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.