5

specified under Operating Characteristics. For lowest power consumption, input signals should swing over the full supply.

INPUT

DIP TERMINAL

CONDITIONS

FUNCTION

B0

27

Ones (Least Significant)

Data Input Bits

B1

28

Twos

B2

29

Fours

B3

30

Eights (Most Significant)

OSC

36

Floating or with External

Oscillator Input

Disables BP output devices, allowing segments to be synchronized to

an external signal input at the BP terminal (Pin 5).

Multiplexed-Binary Input Configuration

INPUT

TERMINAL

CONDITIONS

FUNCTION

D1

31

D1 Digit Select (Least Significant)

D2

32

D2 Digit Select

D3

33

D3 Digit Select

D4

34

D4 Digit Select (Most Significant)

Microprocessor Interface Input Configuration

INPUT

DESCRIPTION

DIP TERMINAL

CONDITIONS

FUNCTION

DA1

Digit Address

Bit 1 (LSB)

31

DA1 and DA2 serve as a 2-bit Digit Address Input

DA2, DA1 = 00 selects D4

DA2, DA1 = 01 selects D3

DA2, DA1 = 10 selects D2

DA2, DA1 = 11 selects D1

DA2

Digit Address

Bit 2 (MSB)

32

CS1

Chip Select 1

33

When both CS1 and CS2 are taken low, the data at the Data

and Digit Select code inputs are written into the input latches.

On therisingedgeof either ChipSelect, the data is decoded

and written into the output latches.

CS2

Chip Select 2

34

Timing Diagrams

FIGURE 1. MULTIPLEXED INPUT

FIGURE 2. MICROPROCESSOR INTERFACE INPUT

DIGIT SELECT

DIGIT SELECT

DATA VALID

DATA VALID

CS1

(CS2)

CS2

(CS1)

DATA AND

DIGIT

ADDRESS

= DON’T CARE

ICM7211A