A6279

Description

This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available.

Date of status change: October 31, 2011

Recommended substitution: For existing customer transition, and for new customers or new applications, contact Allegro Sales.

The A6279 device is specifically designed for LED display applications. This BiCMOS device includes a CMOS shift register, accompanying data latches, and NPN constant-current sink drivers. The A6279 contains 16 sink drivers.

The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 3.3 or 5 V logic supply, typical serial data-input rates can reach 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 cascading between multiple devices in applications requiring additional drive lines. Open LED connections can be detected and signaled back to the host microprocessor through the SERIAL DATA OUT pin.

Two package styles are provided: a QFN surface mount, 0.90 mm overall height nominal, and for leaded surface-mount, a TSSOP with exposed thermal pad (type LP). The packages are electrically identical to each other. Both packages are lead (Pb) free, with 100% matte tin plated leadframes.

Top Features

  • 3.0 to 5.5 V logic supply range
  • Schmitt trigger inputs for improved noise immunity
  • Power-On Reset (POR)
  • Up to 90 mA constant-current sinking outputs
  • LED open circuit detection
  • Low-power CMOS logic and latches
  • High data input rate
  • 20 ns typical staggering delay on the outputs
  • Internal UVLO and thermal shutdown (TSD) circuitry

Packaging

Two package styles are provided: a QFN surface mount, 0.90 mm overall height nominal (suffix ET), and for leaded surface-mount, a TSSOP with exposed thermal pad (type LP). The packages are electrically identical to each other. Both packages are lead (Pb) free, with 100% matte tin plated leadframes.

ET-QFN and LP-TSSOP combined