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SN74CB3Q3257PWRG4 Scheda tecnica(PDF) 11 Page - Texas Instruments

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Il numero della parte SN74CB3Q3257PWRG4
Spiegazioni elettronici  FET Multiplexer/Demultiplexer
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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WORST
BETTER
BEST
1W min.
W
0
1
2
3
0
100
200
300
400
500
600
700
800
900 1000
Time (ps)
VIN
VOUT
C001
SN74CB3Q3257
www.ti.com
SCDS135B – SEPTEMBER 2003 – REVISED JUNE 2015
Typical Application (continued)
9.2.3 Application Curve
Figure 6. Propagation Delay (tpd) Simulation Result at VCC = 2.5 V.
10 Power Supply Recommendations
The power supply can be any voltage between the minimum and maximum supply voltage rating listed in the
Absolute Maximum Ratings table.
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 multiple pins are labeled VCC, then a 0.01-μF or 0.022-μF
capacitor is recommended for each VCC because the VCC pins are 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. To reject different frequencies of noise, use multiple bypass capacitors in parallel. Capacitors
with values of 0.1
μF and 1 μF 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 7 shows progressively better techniques of rounding
corners. Only the last example (BEST) maintains constant trace width and minimizes reflections.
11.2 Layout Example
Figure 7. Trace Example
Copyright © 2003–2015, Texas Instruments Incorporated
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