Renesas 8T349316NLGI

Overview

8T349316NLGI from IDT is a 2.5V LVDS 1:16 clock fanout buffer with differential input translation capability (HSTL/LVPECL/CML/LVDS/LVCMOS), guaranteed output skew <50ps, propagation delay <1.75ns, and operation up to 1GHz. It serves as a low-jitter clock distribution node in high-speed telecom infrastructure backplanes and wireless baseband timing networks.

For engineers reviewing the 8T349316NLGI datasheet, 8T349316NLGI pinout, 8T349316NLGI application, or 8T349316NLGI equivalent, key selection criteria include its dual-differential-input redundancy, asynchronous output enable/disable per group (Q[1:8]/Q[9:16]), GL-controlled disable-state output polarity, and 52-lead VFQFN-P package thermal performance for sustained 1GHz switching.

Technical Context

The 8T349316NLGI implements a fully differential signal path with two selectable differential inputs (A1/nA1 and A2/nA2) routed via SEL-controlled multiplexer to sixteen LVDS output pairs. Its internal architecture supports asynchronous input switchover without glitching, enabling seamless primary-to-standby clock source transition in carrier-grade systems.

Each output pair (Qx/nQx) delivers compliant LVDS signaling with VOD = 247–454mV and VOS = 1.125–1.375V, while independent nG1/nG2 control pins allow group-wise output enable/disable with 3.5ns latency. Power-down mode (nPD) reduces supply current to 5mA and forces all outputs to VDD.

Key Specifications

Pinout & Package

52-lead VFQFN-P (NL package) with exposed thermal pad (EPAD); 8mm × 8mm body, 0.9mm height; requires PCB land pattern and ≥6 thermal vias to ground plane for thermal management per IDT AN.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock fanout buffer applications.

Compared with 8T349316NLGI8, the tray-packaged 8T349316NLGI simplifies manual handling and evaluation, while Si53302-A01AGM trades raw fanout simplicity for jitter-cleaning capability-making it suitable only when upstream clock quality is insufficient for direct distribution.

Availability

8T349316NLGI is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport equipment, and high-density data center switch timing applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 8T349316NLGI 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

Integrated Device Technology (IDT), now part of Renesas Electronics, designs high-performance timing, memory interface, and RF power management ICs for communications and computing markets.

The 8T349316NLGI belongs to IDT's high-performance clock family, engineered specifically for low-skew, high-frequency clock distribution in carrier-grade telecom and wireless infrastructure equipment.

FAQ

What input signal types does the 8T349316NLGI support?

The 8T349316NLGI supports differential inputs including HSTL, LVPECL, CML, and LVDS, plus single-ended 3.3V or 2.5V LVCMOS/LVTTL signals when wired with an external bias network. Input common-mode voltage must stay within 0.5V to VDD, and peak-to-peak amplitude must be between 0.15V and 3.6V. All specifications for these interfaces are validated per the 8T349316NLGI datasheet revision 2.

How does the 8T349316NLGI handle clock source redundancy?

The 8T349316NLGI implements hardware-based redundancy via two differential input pairs (A1/nA1 and A2/nA2) and the SEL pin. When SEL = 1, A1/nA1 is active; when SEL = 0, A2/nA2 is selected. This asynchronous switchover occurs without glitches or metastability, enabling seamless failover in mission-critical 8T349316NLGI-based timing systems such as 5G baseband units.

What is the function of the GL pin on the 8T349316NLGI?

The GL (Global Level) pin on the 8T349316NLGI determines the output state of disabled LVDS drivers: when GL = 0 and nG1/nG2 = 1, Q[1:8]/Q[9:16] drive low/high respectively; when GL = 1 and nG1/nG2 = 1, they drive high/low. This prevents floating or undefined states on terminated buses, ensuring predictable behavior during power sequencing or partial shutdown in the 8T349316NLGI design.

Can the 8T349316NLGI operate at frequencies above 1GHz?

No-the 8T349316NLGI is characterized and guaranteed up to 1GHz maximum output frequency per its datasheet AC specifications. While some units may function beyond this under ideal conditions, timing parameters including skew, pulse skew, and propagation delay are not specified or tested above 1GHz. For reliable operation in production systems using the 8T349316NLGI, clock inputs must remain ≤1GHz.

What thermal design guidance applies to the 8T349316NLGI's VFQFN package?

The 8T349316NLGI uses a 52-lead VFQFN-P package with an exposed thermal pad (EPAD). To maintain junction temperature ≤125°C at full load and +85°C ambient, the PCB must include a soldered land pattern matching the EPAD size and ≥6 thermal vias (12–13 mil diameter, 1oz plating) connecting directly to a solid ground plane. Without this, θJA degrades beyond the rated 33°C/W, risking thermal shutdown or accelerated aging of the 8T349316NLGI.