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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
BCD-to-Seven Segment
Decoder
The MC14558B decodes 4–bit binary coded decimal data dependent on
the state of auxiliary inputs, Enable and RBI, and provides an active–high
seven–segment output for a display driver.
An auxiliary input truth table is shown, in addition to the BCD to
seven–segment truth table, to indicate the functions available with the two
auxiliary inputs.
Leading Zero blanking is easily obtained with an external flip–flop in time
division multiplexed systems displaying most significant decade first.
Supply Voltage Range = 3.0 Vdc to 18 Vdc
Segment Blanking for All Illegal Input Combinations
Lamp Test Function
Capability for Suppression of Non–Significant Zeros
Lamp Intensity Function
Capable of Driving Two Low–power TTL Loads. One Low–power
Schottky TTL Load or Two HTL Loads Over the Rated Temperature
Range
Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î
MAXIMUM RATINGS*
(Voltages referenced to V SS )
Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î
Rating
DC Supply Voltage
Input Voltage, All Inputs
DC Input Voltage, per Pin
Operating Temperature Range
Power Dissipation, per Package†
Storage Temperature Range
* Maximum Ratings are those values beyond which damage to the device may occur.
†Temperature Derating:
Plastic "P and D/DW" Packages: – 7.0 mW/ _ C From 65 _ C To 125 _ C
Ceramic "L" Packages: – 12 mW/ _ C From 100 _ C To 125 _ C
AUXILIARY INPUT TRUTH TABLE
Enable
RBI
Pin 3
Pin 5
0
0
0
1
1
1
1
0
1
X
X = Don't Care
RBI = Ripple Blanking Input
RBO = Ripple Blanking Output
MOTOROLA CMOS LOGIC DATA
Symbol
Value
V DD
– 0.5 to + 18
V in
– 0.5 to V DD + 0.5
I in
T A
– 55 to + 125
P D
500
T stg
– 65 to + 150
BCD
RBO
Input
Code
Pin 4
Function Performed
X
0
Lamp Test
X
1
Blank Segments
0
1
Display Zero
0
0
Blank Segments
1 – 9
1
1–9 Displayed
Unit
V
V
ENABLE
10
mAdc
_ C
mW
_ C
0
MC14558B
L SUFFIX
CERAMIC
CASE 620
P SUFFIX
PLASTIC
CASE 648
D SUFFIX
SOIC
CASE 751B
ORDERING INFORMATION
MC14XXXBCP
Plastic
MC14XXXBCL
Ceramic
MC14XXXBD
SOIC
T A = – 55 to 125 C for all packages.
PIN ASSIGNMENT
B
1
16
V DD
C
2
15
f
3
14
g
f
RBO
4
13
a
e
RBI
5
12
b
D
6
11
c
A
7
10
d
V SS
8
9
e
DISPLAY
1
2
3
4
5
6
7
MC14558B
a
g
b
c
d
8
9
6–429
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