3.3 40 MHz (System) Reference Clock Connectivity

In the case when the Master chip sources the reference clock for the other Slave devices, the OSC_CLKOUT [A14] pin of the Master is used. OSC_CLKOUT feeds into the CLKP [E14] pin of the Slave chips. The OSC_CLKOUT signal is an approximately 1.3 V to ground square wave output. It can be dc-coupled or ac-coupled to the CLKP pin of Slave chip. The max input level at CLKP is 1.8 V when dc-coupled and 1.2 Vpp when ac-coupled.

When more than two chips are cascaded, it is recommended to use a clock fan-out buffer to generate the clocks for Slave devices.