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SN74AHC540PWR bảng dữ liệu(PDF) 9 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Octal Buffers/Drivers
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OE1
OE2
To Seven Other Channels
A1
Y1
SN54AHC540, SN74AHC540
www.ti.com
SCLS260L – DECEMBER 1995 – REVISED OCTOBER 2015
8 Detailed Description
8.1 Overview
The SNx4AHC540 octal buffers/drivers are ideal for driving bus lines or buffer memory address registers. These
devices feature inputs and outputs on opposite sides of the package to facilitate printed circuit board layout.
The 3-state control gate is a two-input AND gate with active-low inputs. If either output-enable (OE1 or OE2)
input is high, all corresponding outputs are in the high-impedance state. The outputs provide non-inverted data
when they are not in the high-impedance state.
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.
8.2 Functional Block Diagram
8.3 Feature Description
SNx4AHC540 device has a wide operating voltage range and operates from 2 V to 5.5 V. The inputs accept
voltages up to 5.5 V, which allows for down translation. Slow input edges and low drive will minimize output
overshoots and undershoots.
8.4 Device Functional Modes
Table 1 shows the device functions for each buffer and driver.
Table 1. Function Table (Each Buffer/Driver)
INPUTS
OUTPUT
Y
OE1
OE2
A
L
L
L
L
L
L
H
H
H
X
X
Z
X
H
X
Z
Copyright © 1995–2015, Texas Instruments Incorporated
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