Overview
The SN74HC251NS is a data selector/multiplexer integrated circuit produced by Texas Instruments. It is part of the 74HC series, known for its high-speed CMOS logic. This device is designed to select one of eight data sources and provide the selected data on its output, making it a versatile component in digital circuit design. The SN74HC251NS features 3-state outputs, which can be set to a high-impedance state, allowing multiple devices to share the same bus line without interference.
Key Specifications
| Part Number | SN74HC251NS |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Logic ICs |
| Subcategory | Signal Switches, Multiplexers, Decoders |
| Series | 74HC |
| Type | Multiplexer |
| Circuit | 1 x 8:1 |
| Independent Circuits | 1 |
| Current - Output High, Low | 7.8mA, 7.8mA |
| Voltage Supply Source | Single Supply |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Through Hole |
| Package / Case | 16-SO (6.20 mm x 5.30 mm) |
Key Features
- 3-state version of the 'HC151, allowing outputs to be set to a high-impedance state
- Wide operating voltage range of 2 V to 6 V
- High-current 3-state outputs capable of driving up to 15 LSTTL loads
- Low power consumption with a maximum ICC of 80 μA
- Typical propagation delay of 9 ns
- ±6-mA output drive at 5 V
- Low input current of 1 μA max
- Ability to perform parallel-to-serial conversion
- Complementary outputs providing true and inverted data
Applications
The SN74HC251NS is suitable for various digital circuit applications, including:
- Data selection and multiplexing in digital systems
- Parallel-to-serial conversion
- Bus-oriented systems where multiple devices need to share the same bus line
- Low-power digital circuits requiring high-speed logic operations
- Embedded systems, microcontrollers, and other digital control systems
Q & A
- What is the primary function of the SN74HC251NS?
The primary function is to select one of eight data sources and provide the selected data on its output.
- What is the operating voltage range of the SN74HC251NS?
The operating voltage range is from 2 V to 6 V.
- What type of outputs does the SN74HC251NS have?
The device has 3-state outputs that can be set to a high-impedance state.
- How many LSTTL loads can the SN74HC251NS drive?
It can drive up to 15 LSTTL loads.
- What is the typical propagation delay of the SN74HC251NS?
The typical propagation delay is 9 ns.
- What is the maximum power consumption of the SN74HC251NS?
The maximum power consumption is 80 μA.
- Can the SN74HC251NS perform parallel-to-serial conversion?
Yes, it can perform parallel-to-serial conversion.
- What is the package type of the SN74HC251NS?
The package type is 16-SO (Small Outline).
- What is the operating temperature range of the SN74HC251NS?
The operating temperature range is from -40°C to 85°C.
- Is the SN74HC251NS RoHS compliant?
Yes, the SN74HC251NS is RoHS compliant.
