Overview
The SN74HC251N is a data selector/multiplexer integrated circuit produced by Texas Instruments. It is designed to select one of eight data sources and features strobe-controlled complementary 3-state outputs. This device is part of the HC (High-Speed CMOS) logic family and is known for its wide operating voltage range and high-current 3-state outputs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 2 V to 6 V | V |
| Operating Free-Air Temperature | −55 to 125 °C | °C |
| Input Current | 1 μA max | μA |
| Output Drive at 5 V | ±6 mA | mA |
| Propagation Delay Time (tpd) | 9 ns (typical at 5 V) | ns |
| Package Type | 16-PDIP (Through Hole) | |
| Package Dimensions | 19.31 mm × 6.35 mm | mm |
| Junction-to-Ambient Thermal Resistance | 67 °C/W | °C/W |
Key Features
- 3-state version of the 'HC151, with strobe-controlled complementary 3-state outputs.
- Wide operating voltage range of 2 V to 6 V.
- High-current 3-state outputs that can interface directly with system bus or drive up to 15 LSTTL loads.
- Low power consumption, with a maximum ICC of 80 μA.
- Typical propagation delay time of 9 ns at 5 V.
- Low input current of 1 μA max.
- Capable of performing parallel-to-serial conversion.
- Complementary outputs provide true and inverted data.
Applications
- Data selection and multiplexing in digital systems.
- Parallel-to-serial conversion in communication systems.
- Bus-oriented systems where high-current 3-state outputs are necessary.
- Low-power digital circuits requiring wide operating voltage ranges.
- General-purpose logic circuits in industrial, automotive, and consumer electronics.
Q & A
- What is the operating voltage range of the SN74HC251N?
The operating voltage range is from 2 V to 6 V.
- What is the typical propagation delay time of the SN74HC251N at 5 V?
The typical propagation delay time is 9 ns.
- How many LSTTL loads can the SN74HC251N drive?
The device can drive up to 15 LSTTL loads.
- What is the maximum input current of the SN74HC251N?
The maximum input current is 1 μA.
- What type of outputs does the SN74HC251N have?
The device has strobe-controlled complementary 3-state outputs.
- What is the package type of the SN74HC251N?
The package type is 16-PDIP (Through Hole).
- What are the dimensions of the 16-PDIP package?
The dimensions are 19.31 mm × 6.35 mm.
- What is the junction-to-ambient thermal resistance of the SN74HC251N in the 16-PDIP package?
The junction-to-ambient thermal resistance is 67 °C/W.
- Can the SN74HC251N perform parallel-to-serial conversion?
- What kind of outputs do the complementary outputs of the SN74HC251N provide?
The complementary outputs provide true and inverted data.
