6811

681 1 PRELIMINARY INFORMATION (subject to change without notice) May 15, 2000 A6811xA OUT 11 OUT 12 BLANKING SERIAL DATA OUT SERIAL DATA IN LOGIC SUPPLY CLOCK STROBE OUT 1 OUT 2 1 2 3 4 REGISTER LATCHES DABiC-IV, 12-BIT SERIAL-INPUT, LATCHED SOURCE DRIVER The A6811– devices combine a 12-bit CMOS shift register, accompanying data latches and control circuitry with bipolar sourcing outputs and pnp active pull downs. Designed primarily to drive vacuum-fluorescent displays, the 60 V and -40 mA output ratings also allow these devices to be used in many other peripheral power driver applications. The A6811– features an increased data input rate (compared with the older UCN/UCQ5811A) and a controlled output slew rate. The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 3.3 V or 5 V logic supply, typical serial-data input rates are up to 33 MHz. A CMOS serial data output permits cascade connections in applications requiring additional drive lines. Similar devices are available as the A6809– and A6810– (10 bits), A6812– (20 bits), and A6818– (32 bits). The A6811– output source drivers are npn Darlingtons, capable of sourcing up to 40 mA. The controlled output slew rate reduces electromagnetic noise, which is an important consideration in systems that include telecommunications and/or microprocessors and to meet government emissions regulations. For inter-digit blanking, all output drivers can be disabled and all sink drivers turned o...