistor the operating input voltage range is a wide -30V to +35V.

The outputs can be configured as opto-coupler drivers, or as CMOS outputs to drive a bus controller directly, under single input control. Outputs are disabled in both modes when the input current is less than 2mA, in accordance with IEC61131-2. In addition, an LED driver is powered by the input current, providing visual indication of the input logic state.

The PCLT-2AT4 joins ST's existing CLT3-4BT6 quad termination, which is designed to meet the IEC61131-2 Type 3 characteristic. The new device is available now in sample quantities. US pricing is $0.70 each for 1,000 units.

Further information is available at http://www.st.com/thyristors

This press release is also available at
... with links to further information on the PCLT-2AT4

About ST's MPA Group (Micro, Power, Analog)
STMicroelectronics is a world leader in offering complete system solutions that leverage its rich portfolio of Microcontrollers, Power and Analog products; advanced process and design technologies; and application expertise. MPA's emphasis on solutions allows the Company to minimize time-to-market for all customers worldwide in existing and emerging applications.

About STMicroelectronics
STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence markets. The Company's shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2005, the Company's net revenues were $8.88 billion and net earnings were $266 million. Further information on ST can be found at www.st.com/.

CONTACT: Michael Markowitz, +1-212-821-8959, michael.markowitz@st.com, of STMicroelectronics


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