MOTOROLA CMOS LOGIC DATA

1

MC14547B

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

Rating

Symbol

Value

Unit

DC Supply Voltage

VDD

– 0.5 to + 18

V

Input Voltage, All Inputs

Vin

– 0.5 to VDD + 0.5

V

Operating Temperature Range

TA

– 55 to + 125

_C

Storage Temperature Range

Tstg

– 65 to + 150

_C

Maximum Continuous Output Drive

Current (Source) per Output

IOHmax

65

mA

Maximum Continuous Power Dissipation

PD

1200*

mW

* 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 Vin and Vout is not constrained to

the range VSS ≤ (Vin or Vout) ≤ VDD.

Due to the sourcing capability of this circuit, damage can occur to the

device if VDD is applied, and the outputs are shorted to VSS and are at a

logical 1 (See Maximum Ratings).

Unused inputs must always be tied to an appropriate logic voltage

level (e.g., either VSS or VDD).

Inputs

Outputs

BI

D C B A a b c d e

f g

Display

0

X

X

X X 0 0 0 0 0 0 0

Blank

1

0

0

0 0 1 1 1 1 1 1 0

0

1

0

0

0 1 0 1 1 0 0 0 0

1

1

0

0

1 0 1 1 0 1 1 0 1

2

1

0

0

1 1 1 1 1 1 0 0 1

3

1

0

1

0 0 0 1 1 0 0 1 1

4

1

0

1

0 1 1 0 1 1 0 1 1

5

1

0

1

1 0 0 0 1 1 1 1 1

6

1

0

1

1 1 1 1 1 0 0 0 0

7

1

1

0

0 0 1 1 1 1 1 1 1

8

1

1

0

0 1 1 1 1 0 0 1 1

9

1

1

0

1 0 0 0 0 0 0 0 0

Blank

1

1

0

1 1 0 0 0 0 0 0 0

Blank

1

1

1

0 0 0 0 0 0 0 0 0

Blank

1

1

1

0 1 0 0 0 0 0 0 0

Blank

1

1

1

1 0 0 0 0 0 0 0 0

Blank

1

1

1

1 1 0 0 0 0 0 0 0

Blank

X = Don’t care

TRUTH TABLE

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

REV 3

1/94

0

1

2

3

4

5

6

7

8

9

DISPLAY

MC14547B

L SUFFIX

CERAMIC

CASE 620

ORDERING INFORMATION

MC14XXXBCP

Plastic

MC14XXXBCL

Ceramic

MC14XXXBDW

SOIC

TA = – 55° to 125°C for all packages.

P SUFFIX

PLASTIC

CASE 648

DW SUFFIX

SOIC

CASE 751G

13

14

15

16

9

10

11

12

5

4

3

2

1

8

7

6

b

a

g

f

VDD

e

d

c

BI

NC

C

B

VSS

A

D

NC

a

b

c

d

e

f

g