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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
High Current BCD-to-Seven
Segment Decoder/Driver
The MC14547 BCD–to–seven segment decoder/driver is constructed with
complementary MOS (CMOS) enhancement mode devices and NPN bipolar
output drivers in a single monolithic structure. The circuit provides the
functions of an 8421 BCD–to–seven segment decoder with high output drive
capability. Blanking (BI), can be used to turn off or pulse modulate the
brightness of the display. The MC14547 can drive seven–segment
light–emitting diodes (LED), incandescent, fluorescent or gas discharge
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.
High Current Sourcing Outputs (Up to 65 mA)
Low Logic Circuit Power Dissipation
Supply Voltage Range = + 3.0 V to + 18 V
Blanking Input
Readout Blanking on All Illegal Combinations
Lamp Intensity Modulation Capability
Multiplexing Capability
Capable of Driving Two Low–Power TTL Loads, One Low–Power
Schottky TTL Load or Two HTL Loads over the Rated Temperature
Range
Use MC14511B for Applications Requiring Data Latches
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 , Pin 8)
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
Operating Temperature Range
Storage Temperature Range
Maximum Continuous Output Drive
Current (Source) per Output
Maximum Continuous Power Dissipation
* Maximum Ratings are those values beyond which damage to the device may occur.
* See Power Derating Curve Figure 1.
This device contains circuitry to protect the inputs against damage
due to high static voltages or electric fields; however, it is advised that
normal precautions be taken to avoid application of any voltage higher
than maximum rated voltages to this high-impedance circuit. A destruc-
tive high current mode may occur if V in and V out is not constrained to
the range V SS
(V in or V out )
Due to the sourcing capability of this circuit, damage can occur to the
device if V DD is applied, and the outputs are shorted to V SS and are at a
logical 1 (See Maximum Ratings).
Unused inputs must always be tied to an appropriate logic voltage
level (e.g., either V SS or V DD ).
MOTOROLA CMOS LOGIC DATA
Symbol
Value
V DD
– 0.5 to + 18
V in
– 0.5 to V DD + 0.5
T A
– 55 to + 125
T stg
– 65 to + 150
I OHmax
65
P D
1200*
V DD .
MC14547B
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBDW
T A = – 55 to 125 C for all packages.
B
1
C
2
NC
3
BI
4
NC
5
Unit
D
6
V
A
7
V
V SS
8
_ C
_ C
mA
0
1
2
3
mW
TRUTH TABLE
Inputs
BI
D C B A a b c d e f g
0
X X X X 0 0 0 0 0 0 0
1
0 0 0 0 1 1 1 1 1 1 0
1
0 0 0 1 0 1 1 0 0 0 0
1
0 0 1 0 1 1 0 1 1 0 1
1
0 0 1 1 1 1 1 1 0 0 1
1
0 1 0 0 0 1 1 0 0 1 1
1
0 1 0 1 1 0 1 1 0 1 1
1
0 1 1 0 0 0 1 1 1 1 1
1
0 1 1 1 1 1 1 0 0 0 0
1
1 0 0 0 1 1 1 1 1 1 1
1
1 0 0 1 1 1 1 0 0 1 1
1
1 0 1 0 0 0 0 0 0 0 0
1
1 0 1 1 0 0 0 0 0 0 0
1
1 1 0 0 0 0 0 0 0 0 0
1
1 1 0 1 0 0 0 0 0 0 0
1
1 1 1 0 0 0 0 0 0 0 0
1
1 1 1 1 0 0 0 0 0 0 0
X = Don't care
L SUFFIX
CERAMIC
CASE 620
P SUFFIX
PLASTIC
CASE 648
DW SUFFIX
SOIC
CASE 751G
Plastic
Ceramic
SOIC
16
V DD
15
f
14
g
a
13
a
f
g
b
12
b
e
c
d
11
c
10
d
9
e
DISPLAY
4
5
6
7
8
9
Outputs
Display
Blank
0
1
2
3
4
5
6
7
8
9
Blank
Blank
Blank
Blank
Blank
Blank
MC14547B
6–393
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