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| ICM7217_01 Datasheet, PDF (10/20 Pages) Intersil Corporation – 4-Digit LED Display, Programmable Up/Down Counter | |||
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ICM7217
INPUT
CD4069 1N4148
OUTPUT
INPUT
CD4069 1N4148
OUTPUT
INPUT
INPUT B
High
High
Low
Low
OUTPUT
INPUT A
OUTPUT
High
Low
Low
Disconnected
High
Disconnected
Low
Disconnected
INPUT
INPUT B
High
High
Low
Low
OUTPUT
INPUT A
OUTPUT
High
Disconnected
Low
Disconnected
High
High
Low
Low
FIGURE 11C. CMOS OPEN DRAIN
FIGURE 11D. CMOS THREE-STATE BUFFER
FIGURE 11. DRIVING 3-LEVEL INPUTS OF ICM7217
DN DIGIT LINE
50kâ¦
DISPLAY
CONTROL
VDD
ICM7217
ICM7217B
DN DIGIT LINE
50kâ¦
50kâ¦
VDD
DISPLAY
CONTROL
ICM7217A
ICM7217C
FIGURE 12A. COMMON ANODE
FIGURE 12B. COMMON CATHODE
FIGURE 12. FORCING LEADING ZERO DISPLAY
VDD
VDD
DIGIT
DRIVE
ICM7217
ICM7217B
SEGMENT
DRIVE
VSS
VDD
2N2219
OR SIMILAR
2N6034
OR SIMILAR
SEGMENT
DRIVE
ICM7217
ICM7217C
DIGIT
DRIVE
VSS
VDD
2N2219
OR SIMILAR
2N6034
OR SIMILAR
VSS
VSS
FIGURE 13A. COMMON ANODE DISPLAY
FIGURE 13B. COMMON CATHODE DISPLAY
FIGURE 13. DRIVING HIGH CURRENT DISPLAYS
10
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