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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, 48mA |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 20-SO |
The SN74LS640-1NS is a single-channel inverting transceiver from the 74LS logic family. It operates from a 4.75V to 5.25V supply and features 3-State outputs for bus-oriented applications. With a sink current of 48mA and source current of 15mA, it can drive moderate loads. This IC is suitable for 5V digital systems requiring bidirectional data transfer with signal inversion.
- High Sink Current (48mA): Can drive low-impedance loads and long bus lines effectively.
- 3-State Outputs: Allows multiple devices to share a common bus without contention.
- Inverting Function: Provides signal inversion where needed, reducing external component count.
- Standard 74LS Logic Family: Ensures compatibility with existing 5V TTL logic designs.
Bidirectional Bus Interfacing
Use the SN74LS640-1NS for bidirectional data flow between two buses in 5V systems. Its inverting nature and 3-State outputs allow for controlled data direction and bus isolation.
Signal Inversion and Buffering
Employ this transceiver to invert and buffer digital signals while providing high drive current (48mA sink) to drive heavier loads without signal degradation.
Memory Address/Data Line Driving
In legacy 5V memory systems, this IC can buffer address or data lines, providing the necessary current to drive multiple memory chips while maintaining signal integrity.
Industrial Control Logic
In industrial controllers operating at 5V, the SN74LS640-1NS can interface between a control logic unit and peripheral devices, offering robust 3-State isolation for shared data lines.
Test Equipment and Instrumentation
For bench-top instruments, this transceiver can be used to route and invert test signals, enabling flexible signal routing in a 5V test setup.
- Q: What is the logic family of the SN74LS640-1NS?
- A: It belongs to the 74LS (Low-power Schottky) logic family.
- Q: What is the function of this IC?
- A: It is an inverting transceiver with 1 channel, featuring 3-State outputs.
- Q: What is the operating voltage range?
- A: The supply voltage range is 4.75V to 5.25V.
- Q: What is the output current capability?
- A: It can source/sink 15mA and 48mA respectively.
- Q: What package is available?
- A: It comes in a 20-SOIC (0.209", 5.30mm Width) package.
- Q: What is the temperature range?
- A: It operates from 0°C to 70°C (TA).
SN74LS640-1NS.pdf
- Q: What is the logic family of the SN74LS640-1NS?
- A: It belongs to the 74LS (Low-power Schottky) logic family.
- Q: What is the function of this IC?
- A: It is an inverting transceiver with 1 channel, featuring 3-State outputs.
- Q: What is the operating voltage range?
- A: The supply voltage range is 4.75V to 5.25V.
- Q: What is the output current capability?
- A: It can source/sink 15mA and 48mA respectively.
- Q: What package is available?
- A: It comes in a 20-SOIC (0.209", 5.30mm Width) package.
- Q: What is the temperature range?
- A: It operates from 0°C to 70°C (TA).