6. Pin Description

6

5

4

1

2

3

VSS

SSCLK2/SSONb/PD/

OE

SSCLK1/REFCLK

FSEL/SSONb/OE

VDD

XOUT

XIN/CLKIN

Si51210

Figure 6.1. 6-Pin TDFN

Table 6.1. Si51210 6-Pin Descriptions

Pin #

Name

Type

Description

1

VDD

PWR

2.5 to 3.3 V power supply.

2

XIN/CLKIN

I

External crystal and clock input.

3

XOUT

O

Crystal output. Leave this pin unconnected (floating) if an external

clock input is used.

4

SSCLK1/REFCLK/FSEL/SSONb/OE

I/O

Programmable SSCLK1 or REFCLK output or MultiFunction con-

trol input. The frequency at this pin is synthesized by the inter-

nal PLL if programmed as SSCLK1 with or without spread. If

programmed as REFCLK, the output clock is a buffered output of

crystal or reference clock input. If programmed as a MultiFunction

control input, it can be OE, FSEL, and SSONb.

5

SSCLK2/OE/SSONb/PD

I/O

Programmable SSCLK2 output or MultiFunction control input. The

frequency at this pin is synthesized by the internal PLL if program-

med as SSCLK2 with or without spread. SSCLK2 output can also

be programmed as a buffered output of crystal or reference clock

input divided by N, 2 < N < 8. If programmed as a MultiFunction

control input, it can be OE, PD, and SSONb. This pin cannot be

programmed as FSEL control input.

6

VSS

GND

Ground.

Si51210 Data Sheet • Pin Description

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 23, 2021

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