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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74AS |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Input Type | - |
| Output Type | 3-State |
| Current - Output High, Low | 15mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 20-SO |
| ROHS |  |
The SN74AS245NS is an octal bus transceiver from Texas Instruments' 74AS family, engineered for high-speed bidirectional data transfer in 5V systems. It operates from a 4.5V to 5.5V supply and features 3-State outputs for bus sharing. With a robust output current of 15mA sink and 24mA source, it can drive moderate capacitive loads while maintaining fast edge rates. The device is specified for 0°C to 70°C commercial operation and comes in a 20-pin SOIC package, ideal for space-constrained surface-mount designs. Its Advanced Schottky technology provides a superior speed-power product compared to older LS parts, making it suitable for performance-critical applications.
- Advanced Schottky Speed: Faster propagation delays (typically 5ns) compared to LS logic, enabling higher system clock rates.
- Wide Supply Tolerance (4.5V-5.5V): Provides better noise immunity and compatibility with slightly out-of-spec power supplies.
- Compact SOIC-20 Package: Reduces PCB footprint, allowing for denser board layouts in space-limited designs.
- 3-State Outputs: Facilitates bus multiplexing and prevents data corruption from multiple drivers.
High-Speed Data Bus Switching
In high-performance computing systems, the SN74AS245NS provides fast bidirectional data transfer between CPU and memory. The Advanced Schottky technology offers propagation delays as low as 5ns, enabling operation at higher clock frequencies than standard LS parts.
Server Backplane Communication
In server motherboards, this transceiver buffers data lines between the chipset and expansion slots. The 24mA source capability ensures clean signal transmission across the backplane, reducing data errors in high-speed environments.
Telecommunications Line Card Interface
In telecom switching equipment, the device interfaces between the control processor and line interface modules. The 3-State outputs allow multiple line cards to share a common control bus without interference.
Industrial Control Signal Distribution
In factory automation, this buffer can distribute control signals from a PLC to multiple actuators. The 15mA sink current is sufficient to drive optocouplers or small relays, providing isolation between control and power circuits.
Test and Measurement Equipment
In oscilloscopes and logic analyzers, the transceiver routes data between acquisition hardware and display processors. The fast switching speed preserves signal integrity when capturing high-frequency waveforms.
Memory Module Buffering
In memory modules, this IC can buffer address and data lines between the edge connector and memory chips. The 3-State outputs prevent bus contention during memory refresh cycles.
- Q: What logic family is the SN74AS245NS?
- A: It belongs to the 74AS (Advanced Schottky) TTL family, offering higher speed than standard LS with lower power than pure Schottky.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) non-inverting bus transceiver, providing bidirectional data transfer between two buses.
- Q: How many channels does it have?
- A: It has 1 channel with 8 bits, controlled by a direction pin (DIR) and an output enable pin (OE).
- Q: What is the output type?
- A: The outputs are 3-State, allowing the device to be disconnected from the bus when not in use.
- Q: What is the operating voltage range?
- A: The recommended supply voltage is 4.5V to 5.5V, providing a wider tolerance than standard LS logic.
- Q: What package is available?
- A: It is offered in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.209-inch (5.30mm) body width, suitable for surface-mount assembly.
SN74AS245NS.pdf
- Q: What logic family is the SN74AS245NS?
- A: It belongs to the 74AS (Advanced Schottky) TTL family, offering higher speed than standard LS with lower power than pure Schottky.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) non-inverting bus transceiver, providing bidirectional data transfer between two buses.
- Q: How many channels does it have?
- A: It has 1 channel with 8 bits, controlled by a direction pin (DIR) and an output enable pin (OE).
- Q: What is the output type?
- A: The outputs are 3-State, allowing the device to be disconnected from the bus when not in use.
- Q: What is the operating voltage range?
- A: The recommended supply voltage is 4.5V to 5.5V, providing a wider tolerance than standard LS logic.
- Q: What package is available?
- A: It is offered in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.209-inch (5.30mm) body width, suitable for surface-mount assembly.