DABiC-IV, 32-BIT SERIAL-INPUT,

LATCHED SOURCE DRIVER

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/UCQ5818–F) and a controlled output slew rate.

The CMOS shift register and latches allow direct interfacing with micro-

processor-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 electromag-

netic noise, which is an important consideration in systems that include

telecommunications and/or microprocessors and to meet government emis-

sions 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-) applica-

tions. 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.

FEATURES

■ Controlled Output Slew Rate

■ High-Speed Data Storage

■ 60 V Minimum

■ High Data Input Rate

Output Breakdown

■ Low Output-Saturation Voltages

■ PNP Active Pull-Downs

■ Improved Replacements

■ Low-Power CMOS Logic

for SN75518N, SN75518NF,

and Latches

UCN5818–, and UCQ5818–

ABSOLUTE MAXIMUM RATINGS

Continuous Output Current Range,

Input Voltage Range,

Package Power Dissipation,

(Suffix ‘E–’) .................. -40°C to +85°C

(Suffix ‘K–’) ................ -40°C to +125°C

(Suffix ‘S–’) .................. -20°C to +85°C

Storage Temperature Range,

Caution: These CMOS devices have input

static protection (Class 2) but are still

susceptible to damage if exposed to

extremely high static electrical charges.

A6818xEP

6818

12

13

14

15

16

17

10

11

9

8

7

35

34

33

32

31

36

37

38

39

29

30

Part Number

Pb-free

Packing

(°C)

A6818EEP

–

27 pieces/tube

A6818EEP-T

Yes

–40 to 85

A6818EEPTR

–

450 pieces/13-in. reel

A6818EEPTR-T

Yes

A6818KEP

–

27 pieces/tube

A6818KEP-T

Yes

–40 to 125

A6818KEPTR

–

450 pieces/13-in. reel

A6818KEPTR-T

Yes

A6818SEP

–

27 pieces/tube

A6818SEP-T

Yes

–20 to 85

A6818SEPTR

–

450 pieces/13-in. reel

A6818SEPTR-T

Yes

Always order by complete part number: