JAJS245G August 2007 – January 2024 CDCE949 , CDCEL949
PRODUCTION DATA
Figure 7-3 shows how the CDCEx949 clock synthesizer is connected to the SDA/SCL serial interface bus. Multiple devices can be connected to the bus but the speed may need to be reduced (400 kHz is the maximum) if many devices are connected.
Note that the pullup resistor value (RP) depends on the supply voltage, bus capacitance and number of connected devices. The recommended pullup value is 4.7 kΩ. The value must meet the minimum sink current of 3 mA at VOLmax = 0.4 V for the output stages (for more details, see SMBus or I2C Bus specification).