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Allegro Announces a New 16-Bit Serial-Input, Constant-Current
Latched LED Driver with Open LED Detection
Staggered Output Delay improves noise immunity 
Worcester, MA, Dec. 22, 2005 — Allegro MicroSystems, Inc. announces a new LED driver specifically designed for LED-display applications. Each BiCMOS device includes a 16-bit CMOS shift register, accompanying data latches, and 16 channels constant-current sink drivers. Allegro's A6279 provides the user with an open LED feature that allows the user to quickly identify system problems. The A6279 is the only industry-integrated solution with a staggered output delay to improve noise immunity performance.
The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 3.3V or 5V logic supply, typical serial data-input rates are up to 25 MHz. The LED drive current is determined by the user's selection of a single resistor.
A CMOS serial data output permits cascade connections in applications requiring additional drivelines. Opened LED connections can be detected and fed back to the host microprocessor through the serial data out pin. Three package styles are provided, including through-hole DIP (suffix A), surface-mount SOIC (suffix LW) and exposed pad TSSOP (suffix LP) applications. Compliant with RoHS.
About Allegro
Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power and Hall-effect sensor integrated circuits. Allegro's innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worcester, Massachusetts (USA) with design and applications centers located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.
Editorial Contact:
Stephanie Fennelly
Director - Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com