5812-F

The UCN5812AF/EPF combine a 20-bit CMOS shift register, data latches, and control circuitry with high-voltage bipolar source drivers and active DMOS pull-downs for reduced supply current requirements. Although designed primarily for vacuum-fluorescent displays, the high-voltage, highcurrent outputs of UCN5812AF/EPF also allow them to be used in other peripheral power driver applications. They are improved versions of the original UCN5812A/EP.

The CMOS shift register and latches UCN5812AF/EPF allow direct interfacing with microprocessor-based systems. With a 5 V supply, they will operate to at least 3.3 MHz. At 12 V, higher speeds are possible. Especially useful for inter-digit blanking, the BLANKING input of UCN5812AF/EPF disables the output source drives and turns on the DMOS sink drivers. Use with TTL may require the use of appropriate pull-up resistors to ensure an input logic high.

A CMOS serial data output enables cascade connections in applications requiring additional drive lines. Similar devices are available as the UCN5810AF/LWF (10 bits), UCN5811A (12 bits), and UCN5818AF/EPF (32 bits).

The output source drivers UCN5812AF/EPF are high-voltage pnp-npn Darlingtons with a minimum breakdown of 60 V and are capable of sourcing up to 40 mA. The DMOS active pull-downs are capable of sinking up to 15 mA.

The UCN5812AF is supplied in a 28-pin dual in-line plastic package with 0.600" (15.24 mm) row spacing. For surface mounting, the UCN5812EPF is furnished in 28-lead plastic chip carrier (quad pack) with 0.050"(1.22 mm) centers. Copper lead-frames, reduced supply current requirements and lower output saturation voltages, allow continuous operation, with all outputs sourcing 25 mA, of the UCN5812AF over the operating temperature range, and the UCN5812EPF up to +75°C. UCN5812AF/EPF are also available for operation between -40°C and +85°C. To order, change the prefix from 'UCN' to 'UCQ'.