TL16C752D Datasheet, PDF (47/56 Pages) Texas Instruments – TL16C752D Dual UART With 64-Byte FIFO

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TL16C752D
SLLSEN8B – SEPTEMBER 2015 – REVISED MARCH 2016
10 Power Supply Recommendations
The power supply must provide a constant voltage with a 10% maximum variation of the nominal value and has
to be able to provide at least the maximum current consumption of the device for the selected nominal voltage
only for the UART device:
• 4.5 mA for V_CC = 1.8 V
• 9 mA for V_CC = 2.5 V
• 16 mA for V_CC = 3.3 V
• 40 mA for V_CC = 5 V
The VCC pin must have a 1-µF bypass capacitor placed as close as possible to this pin. Also, TI recommends to
include two extra capacitors in parallel, which should also be placed as close as possible to the VCC pin. The
suggested values for these extra capacitors are 0.1 µF and 0.01 µF, respectively.
VCC_UART
C14
1 µF
C15
0.1 µF
C16
0.01 µF
Place as close as possible to the VCC pin of the UART.
Figure 43. Recommended Bypass Capacitors Array
11 Layout
11.1 Layout Guidelines
Traces, Vias, and Other PCB Components: A right angle in a trace can cause more radiation. The capacitance
increases in the region of the corner, and the characteristic impedance changes. This impedance change causes
reflections.
• Avoid right-angle bends in a trace and try to route them at least with two 45° corners. To minimize any
impedance change, the best routing would be a round bend (see Figure 24).
• Separate high-speed signals (for example, clock signals) from low-speed signals and digital from analog
signals; again, placement is important.
• To minimize crosstalk not only between two signals on one layer but also between adjacent layers, route
them with 90° to each other
Figure 44. Layout Do's and Don'ts
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