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74125

#74125 #tri-state buffer #logic gate #digital IC #TTL #bus driver #control signal #data transmission
74125 Technical Summary

74125 Quad Bus Buffer Gate with 3-State Outputs

Overview

The 74125 is a high-speed, quad bus buffer gate featuring 3-state outputs. This integrated circuit belongs to the 7400 series of TTL logic devices and is designed to provide high-performance buffering for digital systems. Each of the four buffers is controlled by an independent output enable input, allowing for flexible bus interfacing and signal isolation.

This component is particularly useful in bus-oriented systems where multiple devices need to share a common bus without interference. The 3-state outputs provide high impedance when disabled, effectively disconnecting the buffer from the bus. The 74125 is characterized for operation over a wide temperature range and is available in multiple package options.

Features

Applications

The 74125 finds application in various digital systems where bus buffering and signal isolation are required:

Electrical Characteristics

Absolute Maximum Ratings

Parameter Value Unit
Supply Voltage (VCC) 7 V
Input Voltage 5.5 V
Output Voltage (High State) 5.5 V
Operating Free Air Temperature Range 0 to +70 °C
Storage Temperature Range -65 to +150 °C

Recommended Operating Conditions

Parameter Min Typ Max Unit
Supply Voltage (VCC) 4.75 5.0 5.25 V
High-Level Input Voltage 2.0 - - V
Low-Level Input Voltage - - 0.8 V
Operating Ambient Temperature 0 - 70 °C

DC Electrical Characteristics

Parameter Test Conditions Min Typ Max Unit
High-Level Output Voltage VCC = Min, IOH = -400µA 2.4 3.4 - V
Low-Level Output Voltage VCC = Min, IOL = 16mA - 0.2 0.4 V
Input Clamp Voltage VCC = Min, II = -18mA - -1.5 - V
High-Level Input Current VCC = Max, VI = 2.7V - 40 µA
Low-Level Input Current VCC = Max, VI = 0.4V - -1.6 mA

AC Electrical Characteristics

Parameter Test Conditions Min Typ Max Unit
Propagation Delay (A to Y) VCC = 5V, CL = 15pF - 8 15 ns
Output Enable Time (OE to Y) VCC = 5V, CL = 15pF - 12 22 ns
Output Disable Time (OE to Y) VCC = 5V, CL = 15pF - 15 25 ns

Package Information

The 74125 is available in several package options to accommodate different application requirements:

14-Pin Plastic Dual In-Line Package (PDIP)