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SN74AHC245DWG4 Arkusz danych(PDF) 10 Page - Texas Instruments

Numer części SN74AHC245DWG4
Szczegółowy opis  SNx4AHC245 Octal Bus Transceivers With 3-State Outputs
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DIR
OE
A1
B1
To Seven Other Channels
1
2
19
18
SN54AHC245, SN74AHC245
SCLS230J – OCTOBER 1995 – REVISED JULY 2014
www.ti.com
9 Detailed Description
9.1 Overview
These octal bus transceivers are designed for asynchronous two-way communication between data buses. The
control-function implementation minimizes external timing requirements. The SNx4AHC245 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 be used to disable the device so that the buses
are effectively isolated. To ensure the high-impedance state during power up or power down, OE should be tied
to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability
of the driver.
9.2 Functional Block Diagram
9.3 Feature Description
VCC is optimized at 5 V
Allows down voltage translation from 5 V to 3.3 V
Inputs accept voltage levels up to 5.5 V
Slow edge rates minimize output ringing
9.4 Device Functional Modes
Table 1. Function Table
(Each Transceiver)
INPUTS
OPERATION
OE
DIR
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
10
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Product Folder Links: SN54AHC245 SN74AHC245


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