74LS49 BCD to 7-Segment Decoder with Open Collector Outputs

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The 74LS49 IC features active-high outputs for driving lamp buffer. This circuit incorporates a direct blanking input, segment identification & resultant displays. It also contains an overriding blanking input, which can be used to control the lamp intensity by pulsing or to inhibit the output. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers. The IC 74LS49 is smaller in size and it has a much faster speed which makes it reliable in every kind of device.

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What is a BCD to 7-Segment 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.

74LS49 Key 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

74LS49 Pinout

Pin No.	Pin Name	Description
1	B	BCD input of the IC
2	C	BCD input of the IC
3	BI	Blanking input
4	D	BCD input of the IC
5	A	BCD input of the IC
6	e	7 segment output 1
7	GND	Ground
8	d	7 segment output 2
9	c	7 segment output 3
10	b	7 segment output 4
11	a	7 segment output 5
12	g	7 segment output 6
13	f	7 segment output 7
14	Vcc	Chip Supply Voltage

Applications

The 74LS48 IC has a number applications, a few are listed below:

It is usually used in devices such as displays for calculators, digital watches & displays, etc.
They are also used in digital clocks, electronic meters, and other electronic devices that display numerical information.