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SN74CB3T3245PWG4 数据表(PDF) 11 Page - Texas Instruments

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部件名 SN74CB3T3245PWG4
功能描述  8-Bit FET Bus Switch
Download  28 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74CB3T3245PWG4 数据表(HTML) 11 Page - Texas Instruments

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WORST
BETTER
BEST
1W min.
W
VI − Input Voltage − V
0.0
1.0
2.0
3.0
4.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
VCC = 3 V
IO = 1 mA
TA = 25 C
°
VI − Input Voltage − V
0.0
1.0
2.0
3.0
4.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
VCC = 2.3 V
IO = 1 mA
TA = 25 C
°
SN74CB3T3245
www.ti.com
SCDS136B – OCTOBER 2003 – REVISED JUNE 2015
Typical Application (continued)
9.2.3 Application Curves
Figure 9. Data Output Voltage vs Data Input Voltage
Figure 10. Data Output Voltage vs Data Input Voltage
10 Power Supply Recommendations
The power supply can be any voltage between the minimum and maximum supply voltage rating located in the
Recommended Operating Conditions.
Each VCC terminal should have a good bypass capacitor to prevent power disturbance. For devices with a single
supply, a 0.1-
μF bypass capacitor is recommended. If there are multiple pins labeled VCC, then a 0.01-μF or
0.022-
μF capacitor is recommended for each VCC because the VCC pins will be tied together internally. For
devices with dual supply pins operating at different voltages, for example VCC and VDD, a 0.1-µF bypass
capacitor is recommended for each supply pin. It is acceptable to parallel multiple bypass capacitors to reject
different frequencies of noise. 0.1-
μF and 1-μF capacitors are commonly used in parallel. The bypass capacitor
should be installed as close to the power terminal as possible for best results.
11 Layout
11.1 Layout Guidelines
Reflections and matching are closely related to the loop antenna theory but are different enough to be discussed
separately from the theory. When a PCB trace turns a corner at a 90° angle, a reflection can occur. A reflection
occurs primarily because of the change of width of the trace. At the apex of the turn, the trace width increases to
1.414 times the width. This increase upsets the transmission-line characteristics, especially the distributed
capacitance and self–inductance of the trace which results in the reflection. Not all PCB traces can be straight
and therefore some traces must turn corners. Figure 11 shows progressively better techniques of rounding
corners. Only the last example (BEST) maintains constant trace width and minimizes reflections.
11.2 Layout Example
Figure 11. Trace Example
Copyright © 2003–2015, Texas Instruments Incorporated
Submit Documentation Feedback
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