
SN54ACT245, SN74ACT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS452D – SEPTEMBER 1994 – REVISED JANUARY 2000
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Inputs Are TTL-Voltage Compatible
EPIC
(Enhanced-Performance Implanted
CMOS) 1- m Process
Package Options Include Plastic
Small-Outline (DW) Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK) and
Flatpacks (W), and Standard Plastic (N) and
Ceramic (J) DIPs
description
These octal bus transceivers are designed for
asynchronous two-way communication between
data buses. The control-function implementation
minimizes external timing requirements.
When the output-enable (OE) is low, the device
passes noninverted data from the A bus to the B
bus or from the B bus to the A bus, depending
upon the logic level at the direction-control (DIR)
input. A high on
OE
disables the device so that the
buses are effectively isolated.
The SN54ACT245 is characterized for operation
over the full military temperature range of –55
°
C
to 125
°
C. The SN74ACT245 is characterized for
operation from –40
°
C to 85
°
C.
FUNCTION TABLE
(each transceiver)
INPUTS
OE
OPERATION
DIR
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
Copyright
2000, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
EPIC is a trademark of Texas Instruments Incorporated.
SN54ACT245 . . . J OR W PACKAGE
SN74ACT245 . . . DB, DW, N, OR PW PACKAGE
(TOP VIEW)
3
2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
SN54ACT245 . . . FK PACKAGE
(TOP VIEW)
A
A
D
B
B
O
A
G
B
V
C
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
OE
B1
B2
B3
B4
B5
B6
B7
B8
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.