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| PartNumber | SN74LS640N | SN74LS640N TI | SN74LS640ND |
| Description | Bus Transceivers Octal Bus | - Bulk (Alt: SN74LS640ND) | |
| Manufacturer | Texas Instruments | - | - |
| Product Category | Logic - Buffers, Drivers, Receivers, Transceivers | - | - |
| Series | 74LS | - | - |
| Product | Standard Transceiver | - | - |
| Packaging | Tube Alternate Packaging | - | - |
| Unit Weight | 0.042297 oz | - | - |
| Mounting Style | Through Hole | - | - |
| Package Case | PDIP-20 | - | - |
| Operating Temperature | 0°C ~ 70°C | - | - |
| Mounting Type | Through Hole | - | - |
| Output Type | 3-State/Open Collector | - | - |
| Function | Octal Bus Transceiver | - | - |
| Number of Channels | 8 | - | - |
| Voltage Supply | 4.75 V ~ 5.25 V | - | - |
| Supplier Device Package | 20-PDIP | - | - |
| Number of Circuits | 8 | - | - |
| Number of Elements | 1 | - | - |
| Current Output High Low | 15mA, 24mA | - | - |
| Logic Type | Transceiver, Inverting | - | - |
| Number of Bits per Element | 8 | - | - |
| Maximum Operating Temperature | + 70 C | - | - |
| Minimum Operating Temperature | 0 C | - | - |
| Polarity | Inverting | - | - |
| Supply Voltage Max | 5.25 V | - | - |
| Supply Voltage Min | 4.75 V | - | - |
| Logic Family | LS | - | - |
| Propagation Delay Time | 15 ns | - | - |
| Output Level | TTL | - | - |
| Input Level | TTL | - | - |
| High Level Output Current | - 15 mA | - | - |
| Low Level Output Current | 24 mA | - | - |