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HEF4543BN

BCD to 7-segment latch/decoder/driver

Philips Electronics 

Philips Semiconductors

BCD to 7-segment latch/decoder/driver

Product specification

HEF4543B

MSI

DESCRIPTION

The HEF4543B is a BCD to 7-segment

latch/decoder/driver for liquid crystal and LED displays. It

has four address inputs (DA to 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 (Oa to Og).

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.2 Pinning diagram.

Fig.1 Functional diagram.

PINNING

DA to DD

PH

BI

LD

Oa to Og

address (data) inputs

phase input (active HIGH)

blanking input (active HIGH)

latch disable input (active HIGH)

segment outputs

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.

FAMILY DATA, IDD LIMITS category MSI

See Family Specifications

January 1995

2

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