DM54LS245  Product Folder

These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control function implementation minimizes external timing requirements.

The device allows data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic level at the direction control (DIR) input. The enable input (G#) can be used to disable the device so that the buses are effectively isolated.

• Bi-Directional bus transceiver in a high-density 20-pin package
• TRI-STATE outputs drive bus lines directly

• PNP inputs reduce DC loading on bus lines
• Hysteresis at bus inputs improve noise margins
• Typical propagation delay times, port-to-port 8 ns
• Typical enable/disable times 17 ns
• I_OL (sink current) 54LS 12 mA 74LS 24 mA
• I_OH (source current) 54LS -12 mA 74LS -15 mA
• Alternate Military/Aerospace device (54LS245) is available. Contact a National Semiconductor Sales Office/Distributor for specifications.