Texas Instruments SN74GTL2006PWG4

Overview

SN74GTL2006PWG4 from Texas Instruments is a 13-bit bidirectional GTL-/GTL/GTL+ to LVTTL voltage-level translator designed for dual-processor platform health management. It supports 3.3-V LVTTL I/O interfacing with Xeon® processor GTL-family signals, features open-drain and totem-pole outputs, operates from −40°C to 85°C, and includes JEDEC JESD78 latch-up immunity (>500 mA).

For engineers reviewing the SN74GTL2006PWG4 datasheet, SN74GTL2006PWG4 pinout, SN74GTL2006PWG4 application, or SN74GTL2006PWG4 equivalent, key selection considerations include GTL reference voltage (VREF) tolerance (±50 mV), B-port low-level output voltage (VOL = 0.4 V at 15 mA), propagation delays (tPLH/tPHL ≤ 10 ns for A↔B translation), and powered-down input high-impedance behavior on all LVTTL inputs.

Technical Context

The SN74GTL2006PWG4 implements asymmetric bidirectional translation between 3.3-V LVTTL and GTL-family buses (GTL−/GTL/GTL+) using dedicated VREF-biased differential receivers on the B port and standard CMOS drivers on the A port. It integrates series termination (30 Ω) on TTL outputs and supports mixed-signal timing via delay-compensated enable logic for 7BO1/7BO2.

Its architecture includes five distinct I/O configurations: totem-pole LVTTL I/Os (1AO–4AO, 9AO), open-drain LVTTL I/Os (5A/6A, 11A), open-drain GTL I/Os (5BI/6BI, 11BI), dedicated GTL inputs (1BI–4BI, 9BI), and dual-input GTL receivers (10AI1/10AI2 → 10BO1/10BO2). All B-port inputs require external VREF (0.6–1.1 V) and VTT (0.85–1.65 V) biasing.

Key Specifications

Pinout & Package

TSSOP-28 (PW) package with 0.65-mm pitch, 9.7-mm × 4.4-mm body, and exposed pad not present. Pin 1 located at top-left corner (Q1 quadrant per tape-and-reel spec).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74GTL2006PWG4, SN74GTL16212DGGR offers greater channel density but omits the delay-compensated dual-input logic essential for PROCHOT/SMI coordination; SN74AVC16T245DGGR provides broader voltage flexibility but cannot meet GTL+ VREF/VTT biasing or sub-10 ns timing requirements in Xeon platform health circuits.

Availability

SN74GTL2006PWG4 is available at Aetrix Electronics and suitable for dual-processor server motherboard design, platform health management subsystems, and Xeon-based compute infrastructure requiring stable component supply across extended product lifecycles.

Supply support for SN74GTL2006PWG4 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The SN74GTL2006PWG4 belongs to TI's GTL translator product line, engineered specifically for high-reliability, low-latency signal bridging between Intel Xeon processor GTL-family I/O and standard LVTTL chipset interfaces.

FAQ

What is the function of VREF on SN74GTL2006PWG4, and what happens if it is left unconnected?

VREF on SN74GTL2006PWG4 sets the switching threshold for all GTL inputs (pins 7, 9, 16–27); it must be externally supplied within 0.5 V to 1.1 V. If left unconnected, GTL input thresholds become undefined, causing erratic logic interpretation, metastability, and potential bus contention. The SN74GTL2006PWG4 datasheet specifies ±50 mV tolerance around nominal VREF - a stable, low-noise source with local decoupling is mandatory for reliable operation.

Does SN74GTL2006PWG4 support GTL+, GTL, and GTL− simultaneously on the same B port?

Yes - the SN74GTL2006PWG4 supports all three GTL variants on its B port by adjusting VREF and VTT. For GTL−, use VREF = 0.6 V and VTT = 0.9 V; for GTL, use VREF = 0.8 V and VTT = 1.2 V; for GTL+, use VREF = 1.0 V and VTT = 1.5 V. Each configuration maintains valid VOL (≤0.4 V) and VIH/VIL margins per JEDEC GTL specifications, and the SN74GTL2006PWG4 switching characteristics table confirms timing compliance across all three modes.

How does SN74GTL2006PWG4 behave during power-down, and which pins remain safe to drive?

During power-down (VCC = 0 V), all LVTTL inputs (2–6, 8, 10–13, 15, 10AI1, 10AI2, 11A) enter high-impedance state with no leakage to VCC. GTL inputs (7, 9, 16–27) and open-drain outputs (5A/6A, 11A, 5BI/6BI, 11BI) also exhibit no supply leakage when pulled high. However, totem-pole LVTTL outputs (1AO–4AO, 9AO) will conduct if externally driven high - the SN74GTL2006PWG4 FAQ explicitly warns against this condition to prevent damage.

What is the purpose of the delay logic on SN74GTL2006PWG4 pins 7BO1 and 7BO2?

The built-in delay on SN74GTL2006PWG4 pins 7BO1 and 7BO2 prevents low-glitch transients when 5BI/6BI transition from low to high while 5A/6A experience up to 100 ns propagation lag. This hardware-enforced timing margin eliminates the need for external RC filters or firmware debouncing in critical platform health signals like FORCEPR_L or SMI_L, directly improving system robustness in dual-processor synchronization paths.

Can SN74GTL2006PWG4 replace SN74GTL2003 in an existing design?

No - SN74GTL2006PWG4 is not a drop-in replacement for SN74GTL2003. While both are GTL translators, SN74GTL2003 is an 8-bit device with different pinout, no 10AI1/10AI2 dual-input logic, and no delay-compensated 7BO1/7BO2 enable path. The SN74GTL2006PWG4 has 13 functional channels, distinct VREF dependency, and unique timing architecture; redesign of PCB layout, firmware timing, and biasing network would be required to migrate from SN74GTL2003 to SN74GTL2006PWG4.