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| Product attributes | Property Value |
| Manufacturer | Fairchild Semiconductor |
| Product Series | 74ACT |
| 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 | 24mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | 24-DIP (0.300", 7.62mm) |
| Supplier Device Package | 24-PDIP |
The 74ACT646SPC from Fairchild Semiconductor is a non-inverting transceiver in the 74ACT logic family. It operates from 4.5V to 5.5V, making it suitable for traditional 5V systems. This single-channel transceiver features 3-State outputs, enabling bidirectional data flow on shared buses. With a balanced output current of 24mA source and sink, it can drive standard TTL loads effectively. The device is housed in a 24-DIP package, which is convenient for through-hole PCB designs and prototyping. It operates over an industrial temperature range of -40°C to 85°C. Typical applications include data bus interfacing, peripheral control, and industrial automation.
- Bidirectional Data Flow: Allows data transfer in both directions, reducing component count.
- TTL-Compatible Inputs: Directly interfaces with 5V TTL logic without extra circuitry.
- 3-State Outputs: Facilitates bus sharing and reduces power when idle.
- Through-Hole DIP Package: Easy to solder and prototype, ideal for legacy designs.
5V Bidirectional Bus Transceiver
Use the 74ACT646SPC to interface two 5V data buses in microprocessor systems. The 3-State outputs prevent bus contention when multiple devices are active.
Data Acquisition Systems
In DAQ systems, this transceiver buffers data between an ADC and a microcontroller. The 24mA drive ensures reliable data transfer over short distances.
Legacy 5V Logic Interfacing
When connecting older 5V TTL logic to newer CMOS devices, this transceiver provides the necessary voltage and current compatibility.
Peripheral Device Control
Drive control signals to printers or external peripherals. The bidirectional nature allows for both command and status data flow.
Industrial Automation I/O
In PLC I/O modules, this transceiver buffers signals between the backplane and field devices, providing robust 5V logic levels.
Prototyping and Education
The DIP package makes it easy to use on breadboards for educational projects involving bus architecture and bidirectional communication.
- Q: What logic family is the 74ACT646SPC?
- A: It belongs to the 74ACT family, which is advanced CMOS with TTL-compatible inputs.
- Q: What is the function of this device?
- A: It is a non-inverting transceiver with 1 channel, allowing bidirectional data flow.
- Q: What is the output type?
- A: It has 3-State outputs for bus-oriented applications.
- Q: What voltage does it operate at?
- A: It operates from 4.5V to 5.5V, standard for 5V systems.
- Q: What is the output current?
- A: It can source and sink 24mA, suitable for driving TTL loads.
- Q: What package is it available in?
- A: It comes in a 24-DIP (0.300", 7.62mm) package, ideal for through-hole prototyping.
74ACT646SPC.pdf
- Q: What logic family is the 74ACT646SPC?
- A: It belongs to the 74ACT family, which is advanced CMOS with TTL-compatible inputs.
- Q: What is the function of this device?
- A: It is a non-inverting transceiver with 1 channel, allowing bidirectional data flow.
- Q: What is the output type?
- A: It has 3-State outputs for bus-oriented applications.
- Q: What voltage does it operate at?
- A: It operates from 4.5V to 5.5V, standard for 5V systems.
- Q: What is the output current?
- A: It can source and sink 24mA, suitable for driving TTL loads.
- Q: What package is it available in?
- A: It comes in a 24-DIP (0.300", 7.62mm) package, ideal for through-hole prototyping.