Datasheet
SCAS459D − NOVEMBER 1994 − REVISED OCTOBER 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D 4.5-V to 5.5-V V
CC
Operation
D Inputs Accept Voltages to 5.5 V
D Max t
pd
of 20 ns at 5 V
D 3-State Outputs Directly Drive Bus Lines
D Flow-Through Architecture Optimizes PCB
Layout
D Center-Pin V
CC
and GND Configurations
Minimize High-Speed Switching Noise
D ESD Protection Exceeds JESD 22
− 2000-V Human-Body Model (A114-A)
− 200-V Machine Model (A115-A)
D Designed for the IEEE 1284-I (Level-1 Type)
and IEEE 1284-II (Level-2 Type) Electrical
Specifications
description/ordering information
The ’ACT1284 devices are designed for
asynchronous two-way communication between
data buses. The control function minimizes
external timing requirements.
The devices allow data transmission in either the
A-to-B or the B-to-A direction for bits 1, 2, 3, and
4, depending on the logic level at the
direction-control (DIR) input. Bits 5, 6, and 7,
however, always transmit in the A-to-B direction.
The output drive for each mode is determined by the high-drive (HD) control pin. When HD is high, the high drive
is delivered by the totem-pole configuration, and when HD is low, the outputs are open drain. This meets the
drive requirements as specified in the IEEE 1284-I (level-1 type) and the IEEE 1284-II (level-2 type) parallel
peripheral-interface specification.
ORDERING INFORMATION
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
SOIC − DW
Tube SN74ACT1284DW
ACT1284
SOIC − DW
Tape and reel SN74ACT1284DWR
ACT1284
0°C to 70°C
SOP − NS Tape and reel SN74ACT1284NSR ACT1284
0°C to 70°C
SSOP − DB Tape and reel SN74ACT1284DBR AU284
TSSOP − PW
Tube SN74ACT1284PW
AU284
TSSOP − PW
Tape and reel SN74ACT1284PWR
AU284
CDIP − J Tube SNJ54ACT1284J SNJ54ACT1284J
−55°C to 125°C
CFP − W Tube SNJ54ACT1284W SNJ54ACT1284W
−55 C to 125 C
LCCC − FK Tube SNJ54ACT1284FK SNJ54ACT1284FK
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright 2003, Texas Instruments Incorporated
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications o
f
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
A1
A2
A3
A4
GND
GND
A5
A6
A7
DIR
B1
B2
B3
B4
V
CC
V
CC
B5
B6
B7
HD
SN54ACT1284 ...J OR W PACKAGE
SN74ACT1284 . . . DB, DW, NS, OR PW PACKAGE
(TOP VIEW)
3212019
9
10 11 12 13
4
5
6
7
8
18
17
16
15
14
B3
B4
V
CC
V
CC
B5
A4
GND
GND
A5
A6
SN54ACT1284 . . . FK PACKAGE
(TOP VIEW)
A3
A2
A1
B7
B6
B2
A7
DIR
HD
B1