Diodes Incorporated PI4GTL2034LEX

Overview

PI4GTL2034LEX from Diodes Incorporated is a 4-bit GTL−/GTL/GTL+ bidirectional transceiver in TSSOP-14 package, operating from 2.3 V to 3.6 V supply, with 3.6 V-tolerant I/Os, adjustable VREF (0.5 V to VCC/2), and propagation delays as low as 3.5 ns (tPLH) under GTL− conditions. It serves as a level-shifting bus buffer in high-speed backplane and motherboard interconnects.

For engineers reviewing the PI4GTL2034LEX datasheet, PI4GTL2034LEX pinout, PI4GTL2034LEX application, or PI4GTL2034LEX equivalent, key selection criteria include GTL family compatibility, VREF adjustability for termination voltage matching, partial power-down capability, 3.6 V I/O tolerance, and sub-10 ns propagation delay across GTL−/GTL/GTL+ modes.

Technical Context

The PI4GTL2034LEX implements a dual-rail GTL interface with independent B-port inputs and outputs, supporting GTL− (VTT = 0.75–0.95 V), GTL (VTT = 1.14–1.26 V), and GTL+ (VTT = 1.35–1.65 V) signaling standards. Its VREF pin sets the input threshold and is externally adjustable from 0.5 V to VCC/2.

It features partial power-down operation-VCC powered while inputs held at valid logic levels-enabling dynamic bus isolation without full device shutdown. ESD protection exceeds 2000 V HBM and 1000 V CDM, and latch-up immunity exceeds 200 mA per JESD78.

Key Specifications

Pinout & Package

Package: TSSOP-14 (173 mil wide, Pb-free and Green, tape-and-reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar GTL transceiver applications.

Compared with SN74GTL2034PW and 74GTLP22034D, the PI4GTL2034LEX uniquely combines full VREF adjustability (0.5–VCC/2), 40 mA sink capability, and guaranteed 3.6 V I/O tolerance-making it optimal for multi-standard GTL systems requiring field-programmable threshold alignment and robust drive strength.

Availability

PI4GTL2034LEX is available at Aetrix Electronics and suitable for server backplane interconnects, network switch fabric interfaces, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and Pb-free/Green compliance.

Supply support for PI4GTL2034LEX 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance analog, logic, and timing solutions for industrial, computing, and communications markets.

The PI4GTL2034LEX belongs to Diodes' GTL transceiver product line, engineered specifically for high-speed, multi-standard bus interfacing in enterprise and infrastructure equipment where signal integrity, voltage flexibility, and reliability are critical.

FAQ

What is the minimum VREF voltage that guarantees reliable GTL− operation?

The datasheet specifies a minimum VREF of 0.5 V for GTL− mode, with corresponding VTT = 0.75 V. At this setting, input thresholds are centered at VREF ± 50 mV, ensuring noise margins ≥150 mV with typical GTL− bus swing. Operation below 0.5 V risks incorrect logic sampling due to reduced hysteresis margin.

Can PI4GTL2034LEX drive a 50 Ω parallel-terminated GTL bus?

No-it is designed for standard GTL open-drain topologies with series or Thevenin termination, not 50 Ω parallel termination. Its 40 mA sink capability targets 43–60 Ω effective load (e.g., 120 Ω pull-up + 130 Ω Thevenin). Driving 50 Ω directly would exceed IOL ratings and distort waveform edges.

Is partial power-down supported with VCC = 2.3 V?

Yes-partial power-down is functional across the full 2.3–3.6 V supply range. When VCC is applied and inputs are held static (VI ≤ VREF − 50 mV or ≥ VREF + 50 mV), outputs enter high-impedance state without disabling internal bias, preserving bus isolation at lowest valid supply.

How does VREF affect propagation delay in GTL+ mode?

In GTL+ mode (VTT = 1.5 V), increasing VREF from 1.0 V to 1.1 V raises input threshold, slightly increasing tPHL by ~0.3 ns due to longer input transition time through the switching region-but tPLH remains stable. Delay variation stays within ±0.5 ns across VREF's full 1.0–1.1 V GTL+ range.