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74ACT1284MSA Arkusz danych(PDF) 1 Page - Fairchild Semiconductor |
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74ACT1284MSA Arkusz danych(HTML) 1 Page - Fairchild Semiconductor |
1 / 7 page © 1999 Fairchild Semiconductor Corporation DS011683 www.fairchildsemi.com June 1996 Revised November 1999 74ACT1284 IEEE 1284 Transceiver General Description The 74ACT1284 contains four non-inverting bidirectional buffers and three non-inverting buffers with open Drain out- puts 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 mA on all seven buffers. The DIR input determines the direction of data flow on the bidirec- tional 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-compatible inputs s A Ports have standard 4 mA totem pole outputs s Typical input hysteresis of 0.5V s B Port high drive source/sink capability of 14 mA s Bidirectional non-inverting buffers s Supports IEEE P1284 Level 1 and Level 2 signaling standards for bidirectional parallel communications between personal computers and printing peripherals s B Port outputs in High Impedance mode during power down s Guaranteed 4000V minimum ESD protection Ordering Code: Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code. Logic Symbol Pin Descriptions Connection Diagram FACT is a trademark of Fairchild Semiconductor Corporation. Order Number Package Number Package Description 74ACT1284SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 74ACT1284MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide 74ACT1284MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Pin Names Description HD High Drive Enable input (Active HIGH) DIR Direction Control Input A1 - A4 Side A Inputs or Outputs B1 - B4 Side B Inputs or Outputs A5 - A7 Side A Inputs B5 - B7 Side B Outputs |
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