74LS125 Quadruple 3-State Bus Buffer IC

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The 74LS125 IC package features four independent 3-State Bus Buffers. It is the part of 74XXYY IC series. The 74LS125 IC has a wide range of working voltage, a wide range of working conditions, and directly interfaces with CMOS, NMOS, and TTL. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers. The IC 74LS125 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 Buffer?

A buffer is a basic logic gate that passes its input, unchanged, to its output. Its behavior is the opposite of a NOT gate. The main purpose of a buffer is to regenerate the input, usually using a strong high and a strong low. A buffer has one input and one output; its output is always equal to its input. Buffers are also used to increase the propagation delay of circuits by driving the large capacitive loads.

74LS125 Key Features & Specifications

Technology Family: LS
VCC (Min): 4.75V
VCC (Max): 5.25
Channels (#): 4
Operating Voltage (Nom): 5V
Frequency at normal voltage (Max): 35MHz
Propagation delay (Max): 20ns
IOL (Max): 24mA
IOH (Max):-2.6mA
Input Type: Bi-polar
Output type: 3-State
High speed (tpd 10-50ns)
Rating: Catalog
Data rate: 70Mbps
Available in 14-pin PDIP, GDIP, PDSO packages

74LS125 Pinout

Pin No.	Pin Name	Description
1	E’	Active Low Input 1
2	D	Active High Input 1
3	O	Output pin 1
4	E’	Active Low Input 2
5	D	Active High Input 2
6	O	Output pin 2
7	GND	Ground pin
8	O	Output pin 3
9	D	Active High Input 3
10	E’	Active Low Input 3
11	O	Output pin 4
12	D	Active High Input 4
13	E’	Active Low Input 4
14	Vcc	Chip Supply Voltage