In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Chris Savage wrote:

Kramer,

   You're right, the TTL Oscillator is designed for 5V, but for 3.3V operation you could use a 75 MHz crystal instead, or for 5V, most applications doing this employ at least some passive cooling for the SX48 (see the XGS).  I hope this helps.

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