6-11

TELCOM SEMICONDUCTOR, INC.

7

6

5

4

3

1

2

8

INPUT DEFINITIONS

signals should swing over the full supply.

Input

Pin No.

Condition

Function

B0

27

GND = Logic “0”

Ones (Least Significant)

B1

28

GND = Logic “0”

Twos

B2

29

GND = Logic “0”

Fours

B3

30

GND = Logic “0”

Eights (Most Significant)

OSC

36

Floating or with

Oscillator input. Disables BP output devices, allowing segments to be

external capacitor GND

synchronized to an external signal input at the BP terminal (pin 5)

DS1

31

DS2, DS1 = 00 Selects D4

DS2, DS1 = 01 Selects D3

DS2

32

GND = Logical Zero

DS2, DS1 = 10 Selects D2

DS2, DS1 = 11 Selects D1

CS1

33

When both CS1 and CS2 are LOW, the data and digit select input

latches are open or enabled.

CS2

34

GND = Active

On the rising of CS1 or CS2, data is latched, decoded and stored in

the output drive latches.

BUS COMPATIBLE, 4-DIGIT

CMOS DECODER/DRIVER

TC7211AM

Digit Select Inputs

DIGIT ASSIGNMENT

OUTPUT DEFINITIONS

Output pins are defined by the alphabetical segment assignment and numerical digital assignment.

Output

Pin No.

Function

Output

Pin No.

Function

A1

37

A

Segment Drive

Digit 1

(LSD)

A3

13

A

Segment Drive

Digit 3

B1

38

B

B3

14

B

C1

39

C

C3

15

C

D1

40

D

D3

16

D

E1

2

E

E3

17

E

F1

4

F

F3

19

F

G1

3

G

G3

18

G

A2

6

A

Segment Drive

Digit 2

A4

20

A

Segment Drive

Digit 4

(MSD)

B2

7

B

B4

21

B

C2

8

C

C4

22

C

D2

9

D

D4

23

D

E2

10

E

E4

24

E

F2

12

F

F4

26

F

G2

11

G

G4

25

G

Data Input Bits

G

A

B

C

F

E

D

D4

D3

D2

D1