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TELCOM SEMICONDUCTOR, INC.

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TC7211AM

BUS COMPATIBLE 4-DIGIT CMOS DECODER/DRIVER

FEATURES

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4-Digit Non-Multiplexed 7-Segment LCD Outputs

With Backplane Driver

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Input and Digit Select Data Latches

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RC Oscillator On-Chip Generates Backplane

Drive Signal

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Eliminates DC Bias Which Degrades LCD Life

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Backplane Input/Output Pin Permits

Synchronization of Cascaded Slave Device to

a Master Backplane Signal

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Binary and BCD Inputs Decoded to Code B

(0 to 9, —, E, H, L, P, Blank)

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Pin Compatible and Functionally Equivalent to

ICM7211AM

GENERAL DESCRIPTION

The TC7211AM (LCD Decoder/driver) is a CMOS di-

rect drive, 4-digit, 7-segment display decoder and driver.

The TC7211AM drives conventional LCDs. An RC os-

cillator, divider chain, backplane driver, and 28-segment

outputs are provided on a single CMOS chip. The segment

drivers supply square waves of the same frequency as the

backplane, but in-phase for an OFF segment and out-of-

phase for an ON segment. The net DC voltage applied

between driver segment and backplane is near zero maxi-

mizing display lifetime.

The four bit binary input is decoded into the seven

segment alphanumeric code known as "Code B". The "Code

B" output format results in a 0 to 9,—, E, H, L, P or blank

display. True BCD or binary inputs will be correctly de-

coded to the seven segment display format.

ORDERING INFORMATION

Driver

Input

Output

Part No.

Type

Package Code

Config.

Data and

TC7211AMIPL

LCD

40-Pin

Code B

Digit Select

Plastic DIP

Latches

PIN CONFIGURATIONS

TC7211AM-4 11/14/96

TC7211AM (LCD)

1

2

3

4

D1

5

6

7

8

9

10

11

12

A1

OSCILLATOR

B2

E1

D2

13

14

15

16

17

18

19

20

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

G1

F1

BP

A2

B2

C2

E2

G2

F2

A3

B3

C3

D3

E3

G3

F3

C1

B1

GND

B3

B1

B0

F4

G4

E4

D4

C4

B4

A4

DATA

INPUTS

CHIP SELECT 2 (CS2)

CHIP SELECT 1 (CS1)

DIGIT SELECT 2 (DS2

DIGIT SELECT 1 (DS1