What this silicon oscillator does for your clock tree
The LTC1799IS5#TRMPBF is a silicon oscillator that generates a square-wave clock from 1 kHz to 33 MHz, programmed by a single external resistor — no crystal, no ceramic resonator, no external tuning components beyond the resistor and a bypass cap.
Typical supply current is 7 mA across the frequency range, which keeps the thermal budget low even in the TSOT-23-5 package — no heatsinking needed, but the small pad means the copper pour under the part should be solid and connected to the ground plane with a few vias to pull heat away. The TSOT-23-5 footprint is 0.95 mm pitch, thin profile at 1 mm max height — it fits under a low-profile shield can or on the back side of a dense PCB where a crystal can would not clear.