74LS48 BCD to 7-segment Decoder/Driver


The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS48 BCD to 7-segment Decoder/Driver has full ripple-blanking input/output controls and a lamp test input. patterns for BCD input counts above 9 are unique symbols to authenticate input conditions.

74LS48 Features

  • Accepts Four Line of BCD Input and Converts this to Seven Open Collector Outputs
  • Pull-Up Resistors Included
  • Lamp Test Input
  • Operating Temperature up to 70°C
  • Standard TTL Switching Voltages

74LS48 Specifications

Supply Voltage4.75 – 5.25Vdc
Maximum Clock Frequency40Mhz
Power Dissipation2mW/gate @100kHz
Minimum Output Current8mA
Propagation Delay10nS
Fan Out (TTL Loads)20

74LS48 Pinout Diagram

74LS48 Pin Description

Pin NoPin NameDescription
1BBCD Inputs B
2CBCD Inputs C
3LTLamp Test Input (Active LOW)
4RB0Blanking Input (Active LOW)
5RB1Ripple Blanking Input (Active LOW)
6DBCD Inputs D
7ABCD Inputs A
9eSegment Outputs (Active LOW)
10dSegment Outputs (Active LOW)
11cSegment Outputs (Active LOW)
12bSegment Outputs (Active LOW)
13aSegment Outputs (Active LOW)
14gSegment Outputs (Active LOW)
15fSegment Outputs (Active LOW)
16VccPower Supply

74LS48 Circuit


  • It is used in code conversions
  • It may also be used for data distribution i.e. demultiplexing.

74LS48 Alternative Equivalent


Download 74LS48 BCD to 7-segment Decoder/Driver Datasheet from the link given below.