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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74LS |
| 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 | 4.75V ~ 5.25V |
| 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 SN74LS646NT3 is an octal bus transceiver from Texas Instruments' 74LS family, designed for bidirectional data transfer in 5V digital systems. It features both registered and transparent operating modes, providing flexibility for data latching or direct pass-through. The 3-State outputs allow for bus sharing, while the 15mA sink and 24mA source current capability ensures compatibility with standard TTL loads. Operating from a 4.75V to 5.25V supply, this device is specified for 0°C to 70°C commercial temperature range. Housed in a 24-pin DIP package, it is ideal for through-hole PCB designs, prototyping, and legacy system maintenance.
- Registered and Transparent Modes: Provides built-in data latching capability, eliminating external flip-flops and simplifying design.
- Widely Available 24-Pin DIP Package: Easy to handle, solder, and replace in existing through-hole designs.
- Proven 74LS Technology: Reliable and well-understood logic family with extensive documentation and design support.
- 3-State Outputs: Enables multiple devices to share a common bus without electrical conflicts.
Microprocessor Bus Isolation
In 8-bit microprocessor systems, the SN74LS646NT3 can isolate the CPU data bus from peripherals. The registered mode allows the CPU to write data and continue processing while the transceiver holds the data on the output bus, improving system throughput.
Data Latching in Industrial Controllers
In PLCs and industrial controllers, this transceiver can latch output data to hold actuator states. The internal registers eliminate the need for external flip-flops, saving board space and reducing component cost.
Bidirectional Communication in Test Equipment
In benchtop instruments, the transceiver enables bidirectional data flow between a measurement module and a display/control unit. The 3-State outputs allow multiple instruments to share a common GPIB or custom parallel bus.
Memory Address/Data Multiplexing
In systems with multiplexed address/data buses (e.g., 8085/8088), this device can separate address and data signals. The transparent mode passes data directly, while the registered mode can hold address information during the data phase.
Legacy 5V System Interfacing
For maintaining older 5V TTL-based equipment, this IC provides a reliable interface to newer logic. Its 15mA sink capability is sufficient for driving standard TTL loads, ensuring compatibility with existing designs.
Peripheral Device Buffering
When connecting printers or external storage to a computer, this transceiver buffers the data lines. The 24-pin DIP package is easy to prototype on breadboards, making it ideal for hobbyist and educational projects.
- Q: What logic family does the SN74LS646NT3 belong to?
- A: It is part of the 74LS (Low-Power Schottky) TTL logic family, known for its balance of speed and power consumption.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) non-inverting transceiver with registered and transparent modes, allowing for data storage or direct transfer.
- Q: How many channels does it have?
- A: It has 1 channel with 8 bits, providing bidirectional data flow between two buses.
- Q: What is the output type?
- A: The outputs are 3-State, enabling connection to a shared bus with high-impedance state when not active.
- Q: What is the operating voltage range?
- A: The recommended supply voltage is 4.75V to 5.25V, a narrow range typical for 5V TTL logic.
- Q: What package is available?
- A: It comes in a 24-pin DIP (Dual In-line Package) with 0.300-inch (7.62mm) row spacing, suitable for through-hole mounting.
SN74LS646NT3.pdf
- Q: What logic family does the SN74LS646NT3 belong to?
- A: It is part of the 74LS (Low-Power Schottky) TTL logic family, known for its balance of speed and power consumption.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) non-inverting transceiver with registered and transparent modes, allowing for data storage or direct transfer.
- Q: How many channels does it have?
- A: It has 1 channel with 8 bits, providing bidirectional data flow between two buses.
- Q: What is the output type?
- A: The outputs are 3-State, enabling connection to a shared bus with high-impedance state when not active.
- Q: What is the operating voltage range?
- A: The recommended supply voltage is 4.75V to 5.25V, a narrow range typical for 5V TTL logic.
- Q: What package is available?
- A: It comes in a 24-pin DIP (Dual In-line Package) with 0.300-inch (7.62mm) row spacing, suitable for through-hole mounting.