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HEF4511BD

BCD to 7-segment latch/decoder/driver

Philips Electronics 

Philips Semiconductors

BCD to 7-segment latch/decoder/driver

Product specification

HEF4511B

MSI

DESCRIPTION

The HEF4511B is a BCD to 7-segment

latch/decoder/driver with four address inputs (DA to DD),

an active LOW latch enable input (EL), an active LOW

ripple blanking input (BI), an active LOW lamp test input

(LT), and seven active HIGH n-p-n bipolar transistor

segment outputs (Oa to Og).

When EL is LOW, the state of the segment outputs (Oa to

Og) is determined by the data on DA to DD.

When EL goes HIGH, the last data present on DA to

DD are stored in the latches and the segment outputs

remain stable. When LT is LOW, all the segment outputs

are HIGH independent of all other input conditions. With

LT HIGH, a LOW on BI forces all segment outputs LOW.

The inputs LT and BI do not affect the latch circuit.

Fig.1 Functional diagram.

Fig.2 Pinning diagram.

HEF4511BP(N): 16-lead DIL; plastic (SOT38-1)

HEF4511BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)

HEF4511BT(D): 16-lead SO; plastic (SOT109-1)

( ): Package Designator North America

PINNING

DA to DD

EL

BI

LT

Oa to Og

address (data) inputs

latch enable input (active LOW)

ripple blanking input (active LOW)

lamp test input (active LOW)

segment outputs

Fig.4 Segment

designation.

Fig.3 Schematic diagram of output stage.

January 1995

FAMILY DATA, IDD LIMITS category MSI

See Family Specifications

2

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