74HC4543 Datasheet, PDF (4/11 Pages) NXP Semiconductors – BCD to 7-segment latch/decoder/driver for LCDs

Philips Semiconductors
BCD to 7-segment latch/decoder/driver for
LCDs
Product specification
74HC/HCT4543
APPLICATIONS
• Driving LCD displays
• Driving fluorescent displays
• Driving incandescent displays
• Driving gas discharge displays
Fig.4 Functional diagram.
Fig.5 Segment designation.
FUNCTION TABLE
INPUTS
OUTPUTS
DISPLAY
LD BI PH⁽¹⁾ D₃ D₂ D₁ D₀ Q_a Q_b Q_c Q_d Q_e Q_f Q_g
X
H
L
X X X XL
L
L
LL L
L
blank
H
L
L
H
L
L
H
L
L
H
L
L
L
L
L LH H
H
HH H L
0
L
L
L HL
H
H
LL L
L
1
L
L HLH H L
HH L
H2
L
L
H HH H
H
HL L
H3
H
L
L
H
L
L
H
L
L
H
L
L
L
HL LL
H
H
LL
H
H
4
L
H L HH L
H
HL H H 5
L
HHLH L
H
HH H H 6
L
H H HH H
H
LL L
L
7
H
L
L
H
L
L
H
L
L
H
L
L
H
L
L LH
H
H
HH H
H
8
H
L
L HH
H
H
HL
H
H
9
H L HLL
L
L
LL L
L
blank
H L H HL
L
L
LL L
L
blank
H
L
L
H
L
L
H
L
L
H
L
L
H HL LL
L
L
LL L
L
blank
H H L HL
L
L
LL L
L
blank
H HHLL
L
L
LL L
L
blank
H H H HL
L
L
LL L
L
blank
L
L
L
X XXX
(1)
(1)
as
above
H
as above
inverse of above
as
above
Notes
1. For liquid crystal displays, apply a square-wave to PH.
2. Depends upon the BCD-code previously applied when LD = HIGH.
H = HIGH voltage level
L = LOW voltage level
X = don’t care
December 1990
4