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• 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 IOL 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. SN74LS64X-1 Versions Rated at IOL of 48 mABi-directional Bus Transceivers in High-Density 20-Pin PackagesHysteresis at Bus Inputs Improves Noise MarginsChoice of True or Inverting LogicChoice of 3-State or Open-collector Outputs
• VCC (V)4.75 to 5.25
• Bits(#)8
• Voltage (Nom) (V)5
• @ Nom Voltage(Max)(Mhz)35
• ICC @ Nom Voltage(Max)(mA)0.09
• tpd @ Nom Voltage(Max)(ns)15
• Output Drive (IOL/IOH)(Max)(mA)-15/24
• Operating Temperature Range (C)0 to 70
• Pin/PackagePDIP20
• RoHS Compliance
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