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ST16C2550IQ48 Datasheet(PDF) 11 Page - Exar Corporation |
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ST16C2550IQ48 Datasheet(HTML) 11 Page - Exar Corporation |
11 / 39 page xr ST16C2550 REV. 4.4.0 2.97V TO 5.5V DUART WITH 16-BYTE FIFO 11 To obtain maximum data rate, it is necessary to use full rail swing on the clock input. See external clock operating frequency over power supply voltage chart in Figure 6. FIGURE 5. EXTERNAL CLOCK CONNECTION FOR EXTENDED DATA RATE FIGURE 6. OPERATING FREQUENCY VERSUS POWER SUPPLY CHART. Requires a 2K ohms pull-up resistor on XTAL2 pin to increase operating speed 2K XTAL1 XTAL2 R1 VCC External Clock vcc gnd 60 50 40 30 3.0 4.5 5.5 3.5 4.0 5.0 S uppy V oltage 70 80 85oC 25oC -40oC O perating frequency for S T 16C 2550 w ith external clock and a 2K ohm s pull-up resistor on X T A L2 pin. |
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