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| Product attributes | Property Value |
| Manufacturer | Harris Corporation |
| Product Series | 74HC |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Transceiver, 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 | 20-DIP (0.300", 7.62mm) |
| Supplier Device Package | 20-PDIP |
The CD74HC640EX is a high-speed CMOS inverting transceiver from Harris Corporation, designed for bidirectional asynchronous communication. It features 3-State outputs and operates over a wide 2V to 6V supply range, making it ideal for mixed-voltage systems. With a single channel (8-bit bus) and a 20-pin DIP package, it provides a robust solution for bus interfacing, signal buffering, and level shifting in industrial and consumer electronics.
- Wide 2V to 6V Supply Range: Ensures compatibility with both 3.3V and 5V logic systems, simplifying mixed-voltage design.
- 3-State Outputs: Allows for bus isolation and prevents data contention in shared-line applications.
- Extended Temperature Range (-55°C to 125°C): Suitable for demanding industrial and automotive environments.
- Inverting Functionality: Provides signal inversion without additional components, saving board space.
Bidirectional Bus Interfacing
Use the CD74HC640EX to connect two 8-bit data buses in microprocessor systems. The 3-State outputs and bidirectional nature allow either bus to drive the other without signal contention, controlled by the direction and output enable pins.
Signal Inversion in Data Paths
When a system requires inverted logic levels, this transceiver provides a clean, buffered inversion. This is useful in control lines or data paths where an active-low signal is needed, ensuring proper logic levels without extra discrete gates.
Level Shifting Between 3.3V and 5V Logic
With a wide 2V to 6V supply range, the CD74HC640EX can be powered at 5V while accepting 3.3V inputs, or vice versa. This makes it a simple solution for interfacing mixed-voltage systems, protecting lower-voltage components.
Buffering for High-Fanout Applications
In systems where a single output must drive multiple inputs, this transceiver provides the necessary current buffering. Its high-impedance inputs and strong outputs prevent signal degradation and ensure reliable operation.
Industrial Control Logic
In industrial environments, the wide temperature range (-55°C to 125°C) makes it suitable for harsh conditions. It can buffer and invert signals between PLCs, sensors, and actuators, ensuring robust communication.
Memory Address/Data Bus Isolation
In memory systems, the 3-State outputs allow the transceiver to be completely isolated from the bus when not in use. This prevents loading effects and allows multiple memory banks to share the same data lines.
- Q: What is the logic family of the CD74HC640EX?
- A: It belongs to the 74HC (High-Speed CMOS) logic family, offering a good balance of speed and power efficiency.
- Q: What is the function of this IC?
- A: It is an inverting transceiver, meaning it can transmit data bidirectionally while inverting the signal logic level.
- Q: How many channels does it have?
- A: It has 1 channel, which typically represents an 8-bit bus in a 20-pin package.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for connection to a shared bus without contention.
- Q: What is the operating voltage range?
- A: It operates from 2V to 6V, making it compatible with both 3.3V and 5V systems.
- Q: What package is available?
- A: It is available in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.
CD74HC640EX.pdf
- Q: What is the logic family of the CD74HC640EX?
- A: It belongs to the 74HC (High-Speed CMOS) logic family, offering a good balance of speed and power efficiency.
- Q: What is the function of this IC?
- A: It is an inverting transceiver, meaning it can transmit data bidirectionally while inverting the signal logic level.
- Q: How many channels does it have?
- A: It has 1 channel, which typically represents an 8-bit bus in a 20-pin package.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for connection to a shared bus without contention.
- Q: What is the operating voltage range?
- A: It operates from 2V to 6V, making it compatible with both 3.3V and 5V systems.
- Q: What package is available?
- A: It is available in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.