# Clock frequency generator module, I2C, CJMCU-5351, 3-5V, 8KHz-160MHz

> CJMCU-5351 clock frequency generator module with MS5351M IC, controlled via I2C (address 0x60). Operates at 3-5V DC and generates frequencies from 8kHz to 160MHz. Provides three independent 3Vpp outputs, configurable through PLLs and dividers, with 100ps pp jitter and 0 ppm frequency error. Compatible with breadboard pins or an optional SMA connector for RF use.

- Page: https://sigmanortec.ro/en/clock-frequency-generator-module-i2c-cjmcu-5351-3-5v-8khz-160mhz
- Price: 22.36 RON
- Availability: In stock; 1-2 zile
- Reference: 9720 · EAN: 5945327098758
- Category: Mechatronics and IoT > PWM and Frequency generators
- Specifications: Input Voltage: 3 - 5 V; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.
- Package (shipping data): 0.009 kg
- Updated: 2026-09-23
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 04:49 (Europe/Bucharest)

## Description

I2C controlled clock generator, ideal for prototyping and synchronization in microcontroller projects. It offers three independent outputs with different frequencies, covers 8 kHz-160 MHz, operates at 3-5 V and allows precise settings via PLL and dividers for stable and flexible signals.
The CJMCU-5351 module, with the MS5351M IC, is an I2C-controlled clock signal generator, using a precision clock to drive multiple PLLs and clock dividers via I2C commands.
This module is extremely versatile, allowing the creation of precise and arbitrary frequencies by configuring PLLs and dividers.
It has three independent outputs, each capable of a different frequency. The outputs are 3Vpp and can be used either through breadboard compatible connectors or, for RF work, through an optional SMA connector.
Specifications:
Operating and Logic Voltage: 3V - 5VDC
IC: MS5351M
Interface: I2C
I2C address: 0x60
Generable Frequencies: 8 kHz to 160 MHz
Configuration: User definable via I2C
Frequency Accuracy: 0 ppm error
VCXO: Very linear
Optional Clock Input (CLKIN)
Output Period Jitter: 100 ps pp
Crystal: 25 or 27 MHz
Supports phase offset: static
Programmable Time Control: Rise/Fall
Frequency Changes: Glitch-free
Pinout:
VIN – Power input for the module (3V – 5V DC), connected to the system voltage source.
GND – Ground reference, connects to the common ground of the circuit.
SCL – Clock line for I2C communication with the microcontroller.
SDA – Data line for configuring the module via I2C.
D0 (CLK0) – Programmable clock signal output. Square wave signal with user-defined frequency.
D1 (CLK1) – Second independent clock output. Configurable separately.
D2 (CLK2) – Third clock output. Useful for multi-frequency applications.
Use:
Power the module with a 3V - 5V DC source.
Connect the module to the desired microcontroller or digital system using the I2C interface.
Configure PLLs and dividers via I2C to generate the desired frequencies.
Use the available outputs for your application, either directly through the header or through an SMA connector for RF work.