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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74ALS |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 4 |
| 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 | 14-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 14-SO |
The SN74ALS243ANS is a quad bidirectional transceiver from Texas Instruments, part of the 74ALS logic family. It operates from a 4.5V to 5.5V supply, with output drive capability of 15mA (sink) and 24mA (source). The device features 3-state outputs and a single 4-bit channel, making it ideal for data bus applications. Housed in a compact 14-pin SOIC package, it is designed for 5V systems requiring bidirectional data flow with minimal power consumption. Common applications include microprocessor bus isolation and memory interfacing.
- Bidirectional Data Flow: Simplifies read/write operations on shared buses.
- High Source Current (24mA): Drives capacitive loads and long traces effectively.
- 3-State Outputs: Enables bus sharing with multiple devices.
- Low Power 74ALS Technology: Reduces heat generation in dense systems.
- Compact SOIC Package: Saves PCB space for portable designs.
Microprocessor Bus Isolation
Use the SN74ALS243ANS to isolate the CPU data bus from peripherals. The 3-state outputs allow the bus to be released when not in use, preventing data conflicts.
Memory Read/Write Controllers
Interface a memory controller to SRAM or ROM. The bidirectional transceiver simplifies read and write operations by routing data in both directions on a single bus.
Industrial Sensor Networks
Connect multiple sensors to a central PLC. The transceiver allows bidirectional communication over a shared twisted-pair bus, reducing wiring complexity.
Legacy 5V Peripheral Interfacing
Bridge between a 5V microcontroller and older 5V peripherals like ADCs or DACs. The 15mA/24mA drive capability ensures robust signal levels.
Test Equipment Channel Switching
In automated test systems, use this transceiver to route data between a controller and multiple measurement modules, enabling fast channel selection.
Audio Mixing Consoles
For digital audio control signals, this transceiver can buffer and route control data between the main processor and channel strips, ensuring clean signal distribution.
- Q: What logic family does the SN74ALS243ANS belong to?
- A: It is part of the 74ALS family, known for low power consumption and high speed.
- Q: What is the function of this device?
- A: It is a quad bus transceiver with non-inverting data paths, enabling bidirectional data flow.
- Q: How many channels does it have?
- A: It has 1 channel, which is 4 bits wide, providing a 4-bit bidirectional interface.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for connection to a shared data bus.
- Q: What is the voltage range?
- A: It operates from 4.5V to 5.5V, suitable for standard 5V logic systems.
- Q: What package is it available in?
- A: It comes in a 14-pin SOIC (0.209", 5.30mm Width) package.
SN74ALS243ANS.pdf
- Q: What logic family does the SN74ALS243ANS belong to?
- A: It is part of the 74ALS family, known for low power consumption and high speed.
- Q: What is the function of this device?
- A: It is a quad bus transceiver with non-inverting data paths, enabling bidirectional data flow.
- Q: How many channels does it have?
- A: It has 1 channel, which is 4 bits wide, providing a 4-bit bidirectional interface.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for connection to a shared data bus.
- Q: What is the voltage range?
- A: It operates from 4.5V to 5.5V, suitable for standard 5V logic systems.
- Q: What package is it available in?
- A: It comes in a 14-pin SOIC (0.209", 5.30mm Width) package.