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SI5368C-B-GQ Datasheet(PDF) 9 Page - Silicon Laboratories

No. de pieza SI5368C-B-GQ
Descripción Electrónicos  ANY-RATE PRECISION CLOCK MULTIPLIER/JITTER ATTENUATOR
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Fabricante Electrónico  SILABS [Silicon Laboratories]
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SI5368C-B-GQ Datasheet(HTML) 9 Page - Silicon Laboratories

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Si5368
Preliminary Rev. 0.3
9
13
57
CS0_C3A
CS1_C4A
I/O
LVCMOS
Input Clock Select/CKIN3 or CKIN4 Active Clock Indicator.
If manual clock selection is chosen, and if CKSEL_PIN =1, the
CKSEL pins control clock selection and the CKSEL_REG bits
are ignored.
If CKSEL_PIN =0, the CKSEL_REG register bits control this
function and these inputs tristate. If these pins are not function-
ing as the CS[1:0] inputs and auto clock selection is enabled,
then they serve as the CKIN_n active clock indicator.
0 = CKIN3 (CKIN4) is not the active input clock
1 = CKIN3 (CKIN4) is currently the active input to the PLL
The CKn_ACTV_REG bit always reflects the active clock status
for CKIN_n. If CKn_ACTV_PIN = 1, this status will also be
reflected on the CnA pin with active polarity controlled by the
CK_ACTV_POL bit. If CKn_ACTV_PIN = 0, this output tristates.
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 exter-
nal oscillator based reference. If a single-ended external refer-
ence is used, ac couple 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 pins.
21
FS_ALIGN
I
LVCMOS
FSYNC Alignment Control.
If FSYNC_ALIGN_PIN = 1 and CK_CONFIG = 1, a logic high
on this pin causes the FS_OUT phase to be realigned to the ris-
ing edge of the currently active input sync (CKIN_3 or CKIN_4).
If FSYNC_ALIGN_PIN = 0, this pin is ignored and the
FSYNC_ALIGN_REG bit performs this function.
0 = No realignment.
1 = Realign.
This pin has a weak pull-down.
29
30
CKIN4+
CKIN4–
IMULTI
Clock Input 4.
Differential clock input. This input can also be driven with a sin-
gle-ended signal. CKIN4 serves as the frame sync input associ-
ated with the CKIN2 clock when CK_CONFIG_REG =1.
Table 3. Si5368 Pin Descriptions (Continued)
Pin #
Pin Name
I/O
Signal Level
Description
Note: Internal register names are indicated by underlined italics, e.g. INT_PIN. See Si5368 Register Map.
CS[1:0]
Active Input Clock
00
CKIN1
01
CKIN2
10
CKIN3
11
CKIN4


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