Datasheet

Si5351A/B/C-B
26 Rev. 1.0
9.2. Si5351B 20-Pin QFN
Figure 20. Si5351B 20-QFN Top View*
Table 12. Si5351B Pin Descriptions
Pin Name
Pin
Number
Pin Type
1
Function
XA 1 I Input pin for external crystal
XB 2 I Input pin for external crystal
CLK0 13 O Output clock 0
CLK1 12 O Output clock 1
CLK2 9 O Output clock 2
CLK3 8 O Output clock 3
CLK4 19 O Output clock 4
CLK5 17 O Output clock 5
CLK6 16 O Output clock 6
CLK7 15 O Output clock 7
VC 3 I VCXO control voltage input
SCL 4 I I
2
C bus serial clock input. Pull-up to VDD core with 1 k
SDA 5 I/O I
2
C bus serial data input. Pull-up to VDD core with 1 k
SSEN 6 I Spread spectrum enable. High = enabled, Low = disabled.
OEB 7 I Output driver enable. Low = enabled, High = disabled.
VDD 20 P Core voltage supply pin
VDDOA 11 P Output voltage supply pin for CLK0 and CLK1. See 6.2
VDDOB 10 P Output voltage supply pin for CLK2 and CLK3. See 6.2
VDDOC 18 P Output voltage supply pin for CLK4 and CLK5. See 6.2
VDDOD 14 P Output voltage supply pin for CLK6 and CLK7. See 6.2
GND Center Pad P Ground
1. I = Input, O = Output, P = Power
2. Input pins are not internally pulled up.
1
2
3
4
5
6
7
8
9
10
15
14
13
12
11
20
19
18
17
16
XA
XB
VC
SCL
SDA
OEB
CLK3
CLK2
VDDOB
SSEN
GND
PAD
CLK6
CLK5
VDDOC
CLK4
VDD
VDDOA
CLK1
CLK0
VDDOD
CLK7