UCN5812F

5812-F UCN5812EPF SERIAL DATA OUT LOGIC SUPPLY LOAD SUPPLY OUT20 SERIAL DATA IN OUT19 OUT 1 BiMOS II 20-BIT SERIAL-INPUT, LATCHED SOURCE DRIVERS WITH ACTIVE-DMOS PULL-DOWNS 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 also allow them to be used in other peripheral power driver applications. They are improved versions of the original UCN5812A/EP. 25 24 REGISTER REGISTER LATCHES LATCHES Data Sheet 26182.26B V DD 28 VBB 27 26 4 3 2 1 OUT18 5 6 7 8 9 10 OUT 2 23 22 21 20 19 OUT 8 The CMOS shift register and latches 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 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 are high-voltage pnp-npn Darlingtons with a minimum breakdown of 60 V and are capable o...