74LS251 8 To 1 Data Selector/Multiplexer With 3-State Output | Datasheet

74LS251 is a high speed 8-Input Digital Multiplexer. These ICs contain full on-chip binary decoding to select one of eight data sources and feature a strobe-controlled three-state output. The strobe must be at a low logic level to enable these devices. The three-state outputs permit a number of outputs to be connected to a common bus. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers. The IC also constitutes a wide array of features such as thermal overload protection & ESD protection. The IC 74LS251 is smaller in size and it has a much faster speed which makes it reliable in every kind of device.

What is a Data Selector/Multiplexer?

A multiplexer/data selector is a digital combinational logic circuit that toggles one of several input lines to a single common output line. The select lines determine which input is connected to the output, and also to increase the amount of data that can be sent over a network within a certain time. It is also called a data selector.

74LS251 Pinout

74LS251 Pin Configuration

Pin No	Pin Name	Description
1	I3	Multiplexer Input I3
2	I2	Multiplexer Input I2
3	I1	Multiplexer Input I1
4	I0	Multiplexer Input I0
5	Z	Multiplexer Output Z
6	Z’	Complementary Multiplexer Output Z’
7	E0′	Active Low Output Enable Input
8	GND	Ground Pin
9	S2	Data Select Input S2
10	S1	Data Select Input S1
11	S0	Data Select Input S0
12	I7	Multiplexer Input I7
13	I6	Multiplexer Input I6
14	I5	Multiplexer Input I5
15	I4	Multiplexer Input I4
16	Vcc	Chip Supply Voltage

74LS251 Features & Specifications

• Technology Family: LS
• Function: Encoder, Multiplexer
• Configuration: 8:1
• Channels (#): 1
• VCC (Min) (V): 4.75
• VCC (Max) (V): 5.25
• Input type: TTL
• Output type: TTL
• Tri-State Version of the 74LS151
• Interface Directly with the System Bus
• Perform Parallel to Serial Conversion
• Complementary Outputs Provide True and Inverted Data
• Standard TTL Switching Voltages

Applications

• The 74LS251 IC can be used as a universal function generator to generate any logic function of fosur variables.
• Sometimes also used to encode the output of a flash analog to digital converter.

You can download this Datasheet for 74LS251 8 To 1 Data Selector/Multiplexer from the link given below:

See Also: 74LS93 4-Bit Binary/Decade Counter IC – Datasheet | 74LS14 Schmitt Trigger Hex Inverter IC – Datasheet | 74LS04 Hex Inverter IC / NOT Gate IC – Datasheet