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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 54HC |
| Packaging | | |
| 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 | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | -55°C ~ 125°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | 24-CDIP (0.600", 15.24mm) |
| Supplier Device Package | 24-CDIP |
| ROHS |  |
The CD54HC646F3A is a high-speed CMOS octal transceiver from Texas Instruments, featuring non-inverting data paths and 3-State outputs. It operates over a wide 2V to 6V supply range, making it versatile for both 3.3V and 5V applications. The device includes internal registers for data storage, enabling synchronous bus operations. Packaged in a rugged 24-pin ceramic CDIP, it is designed for extended temperature ranges (-55°C to 125°C), making it suitable for military and industrial environments. Its 7.8mA drive current ensures reliable signal transmission in moderate-load applications.
- Wide 2V to 6V Supply Range: Seamlessly interfaces between 3.3V and 5V logic, reducing the need for level shifters.
- Built-in Registers: Allows data latching for synchronous transfer, simplifying timing design.
- Extended Temperature Range (-55°C to 125°C): Suitable for harsh military and industrial environments.
- Hermetic Ceramic Package: Provides superior protection against moisture and mechanical stress.
Wide-Voltage Bus Transceivers
The CD54HC646F3A is ideal for interfacing between 3.3V and 5V logic systems in mixed-voltage environments. Its 2V to 6V supply range allows direct connection to both voltage domains without external level shifters, simplifying PCB design.
Registered Data Storage and Transfer
With built-in registers, this transceiver can latch data before transmission, making it perfect for synchronous bus applications. Use it in microprocessor systems where data must be held stable during read/write cycles.
Military and Aerospace Electronics
Rated for -55°C to 125°C and packaged in a hermetic ceramic CDIP, this IC is suitable for extreme environments. It can be used in avionics data buses and satellite telemetry systems where reliability is critical.
Industrial Process Controllers
In factory automation, this transceiver buffers signals between a central PLC and remote I/O modules. The 3-State outputs prevent bus contention when multiple modules communicate over a shared backplane.
Bidirectional Data Paths in Test Equipment
Use the CD54HC646F3A in benchtop instruments to route data bidirectionally between a microcontroller and external memory or peripherals. The non-inverting path preserves data polarity, reducing firmware complexity.
Legacy System Integration
When upgrading old 5V-only systems to newer 3.3V controllers, this transceiver bridges the gap. Its high-impedance 3-State outputs allow safe power sequencing during system startup.
- Q: What logic family does the CD54HC646F3A belong to?
- A: It is part of the 54HC (High-Speed CMOS) logic family, offering a wide operating voltage range.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) non-inverting transceiver with 3-State outputs, featuring separate registers for storage.
- Q: How many channels does it have?
- A: It has 1 channel of 8 bits, providing bidirectional data transfer.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for bus sharing and multiplexing.
- Q: What is the voltage range?
- A: It operates from 2V to 6V, making it compatible with both 3.3V and 5V systems.
- Q: What package is it available in?
- A: It comes in a 24-pin CDIP (Ceramic Dual In-line Package) with a 0.600-inch width.
CD54HC646F3A.pdf
- Q: What logic family does the CD54HC646F3A belong to?
- A: It is part of the 54HC (High-Speed CMOS) logic family, offering a wide operating voltage range.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) non-inverting transceiver with 3-State outputs, featuring separate registers for storage.
- Q: How many channels does it have?
- A: It has 1 channel of 8 bits, providing bidirectional data transfer.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for bus sharing and multiplexing.
- Q: What is the voltage range?
- A: It operates from 2V to 6V, making it compatible with both 3.3V and 5V systems.
- Q: What package is it available in?
- A: It comes in a 24-pin CDIP (Ceramic Dual In-line Package) with a 0.600-inch width.