6276

Data Sheet 26185.201B† 6276 16-BIT SERIAL-INPUT, CONSTANTCURRENT LATCHED LED DRIVER A6276ELW GROUND SERIAL DATA IN CLOCK LATCH ENABLE OUT 0 OUT 1 OUT 2 OUT 3 OUT 4 OUT 5 OUT 6 OUT 7 1 2 3 4 5 6 7 8 9 10 11 12 CK L REGISTER LATCHES 20 19 18 17 16 15 14 13 OE VDD IO REGULATOR 24 23 22 21 LOGIC SUPPLY REXT SERIAL DATA OUT OUTPUT ENABLE OUT 15 OUT 14 OUT 13 OUT 12 OUT 11 OUT 10 OUT 9 OUT 8 The A6276EA and A6276ELW are specifically designed for LEDdisplay applications. Each BiCMOS device includes a 16-bit CMOS shift register, accompanying data latches, and 16 npn constant-current sink drivers. Except for package style and allowable package power dissipation, the two devices are identical. The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 5 V logic supply, typical serial data-input rates are up to 20 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 drive lines. For inter-digit blanking, all output drivers can be disabled with an ENABLE input high. Similar 8-bit devices are available as the A6275EA and A6275ELW. Two package styles are provided for through-hole DIP (suffix A) or surface-mount SOIC (suffix LW). 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 temp...