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| Product attributes | Property Value |
| Manufacturer | Harris Corporation |
| Product Series | 54HCT |
| 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 | - |
| Voltage - Supply | 4.5V ~ 5.5V |
| 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 |
The CD54HCT646F3A is a high-speed silicon-gate CMOS octal bus transceiver from Harris Corporation. Operating from 4.5V to 5.5V, this non-inverting transceiver features 3-State outputs and a single 8-bit channel. It is designed for bidirectional asynchronous communication between data buses, with a typical propagation delay of only 13ns. Housed in a robust 24-pin ceramic DIP, it operates over the full military temperature range of -55°C to 125°C, making it suitable for demanding aerospace and industrial applications.
- Military Temperature Range (-55°C to 125°C): Ensures reliable operation in extreme environments, ideal for defense and aerospace.
- TTL-Compatible Inputs: Simplifies mixing with legacy 5V TTL logic without additional level shifters.
- 3-State Outputs: Allows multiple devices to share a common bus safely, preventing data corruption.
- Ceramic DIP Package: Provides superior thermal conductivity and hermetic sealing for long-term reliability.
Bidirectional Bus Interfacing
Use the CD54HCT646F3A to connect two 8-bit data buses in microprocessor systems. Its 3-State outputs prevent bus contention and allow multiple devices to share the same lines.
High-Reliability Aerospace Systems
With a -55°C to 125°C temperature range and ceramic package, this transceiver is ideal for avionics and satellite control units where extreme temperatures are common.
TTL-to-CMOS Level Translation
The 54HCT family accepts TTL voltage levels while providing CMOS output swings, enabling seamless interfacing between legacy TTL logic and modern CMOS peripherals.
Memory Address/Data Buffering
Buffer address or data lines between a CPU and SRAM/EPROM. The non-inverting function preserves signal integrity, and 3-State outputs allow memory sharing.
Industrial Process Controllers
In factory automation, this transceiver can drive control signals over long backplanes. The wide temperature range ensures reliable operation in unheated plant floors.
Redundant System Switching
Use the 3-State feature to switch between redundant controller boards. Only the active board drives the bus, while the standby board remains high-impedance.
- Q: What is the logic family of the CD54HCT646F3A?
- A: It belongs to the 54HCT logic family, offering high-speed CMOS performance with TTL-compatible inputs.
- Q: What is the function of this IC?
- A: It is a non-inverting transceiver with 3-State outputs, ideal for bidirectional bus communication.
- Q: How many channels does it have?
- A: It features 1 channel (8-bit) for data transmission.
- Q: What is the operating voltage range?
- A: It operates from 4.5V to 5.5V, making it suitable for standard 5V systems.
- Q: What package is available?
- A: It comes in a 24-CDIP (0.600", 15.24mm) ceramic dual-inline package.
- Q: What is the temperature range?
- A: It is rated for military temperature range from -55°C to 125°C.
CD54HCT646F3A.pdf
- Q: What is the logic family of the CD54HCT646F3A?
- A: It belongs to the 54HCT logic family, offering high-speed CMOS performance with TTL-compatible inputs.
- Q: What is the function of this IC?
- A: It is a non-inverting transceiver with 3-State outputs, ideal for bidirectional bus communication.
- Q: How many channels does it have?
- A: It features 1 channel (8-bit) for data transmission.
- Q: What is the operating voltage range?
- A: It operates from 4.5V to 5.5V, making it suitable for standard 5V systems.
- Q: What package is available?
- A: It comes in a 24-CDIP (0.600", 15.24mm) ceramic dual-inline package.
- Q: What is the temperature range?
- A: It is rated for military temperature range from -55°C to 125°C.