SN74LS642 - Octal bus transceivers with open collector outputs

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 "SN74LS642" keyword are: SN74LS642-1DW , SN74LS642-1DW , SN74LS642-1N , SN74LS642-1NE4 , SN74LS642DW , SN74LS642DWG4 , SN74LS642DWG4 , SN74LS642DWR2 , SN74LS642N , SN74LS642N , SN74LS642NE4 , SN74LS642NG4 , SN74LS642NS , SN74LS642NSR , SN74LS642NSR , SN74LS642NSRG4

• 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