SI5351-B Datasheet, PDF (23/41 Pages) Silicon Laboratories – Supports static phase offset

Si5351A/B/C-B
6. Design Considerations
The Si5351 is a self-contained clock generator that requires very few external components. The following general
guidelines are recommended to ensure optimum performance. Refer to “AN554: Si5350/51 PCB Layout Guide” for
additional layout recommendations.
6.1. Power Supply Decoupling/Filtering
The Si5351 has built-in power supply filtering circuitry and extensive internal Low Drop Out (LDO) voltage
regulators to help minimize the number of external bypass components. All that is recommended is one 0.1 to
1.0 µF decoupling capacitor per power supply pin. This capacitor should be mounted as close to the VDD and
VDDOx pins as possible without using vias.
6.2. Power Supply Sequencing
The VDD and VDDOx (i.e., VDDO0, VDDO1, VDDO2, VDDO3) power supply pins have been separated to allow
flexibility in output signal levels. Power supply sequencing for VDD and VDDOx requires that all VDDOx be
powered up either before or at the same time as VDD. Unused VDDOx pins should be tied to VDD.
6.3. External Crystal
The external crystal should be mounted as close to the pins as possible using short PCB traces. The XA and XB
traces should be kept away from other high-speed signal traces. See “AN551: Crystal Selection Guide” for more
details.
6.4. External Crystal Load Capacitors
The Si5351 provides the option of using internal and external crystal load capacitors. If internal load capacitance is
insufficient, capacitors of value < 2 pF may be used to increased equivalent load capacitance. If external load
capacitors are used, they should be placed as close to the XA/XB pads as possible. See “AN551: Crystal Selection
Guide” for more details.
6.5. Unused Pins
Unused voltage control pin should be tied to GND.
Unused CLKIN pin should be tied to GND.
Unused XA/XB pins should be left floating. Refer to "5.6. Applying a Reference Clock at XTAL Input" on page 21
when using XA as a clock input pin.
Unused output pins (CLK0–CLK7) should be left floating.
Unused VDDOx pins should be tied to VDD.
6.6. Trace Characteristics
The Si5351A/B/C features various output current drive strengths. It is recommended to configure the trace
characteristics as shown in Figure 18 when the default high drive strength is used.
Z_O = 50 ohms
CLK
R = 0 ohms
(Optional resistor for
EMI management)
Figure 18. Recommended Trace Characteristics with Default Drive Strength Setting
Rev. 1.0
23