74LS47 BCD to 7-Segment Display Decoder IC – Datasheet

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).

What is a BCD to 7-Segment Display Decoder?

A BCD to Seven Segment decoder is a combinational logic circuit that accepts a decimal digit in BCD (input) and generates appropriate outputs for the segments to display the input decimal digit.

74LS47 Pinout

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.

You can download this Datasheet for 74LS47 BCD to 7-Segment Display Decoder from the link given below:

See Also: 7407 Hex Buffer IC | 74LS20 Dual 4 – Input NAND IC | 74LS00 Quad Two Input NAND Gate