February 1988
CD4511BM/CD4511BC BCD-to-7 Segment
Latch/Decoder/Driver
General Description
Features
Y
Low logic circuit power dissipation
The CD4511BM/CD4511BC BCD-to-seven segment latch/
decoder/driver 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.
Y
High current sourcing outputs (up to 25 mA)
Latch storage of code
Y
Y
Y
Y
Y
Y
Y
Blanking input
Lamp test provision
Readout blanking on all illegal input combinations
Lamp intensity modulation capability
Time share (multiplexing) facility
Equivalent to Motorola MC14511
Applications include instrument (e.g., counter, DVM, etc.)
display driver, computer/calculator display driver, cockpit
display driver, and various clock, watch, and timer uses.
Connection Diagram
Truth Table
Inputs
Outputs
Dual-In-Line Package
LE BI LT
D
C
B
A
a
b
c
d
e
f
g
Display
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
X
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
X
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
X
X
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
X
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
X
X
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X
1
0
1
0
1
1
0
1
0
1
1
1
0
0
0
0
0
0
1
0
1
1
1
1
1
0
0
1
1
1
0
0
0
0
0
0
1
0
1
1
0
1
1
1
1
1
1
1
0
0
0
0
0
0
1
0
1
0
1
1
0
1
1
0
1
0
0
0
0
0
0
0
*
1
0
1
0
1
0
0
0
1
0
1
0
0
0
0
0
0
0
1
0
1
0
0
0
1
1
1
0
1
1
0
0
0
0
0
0
1
0
0
0
1
1
1
1
1
0
1
1
0
0
0
0
0
0
B
0
1
2
3
4
5
6
7
8
9
TL/F/5991–1
Top View
*
Order Number CD4511B
e
X
Don’t Care
*Depends upon the BCD code applied during the 0 to 1 transition of LE.
Segment Identification
Display
TL/F/5991–3
TL/F/5991–2
C
1995 National Semiconductor Corporation
TL/F/5991
RRD-B30M105/Printed in U. S. A.