SI5351A/B

Part: Si5351A/B/C-B — Skyworks Solutions Type: I2C-Programmable Any-Frequency CMOS Clock Generator + VCXO

Description: The Si5351 is an I2C configurable clock generator capable of generating up to eight non-integer related frequencies from 2.5 kHz to 200 MHz with 0 ppm error, operating from a low-cost 25 or 27 MHz crystal.

Operating Conditions:

• Supply voltage (Core VDD): 2.25–2.75 V or 3–3.6 V
• Supply voltage (Output VDDO): 1.71–1.89 V, 2.25–2.75 V, or 3–3.6 V
• Operating temperature: -40 to 85 °C
• Output frequency range: 2.5 kHz to 200 MHz

Absolute Maximum Ratings:

• Max input voltage (CLKIN, SDA, SCL): 3.6 V

Key Specs:

• Core Supply Current (8 outputs enabled): 27 mA (typ) at VDD = 2.5 V ±10% or 3.3 V ±10%, TA = -40 to 85 °C
• Output Buffer Supply Current (Per Output): 2.2 mA (typ) at CL = 5 pF, output clocks ≤ 100 MHz
• Output Period Jitter (10-MSOP or 20-QFN, all outputs running): 70 ps, pk-pk (typ)
• Output Rise/Fall Time (20%-80%, CL = 5 pF, default high drive strength): 1 ns (typ)
• VCXO Pull Range (Si5351B only, configurable): ±30 to ±240 ppm (VDD = 3.3 V)
• Crystal Frequency: 25–27 MHz
• CLKIN Frequency Range: 10–100 MHz
• I2C Bus Timeout: 25–35 ms

Features:

• Glitchless frequency changes
• Generates up to eight non-integer related frequencies
• I2C user definable configuration
• Exact frequency synthesis at each output (0 ppm error)
• Highly linear VCXO
• Optional clock input (CLKIN)
• Low output period jitter: < 70 ps pp, typ
• Configurable spread spectrum selectable at each output
• Operates from a low-cost, fixed frequency crystal: 25 or 27 MHz
• Supports static phase offset
• Programmable rise/fall time control
• Separate voltage supply pins provide level translation
• Excellent PSRR eliminates external power supply filtering
• Very low power consumption
• Adjustable output delay
• PCIE Gen 1 compatible
• Supports HCSL compatible swing

Applications:

• Audio/video equipment, gaming
• Printers, scanners, projectors
• Handheld Instrumentation
• Laser range finder
• Residential gateways
• Networking/communication
• Servers, storage
• XO replacement

Package:

• 10-MSOP (3 outputs)
• 16-QFN (3x3 mm, 4 outputs)
• 20-QFN (4x4 mm, 8 outputs)

• https://www.skyworksinc.com/Products/Timi ng/CMOS-Clock-Generators
• Glitchless frequency changes
• Generates up to eight non-integerrelated frequencies from 2.5 kHz to 200 MHz
• I 2 C user definable configuration
• Exact frequency synthesis at each output (0 ppm error)
• Highly linear VCXO
• Optional clock input (CLKIN)
• Low output period jitter: < 70 ps pp, typ
• Configurable spread spectrum selectable at each output
• Operates from a low-cost, fixed frequency crystal: 25 or 27 MHz
• Supports static phase offset
• Programmable rise/fall time control

• Audio/video equipment, gaming
• Printers, scanners, projectors
• Handheld Instrumentation
• Laser range finder

Table 3. Recommended Operating Conditions

Notes: All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions. Typical values apply at nominal supply voltages and an operating temperature of 25 °C unless otherwise noted. VDD and VDDOx can be operated at independent voltages.

Power supply sequencing for VDD and VDDOx requires that all VDDOx be powered up either before or at the same time as VDD.

Figure 25 shows the package details for the Si5351 in a 20-QFN package. Table 21 lists the values for the dimensions shown in the illustration.

Figure 25. 20-Pin QFN Package Drawing

Figure 25 shows the package details for the Si5351 in a 20-QFN package. Table 21 lists the values for the dimensions shown in the illustration.

Table 21. Package Dimensions

1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing per ANSI Y14.5M-1994.
3. This drawing conforms to JEDEC Outline MO-220, variation VGGD-5.
4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components.