SL18861DI

Clock Buffers, Drivers Overview

The SL18861DI is a high-performance 3-output clock distribution buffer manufactured by Silicon Laboratories. It provides three single-ended LVCMOS outputs from a single input clock using proprietary low phase noise and low power dissipation circuit design. The device operates on a single power supply ranging from 1.70V to 3.65V, with typical current consumption of 2.7mA at 1.8V. It supports an input clock frequency range of 10MHz to 52MHz for both LVCMOS square wave and sine wave inputs. Each output features individual enable control (OE1/2/3) to reduce power consumption when connected devices are inactive.

Clock Buffers, Drivers Feature Summary

• Ultra-low phase noise performance: -140 dBc/Hz at 1 kHz offset (1.8V)
• Low current consumption: Typical 2.7mA operating current at 1.8V
• Individual output enable pins (OE1/2/3) for power management
• Supports LVCMOS or Sine wave inputs in the 10MHz to 52MHz range

Clock Buffers, Drivers Applications

• Smart Mobile Handsets
• Multi-mode RF Clock Distribution
• Baseband Peripheral Clock Distribution
• WLAN, Bluetooth, and DVB-H input clock reference

Clock Buffers, Drivers Procurement Notes

Verify package type upon ordering; the standard SL18861DI ships in a tube, while the SL18861DIT variant uses tape and reel packaging. Both options utilize the same 10-pin TDFN package and industrial temperature range (-40°C to 85°C). Confirm RoHS compliance status as per manufacturer specifications.

Clock Buffers, Drivers Selection Notes

Select based on required supply voltage within the 1.70V to 3.65V range. Ensure load capacitance requirements do not exceed 20pF (typical) or 25pF (max at 3.3V). Verify that input signal levels match LVCMOS thresholds or sine wave swing requirements for the chosen VDD.

Clock Buffers, Drivers Part Context

This component belongs to the Silicon Laboratories clock distribution buffer family. It is designed to isolate devices driven by clock outputs to minimize interference between them. The device integrates control logic to manage output states and includes an OE_OSC pin to enable external TCXO/XO oscillators when all outputs are disabled.

Clock Buffers, Drivers Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Evaluate alternatives based on matching 3-channel LVCMOS output configuration, 10-52MHz frequency range, and 10-pin TDFN package dimensions.

Clock Buffers, Drivers FAQ

How are the CLKOUT1, CLKOUT2, and CLKOUT3 outputs controlled?

Each output has a dedicated enable pin (OE1, OE2, OE3). When the respective OE pin is high, the output is active; when low, the output enters a Hi-Z state.

What is the function of the OE_OSC pin?

The OE_OSC pin enables an external TCXO/XO. It goes low only when OE1, OE2, and OE3 are all low; otherwise, it remains high.

What is the maximum load capacitance supported by the outputs?

The typical load capacitance is 10pF, with a maximum rating of 20pF at 1.8V/2.5V and 25pF at 3.3V.