The HTO57 from Statek Corporation is a General Crystal Oscillator with Frequency 0.032768 MHz / 1.5 MHz to 50 MHz, Supply Voltage 3.3 to 5 V, Output Load 15 pF, Startup Time 5 mS, Duty Cycle 40 to 60 %. Tags: Surface Mount. More details for HTO57 can be seen below.