HEF4511BDF datasheet(2/11 Pages) PHILIPS

2 / 11 page

January 1995

Philips Semiconductors

Product speciﬁcation

BCD to 7-segment latch/decoder/driver

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.

PINNING

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

DA to DD

address (data) inputs

latch enable input (active LOW)

ripple blanking input (active LOW)

lamp test input (active LOW)

Oa to Og

segment outputs

Fig.2 Pinning diagram.

Fig.3 Schematic diagram of output stage.

FAMILY DATA, IDD LIMITS category MSI

See Family Specifications

Fig.4

Segment

designation.

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