Description

The SN74LS125N is a Quadruple Bus Buffer with 3-State Outputs, manufactured by Texas Instruments and housed in a standard 14-pin DIP through-hole package. This device contains four independent non-inverting buffer gates, each with an individual active-LOW enable input controlling its 3-state output.

When enabled, the outputs exhibit the low-impedance characteristics of a standard TTL/LS output, with additional drive capability that allows the buffers to drive bus lines directly, without needing external pull-up resistors. When disabled, each output goes into a high-impedance ("3-state") condition, effectively disconnecting it from the bus — a key feature for designs where multiple devices need to share a common data or address bus without conflict.

This makes the SN74LS125N a common choice for bus interfacing, tri-state data bus control, memory and I/O bus isolation, and any digital system where signal lines must be selectively enabled or floated.

Key Specifications

• Function: Quad non-inverting buffer with 3-state outputs (negative/active-LOW enable)
• Logic Family: TTL, Low Power Schottky (LS)
• Package: 14-pin PDIP (through-hole)
• Output Type: 3-state, high drive capability for bus lines
• Manufacturer: Texas Instruments

Common Applications

• Tri-state bus buffering and isolation in microprocessor systems
• Memory and I/O bus interfacing
• Signal line enabling/disabling in shared bus architectures
• General digital logic buffering in TTL-based designs

Package Includes

• 1 x SN74LS125N IC (14-pin DIP)