I want to experiment with the SoC but I can't seem to be able to find it anywhere, not even documentation or anything else.
PS. Are there alternatives available from Broadcom?
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Broadcom does not do business with "small fish". Their MOQ tend to be hundreds of thousands of chips. Furthermore, the Bluetooth/WiFi on WiFi-enabled Raspberries is a seperate chip (BCM43438) which is now being made by Cypress.
That is why the BCM43438 is now known as CYW43438.
A detailed datasheet can be found here.