IC74LS47

The 74LS47 IC features active low outputs designed for driving common – anode LEDs or incandescent indicators directly. It accepts a binary coded decimal as input and converts it into a pattern to drive a seven-segment for displaying digits 0 to 9. Binary coded decimal (BCD) is an encoding in which each digit of a number is represented by its own binary sequence (usually of four bits).

74LS47 Pin Configuration:

Pin No Pin Name Description
1 B BCD input of the IC
2 C BCD input of the IC
3 Display test/Lamp test To test the display LED
4 Blank Input To turn-off the LEDs of the display
5 Store Store or strobe a BCD code
6 D BCD input of the IC
7 A BCD input of the IC
8 GND Ground Pin
9 e 7 segment output 1
10 d 7 segment output 2
11 c 7 segment output 3
12 b 7 segment output 4
13 a 7 segment output 5
14 g 7 segment output 6
15 f 7 segment output 7
16 VCC Supply Voltage

74LS47 Features & Specifications:

Function: Decoder, Demultiplexer
Technology Family: LS
VCC (Min): 4.75V
VCC (Max): 5.25V
Channels: 1
Voltage (Nom): 5V
Max Frequency at normal Voltage: 35Mhz
tpd at normal Voltage (Max): 100 nsec
Configuration: 4:7
Type: Open-Collector
IOL (Max): 3.2mA
IOH (Max): -0.05mA
Rating: Catalog
Operating temperature range (C): 0 to 70
Bits (#): 7
Digital input leakage (Max): 5uA
ESD CDM (kV): 0.75
ESD HBM (kV): 2

Applications:

It is usually used in devices such as a display for calculators, digital watches & displays, etc.