TLF5991

February 1988

CD4511BMCD4511BC BCD-to-7 Segment

LatchDecoderDriver

General Description

The CD4511BMCD4511BC BCD-to-seven segment latch

decoderdriver is constructed with complementary MOS

(CMOS) enhancement mode devices and NPN bipolar out-

put drivers in a single monolithic structure The circuit pro-

vides the functions of a 4-bit storage latch an 8421 BCD-to-

seven segment decoder and an output drive capability

Lamp test (LT) blanking (BI) and latch enable (LE) inputs

are used to test the display to turn-off or pulse modulate

the brightness of the display and to store a BCD code

respectively It can be used with seven-segment light emit-

ting diodes (LED) incandescent fluorescent gas discharge

or liquid crystal readouts either directly or indirectly

Applications include instrument (eg

counter DVM etc)

display driver computercalculator display driver cockpit

display driver and various clock watch and timer uses

Features

Y

Low logic circuit power dissipation

Y

High current sourcing outputs (up to 25 mA)

Y

Latch storage of code

Y

Blanking input

Y

Lamp test provision

Y

Readout blanking on all illegal input combinations

Y

Lamp intensity modulation capability

Y

Time share (multiplexing) facility

Y

Equivalent to Motorola MC14511

Connection Diagram

Dual-In-Line Package

TLF5991 – 1

Top View

Order Number CD4511B

Segment Identification

TLF5991 – 3

Truth Table

Inputs

Outputs

LE BI LT D C B A a b c d e

f

g Display

X

X

0

X X X X 111 1 1 11

B

X

0

1

X X X X 000 0 0 00

0

1

1

0

0

0

0 111 1 1 10

0

0

1

1

0

0

0

1 011 0 0 00

1

0

1

1

0

0

1

0 110 1 1 01

2

0

1

1

0

0

1

1 111 1 0 01

3

0

1

1

0

1

0

0 011 0 0 11

4

0

1

1

0

1

0

1 101 1 0 11

5

0

1

1

0

1

1

0 001 1 1 11

6

0

1

1

0

1

1

1 111 0 0 00

7

0

1

1

1

0

0

0 111 1 1 11

8

0

1

1

1

0

0

1 111 0 0 11

9

0

1

1

1

0

1

0 000 0 0 00

0

1

1

1

0

1

1 000 0 0 00

0

1

1

1

1

0

0 000 0 0 00

0

1

1

1

1

0

1 000 0 0 00

0

1

1

1

1

1

0 000 0 0 00

0

1

1

1

1

1

1 000 0 0 00

11

1

X X X X

Depends upon the BCD code applied during the 0 to 1 transition of LE

Display

TLF5991 – 2

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A