Worcester, Mass.—Allegro Microsystems' A6278 and A6279 are 8- and 16-output LED drivers, respectively, for the industrial, medical, and telecom markets. These drivers, with CMOS shift register, accompanying data latches, and 90-mA current-sink outputs, feature circuitry for detecting an open-LED condition and are reportedly the industry's only devices with a staggered delay (20 ns on each output) to cut the effects of inrush current, thus improving noise (EMI/EMC) immunity.
The CMOS shift register and latches, which can work off a 3.3- or 5-volt supply, allow direct interfacing with microprocessor-based systems at up to 25 MHz. LED drive current is set with a single resistor. The chip's serial output pin permits cascade connections for applications requiring additional drive lines.
Three package styles are provided for through-hole DIP (suffix A), surface-mount SOIC (suffix LW), and exposed pad TSSOP (suffix LP) applications. Under normal applications, a copper lead frame and low logic-power dissipation allow the dual in-line package to sink maximum rated current through all outputs continuously over the operating temperature range (90 mA, 0.75-volt drop at +85°C).
Click here for the A6278/A6279 data sheet. The A6278 is priced at 70 cents, and the A6279 is 95 cents each, both in quantities of 10k. They have an 8-week lead-time to market.
Allegro MicroSystems, 1-508-853-5000, www.allegromicro.com