74ACT1284

74ACT1284 IEEE 1284 Transceiver

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74ACT1284 IEEE 1284 Transceiver

June 1996 Revised November 2000

74ACT1284 IEEE 1284 Transceiver
General 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 mA 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-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:
Order Number 74ACT1284SC 74ACT1284MSA 74ACT1284MTC Package Number M20B MSA20 MTC20 Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.

Logic Symbol Connection Diagram

Pin Descriptions
Pin Names HD DIR A1 - A4 B1 - B4 A5 - A7 B5 - B7 Description High Drive Enable input (Active HIGH) Direction Control Input Side A Inputs or Outputs Side B Inputs or Outputs Side A Inputs Side B Outputs

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2000 Fairchild Semiconductor Corporation

DS011683

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