1 Features

• One Digital Phase-Locked Loop (DPLL) With:

– Hitless Switching: ±50-ps Phase Transient

– Programmable Loop Bandwidth With Fastlock

– Standards-Compliant Synchronization and

Holdover Using a Low-Cost TCXO/OCXO

• Two Analog Phase-Locked Loops (APLLs) With

Industry-Leading Jitter Performance:

– 50-fs RMS Jitter at 312.5 MHz (APLL1)

– 125-fs RMS Jitter at 155.52 MHz (APLL2)

• Two Reference Clock Inputs

– Priority-Based Input Selection

– Digital Holdover on Loss of Reference

• Eight Clock Outputs with Programmable Drivers

– Up to Six Different Output Frequencies

– AC-LVDS, AC-CML, AC-LVPECL, HCSL, and

1.8-V LVCMOS Output Formats

• EEPROM / ROM for Custom Clocks on Power-Up

• Flexible Configuration Options

– 1 Hz (1 PPS) to 800 MHz on Input and Output

– XO/TCXO/OCXO Input: 10 to 100 MHz

– DCO Mode: < 0.001 ppb/Step for Precise Clock

Steering (IEEE 1588 PTP Slave)

– Advanced Clock Monitoring and Status

– I2C or SPI Interface

• PSNR: –83 dBc (50-mVpp Noise on 3.3-V Supply)

• 3.3-V Supply With 1.8-V, 2.5-V, or 3.3-V Outputs

• Industrial Temperature Range: –40 °C to +85 °C

2 Applications

• SyncE (G.8262), SONET/SDH (Stratum 3/3E,

G.813, GR-1244, GR-253), IEEE 1588 PTP Slave

Clock, or Optical Transport Network (G.709)

• 400G Line Cards, Fabric Cards for Ethernet

Switches and Routers

• Wireless Base Station (BTS), Wireless Backhaul

• Test and Measurement, Medical Imaging

• Jitter Cleaning, Wander Attenuation, and

Reference Clock Generation for 56G/112G PAM-4

PHYs, ASICs, FPGAs, SoCs, and Processors

3 Description

The LMK05318B is high-performance network

synchronizer clock device that provides jitter cleaning,

clock generation, advanced clock monitoring, and

superior hitless switching performance to meet the

stringent timing requirements of communications

infrastructure and industrial applications. The ultra-low

jitter and high power supply noise rejection (PSNR)

of the device can reduce bit error rates (BER) in highspeed

serial links.

The device can generate output clocks with 50-fs

RMS jitter using TI's proprietary Bulk Acoustic Wave

(BAW) VCO technology, independent of the jitter and

frequency of the XO and reference inputs.