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SN74LVCH245AZXYR Arkusz danych(PDF) 11 Page - Texas Instruments

Numer części SN74LVCH245AZXYR
Szczegółowy opis  Octal Bus Transceivers With 3-State Outputs
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DIR
OE
A1
B1
To Seven Other Channels
1
2
19
18
SN54LVCH245A, SN74LVCH245A
www.ti.com
SCES008P – JULY 1995 – REVISED JULY 2014
9 Detailed Description
9.1 Overview
The SN54LVCH245A octal bus transceiver is designed for 2.7-V to 3.6-V VCC operation, and the
SN74LVCH245A octal bus transceiver is designed for 1.65-V to 3.6-V VCC operation. Inputs can be driven from
either 3.3-V or 5-V devices. This feature allows the use of these devices as translators in a mixed 3.3-V/5-V
system environment.
These devices are designed for asynchronous communication between data buses. These devices transmit data
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 the buses are effectively isolated.
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the
outputs, preventing damaging current backflow through the devices when they are powered down. 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. Active bus-hold
circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or pulldown
resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input circuit and is
not disabled by OE or DIR.
9.2 Functional Block Diagram
9.3 Feature Description
Wide operating voltage range from 1.65 V to 3.6 V
Allows down voltage translation
Inputs accept voltages to 5.5 V
Ioff feature allows voltages on the inputs and outputs when VCC is 0 V
9.4 Device Functional Modes
Table 2. Function Table
INPUTS
OPERATION
OE
DIR
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
Copyright © 1995–2014, Texas Instruments Incorporated
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