8.4.1 SDA/SCL Hardware InterfaceFigure 7 shows how the CDCE913/CDCEL913 clock synthesizer is connected to the SDA/SCL serial interfacebus. Multiple devices can be connected to the bus, but it may be necessary to reduce the speed (400 kHz is themaximum) if many devices are connected.Note that the pullup resistors (RP) depend on the supply voltage, bus capacitance, and number of connecteddevices. The recommended pullup value is 4.7 kΩ. It must meet the minimum sink current of 3 mA atVOLmax = 0.4 V for the output stages (for more details see the SMBus or I2C Bus specification).