Table 6.2. Si5332 Pin Descriptions (40-Pin)
Pin Number
Pin Name
Pin Type
Function
1
VDD_DIG
P
Voltage supply for digital functions. Connect to 1.8–3.3 V. Part of internal
core VDD voltage. Must be connected to same voltage as VDDA and
VDD_XTAL.
2
CLKIN_2
I
These pins accept both differential and single-ended clock signals. Refer
to Section
for input termination options. These pins are
high-impedance and must be terminated externally. If both the CLKIN_2
and CLKIN_2b 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".
3
CLKIN_2b
I
4
VDD_XTAL
P
Voltage supply for crystal oscillator. Connect to 1.8–3.3 V. Part of internal
core VDD voltage. Must be connected to same voltage as VDDA and
VDD_DIG.
5
XA/CLKIN1
I or P
Si5332A/B/C/D:
These pins are used for an optional XTAL input when operating the device
in asynchronous mode (i.e. free-run mode). Refer to Section
for recommended crystal specifications.
Si5332E/F/G/H/L (Embedded Crystal)
No Connect. Do not connect pins 5 or 6 to anything.
6
XB
I or P
7
CLKIN_3
I
These pins accept both differential and single-ended clock signals. Refer
to Section
for input termination options. These pins are
high-impedance and must be terminated externally. If both the CLKIN_3
and CLKIN_3b 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".
8
CLKIN_3b
I
9
VDDA
P
Core Supply Voltage. Connect to 1.8–3.3 V.
See the
Si5332 Family Reference Manual
for power supply filtering recom-
mendations.
Must be connected to same voltage as VDD_DIG and VDD_XTAL.
10
INPUT1
I
Universal HW Input pin. This hardware input pin is user definable through
ClockBuilder Pro. Refer to Section
3.7 Universal Hardware Input Pins
for a
list of definitions that hardware input pins can be used for.
11
SCLK
I
Serial Clock Input
This pin functions as the serial clock input for I
2
C.
SCLK is a digital input internally referenced to VDD_DIG. SCLK must have
an external pull-up resistor (I
2
C bus pull-up) to same voltage as VDD_DIG.
12
SDA
I/O
Serial Data Interface
This is the bidirectional data pin (SDA) for the I
2
C mode.
SDA is a digital open-drain bi-directional internally referenced to VDD_DIG.
SDA must have an external pull-up resistor (I
2
C bus pull-up) to same volt-
age as VDD_DIG.
Si5332 Data Sheet • Pin Descriptions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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Rev. 1.3 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 16, 2021
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