SLDS031A

– APRIL 1985 – REVISED APRIL 1993

Copyright

1993, Texas Instruments Incorporated

4

–1

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

Each Device Drives 32 Electrodes

90-V Output Voltage Swing Capability

Using Ramped Supply

15-mA Output Source and Sink Current

Capability

High-Speed Serially-Shifted Data Input

Totem-Pole Outputs

Latches on All Driver Outputs

description

The

SN65555,

SN75555,

SN65556,

and

circuits designed to drive the column electrodes of

an electroluminescent display. The SN65556 and

SN75556 output sequence is reversed from the

SN65555 and SN75555 for ease in printed-circuit-

board layout.

The devices consist of a 32-bit shift register, 32

latches, and 32 output AND gates. Serial data is

entered into the shift register on the low-to-high

transition of CLOCK. When high, LATCH ENABLE

transfers the shift register contents to the outputs

of the 32 latches. When OUTPUT ENABLE is

high, all Q outputs are enabled. Data must be

loaded into the latches and OUTPUT ENABLE

ramped up.

Serial data output from the shift register can be

used to cascade shift registers. This output is not

affected

by

LATCH

ENABLE

or

OUTPUT

ENABLE.

The SN65555 and SN65556 are characterized for

operation from

–40 C to 85 C. The SN75555 and

SN75556 are characterized for operation from

0 C to 70 C.

† BIDFET – Bipolar, double-diffused, N-channel and P-channel MOS transistors on same chip. This is a patented process.

1

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18

19

20

40

39

38

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36

35

34

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32

31

30

29

28

27

26

25

24

23

22

21

Q17

Q16

Q15

Q14

Q13

Q12

Q11

Q10

Q9

Q8

Q7

Q6

Q5

Q4

Q3

Q2

Q1

SERIAL OUT

CLOCK

GND

Q18

Q19

Q20

Q21

Q22

Q23

Q24

Q25

Q26

Q27

Q28

Q29

Q30

Q31

Q32

OUTPUT ENABLE

DATA IN

LATCH ENABLE

SN75555 ... N PACKAGE

(TOP VIEW)

Q23

Q24

Q25

Q26

Q27

Q28

Q29

Q30

Q31

Q32

NC

39

38

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32

31

30

29

18 19

7

8

9

10

11

12

13

14

15

16

17

Q11

Q10

Q9

Q8

Q7

Q6

Q5

Q4

Q3

Q2

Q1

20 21 22 23

SN65555, SN75555 ... FN PACKAGE

(TOP VIEW)

5 4

3

21

6

44

42 41 40

43

24 25 26 27 28

NC

– No internal connection