SI5356A Datasheet, PDF (20/29 Pages) Silicon Laboratories – IC PROGRAMMABLE, ANY-FREQUENCY 1–200 MHZ, QUAD FREQUENCY 8-OUTPUT CLOCK GENERATOR

Si5356A
5. Pin Descriptions
Top View
24 23 22 21 20 19
XA 1
18 _CLK2
XB 2
17 _CLK3
I2C_LSB ³
CLKIN 4
GGNNDD
16 _VDDOB
15 _VDDOC
SSC_DIS ⁵
14 _CLK4
OEB ⁶
13 _CLK5
7 8 9 10 11 12
Note: Center pad must be tied to GND for normal operation.
Table 8. Si5356 Pin Descriptions
Pin # Pin Name I/O
Description
1
XA
I ^{External Crystal.}
If a 25 or 27 MHz crystal is used as the device frequency reference, connect it across
XA and XB. If no input clock is used, this pin should be tied to GND.
2
XB
I ^{External Crystal.}
If a 25 or 27 MHz crystal is used as the device frequency reference, connect it across
XA and XB. If no input clock is used, this pin should be tied to GND.
3 I2C_LSB I _I²_{C LSB Address Bit (3.3 V Tolerant).}
This pin is the least significant bit of the Si5356 I²C address allowing up to two Si5356
devices to occupy the same I²C bus.
4
CLKIN
I Single-Ended Input Clock.
If a single-ended clock is used as the device frequency reference, connect it to this pin.
This pin functions as a high-impedance input for CMOS clock signals. The input should
be dc coupled. If a crystal is used as the device frequency reference, this pin should be
tied to GND.
20
Rev. 1.3