ICM7228B データシートの表示（PDF） - Intersil

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ICM7228B

8-Digit, Microprocessor-Compatible, LED Display Decoder Driver

Intersil 

Timing Diagrams

MODE

WRITE

INPUT

DATA

tMS

tMH

tWL

tWH

tDS

tDH

VALID

FIGURE 1. ICM7228A/B WRITE CYCLE

ICM7228

MODE

WRITE

(D1)

CONTROL WORD

WRITE DATA

8 PULSES

TYPE OF DECODER?ID6

DECODE/NO DECODE? ID5

SHUTDOWN?ID4

DATA COMING ID7

(D8) DON’T CARE

CONTROL WORD

TYPE OF DECODER?ID6

DECODE/NO DECODE? ID5

SHUTDOWN? ID4

DATA COMING ID7

FIGURE 2. ICM7228A/B SEQUENTIAL 8-DIGIT RAM UPDATE

DIGIT

ADDRESS

DAO-DAZ

tAS

WRITE

DATA

VALID

tWL

tDS

VALID DATA

tAH

tWH

tDH

FIGURE 3. ICM7228C WRITE CYCLE

INTERDIGIT BLANKING

INTERNAL SIGNAL

D2

D5

D1

D7

TYPICAL DIGITS D8

OUTPUT PULSES D6

D4

D3

10µs (TYP)

FREE RUNNING

320µs (TYP)

FREE RUNNING (PER DIGIT)

INTERDIGIT BLANKING

FIGURE 4. DISPLAY DIGITS MULTIPLEX (COMMON ANODE DISPLAY)

6

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