MM54HC4511 MM74HC4511 BCD-to-7 Segment Latch Decoder Driver
January 1988
MM54HC4511 MM74HC4511
BCD-to-7 Segment Latch Decoder Driver
General Description
This high speed latch decoder driver utilizes advanced sili-
con-gate CMOS technology It has the high noise immunity
and low power consumption of standard CMOS integrated
circuits as well as the ability to drive 10 LS-TTL loads The
circuit provides the functions of a 4-bit storage latch an
8421 BCD-to-seven segment decoder and an output drive
capability Lamp test (LT) blanking (Bl) 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
emitting diodes (LED) incandescent fluorescent gas dis-
charge or liquid crystal readouts either directly or indirectly
Applications include instrument (e g counter DVM etc )
display driver computer calculator display driver cockpit
display driver and various clock watch and timer uses
The 54HC 74HC logic family is speed function and pinout
compatible with the standard 54LS 74LS logic family All
inputs are protected from damage due to static discharge by
internal diode clamps to V
CC
and ground
Features
Y
Y
Y
Y
Y
Y
Y
Latch storage of input data
Blanking input
Lamp test input
Low power consumption characteristics of CMOS
devices
Wide operating voltage range 2 to 6 volts
Low input current 1
mA
maximum
Low quiescent current 80
mA
maximum over full tem-
perature range (74 Series)
Connection Diagram
Dual-In-Line Package
Truth Table
INPUTS
OUTPUTS
LE BI LT D C B A a b c d e f g DISPLAY
x
x
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
x
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
x
x
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
x
x
x
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
x
x
x
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
x
x
x
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
x
H
L
H
L
H
H
L
H
L
H
H
H
L
L
L
L
L
L
H
L
H
H
H
H
H
L
L
H
H
H
L
L
L
L
L
L
H
L
H
H
L
H
H
H
H
H
H
H
L
L
L
L
L
L
H
L
H
L
H
H
L
H
H
L
H
L
L
L
L
L
L
L
H
L
H
L
H
L
L
L
H
L
H
L
L
L
L
L
L
L
H
L
H
L
L
L
H
H
H
L
H
H
L
L
L
L
L
L
H
L
L
L
H
H
H
H
H
L
H
H
L
L
L
L
L
L
8
0
1
2
3
4
5
6
7
8
9
TL F 5373 鈥?1
Order Number MM54HC4511 or MM74HC4511
x
e
Don鈥檛 care
e
Depends upon the BCD code applied during the 0 to 1 transition of LE
C
1995 National Semiconductor Corporation
TL F 5373
RRD-B30M105 Printed in U S A
1
2
3
4
5
6
