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Optocouplers operate at dual supply voltages

Posted: 02 Jul 2008     Print Version  Bookmark and Share

Keywords:dual-supply voltage  digital CMOS optocouplers  isolation voltage protection  propagation delay 

Avago Technologies has expanded its family of high-speed dual-supply voltage digital CMOS optocouplers. The company's ACPL-W70L and ACPL-K73L digital CMOS stretched optocouplers operate at dual supply voltages of 3.3- and 5V at a minimum speed of 15MBd. The optocouplers provide up to 5kV isolation voltage protection and are designed to achieve lower propagation delay (55ns max.) and pulse width distortion (25ns max.) with the additional glitch-free power-up feature. This feature outputs low voltage logic during power loss and provides output logic that corresponds to the input voltage when the power supply recovers. The ACPL-W70L/K73L series targets designers of power supply, industrial, consumer, and test and measurement applications.

Avago's single-channel ACPL-W70L and two-channel ACPL-K73L come in SSO-6 and SSO-8 packages, respectively. Both optocouplers require from 40 to 50 per cent less PCB space—compared to DIP-8 packages—and meet 8mm creepage and clearance requirements. Both can operate in a wide operating temperature range from -40 to 105°C. Moreover, the ACPL-W70L/K73L series incorporates the latest CMOS IC technology to achieve superior performance with very low power consumption, claims Avago.

In addition to supporting both 3.3V and 5V supply voltages, the ACPL-W70L and ACPL-K73L are powered by low forward current of 4mA and consume very low current (Idd2 less than 7mA/ch), says the company. The ACPL-W70L/K73L optocoupler series offers non-inverting output as compared to the traditional inverting output which helps to reduce power consumption in the signal pattern with less than 50 per cent duty cycle.

The optocouplers include high-speed LEDs and CMOS detector ICs. Each detector incorporates an integrated photodiode, high-speed transimpedance amplifier, and a voltage comparator with an output driver. The ACPL-W70L/K73L optocouplers are ideal for digital fieldbus isolation, multiplexed data transmission, microprocessor system interface and DC/DC converter applications.

The ACPL-W70L/K73L series meets international safety standards such as IEC/EN/DIN EN 60747-5-2, UL1577 and CSA for reinforced insulation.

Pricing for Avago's ACPL-W70L and ACPL-K73L is Rs.65.23 ($1.63) and Rs.120.06 ($3.00) each respectively, in minimum quantities of 10,000. Samples are available now and production quantities will be available in July.

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