The LMK3H0102 is a dual-channel clock generator primarily used for PCIe Gen 1 to Gen 6 clock generation, either with or without Spread Spectrum Clocking (SSC). The device has an integrated Bulk Acoustic Wave (BAW) resonator and does not require any external crystal or clock reference. The device has four selectable pages of memory, referred to as OTP pages. The collection of these pages in memory is referred to as the EFUSE.

The default output configuration is two 100-MHz clocks, each with a 100-Ω LP-HCSL output format. The LMK3H0102 supports 100-Ω LP-HCSL, 85-Ω LP-HCSL, LVDS and 1.8-V, 2.5-V, or 3.3-V LVCMOS output formats, as well as programmable output frequencies up to 200 MHz for single-ended outputs and 400 MHz for differential outputs.

The LMK3H0102 supports two functional modes determined by the REF_CTRL pin at power-up: One-Time Programming (OTP) mode or I²C mode.

1. In OTP mode, one out of four OTP pages is selected by pins OTP_SEL0 and OTP_SEL1. The default output frequency across all OTP pages is 100 MHz.
2. In I²C mode, the LMK3H0102 is configured by modifying the active registers. If a configuration other than the default operation is desired, the registers must be written every time at start-up.

   When using a device with a blank EFUSE, the EFUSE can be permanently programmed through the I²C.

The LMK3H0102 has flexible SSC configurations, including:

1. SSC disabled on both outputs
2. SSC enabled on both outputs
3. SSC enabled on a single output