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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | |
| 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 | 15mA, 24mA |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | 20-DIP (0.300", 7.62mm) |
| Supplier Device Package | 20-DIP (0.300", 7.62mm) |
The SN74LS640N3 is an octal inverting transceiver from the 74LS family, featuring 3-state outputs for bidirectional bus communication. Operating from 4.75V to 5.25V, it provides 15mA source and 24mA sink current, ensuring robust drive for data lines. The inverting function is ideal for systems requiring signal polarity inversion. Housed in a 20-DIP package, this transceiver is well-suited for legacy TTL designs, industrial controls, and microprocessor-based systems where reliable data transfer is essential.
- High Sink Current (24mA): Drives heavy bus loads and long traces without signal degradation.
- Bidirectional Operation: Simplifies data flow control in microprocessor and memory systems.
- 3-State Outputs: Prevents bus contention when multiple devices share the same lines.
- Through-Hole DIP Package: Easy to prototype and service in legacy equipment.
Bidirectional Bus Transceivers
The SN74LS640N3 is designed for bidirectional data transfer between two buses. Its inverting nature is useful in systems where signal polarity inversion is required.
Memory Data Bus Isolation
In microprocessor systems, this transceiver isolates the data bus from memory during read/write cycles, preventing data corruption and improving signal integrity.
Peripheral Interface in Legacy TTL Systems
With 24mA sink capability, it can drive long cable runs or multiple peripheral loads in industrial equipment, maintaining signal strength over distance.
Level Shifting in Mixed-Logic Environments
While designed for 5V, the 74LS family can interface with older 3.3V logic when pull-ups are used, making it a bridge in legacy systems.
Control Signal Distribution in Test Equipment
The 3-state outputs allow test equipment to share control lines with multiple instruments, enabling automated test setups without bus conflicts.
Data Acquisition Systems
Use this transceiver to route analog-to-digital converter data to a processor, with the inverting function simplifying logic polarity matching.
- Q: What is the logic family of the SN74LS640N3?
- A: It is from the 74LS (Low-Power Schottky) family, known for its speed and low power consumption.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) inverting transceiver with 3-state outputs, allowing bidirectional data flow.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, ideal for standard 5V TTL systems.
- Q: What is the output type?
- A: The outputs are 3-state, enabling bus-oriented applications with high-impedance control.
- Q: What package is available?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.
- Q: What is the output current capability?
- A: It can sink 24mA and source 15mA, providing strong drive for bus lines.
SN74LS640N3.pdf
- Q: What is the logic family of the SN74LS640N3?
- A: It is from the 74LS (Low-Power Schottky) family, known for its speed and low power consumption.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) inverting transceiver with 3-state outputs, allowing bidirectional data flow.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, ideal for standard 5V TTL systems.
- Q: What is the output type?
- A: The outputs are 3-state, enabling bus-oriented applications with high-impedance control.
- Q: What package is available?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.
- Q: What is the output current capability?
- A: It can sink 24mA and source 15mA, providing strong drive for bus lines.