NXP Semiconductors GTL2008PW,118

Overview

GTL2008PW,118 from NXP Semiconductors is a 12-bit GTL-to-LVTTL translator with dual enable control (EN1/EN2), designed for signal translation between dual Xeon processors, Platform Health Management, South Bridge, and power supply circuits. It operates at 3.0–3.6 V, supports GTL/GTL+/GTL− signaling, and features high-impedance outputs during power-up via synchronized EN1/EN2 logic. Used in server motherboard health monitoring subsystems.

For engineers reviewing the GTL2008PW,118 datasheet, GTL2008PW,118 pinout, GTL2008PW,118 application, or GTL2008PW,118 equivalent, key selection criteria include its dual-power-good-controlled high-Z output behavior, GTL reference voltage range (0.64–1.1 V), open-drain LVTTL I/O with 30 Ω series termination, propagation delays as low as 1 ns (tPLH), and TSSOP28 package compatibility with Xeon platform timing constraints.

Technical Context

The GTL2008PW,118 implements bidirectional GTL/LVTTL translation with asymmetric enable architecture: EN1 controls 1AO/2AO/5A and disconnects 1BI/2BI/5BI; EN2 controls 3AO/4AO/6A and disconnects 3BI/4BI/6BI. Its 11BO output is actively driven LOW on power-up when EN2 is LOW to prevent false fault reporting.

It supports GTL input thresholds referenced to VREF (0.64–1.1 V) and LVTTL inputs with VIH ≥2 V / VIL ≤0.8 V. All GTL outputs (e.g., 7BO1, 10BO1) are push-pull, while LVTTL outputs (1AO–4AO, 5A, 6A, 9AO, 11A) are open-drain - requiring external pull-ups per application guidance.

Key Specifications

Pinout & Package

TSSOP28 package (SOT361-1), 4.4 mm body width, 0.65 mm lead pitch - optimized for high-density server motherboard layouts with thermal and routing constraints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar GTL-to-LVTTL translation applications.

Compared with GTL2007PW,118, the GTL2008PW,118 adds synchronized dual-enable power-good control to eliminate boot-time glitches; versus SN74AVC16T245DGGR, it provides native GTL input thresholds, lower propagation delay, and application-specific signal conditioning for processor health monitoring - making it irreplaceable in certified Xeon server designs.

Availability

GTL2008PW,118 is available at Aetrix Electronics and suitable for server motherboard design, dual-CPU thermal management systems, and platform health monitoring subsystems requiring stable component supply across extended product lifecycles.

Supply support for GTL2008PW,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and computing applications.

The GTL2008PW,118 belongs to NXP's GTL translator family, engineered specifically for high-reliability signal interfacing in multi-processor server platforms where precise power sequencing and glitch-free health monitoring are mandatory.

FAQ

What is the primary function of the GTL2008PW,118 in a dual-Xeon server platform?

The GTL2008PW,118 serves as a 12-bit GTL-to-LVTTL translator that routes and conditions critical health signals-including THRMTRIP_L, PROCHOT_L, IERR_L, and SMI_L-between dual Xeon processors, South Bridge, and Platform Health Management logic. Its dual enable (EN1/EN2) architecture ensures outputs enter high-impedance during power-up, preventing false fault assertions. The GTL2008PW,118 is essential for reliable boot sequencing and real-time processor health monitoring in enterprise servers.

How does the GTL2008PW,118 handle power-up sequencing to avoid spurious signals?

The GTL2008PW,118 uses EN1 and EN2 inputs to hold all LVTTL and GTL outputs in high-impedance until VCC reaches nominal voltage, all inputs reach valid logic states, and VREF stabilizes at its proper level. This guarantees glitch-free operation during boot. Notably, the 11BO output is actively driven LOW upon power-up when EN2 is LOW to prevent false NMI assertion before system initialization completes. The GTL2008PW,118 thus eliminates need for external power-good synchronization circuitry.

What are the voltage reference requirements for GTL signaling with the GTL2008PW,118?

The GTL2008PW,118 requires a VREF input between 0.64 V and 1.1 V to define GTL switching thresholds, supporting typical Xeon VTT ranges of 1.1 V to 1.2 V and accommodating future 0.63×VTT specifications (minimum 0.693 V at VTT = 1.1 V). Characterization confirms minimal DC/AC performance variation across this VREF range. The GTL2008PW,118 also accepts GTL inputs referenced to VREF ±0.050 V and LVTTL inputs with VIH ≥2 V and VIL ≤0.8 V.

Which pins on the GTL2008PW,118 are open-drain and what external components do they require?

Pins 2–6 (1AO–2AO, 5A), 8 (11A), 10–11 (3AO–4AO), 15 (9AO), and 22 (11A) are open-drain LVTTL outputs/IOs and require external pull-up resistors per application guidance (e.g., 1.2–1.5 kΩ for SMI/NMI lines). The GTL2008PW,118 integrates 30 Ω series termination on these outputs to reduce trace ringing. In contrast, GTL outputs (e.g., 7BO1, 10BO1, 11BO) are push-pull and do not require external termination.

Can the GTL2008PW,118 be used as a direct replacement for the GTL2007PW,118?

No - while the GTL2008PW,118 is functionally and footprint identical to the GTL2007PW,118, it introduces critical power-good control: EN1/EN2 force high-impedance outputs during power-up, whereas the GTL2007PW,118 drives outputs immediately. Substituting GTL2008PW,118 for GTL2007PW,118 may cause timing mismatches if the system relies on early output activity. The GTL2008PW,118 is not a drop-in replacement; board-level validation of enable timing and signal integrity is required.