Philips hef4543b DATASHEETS
INTEGRATED CIRCUITS
DATA SH EET
For a complete data sheet, please also download:
•The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC
•The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC
HEF4543B
MSI
BCD to 7-segment
latch/decoder/driver
Product specification
File under Integrated Circuits, IC04
January 1995
Philips Semiconductors Product specification
BCD to 7-segment latch/decoder/driver
DESCRIPTION
The HEF4543B is a BCD to 7-segment
latch/decoder/driver for liquid crystal and LED displays. It
has four address inputs (DAto DD), an active HIGH latch
disable input (LD), an active HIGH blanking input (BI), an
active HIGH phase input (PH) and seven buffered
segment outputs (Oato Og).
HEF4543B
MSI
The circuit provides the function of a 4-bit storage latch
and an 8-4-2-1 BCD to 7-segment decoder/driver. It can
invert the logic levels of the output combination. The phase
(PH), blanking (BI) and latch disable (LD) inputs are used
to reverse the function table phase, blank the display and
store a BCD code, respectively.
For liquid crystal displays a square-wave is applied to PH
and the electrical common back-plane of the display. The
outputs of the device are directly connected to the
segments of the liquid crystal.
Fig.1 Functional diagram.
PINNING
D
to D
A
D
PH phase input (active HIGH)
BI blanking input (active HIGH)
LD latch disable input (active HIGH)
O
to O
a
g
address (data) inputs
segment outputs
Fig.2 Pinning diagram.
HEF4543BP(N): 16-lead DIL; plastic (SOT38-1)
HEF4543BD(F): 16-lead DIL; ceramic (cerdip) ( SOT74)
HEF4543BT(D): 16-lead SO; plastic (SOT109-1)
( ): Package Designator North America
Fig.3 Segment designation.
January 1995 2
FAMILY DATA, I
See Family Specifications
LIMITS category MSI
DD
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January 1995 3
Philips Semiconductors Product specification
BCD to 7-segment latch/decoder/driver
Fig.4 Logic diagram.
HEF4543B
MSI
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