1 Features

? Integrated BAW resonator, no need for external

reference

? Flexible frequency generation:

– Two channel dividers: up to three unique output

frequencies from 2.5MHz to 400MHz

– LVCMOS outputs supported up to 200MHz:

1.8V, 2.5V, or 3.3V

– Combination of AC-LVDS, DC-LVDS, LP-HCSL,

and LVCMOS on OUT0 and OUT1 pins

– Additional LVCMOS output for generation of up

to 5 LVCMOS clocks

? Total output frequency stability: ±25ppm

? 2 functional modes: I2C or preprogrammed OTP

– Fully configurable I2C address

? Ambient temperature: –40°C to 85°C

? PCIe Gen 1 to Gen 6 compliant: Common Clock

with or without SSC, SRNS, and SRIS

? Very low PCIe jitter with SSC:

– PCIe Gen 3 Common Clock jitter: 135.3fs

maximum (PCIe limit is 1ps)

– PCIe Gen 4 Common Clock jitter: 135.3fs

maximum (PCIe limit is 500fs)

– PCIe Gen 5 Common Clock jitter: 57.5fs

maximum (PCIe limit is 150fs)

– PCIe Gen 6 Common Clock jitter: 34.5fs

maximum (PCIe limit is 100fs)

? Programmable SSC modulation depth

– Preprogrammed: –0.1%, –0.25%, –0.3%, and –

0.5% down spread

– Register programmable: –0.1% to –3% down

spread or ±0.05% to ±1.5% center spread

? 1.8V to 3.3V supply voltage

? Internal LDOs with –93.1dBc PSNR at 500kHz

switching noise for LP-HCSL outputs

? Start-up time: <1.5ms

? Output-to-output skew: <50ps

? Fail-safe digital input pins

2 Applications

? PCIe Gen 1 to Gen 6 clock generation

? Server Motherboard

? NIC, SmartNIC

? Hardware Accelerator

? Multifunction Printer

? PCIe SSD

? Add-In Card, PCIe Expansion Card

3 Description

The LMK3H0102 is a 2-output PCIe Gen 1 to

Gen 6 compliant reference-less clock generator

with Spread Spectrum Clocking (SSC) support.

The part is based on TI proprietary Bulk Acoustic

Wave (BAW) technology and provides ±25ppm

clock outputs without any crystal or external clock

reference. The device can provide two SSC clocks,

two non-SSC clocks, or one SSC clock and one

non-SSC clock at the same time. The device

meets the full PCIe compliance from Gen 1 to

Gen 6, including Common Clock with or without

SSC, Separate Reference No Spread (SRNS), and

Separate Reference Independent Spread (SRIS).

The device can be easily configured through either

GPIO pins or I2C interface. An external DC/DC can

be used to power the device. Refer to Power Supply

Recommendations for detailed guidelines on power

supply filtering and sourcing from DC/DC.