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A6279ELP-T Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A6279ELP-T Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 18 page Description The A6278 and A6279 devices are specifically designed for LED display applications. Each of these BiCMOS devices includes a CMOS shift register, accompanying data latches, and NPN constant-current sink drivers. The A6278 contains 8 sink drivers, while there are 16 in the A6279. 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. Three package styles are provided: a DIP (type A) for through- hole applications; and for leaded surface-mount, an SOIC (type LW) and a TSSOP with exposed thermal pad (type LP). All package styles for the A6278 are electrically identical to each other, as are the A6279 package styles. All packages are lead (Pb) free, with 100% matte tin plated leadframes. 6278-DS, Rev. 2 Features and Benefits ▪ 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 Serial-Input Constant-Current Latched LED Drivers with Open LED Detection Functional Block Diagram Not to scale A6278 and A6279 Packages: 16 and 24 pin DIP (suffix A) 16 and 24 pin TSSOP (suffix LP) 16 and 24 pin SOIC (suffix LW) SERIAL DATA OUT SERIAL DATA IN LATCH ENABLE OUT0 OUT1 OUT7 (A6278) OUT15 (A6279) OUTPUT ENABLE UVLO LOGIC SUPPLY IO Regulator REXT Serial - Parallel Shift Register Control Logic Block VDD VDD CLOCK Output Control Drivers and Open Circuit Detector GND VLED Exposed Pad (LP package) Latches |
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Similar Description - A6279ELP-T |
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