Description
The 74HC257 is a high-speed, silicon-gate CMOS Quad 2-Input Multiplexer featuring 3-state outputs. This device selects four bits of data from two independent sources (A or B) and steers them to four common outputs (Y) under the control of a common Select (S) input.
Because the device features 3-state outputs, it is highly optimized for bus-oriented systems, allowing multiple multiplexers to be connected to the same bus line without signal contention. When the Output Enable (OE) input is set to HIGH, the outputs enter a high-impedance (OFF) state, effectively disconnecting the IC from the bus.
Note: Product images are shown for reference only. The actual product may vary in appearance, manufacturer marking, or logo depending on stock availability.
Features
- Quad (4) independent 2-to-1 multiplexers
- 3-state outputs for bus-sharing capability
- Common select (S) and output enable (OE) controls
- High-speed CMOS (HC) technology
- Wide operating voltage range (2V to 6V)
- Low power consumption
- DIP-16 through-hole package
Benefits
- Simplifies data routing between two different sources (e.g., CPU vs. DMA)
- 3-state control prevents bus contention in complex multi-master systems
- High drive capability suitable for capacitive bus loading
- Low-power CMOS operation reduces thermal output in high-density designs
Applications
- Data Bus Multiplexing
- Memory and Peripheral Selection
- Digital Signal Routing
- Input Selection for Microprocessor Systems
- General Purpose Digital Logic Multiplexing
Package Includes
- 1 x 74HC257 Quad 2-input multiplexer IC (DIP-16 Package)
Specifications
| Parameter | Specification |
|---|---|
| Product Name | 74HC257 |
| Device Type | Quad 2-Input Multiplexer |
| Logic Family | 74HC (High-Speed CMOS) |
| Output Type | 3-State |
| Package / Case | DIP-16 |
| Mounting Type | Through-Hole |
| Shipping Weight | 0.001 kg |
| Shipping Dimensions | 4 x 4 x 1 cm |
