74ACT1284 IEEE 1284 Transceiver
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
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A Ports have standard 4 mA totem pole outputs
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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 鈥淴鈥?to the ordering code.
Logic Symbol
Connection Diagram
Pin Descriptions
Pin Names
HD
DIR
A
1
- A
4
B
1
- B
4
A
5
- A
7
B
5
- B
7
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
FACT錚?is a trademark of Fairchild Semiconductor Corporation.
漏 1999 Fairchild Semiconductor Corporation
DS011683
www.fairchildsemi.com
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