SI53258A-D03AMR

Clock Buffers, Drivers Overview

The Si53258A-D03AMR is an automotive-grade clock buffer from Skyworks Solutions, featuring eight HCSL outputs and two differential inputs. It supports PCIe Gen1 through Gen6 common clock architectures with a maximum input frequency of 100 MHz. The device operates on a core supply voltage ranging from 1.71 V to 3.46 V and functions within an ambient temperature range of –40 °C to +105 °C. It includes internal termination resistors selectable via the IMP_SEL pin for 85 Ω or 100 Ω line matching. The component is housed in a 40-QFN package and is supplied in tape and reel format.

Clock Buffers, Drivers Feature Summary

• Eight HCSL outputs compliant with PCIe Gen1/2/3/4/5/6 specifications
• Dual-input capability with hardware MUX selection (CLK_SEL)
• Internal impedance matching selectable between 85 Ω and 100 Ω
• Additive jitter performance of 0.013 ps RMS for PCIe Gen 6

Clock Buffers, Drivers Applications

• Automotive infotainment systems
• Advanced Driver Assistance Systems (ADAS) Electronic Control Units (ECU)
• Radar sensor timing distribution
• LiDAR sensor timing distribution

Clock Buffers, Drivers Procurement Notes

Verify that the ordering suffix 'R' corresponds to the tape and reel packaging configuration as specified in the manufacturer's ordering guide. Confirm that the dual-input variant matches the system requirement for CLK_IN1 and CLK_IN2 connectivity. Ensure the design accommodates the 40-QFN footprint and thermal pad requirements for proper operation.

Clock Buffers, Drivers Selection Notes

Select this model when dual independent clock sources are required for redundancy or switching. The IMP_SEL pin must be configured at power-up to match the transmission line impedance (85 Ω or 100 Ω). Unused output drivers should remain unconnected or have their VDDO pins disabled to minimize current consumption. Verify compatibility with the target PCIe generation's jitter budget.

Clock Buffers, Drivers Part Context

This part belongs to the Si5325x family of high-performance PCIe fanout buffers. The Si53258 variant provides eight outputs, whereas the Si53254 provides four. The D03 suffix indicates the inclusion of two clock inputs with a multiplexer, distinguishing it from the single-input D01 variants. All models share similar electrical characteristics and automotive qualifications.

Clock Buffers, Drivers Replacement Considerations

Si53258A-D01AMR offers identical output specifications but lacks the second input clock source and MUX functionality.