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SN74LVC257APWR 数据表(PDF) 10 Page - Texas Instruments

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部件名 SN74LVC257APWR
功能描述  Quadruple 2-Line to 1-Line Data Selectors
Download  30 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74LVC257APWR 数据表(HTML) 10 Page - Texas Instruments

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4Y
3Y
2Y
1Y
A/B
OE
4B
4A
3B
3A
2B
2A
1B
1A
4
2
3
7
5
6
9
11
10
12
14
13
1
15
SN54LVC257A, SN74LVC257A
SCAS294O – JANUARY 1993 – REVISED JUNE 2015
www.ti.com
9 Detailed Description
9.1 Overview
These quadruple 2-line to 1-line data selectors and multiplexers are designed for 1.65-V to 3.6-V VCC operation.
The SNx4LVC257A devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in
bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at a
high logic level.
9.2 Functional Block Diagram
9.3 Feature Description
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 and 5-V system environment. Device features a maximum tpd of 4.6 ns allowing the device to be
used in high-speed applications as well.
To ensure the high-impedance state during power up or power down, OE must be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
9.4 Device Functional Modes
Table 1 lists the functional modes for the SN54LVC257A and SN74LVC257A devices.
Table 1. Function Table
INPUTS
OUTPUT
Y
OE
A/B
A
B
H
X
X
X
Z
L
L
L
X
L
L
L
H
X
H
L
H
X
L
L
L
H
X
H
H
10
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Copyright © 1993–2015, Texas Instruments Incorporated
Product Folder Links: SN54LVC257A SN74LVC257A


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