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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74ALS |
| 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 | 15mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | 24-DIP (0.300", 7.62mm) |
| Supplier Device Package | 24-PDIP |
The SN74ALS646NT is a 74ALS non-inverting transceiver with 3-state outputs, designed for bidirectional data flow in 5V systems. Operating from 4.5V to 5.5V, it supports 15mA source and 24mA sink current, making it suitable for bus interfacing in industrial and commercial applications. The 24-DIP package is ideal for through-hole PCB designs.
- 3-State Outputs: Prevents bus contention, enabling safe multi-device communication.
- Bidirectional Operation: Supports both read and write cycles, simplifying system design.
- High Current Drive (24mA Sink): Drives capacitive loads and long traces reliably.
- DIP Package: Easy to prototype and service in legacy equipment.
Microprocessor Bus Buffering
The 3-state outputs isolate the CPU from memory or peripherals, preventing bus conflicts in 5V systems.
Bidirectional Data Transfer
As a transceiver, it enables data flow in both directions, essential for read/write operations in embedded controllers.
Signal Isolation in Test Equipment
Use the 3-state feature to disconnect sections of a circuit during testing, improving diagnostic accuracy.
Industrial PLC I/O Modules
The 24mA sink current drives optocouplers and relays, providing robust control signals in harsh environments.
Memory Address/Data Multiplexing
It buffers multiplexed address/data lines, reducing loading on the processor and improving timing margins.
Legacy System Upgrades
Drop-in replacement for older 74ALS transceivers, maintaining compatibility while improving availability.
- Q: What is the logic family of the SN74ALS646NT?
- A: It is part of the 74ALS family, offering high-speed bipolar logic performance.
- Q: What function does this IC perform?
- A: It is a non-inverting transceiver with 3-state outputs for bidirectional data transfer.
- Q: How many channels are included?
- A: It has 1 channel (8-bit) for efficient bus communication.
- Q: What is the output type?
- A: 3-State outputs allow connection to shared buses without contention.
- Q: What is the voltage range?
- A: It operates from 4.5V to 5.5V, ideal for 5V systems.
- Q: What package is used?
- A: It comes in a 24-DIP (0.300", 7.62mm) package for through-hole mounting.
SN74ALS646NT.pdf
- Q: What is the logic family of the SN74ALS646NT?
- A: It is part of the 74ALS family, offering high-speed bipolar logic performance.
- Q: What function does this IC perform?
- A: It is a non-inverting transceiver with 3-state outputs for bidirectional data transfer.
- Q: How many channels are included?
- A: It has 1 channel (8-bit) for efficient bus communication.
- Q: What is the output type?
- A: 3-State outputs allow connection to shared buses without contention.
- Q: What is the voltage range?
- A: It operates from 4.5V to 5.5V, ideal for 5V systems.
- Q: What package is used?
- A: It comes in a 24-DIP (0.300", 7.62mm) package for through-hole mounting.