A6818EEP-T

The A6818 devices combine a 32-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 A6818 features an increased data input rate (compared with the older UCN/UCQ5818F) 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 A6810 (10 bits) and A6812 (20 bits).

The A6818 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 on with a BLANKING input high. The pnp active pull-downs will sink at least 2.5 mA.

Three temperature ranges are available for optimum performance in commercial (suffix S-), industrial (E-), and extended industrial (K-) applications. The package style provided is the minimum-area surface-mount PLCC (suffix -EP). Copper lead frames, low logic-power dissipation, and low output-saturation voltages allow these devices to drive most multiplexed vacuum-fluorescent displays over the maximum operating temperature range.

The lead (Pb) free versions have 100% matte tin leadframe plating.