SI5341_16 datasheet(40/53 Pages) SILABS

40 / 53 page

Table 9.1. Pin Descriptions

Pin Name

Pin Number

Pin Type1

Function

Si5341

Si5340

Inputs

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

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".

XTAL Shield. Connect these pins directly to the XTAL ground

pins. X1, X2, and the XTAL ground pins must not be connected to

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.

IN0

Clock Inputs. These pins accept both differential and single-

ended clock signals. Refer 3.3.2 Input Clocks (IN0, IN1, IN2) for

input termination options. These pins are high-impedance and

must be terminated externally. If both the INx and INx (with over-

strike) inputs are un-used and powered down, then both inputs

can be left floating. ClockBuilder Pro will power down an input that

is set as "Unused".

IN0b

IN1

IN1b

IN2

IN2b

FB_IN

External Feedback Input. These pins are used as the external

feedback input (FB_IN/FB_INb) for the optional zero delay mode.

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".

FB_INb

Si5341/40 Rev D Data Sheet

Pin Descriptions

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