Si5351A/B/C

Table 7. I2C Specifications (SCL,SDA)1

Parameter

Symbol

Test Condition

Standard Mode

Fast Mode

 

Unit

 

 

 

 

 

100 kbps

400 kbps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Min

Max

Min

 

Max

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOW Level

VILI2C

 

 

 

–0.5

0.3 x VDDI2

–0.5

 

0.3 x VDDI2C

2

V

Input Voltage

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

HIGH Level

VIHI2C

 

 

 

0.7 x VDDI2

3.63

0.7 x VDDI2C

2

3.63

 

V

Input Voltage

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hysteresis of

 

 

 

 

0.1

 

 

V

Schmitt Trigger

VHYS

 

 

 

 

 

Inputs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOW Level

 

VDDI2C2 = 2.5/3.3 V

0

0.4

0

 

0.4

 

V

Output Voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(open drain or

VOLI2C2

 

 

 

 

 

 

 

 

 

 

open collector)

VDDI2C

2

= 1.8 V

0

 

0.2 x VDDI2C

V

at 3 mA Sink

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Current

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Current

III2C

 

 

 

–10

10

–10

 

10

 

µA

Capacitance for

CII2C

VIN = –0.1 to VDDI2C

4

 

4

 

pF

Each I/O Pin

 

 

I2C Bus

TTO

Timeout Enabled

25

35

25

 

35

 

ms

Timeout

 

 

Notes:

 

 

 

 

 

 

 

 

 

 

 

1. Refer to NXP’s UM10204 I2C-bus specification and user manual, revision 03, for further details, go to: www.nxp.com/acrobat_download/usermanuals/UM10204_3.pdf.

2. Only I2C pullup voltages (VDDI2C) of 2.25 to 3.63 V are supported.

Table 8. Thermal Characteristics

Parameter

Symbol

Test Condition

Package

Value

Unit

 

 

 

 

 

 

 

 

 

10-MSOP

131

°C/W

Thermal Resistance

θJA

 

 

 

 

Still Air

24-QSOP

80

°C/W

Junction to Ambient

 

 

 

20-QFN

51

°C/W

 

 

 

 

 

 

 

 

 

10-MSOP

43

°C/W

Thermal Resistance

θJC

 

 

 

 

Still Air

24-QSOP

31

°C/W

Junction to Case

 

 

 

20-QFN

16

°C/W

 

 

 

 

 

 

Preliminary Rev. 0.95

7

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Silicon Laboratories SI5351A/B/C specifications I2C Specifications SCL,SDA1, Thermal Characteristics

SI5351A/B/C specifications

Silicon Laboratories SI5351A/B/C is a versatile, low-power clock generator and frequency synthesizer that has gained widespread popularity in various applications, including telecommunications, consumer electronics, and industrial control systems. These devices are primarily designed to provide precise clock frequency generation with low phase noise and jitter, making them ideal for high-performance applications.

One of the standout features of the SI5351 is its ability to generate multiple output frequencies simultaneously. Capable of producing up to three independent programmable outputs, the SI5351A/B/C can generate frequencies ranging from 8 kHz to 160 MHz. With its integrated phase-locked loop (PLL) technology, it achieves excellent frequency stability and accuracy, simplifying the design of frequency-dependent systems.

The device operates under a supply voltage range of 1.8V to 3.6V, allowing it to be used in battery-powered applications without excessive power consumption. The SI5351’s low current draw, typically as low as 25 mA, is especially beneficial in portable devices, extending battery life and enhancing overall efficiency. Furthermore, it features a programmable output driver, which can be set to various drive strengths, ensuring compatibility with a wide array of load requirements.

Configuration and control of the SI5351 are user-friendly, implemented via an I2C interface. This allows for straightforward integration into microcontroller-based designs. Moreover, the device includes an on-chip memory that stores settings, which streamlines the reconfiguration process when power cycling, minimizing setup time for developers.

Another significant advantage of the SI5351A/B/C is its output jitter performance, which is typically below 1 ps, resulting in clean output signals essential for high-speed data communications and precise timing applications. The SI5351’s integration of multiple synthesizer stages contributes to its impressive phase noise characteristics, making it suitable for demanding RF applications.

Additionally, the SI5351 devices offer programmable frequency stepping, allowing users to define custom frequency increments, which is particularly useful in applications requiring precise tuning or modulation. This flexibility, combined with its compact size and simple interface, makes the SI5351A/B/C an ideal choice for engineers seeking a reliable, cost-effective solution for generating clock signals in a myriad of electronic systems.

In summary, Silicon Laboratories SI5351A/B/C provides a robust, low-power solution for high-precision clock generation, characterized by its programmable outputs, low jitter, easy configurability, and broad frequency range, making it an excellent choice for both commercial and industrial applications across various sectors.