SI5341_16 Datasheet, PDF (40/53 Pages) Silicon Laboratories – Low-Jitter, 10 or 4-Output, Any-Frequency, Any-Output Clock Generator

Pin Name
Inputs
XA
XB
X1
X2
IN0
IN0b
IN1
IN1b
IN2
IN2b
FB_IN
FB_INb
Pin Number
Si5341
Si5340
Table 9.1. Pin Descriptions
Pin Type¹
Si5341/40 Rev D Data Sheet
Pin Descriptions
Function
8
5
9
6
7
4
10
7
63
43
64
44
1
1
2
2
14
10
15
11
61
41
62
42
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Crystal and External Clock Input. These pins are used to con-
nect an external crystal or an external clock. See 3.3.1 XA/XB
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Clock and Crystal Input and Figure 3.2 XAXB External Crystal and
Clock Connections on page 5 for connection information. If
IN_SEL[1:0] = 11b, then the XAXB input is selected. If the XAXB
input is not used and powered down, then both inputs can be left
unconnected. ClockBuilder Pro will power down an input that is
set as "Unused".
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XTAL Shield. Connect these pins directly to the XTAL ground
pins. X1, X2, and the XTAL ground pins must not be connected to
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the PCB ground plane. DO NOT GROUND THE CRYSTAL
GROUND PINS. Refer to the Si5341/40 Family Reference Manual
for layout guidelines. These pins should be left disconnected
when connecting XA/XB pins to an external reference clock.
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Clock Inputs. These pins accept both differential and single-
ended clock signals. Refer 3.3.2 Input Clocks (IN0, IN1, IN2) for
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input termination options. These pins are high-impedance and
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must be terminated externally. If both the INx and INx (with over-
strike) inputs are un-used and powered down, then both inputs
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can be left floating. ClockBuilder Pro will power down an input that
is set as "Unused".
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External Feedback Input. These pins are used as the external
feedback input (FB_IN/FB_INb) for the optional zero delay mode.
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See 3.5.12 Zero Delay Mode for details on the optional zero delay
mode. If FB_IN and FB_IN (with overstrike) are un-used and pow-
ered down, then both inputs can be left floating. ClockBuilder Pro
will power down an input that is set as "Unused".
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