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SI5366 Datasheet(PDF) 9 Page - Silicon Laboratories |
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SI5366 Datasheet(HTML) 9 Page - Silicon Laboratories |
9 / 20 page Si5366 Preliminary Rev. 0.2 9 13 57 CS0_C3A CS1_C4A I/O LVCMOS Input Clock Select/CKINn Active Clock Indicator. If manual clock selection mode is chosen (AUTOSEL = L), the CS[1:0] pins function as the manual input clock selector con- trol. These inputs are internally deglitched to prevent inadvertent clock switching during changes in the CSn input state. If automatic clock detection is chosen (AUTOSEL = M or H), these pins function as the CKINn active clock indicator output. 0 = CKINn is not the active input clock. 1 = CKINn is currently the active input clock to the PLL. This pin has a weak pull-down. 16 17 XA XB IANALOG External Crystal or Reference Clock. External crystal should be connected to these pins to use inter- nal oscillator based reference. If external reference is used, apply reference clock to XA input and leave XB pin floating. External reference must be from a high-quality clock source (TCXO, OCXO). Frequency of crystal or external clock is set by the RATE pin. When used with an external 38.88 MHz refer- ence, AC couple to XA and leave XB as a no connect. 20 FS_SW I LVCMOS FSYNC Inputs to Clock Selection Enable. If CK_CONF = 1, this pin enables the use of the CKIN3 and CKIN4 loss-of-signal indicators as inputs to the clock selection state machine. 0 = Do not use CKIN3 and CKIN4 LOS indicators as inputs to the clock selection state machine. 1 = Use CKIN3 and CKIN4 LOS indicators as inputs to the clock selection state machine. This pin has a weak pull-down. 21 FS_ALIGN I LVCMOS FSYNC Alignment Control. If CK_CONF = 1, a logic high on this pin causes the FS_OUT phase to be realigned to the rising edge of the currently active input sync (CKIN3 or CKIN4). 0 = No realignment. 1 = Realignment. This pin has a weak pull-down. 22 AUTOSEL I 3-Level Manual/Automatic Clock Selection. Three level input that selects the method of input clock selec- tion to be used. L = Manual. M = Automatic non-revertive. H = Automatic revertive. Table 3. Si5366 Pin Descriptions (Continued) Pin # Pin Name I/O Signal Level Description CS[1:0] Active Input Clock 00 CKIN1 01 CKIN2 10 CKIN3 11 CKIN4 |
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