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Product Detailed Parameters
- Description：SN74LS251 8-LINE TO 1-LINE DATA
- Series：74LS
- Mfr：Texas Instruments
- Package：Bulk
- Type：Multiplexer
- Circuit：1 x 8:1
- Independent Circuits：1
- Current - Output High, Low：2.6mA, 8mA
- Voltage Supply Source：Single Supply
- Voltage - Supply：4.75V ~ 5.25V
- Operating Temperature：0°C ~ 70°C
- Mounting Type：Through Hole
- Package / Case：16-DIP (0.300", 7.62mm)
- Supplier Device Package：16-PDIP
- Grade：-
- Qualification：-
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Overview
The SN74LS251NE4 is a Low Power Schottky (LS) TTL 8-line to 1-line multiplexer manufactured by Texas Instruments. It features complementary outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device provides a propagation delay of 45 ns, a maximum power supply current of 10 mA, and supports a load capacitance of 15 pF. It is housed in a 16-pin PDIP package and is characterized for operation from 0 °C to 70 °C.
Feature Summary
- Provides high-speed data selection using the Low Power Schottky process
- Includes on-chip select logic decoding for simplified address input
- Offers both assertion and negation outputs with 3-state capability
Applications
- Universal function generator for logic functions of four variables
- Data routing and selection between multiple sources
- Parallel-to-serial conversion circuits
Procurement Notes
Verify that the ordering suffix NE4 corresponds to the specified RoHS-compliant NIPDAU lead finish and standard catalog status. Confirm the active production status and ensure the 16-pin PDIP package matches the design requirements. Check for any specific environmental or military qualification needs if operating outside the commercial temperature range.
Selection Notes
Select this component when an 8-input multiplexer with complementary outputs is required. The LS series offers a balance of speed and low power consumption suitable for general-purpose digital logic applications. Ensure the system operates within the 4.75 V to 5.25 V supply voltage limits and the 0 °C to 70 °C temperature range.
Part Context
This part belongs to the SN74LS251 family of 8-input multiplexers. It is the commercial grade version of the SN54LS251, which is qualified for military and defense applications over a wider temperature range. The device is part of the broader 74LS logic series known for its compatibility with standard TTL systems.
Replacement Considerations
SN74LS251N
FAQ
Does the SN74LS251NE4 provide both true and complement outputs?
Yes, the device includes both assertion (true) and negation (complement) outputs.
What is the maximum propagation delay for this multiplexer?
The maximum propagation delay is 45 ns.
