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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74HC |
| 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 | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | -55°C ~ 125°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | 24-DIP (0.300", 7.62mm) |
| Supplier Device Package | 24-PDIP |
The CD74HC646EN is a high-speed CMOS octal bus transceiver from Texas Instruments, designed for non-inverting bidirectional data transfer. Operating from 2V to 6V, it features 3-state outputs with 7.8mA drive capability. This 74HC logic device is ideal for mixed-voltage systems, automotive electronics, and industrial controls. Its wide temperature range (-55°C to 125°C) ensures reliable operation in harsh environments. The 24-pin DIP package is suitable for through-hole assembly, providing a robust solution for bus interfacing and signal buffering.
- Wide Supply Range (2V to 6V): Compatible with 3.3V and 5V logic, reducing the need for level shifters.
- Extended Temperature Range (-55°C to 125°C): Suitable for automotive and military-grade applications.
- Low Power CMOS: Consumes minimal quiescent current, ideal for battery-powered devices.
- 3-State Outputs: Allows multiple devices to share a bus without conflict.
Mixed-Voltage Bus Interfacing
With a 2V to 6V supply range, the CD74HC646EN can interface between 3.3V and 5V logic systems, providing level shifting without additional components.
Automotive ECU Communication
The wide temperature range (-55°C to 125°C) makes it ideal for under-hood automotive electronics, buffering CAN or LIN bus signals.
Industrial Process Control
In factory automation, this transceiver buffers sensor data and control signals over long cable runs, with 7.8mA drive capability.
Portable Instrumentation
For battery-powered devices, the 74HC family's low power consumption extends battery life while maintaining high-speed operation.
FPGA/CPLD Interface Buffering
Use it to buffer I/O lines between an FPGA and external peripherals, protecting the FPGA from external electrical noise.
Telecom Switching Systems
In telecom equipment, it handles high-speed data routing between backplanes and line cards, ensuring signal integrity.
- Q: What is the logic family of the CD74HC646EN?
- A: It belongs to the 74HC (High-speed CMOS) logic family.
- Q: What is the function of this IC?
- A: It is a non-inverting octal bus transceiver with 3-state outputs.
- Q: How many channels does it have?
- A: It has 1 channel (8-bit) for bidirectional data transfer.
- Q: What is the output type?
- A: The outputs are 3-State, enabling connection to shared data buses.
- Q: What is the operating voltage range?
- A: It operates from 2V to 6V, making it versatile for 3.3V and 5V systems.
- Q: What is the temperature range?
- A: It operates from -55°C to 125°C, suitable for extreme environments.
CD74HC646EN.pdf
- Q: What is the logic family of the CD74HC646EN?
- A: It belongs to the 74HC (High-speed CMOS) logic family.
- Q: What is the function of this IC?
- A: It is a non-inverting octal bus transceiver with 3-state outputs.
- Q: How many channels does it have?
- A: It has 1 channel (8-bit) for bidirectional data transfer.
- Q: What is the output type?
- A: The outputs are 3-State, enabling connection to shared data buses.
- Q: What is the operating voltage range?
- A: It operates from 2V to 6V, making it versatile for 3.3V and 5V systems.
- Q: What is the temperature range?
- A: It operates from -55°C to 125°C, suitable for extreme environments.