74ACT1284
Description
The 74ACT1284 contains four non-inverting bidirectional buffers and three non-inverting buffers with open Drain outputs and high drive capability on the B Ports. It is intended to provide a standard signaling method for a bi-direction parallel peripheral in an Extended Capabilities Port mode (ECP). The HD (active HIGH) input pin enables the B Ports to switch from open Drain to a high drive totem pole output, capable of sourcing 14 m A on all seven buffers. The DIR input determines the direction of data flow on the bidirectional buffers. DIR (active HIGH) enables data flow from A Ports to B Ports. DIR (active LOW) enables data flow from B Ports to A Ports.
Features s TTL-patible inputs s A Ports have standard 4 m A totem pole outputs s Typical input hysteresis of 0.5V s B Port high drive source/sink capability of 14 m A s Bidirectional non-inverting buffers s Supports IEEE P1284 Level 1 and Level 2 signaling standards for bidirectional parallel munications between personal...
