onsemi Logic - Logic - Buffers, Drivers, Receivers, Transceivers - DM74ALS640AN DM74ALS640AN

The DM74ALS640AN is an inverting octal bus transceiver designed for asynchronous two-way communication between data buses. It can transmit data from the A bus to the B bus or vice versa, depending on the level of the direction control (DIR) input. The device features an enable input (G) that allows for isolation of the buses when disabled. This transceiver operates with a supply voltage range of 4.5V to 5.5V and supports input voltages up to 7V for control inputs and 5.5V for I/O ports. It is rated for operation in a temperature range of 0¬8C to +70¬8C and has a storage temperature range of -65¬8C to +150¬8C. The device is available in a 20-lead plastic dual-in-line package (PDIP). Key electrical characteristics include a propagation delay time of 10 to 11 ns, a high-level output current of up to -15 mA, and a low-level output current of up to 24 mA. The device is suitable for applications requiring reliable data transmission with minimal loading on inputs, thanks to its PNP input design.