SN74LS640 - Octal bus transceivers

These octal bus transceivers are designed for asynchronous two-way communication between data buses. The devices transmit data from the A bus to the B bus or from the B bus to the A bus depending upon the level at the direction control (DIR) input. The enable input (G) can be used to disable the device so the buses are effectively isolated.

The -1 versions of the SN74LS640 thru SN74LS642, SN74LS644, and SN74LS645 are identical to the standard versions except that the recommended maximum I_OL is increased to 48 milliamperes. There are no -1 versions of the SN54LS640 thru SN54LS642, SN54LS644, and SN54LS645.

The SN54LS640 thru SN54LS642, SN54LS644, and SN54LS645 are characterized for operation over the full military tempearture range of –55°C to 125°C. The SN74LS640 thru SN74LS642, SN74LS644, and SN74LS645 are characterized for operation from 0°C to 70°C.

Products containing the "SN74LS640" keyword are: SN74LS640-1DW , SN74LS640-1DW , SN74LS640-1DWE4 , SN74LS640-1DWG4 , SN74LS640-1N , SN74LS640-1N , SN74LS640-1NE4 , SN74LS640-1NG4 , SN74LS640-1NS , SN74LS640-1NSR , SN74LS640-1NSR , SN74LS640DBR , SN74LS640DBR , SN74LS640DBRG4 , SN74LS640DW , SN74LS640DW , SN74LS640DW W/DOT , SN74LS640DWG4 , SN74LS640DWR , SN74LS640DWR

• SN74LS64X-1 Versions Rated at I_OL of 48 mA
• Bi-directional Bus Transceivers in High-Density 20-Pin Packages
• Hysteresis at Bus Inputs Improves Noise Margins
• Choice of True or Inverting Logic
• Choice of 3-State or Open-collector Outputs