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74245 datasheet - pdf

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SN54LS245, SN74LS245
SDLS146B – OCTOBER 1976 – REVISED SEPTEMBER 2016
SNx4LS245 Octal Bus Transceivers With 3-State Outputs
1 Features
3 Description




These octal bus transceivers are designed for
asynchronous two-way communication between data
buses. The control-function implementation minimizes
external timing requirements.
1
3-State Outputs Drive Bus Lines Directly
PNP Inputs Reduce DC Loading on Bus Lines
Hysteresis at Bus Inputs Improves Noise Margins
Typical Propagation Delay Times Port to Port,
8 ns
2 Applications




Building Automation
Electronic Point of Sale
Factory Automation and Control
Test and Measurement
The SNx4LS245 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 directioncontrol (DIR) input. The output-enable (OE) input can
disable the device so that the buses are effectively
isolated.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SN54LS245J
CDIP (20)
24.20 mm × 6.92 mm
SN54LS245W
CFP (20)
7.02 mm × 13.72 mm
SN54LS245FK
LCCC (20)
8.89 mm × 8.89 mm
SN74LS245DB
SSOP (20)
7.20 mm × 5.30 mm
SN74LS245DW
SOIC (20)
12.80 mm × 7.50 mm
SN74LS245N
PDIP (20)
24.33 mm × 6.35 mm
SN74LS245NS
SO (20)
12.60 mm × 5.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Logic Diagram (Positive Logic)
DIR
1
19
A1
OE
2
18
B1
To Seven Other Channels
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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.
SN54LS245, SN74LS245
SDLS146B – OCTOBER 1976 – REVISED SEPTEMBER 2016
www.ti.com
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