Texas Instruments SN74GTL2107PWRG4

Overview

SN74GTL2107PWRG4 from Texas Instruments is a 12-bit bidirectional GTL–/GTL/GTL+ to LVTTL translator in TSSOP-28 package, operating at 3.3 V supply with VREF-adjustable reference (0.6–1.0 V), 16 mA LVTTL output drive, and 15 mA GTL sink capability. It interfaces Xeon™ processor GTL I/O with LVTTL chipsets for dual-processor platform health management.

For engineers reviewing the SN74GTL2107PWRG4 datasheet, SN74GTL2107PWRG4 pinout, SN74GTL2107PWRG4 application, or SN74GTL2107PWRG4 equivalent, key selection criteria include GTL–/GTL+/GTL compatibility, open-drain vs totem-pole output configuration per channel group, VREF-dependent input thresholds, propagation delays under 11 ns (B→A), and powered-down high-impedance behavior on LVTTL inputs.

Technical Context

The SN74GTL2107PWRG4 implements dual-voltage translation using separate A-port (LVTTL) and B-port (GTL–/GTL/GTL+) I/O banks, with two independent enable controls (EN1, EN2) managing directionality and output states. Each port supports mixed signal roles: A-port includes totem-pole outputs (1AO–4AO, 9AO), open-drain outputs (5A, 6A), and open-drain inputs/outputs (11A); B-port comprises fully open-drain GTL I/O (1BI–6BI, 9BI, 10BI1/2, 11BI, 7BO1/2, 10BO1/2, 11BO).

Internal delay circuitry on EN2-controlled paths (e.g., 5BI/6BI → 7BO1/2) prevents transient glitches during level transitions, and all GTL I/O reference VREF to set switching thresholds-0.6 V for GTL–, 0.8 V for GTL, and 1.0 V for GTL+. The device complies with JEDEC JESD78 latch-up testing and JESD22 ESD standards (2000-V HBM, 200-V MM, 1000-V CDM).

Key Specifications

Pinout & Package

TSSOP-28 package (PW), 4.4 mm × 9.7 mm body, 0.65 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74GTL2107PWRG4, SN74GTL16212DGGR offers scalability but increases layout complexity, while SN74AVC16T245DGGR sacrifices GTL precision and glitch immunity for lower cost-neither provides the exact combination of 12-bit GTL variant support, EN2-delayed outputs, and powered-down input isolation found in SN74GTL2107PWRG4.

Availability

SN74GTL2107PWRG4 is available at Aetrix Electronics and suitable for server platform health monitoring, CPU thermal management interface, multi-processor SMI signal routing, and platform error reporting bus applications requiring stable component supply and long-term industrial availability.

Supply support for SN74GTL2107PWRG4 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 specializing in analog, embedded processing, and logic solutions, with leadership in interface, power management, and signal chain technologies.

The SN74GTL2107PWRG4 belongs to TI's 74GTL logic family, designed specifically for high-speed, low-noise voltage translation in Intel Xeon-based server and workstation platforms where GTL bus compatibility and thermal event timing integrity are critical.

FAQ

What is the function of VREF on SN74GTL2107PWRG4?

VREF on SN74GTL2107PWRG4 sets the switching threshold for all GTL–/GTL/GTL+ inputs and determines the high-level output voltage for GTL outputs. Configured to 0.6 V, 0.8 V, or 1.0 V, it enables compatibility with GTL– (0.9 V VTT), GTL (1.2 V VTT), and GTL+ (1.5 V VTT) buses respectively. The SN74GTL2107PWRG4 uses this reference to ensure accurate signal recognition and noise margin across all three GTL variants without external resistive dividers.

Does SN74GTL2107PWRG4 support bidirectional translation without external control logic?

Yes, SN74GTL2107PWRG4 supports automatic bidirectional translation on designated pins (e.g., 9BI ↔ 9AO, 11BI ↔ 11BO) where direction is determined by output-enable state and bus drive conditions. However, controlled bidirectionality for groups like 1BI–4BI ↔ 1AO–4AO requires EN1/EN2 assertion. The SN74GTL2107PWRG4 does not auto-sense direction like some newer translators; explicit enable control is required for most channel groups to prevent contention.

How does SN74GTL2107PWRG4 behave when VCC = 0 V?

When VCC = 0 V, all LVTTL inputs (including 10AI1, 10AI2, EN1, EN2) enter a high-impedance state with no leakage to VDD, even if externally pulled to 3.3 V. GTL inputs and open-drain outputs also exhibit high-Z behavior under these conditions. However, LVTTL totem-pole outputs (e.g., 1AO–4AO, 9AO) may conduct current if pulled high while unpowered, so SN74GTL2107PWRG4 requires careful power sequencing in hot-swap designs.

What is the purpose of the delay on EN2-controlled outputs in SN74GTL2107PWRG4?

The built-in delay on EN2-controlled outputs (7BO1/7BO2) prevents transient low-glitches that could occur when 5BI/6BI transitions from low to high while 5A/6A lags by up to 100 ns. This delay ensures stable assertion of platform health signals like THRMTRIP_L. In SN74GTL2107PWRG4, this feature is hardwired and cannot be disabled-it is essential for reliable CPU thermal event handling in dual-processor systems.

Can SN74GTL2107PWRG4 replace SN74GTL2107PWR in a design?

Yes, SN74GTL2107PWRG4 is a drop-in replacement for SN74GTL2107PWR, sharing identical electrical specifications, pinout, package (TSSOP-28), and marking (GK2107). The "G4" suffix denotes TI's green packaging standard (lead-free, RoHS-compliant), with no functional or timing differences. SN74GTL2107PWRG4 maintains full backward compatibility and may be used interchangeably in existing layouts without modification.