Texas Instruments LMKDB12xx LP-HCSL Clock Multiplexers
Texas Instruments LMKDB12xx LP-HCSL Clock Multiplexers are extremely low-jitter clock muxes for PCIe clocking applications from PCIe Gen 1 to PCIe Gen 7. The series includes the LMKDB1202, LMKDB1204, and LMKDB1208 devices and supports common clock and independent reference PCIe architectures with input clocks that use or do not use spread-spectrum clocking.
The TI LMKDB12xx multiplexers are DB2000QL compliant and provide built-in features for robust clock distribution, including fail-safe inputs, flexible power-up sequencing, individual output enable, automatic output disable, and loss-of-signal input detection. The LMKDB12xx LP-HCSL Clock Multiplexers also include an SBI sideband interface for high-speed control of output enable/disable.
The clock multiplexers are excellent for high-performance computing, server motherboards, NICs, SmartNICs, and hardware accelerators. The LMKDB12xx supports 1.8V and 3.3V power rails and is available in 20-pin, 28-pin, and 48-pin VQFN package options.
Features
- LP-HCSL clock mux support for PCIe Gen 1 to Gen 7 systems
- DB2000QL compliance across all devices
- Low additive jitter performance
- 31fs maximum RMS additive jitter from 12kHz to 20MHz at 156.25MHz
- 13fs maximum additive jitter for PCIe Gen 4
- 5fs maximum additive jitter for PCIe Gen 5
- 3fs maximum additive jitter for PCIe Gen 6
- 2.1fs maximum additive jitter for PCIe Gen 7
- Support for common clock and independent reference PCIe architectures
- Input clock operation with or without spread-spectrum clocking
- Fail-safe input and flexible power-up sequence support
- Automatic output disable, and individual output enable features
- SBI side-band interface for high-speed output enable or disable control
- LOS input detection for loss-of-signal monitoring
Applications
- High-performance computing
- Server motherboard
- NIC/SmartNIC
- Hardware accelerator
Specifications
- Package options
- LMKDB1208 RSL 48-pin VQFN package, 6mm x 6mm
- LMKDB1204 REX 28-pin VQFN package, 4mm x 4mm
- LMKDB1202 REY 20-pin VQFN package, 3mm x 3mm
- Output impedance options of 85Ω or 100Ω
- Power supply support of 1.8V or 3.3V ±10%
- Ambient temperature range of -40°C to +105°C
Eval Modules
Texas Instruments LMKDB1204EVM 评估模块（EVM）
设计用于评估支持PCIe Gen 1至Gen 6的LMKDB1204 LP-HCSL缓冲器。
Texas Instruments LMKDB1x02EVM 评估模块
旨在快速演示LMKDB1x02 LP-HCSL缓冲器，它支持1至6代PCIe。
Associated Buffers
Texas Instruments LMKDB1超低抖动时钟缓冲器
LP-HCSL缓冲器和MUX，支持PCIe Gen 1至Gen 6，符合DB2000QL标准。
Additional Resources
Typical Application
