GTL2009PW,118

Specialized Overview

The GTL2009 is a 3-bit Gunning Transceiver Logic (GTL) Front-Side Bus frequency comparator designed for dual Intel Xeon processor platforms. It compares FSB frequency settings from two processors and sets the common bus frequency to the lowest setting when both slots are occupied, or uses the single occupied slot's setting otherwise. The device operates with a supply voltage range of 3.0 V to 3.6 V and accepts GTL inputs at VTT levels of 1.1 V or 1.2 V. Upon power-up, it defaults to a 100 MHz frequency until valid GTL inputs are detected. Propagation delays for the BI to BO path range from 2.3 ns to 30 ns depending on load conditions.

Specialized Feature Summary

• Compares 3-bit GTL frequency inputs to determine the lowest common bus frequency for dual-processor systems
• Provides LVTTL outputs indicating frequency comparison results and slot occupancy status
• Features high ESD protection exceeding 2000 V HBM and latch-up resistance per JEDEC standards

Specialized Applications

• Nocona and Dempsey/Blackford dual Intel Xeon processor platforms
• Front-Side Bus frequency synchronization in multi-processor motherboards
• System health management logic for processor slot detection

Specialized Procurement Notes

Verify the component authenticity by checking the top-side marking 'GTL2009' against the datasheet specifications. Confirm the package type is TSSOP16 (SOT403-1) with a body width of 4.4 mm. Ensure the ordering code suffix matches the required variant, as the source indicates specific endings for standard orientation. Cross-reference the manufacturer part number with official NXP or Philips Semiconductor documentation to confirm current production status and availability.

Specialized Selection Notes

Select this component for designs requiring automatic FSB frequency negotiation between two GTL-based processors. Ensure the system supports the specified 3.0 V to 3.6 V VDD range and compatible VTT termination voltages of 1.1 V or 1.2 V. Verify that the application does not require 5 V tolerant LVTTL I/O, as the device is explicitly noted as non-tolerant. Consider companion chips like the GTL2006 or GTL2007 if additional platform health management or error output disabling functions are needed.

Specialized Part Context

The GTL2009 serves as a specialized interface bridge within legacy server architectures, specifically supporting the transition era of Intel Xeon processors utilizing GTL signaling. It complements other platform management devices like the GTL2006 and GTL2007 to ensure stable communication between dual-socket configurations. This component addresses the need for hardware-level frequency arbitration without software intervention during the boot sequence.

Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult the most recent NXP Semiconductors product selection guide or contact technical support directly for form-fit-function compatible alternatives if the GTL2009 is discontinued or unavailable.