Texas Instruments SN54LS245FK, SN54LS245J, SN74LS245DBR, SN74LS245DW, SN74LS245DWR Datasheet
...
SOIC
DW
LS245
CDIP
J
55°C to 125°C
SN54LS245, SN74LS245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002
D
3-State Outputs Drive Bus Lines Directly
D
PNP Inputs Reduce dc Loading on Bus
Lines
D
Hysteresis at Bus Inputs Improves Noise
Margins
D
Typical Propagation Delay Times Port to
Port, 8 ns
I
OL
TYPE
SN54LS245 12 mA –12 mA
SN74LS245 24 mA –15 mA
(SINK
CURRENT)
I
OH
(SOURCE
CURRENT)
description
These octal bus transceivers are designed for
asynchronous two-way communication between
data buses. The control-function implementation
minimizes external timing requirements.
The devices allow data transmission from the
A bus to the B bus or from the B bus to the A bus,
depending on the logic level at the
direction-control (DIR) input. The output-enable
(OE
) input can disable the device so that the
buses are effectively isolated.
SN54LS245 ...J OR W PACKAGE
SN74LS245 ... DB, DW, N, OR NS PACKAGE
SN54LS245 . . . FK P ACKAGE
A3
A4
A5
A6
A7
(TOP VIEW)
1
DIR
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8
GND
10
(TOP VIEW)
A2A1DIR
3 2 1 20 19
4
5
6
7
8
910111213
A8
B8
20
19
18
17
16
15
14
13
12
11
V
B7
CC
V
OE
B1
B2
B3
B4
B5
B6
B7
B8
OE
18
17
16
15
14
B6
CC
B1
B2
B3
B4
B5
GND
T
A
PDIP – N Tube SN74LS245N SN74LS245N
0°C to 70°C
SOP – NS Tape and reel SN74LS245NSR 74LS245
SSOP – DB T ape and reel SN74LS245DBR LS245
°
–
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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.
°
CFP – W Tube SNJ54LS245W SNJ54LS245W
LCCC – FK Tube SN54LS245FK SN54LS245FK
ORDERING INFORMA TION
PACKAGE
–
–
†
Tube SN74LS245DW
Tape and reel SN74LS245DWR
Tube SN54LS245J SN54LS245J
Tube SNJ54LS245J SNJ54LS245J
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
Copyright 2002, 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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
1
SN54LS245, SN74LS245
OPERATION
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002
schematics of inputs and outputs
FUNCTION TABLE
INPUTS
OE DIR
L L B data to A bus
L H A data to B bus
H X Isolation
EQUIVALENT OF EACH INPUT
V
CC
9 kΩ NOM
Input
logic diagram (positive logic)
DIR
TYPICAL OF ALL OUTPUTS
V
CC
50 Ω NOM
Output
1
19
OE
2
2
A1
To Seven Other Channels
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
18
B1
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