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SI5380 Datasheet(PDF) 42 Page - Silicon Laboratories |
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SI5380 Datasheet(HTML) 42 Page - Silicon Laboratories |
42 / 53 page Table 9.1. Pin Descriptions Pin Name Pin Number Pin Type1 Function XA 8 I Crystal Input. Input pin for external crystal (XTAL). Alterna- tively these pins can be driven with an external reference clock (REFCLK). An internal register bit selects XTAL or REFCLK mode. Default is XTAL mode. Single-ended inputs must be connected to the XA pin, with the XB pin appropri- ately terminated. XB 9 I X1 7 I XTAL Shield. Connect these pins directly to the crystal ground pins. Both the X1/X2 pins and Crystal ground pins should be separated from the PCB ground plane. Refer to the Reference Manual for layout guidelines. X2 10 I IN0 63 I Clock Inputs. These pins accept an input clock for syn- chronizing the device. They support both differential and single-ended clock signals. Refer to 3.3.1 Input Configura- tion and Terminations for input termination options. These pins are high-impedance and must be terminated externally, when being used. The negative side of the differential input must be ac-grounded when accepting a single-ended clock. Unused inputs may be left unconnected. IN0b 64 I IN1 1 I IN1b 2 I IN2 14 I IN2b 15 I IN3/FB_IN 61 I Clock Input 3/External Feedback Input. By default, these pins are used as the 4th clock input (IN3/ IN3b). They can also be used as the external feedback in- put (FB_IN/FB_INb) for the optional zero delay mode. See section 5.3.6 for details on the optional zero delay mode. IN3b/FB_INb 62 I Outputs Si5380 Rev D Data Sheet Pin Description silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 41 |
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