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ICM7228BIPI Datasheet(PDF) 7 Page - Intersil Corporation

Part # ICM7228BIPI
Description  8-Digit, Microprocessor- Compatible, LED Display Decoder Driver
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ICM7228BIPI Datasheet(HTML) 7 Page - Intersil Corporation

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Timing Diagrams
FIGURE 1. ICM7228A/B WRITE CYCLE
FIGURE 2. ICM7228A/B SEQUENTIAL 8-DIGIT RAM UPDATE
FIGURE 3. ICM7228C/D WRITE CYCLE
FIGURE 4. DISPLAY DIGITS MULTIPLEX (COMMON ANODE DISPLAY)
tMS
tWL
tDS
tMH
MODE
INPUT
VALID
DATA
tDH
tWH
WRITE
DECODE/NO DECODE? ID5
(D8)
(D1)
MODE
CONTROL WORD
TYPE OF DECODER?ID6
DECODE/NO DECODE? ID5
SHUTDOWN?ID4
DATA COMING ID7
CONTROL WORD
TYPE OF DECODER?ID6
SHUTDOWN? ID4
DATA COMING ID7
DON’T CARE
WRITE DATA
8 PULSES
WRITE
VALID DATA
VALID
tWL
tWH
tAS
tAH
tDH
tDS
DATA
WRITE
DIGIT
ADDRESS
DAO-DAZ
INTERDIGIT BLANKING
INTERNAL SIGNAL
TYPICAL DIGITS
OUTPUT PULSES
10
µs (TYP)
FREE RUNNING
320
µs (TYP)
FREE RUNNING (PER DIGIT)
INTERDIGIT BLANKING
D2
D5
D1
D7
D8
D6
D4
D3
Typical Performance Curves
FIGURE 5. COMMON ANODE DIGIT DRIVER IDIG vs (VDD - VDIG)
FIGURE 6. COMMON ANODE SEGMENT DRIVER ISEG vs VSEG
VDD-VDIG (V)
0
100
200
300
400
500
0
1.0
2.0
3.0
4.0
5.0
-55oC
25oC
125oC
-55oC
25oC
125oC
VSEG (V)
80
60
40
20
0
0
1.0
2.0
3.0
4.0
5.0
-55oC
25oC
125oC
ICM7228


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