6275

6275 8-BIT SERIAL-INPUT, CONSTANTCURRENT LATCHED LED DRIVER A6275ELW GROUND SERIAL DATA IN CLOCK LATCH ENABLE OUT 0 OUT 1 OUT 2 OUT 3 1 2 3 4 5 6 7 8 CK L REGISTER LATCHES 12 11 10 9 OE VDD IO REGULATOR 16 15 14 13 LOGIC SUPPLY REXT SERIAL DATA OUT OUTPUT ENABLE OUT 7 OUT 6 OUT 5 OUT 4 The A6275EA and A6275ELW are specifically designed for LEDdisplay applications. Each BiCMOS device includes an 8-bit CMOS shift register, accompanying data latches, and eight npn constantcurrent 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 16-bit devices are available as the A6276EA and A6276ELW. Two package styles are provided for through-hole DIP (suffix A) or surface-mount SOIC (suffix LW). Under normal applications, copper lead frames and low logic-power dissipation allow these devices to sink maximum rated current through all outputs continuously over the operating temperature range (90 mA, 0.9 V drop, +85°C). Both devices are also available for operation over the standard temper...