SN65LVDS18DRFR

Overview

The SN65LVDS18DRFT is a high-frequency oscillator gain stage and buffer manufactured by Texas Instruments. It operates on a single 2.5-V or 3.3-V supply voltage and accepts a low-voltage PECL single-ended input. The device provides differential LVDS outputs with a typical differential output voltage magnitude of 340 mV. It supports clock rates up to 1 GHz, featuring a propagation delay time of 460 ps (typical) from the D to Y/Z terminals. The part is housed in an 8-pin WSON package measuring 2 mm x 2 mm and is characterized for operation over a temperature range of -40°C to 85°C.

Feature Summary

• Provides oscillator signal amplification and buffering for high-speed clock distribution networks.
• Features a dedicated Gain Control (GC) pin allowing adjustable Q output voltage levels between 300 mV and 860 mV.
• Includes an internal voltage reference (VBB) typically set at VCC minus 1.35 V to facilitate receiving single-ended PECL input signals.

Applications

• Clock signal amplification and buffering in high-speed digital systems.
• PECL-to-LVDS translation for interfacing different logic families.
• Oscillator gain stages in communication equipment requiring low jitter performance.

Procurement Notes

Verify the specific ordering suffix DRFT against current TI documentation to confirm the 250-unit small tape-and-reel packaging configuration. Ensure that the active status aligns with current production data sheets before finalizing procurement plans.

Selection Notes

Select this component when a single-ended PECL input must be converted to differential LVDS outputs within a 2.5-V or 3.3-V system. Consider the 2-mm x 2-mm WSON package constraints and the requirement for a GC pin connection if variable Q output amplitude is necessary for the design.

Part Context

This device belongs to the SN65LVx18 family of oscillator gain stages. It shares architectural similarities with the SN65LVDS19, which utilizes fully differential inputs instead of single-ended inputs. Both variants are designed for high-frequency applications requiring precise timing characteristics.

Replacement Considerations

SN65LVDS19DRFT serves as a functional alternative for designs requiring fully differential inputs rather than single-ended inputs. SN65LVP18DRFT is suitable for applications requiring LVPECL outputs instead of LVDS outputs.

FAQ

How does the Gain Control (GC) pin affect the Q output?

The GC pin allows control of the Q output voltage. Tying it to GND results in approximately 300 mV, leaving it open defaults to 575 mV, and tying it to VCC yields approximately 860 mV.

What is the purpose of the VBB pin?

The VBB pin provides a voltage reference, typically VCC minus 1.35 V, used internally to receive single-ended PECL input signals. If not needed, it should be left unconnected.

Does the SN65LVDS18 support differential inputs?

No, the SN65LVDS18 is designed specifically for single-ended inputs. For differential input requirements, the SN65LVDS19 variant should be selected.