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SN74CB3Q3257PWR Arkusz danych(PDF) 10 Page - Texas Instruments

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Numer części SN74CB3Q3257PWR
Szczegółowy opis  FET Multiplexer/Demultiplexer
Download  25 Pages
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

SN74CB3Q3257PWR Arkusz danych(HTML) 10 Page - Texas Instruments

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4
15
2
3
1
RON
7
5
6
RON
9
11
10
RON
12
14
13
RON
SN74CB3Q3257
Bus
Controller
4
4
Device 1
Device 2
4
16
8
GND
4A
3A
2A
1A
VCC
S
1B1
1B2
2B1
2B2
3B1
3B2
4B1
4B2
OE
0.1 2F
VCC
SN74CB3Q3257
SCDS135B – SEPTEMBER 2003 – REVISED JUNE 2015
www.ti.com
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The SN74CB3Q3257 can be used to multiplex and demultiplex up to 4 channels simultaneously in a 2:1
configuration. The application shown here is a 4-bit bus being multiplexed between two devices. the OE and S
pins are used to control the chip from the bus controller. This is a very generic example, and could apply to many
situations. If an application requires less than 4 bits, be sure to tie the A side to either high or low on unused
channels.
9.2 Typical Application
Figure 5. Typical Application of the SN74CB3Q3257
9.2.1 Design Requirements
1. Recommended Input Conditions:
For specified high and low levels, see VIH and VIL in Recommended Operating Conditions.
Inputs and outputs are overvoltage tolerant slowing them to go as high as 4.6 V at any valid VCC.
2. Recommended Output Conditions:
Load currents should not exceed ±128 mA per channel.
3. Frequency Selection Criterion:
Maximum frequency tested is 500 MHz.
Added trace resistance/capacitance can reduce maximum frequency capability; use layout practices as
directed in Layout.
9.2.2 Detailed Design Procedure
The 0.1-µF capacitor should be place as close as possible to the device.
10
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Product Folder Links: SN74CB3Q3257


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