SI52112-B3ZM21R

Overview

The SI52112-B3ZM21R is a dual-output PCIe clock generator from Skyworks Solutions, compliant with PCI-Express Gen 1 and Gen 2 specifications. It sources two differential HCSL clocks from a 25 MHz crystal or clock input, operating at a maximum frequency of 100 MHz. The device features low power consumption (17 mA typical) and requires no termination resistors. It operates on a 3.3 V supply within an extended temperature range of –40 to +85 °C. This specific part number utilizes a 10-pin TDFN package (3x3 mm) manufactured by UTAC and does not support spread spectrum outputs.

Feature Summary

• Dual-output HCSL differential clock buffers compliant with PCIe Gen 1 and Gen 2 standards
• Accepts 25 MHz crystal or clock input for generating up to 100 MHz output frequencies
• Low power operation with a typical supply current of 17 mA at 3.3 V
• No external termination resistors required for the differential outputs

Applications

• Network Attached Storage (NAS)
• Multi-function Printers
• Wireless Access Points
• Routers

Procurement Notes

Verify that the 'ZM21' suffix specifically indicates assembly by UTAC, as this affects manufacturing origin but not electrical function. Confirm the tape and reel packaging format ('R') matches automated placement requirements. Ensure the non-spread spectrum characteristic aligns with system EMI management strategies, as the B3 variant lacks the modulation features found in the B4 series.

Selection Notes

Select the SI52112-B3ZM21R when PCIe Gen 1 or Gen 2 compliance is required without spread spectrum modulation. Choose this over the B4 variant if deterministic jitter without frequency spreading is preferred. Verify compatibility with the 10-pin TDFN footprint (3x3 mm). For applications requiring spread spectrum, consider the SI52112-B4 series instead.

Part Context

This component belongs to the Si52112-B3/B4 family of dual-output PCIe clock generators. The base Si52112-B3 provides fixed-frequency outputs, whereas the Si52112-B4 adds 0.5% down-spread capability. The ZM21 ordering suffix denotes a specific 10-pin TDFN package configuration assembled by UTAC, distinguishing it from standard GM2 or GT packages.

Replacement Considerations

The SI52112-B3-GM2 serves as a direct functional substitute with identical electrical characteristics but differs in package supplier and tube packaging. The SI52112-B4 series offers similar performance but includes 0.5% spread spectrum functionality.