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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74LS |
| 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 | Surface Mount |
| Package / Case | 20-SSOP (0.209", 5.30mm Width) |
| Supplier Device Package | 20-SSOP |
The SN74LS640DB is an 8-bit inverting transceiver from the 74LS family, featuring 3-state outputs. It operates from 4.75V to 5.25V, with 15mA sink and 24mA source current. This device is designed for bidirectional bus communication in 5V TTL systems, offering reliable signal buffering. The 20-SSOP package is compact for various applications. Typical uses include microprocessor buffering, industrial controls, and memory expansion.
- Low-Power Schottky (74LS): Consumes less power than standard TTL, reducing heat.
- 3-State Outputs: Enables bus multiplexing and safe disconnection.
- TTL-Compatible: Works directly with 5V TTL logic without level shifting.
- Inverting Function: Provides signal inversion where required, saving external gates.
Legacy 5V TTL Bus Interfacing
Use the SN74LS640DB to connect two 5V TTL buses with inversion, ideal for retro or industrial systems.
Microprocessor System Buffering
Buffer address/data lines in 5V microprocessor systems, improving fan-out and signal integrity.
Industrial Control Logic
In 5V industrial controllers, it can handle bidirectional communication between logic boards.
Memory Expansion Boards
For 5V memory expansion, it buffers data lines between the CPU and additional memory chips.
Test Equipment Interfaces
In 5V test equipment, it provides reliable data transfer between measurement modules and display units.
Educational Lab Projects
For 5V TTL lab experiments, it demonstrates transceiver operation with 3-state control.
- Q: What logic family is the SN74LS640DB?
- A: It belongs to the 74LS family, a low-power Schottky TTL logic family.
- Q: What is the function of this IC?
- A: It is an inverting transceiver with 3-state outputs, for bidirectional data flow.
- Q: How many channels does it have?
- A: It has 1 channel (8-bit) for data transmission.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for bus sharing and isolation.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, standard for 5V TTL systems.
- Q: What package is available?
- A: It comes in a 20-SSOP (0.209", 5.30mm Width) package.
SN74LS640DB.pdf
- Q: What logic family is the SN74LS640DB?
- A: It belongs to the 74LS family, a low-power Schottky TTL logic family.
- Q: What is the function of this IC?
- A: It is an inverting transceiver with 3-state outputs, for bidirectional data flow.
- Q: How many channels does it have?
- A: It has 1 channel (8-bit) for data transmission.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for bus sharing and isolation.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, standard for 5V TTL systems.
- Q: What package is available?
- A: It comes in a 20-SSOP (0.209", 5.30mm Width) package.