SN74HC251N

Overview

The SN74HC251N is a data selector/multiplexer containing full binary decoding to select one of eight data sources. It features strobe-controlled complementary three-state outputs that interface directly with system buses or drive up to fifteen LSTTL loads. The device operates within a wide voltage range of 2 V to 6 V and consumes low power, with a maximum ICC of 80 μA. Typical propagation delay is 9 ns at 5 V. It performs parallel-to-serial conversion and provides both true and inverted data outputs.

Feature Summary

• Features full binary decoding for selecting one of eight data sources
• Provides strobe-controlled complementary three-state outputs
• Capable of interfacing directly with system buses or driving multiple LSTTL loads
• Performs parallel-to-serial conversion with true and inverted data outputs

Applications

• Bus-oriented systems requiring data selection
• Parallel-to-serial data conversion circuits
• Multiplexing applications in digital logic designs

Procurement Notes

Verify the specific package type and manufacturer against the datasheet before procurement. Confirm RoHS compliance status and lead finish details via the orderable addendum. Ensure the component meets the required operating temperature range for your application environment. Check for any documentation updates or revision history changes that may affect pinout or electrical characteristics.

Selection Notes

Select this component when a single-channel output from multiple inputs is required with bus-compatible three-state control. Consider the HC logic family for its wide voltage operation and low power consumption compared to older technologies. Evaluate the PDIP-16 package suitability for through-hole mounting requirements. Verify input transition rise/fall time constraints against your signal source capabilities.

Part Context

This device belongs to the Texas Instruments SNx4HC251 series of data selectors and multiplexers. It serves as the three-state version of the standard 'HC151 device. The series includes various package options such as SOIC, SSOP, and TSSOP, with the SN74HC251N specifically designated for the PDIP-16 through-hole configuration.

Replacement Considerations

SN74HC151 can be used if three-state outputs are not required. SN54HC251 offers extended military-grade temperature ranges (-55°C to 125°C) compared to the commercial grade (-40°C to 85°C). Other manufacturers' HC251 equivalents may require verification of pin compatibility and electrical specifications.