Overview
The SN74HC251NSR is a data selector/multiplexer integrated circuit produced by Texas Instruments. It is a 3-state version of the 'HC151, designed to select one of eight data sources and provide strobe-controlled complementary 3-state outputs. This device is part of the HC family, known for its wide operating voltage range and high-current output capabilities, making it versatile for various digital logic applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 2 V to 6 V | V |
| Maximum ICC (Low Power Consumption) | 80 μA | μA |
| Typical Propagation Delay (tpd) | 9 ns | ns |
| Output Drive at 5 V | ±6 mA | mA |
| Maximum Input Current | 1 μA | μA |
| Operating Free-Air Temperature | −55 to 125 °C | °C |
| Package Type | SO (16 pins) | |
| Package Dimensions | 6.20 mm × 5.30 mm | mm |
| Junction-to-Ambient Thermal Resistance | 64 °C/W | °C/W |
Key Features
- 3-state outputs interface directly with system bus or can drive up to 15 LSTTL loads.
- Wide operating voltage range of 2 V to 6 V.
- Low power consumption with a maximum ICC of 80 μA.
- High-speed operation with a typical propagation delay of 9 ns.
- Complementary outputs provide true and inverted data.
- Strobe-controlled outputs for selective data transfer.
- Perform parallel-to-serial conversion.
Applications
- Digital logic circuits requiring data selection and multiplexing.
- Bus-oriented systems where high-current 3-state outputs are necessary.
- Systems needing low power consumption and high-speed data transfer.
- Parallel-to-serial conversion applications.
- General-purpose digital switching and multiplexing tasks.
Q & A
- What is the operating voltage range of the SN74HC251NSR?
The operating voltage range is from 2 V to 6 V.
- What is the maximum ICC (low power consumption) of the SN74HC251NSR?
The maximum ICC is 80 μA.
- What is the typical propagation delay (tpd) of the SN74HC251NSR?
The typical propagation delay is 9 ns.
- How many LSTTL loads can the 3-state outputs drive?
The 3-state outputs can drive up to 15 LSTTL loads.
- What is the purpose of the strobe-controlled outputs in the SN74HC251NSR?
The strobe-controlled outputs allow for selective data transfer by enabling or disabling the outputs based on the strobe input.
- Can the SN74HC251NSR perform parallel-to-serial conversion?
Yes, the SN74HC251NSR can perform parallel-to-serial conversion.
- What are the package dimensions of the SN74HC251NSR?
The package dimensions are 6.20 mm × 5.30 mm.
- What is the junction-to-ambient thermal resistance of the SN74HC251NSR?
The junction-to-ambient thermal resistance is 64 °C/W.
- What is the operating free-air temperature range of the SN74HC251NSR?
The operating free-air temperature range is from −55 to 125 °C.
- What type of outputs does the SN74HC251NSR provide?
The SN74HC251NSR provides complementary 3-state outputs.
