1 Features

• Integrated BAW resonator, no need for external

reference

• Flexible frequency generation:

– Two channel dividers: up to three unique output

frequencies from 2.5 MHz to 400 MHz

– LVCMOS outputs supported up to 200 MHz: 1.8

V, 2.5 V, or 3.3 V

– 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: ±25 ppm

• 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

– PCIe Gen 3 Common Clock jitter: 140 fs

maximum (PCIe limit is 1 ps)

– PCIe Gen 4 Common Clock jitter: 140 fs

maximum (PCIe limit is 500 fs)

– PCIe Gen 5 Common Clock jitter: 45 fs

maximum (PCIe limit is 150 fs)

– PCIe Gen 6 Common Clock jitter: 45 fs

maximum (PCIe limit is 100 fs)

• Mixed SSC and non-SSC output modes

supported, all PCIe Gen 1 to Gen 6 compliant

– 2x SSC outputs, 2x non-SSC outputs, or 1x

SSC output and 1x non-SSC output

• 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

• VDD = VDDO = 1.8 V / 2.5 V / 3.3 V ± 5

• As low as 60 mA current consumption when both

outputs are LP-HCSL

• Internal LDOs with –93.1 dBc PSNR at 500 kHz

switching noise for LP-HCSL outputs

• Start-up time: <5 ms

• Output-to-output skew: <50 ps

• Fail-safe input and VDD pins

2 Applications

• PCIe Gen 1 to Gen 6 clock generation

• Server Motherboard

• NIC, SmartNIC

• Hardware Accelerator

• PCIe SSD

• Add-In Card, PCIe Expansion Card

• Multifunction Printer

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 ±25-ppm

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 (SNRS), 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.