SN74S251N3

Overview

The SN74S251N3 is an 8-line to 1-line multiplexer from the Texas Instruments SN74S series, housed in a 16-pin PDIP package. It features complementary outputs and three-state logic capabilities for bus-oriented systems. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports data rates up to 200 MHz. Key electrical parameters include a propagation delay of 16 ns and a maximum power dissipation of 500 mW. It functions reliably across an operating temperature range of 0°C to 70°C.

Feature Summary

• Provides high-speed 8-to-1 data selection with complementary true and inverted outputs.
• Integrates three-state outputs to facilitate direct connection to system buses without external buffers.
• Utilizes Schottky transistor technology to achieve fast switching speeds and reduced propagation delays.

Applications

• High-speed data routing in digital communication systems
• Address decoding and memory selection in microprocessor-based designs
• Waveform generation and signal path switching

Procurement Notes

Verify the specific suffix 'N3' against the manufacturer's current datasheet to confirm pinout compatibility and RoHS status. Ensure the procurement source provides official documentation, as distributor listings may contain conflicting specifications or outdated revision information for legacy components.

Selection Notes

Select this component when designing systems requiring fast data multiplexing with bus-compatible outputs. Compare propagation delay and power consumption against other logic families if low-power operation is critical. Confirm that the 16-pin DIP package fits the target PCB layout constraints before finalizing the design.

Part Context

This part belongs to the SN74S family, known for speed-performance improvements over standard TTL. It serves as a functional equivalent to the SN74LS251 but offers significantly faster switching characteristics. The device is designed for applications where high-speed data handling is required alongside standard logic interface compatibility.

Replacement Considerations

The SN74S251N is a compatible alternative offering identical functionality and pinout. For lower power consumption requirements, consider the SN74LS251N, though it exhibits slower switching speeds. Verify that any substitute maintains the three-state output capability required for the specific bus architecture.