Diodes Incorporated PI6C4911505-04LIEX

Overview

PI6C4911505-04LIEX from Diodes Incorporated (acquired Pericom) is a high-performance 1:5 LVPECL fanout buffer with dual selectable clock inputs, 1.5 GHz max output frequency, <0.03 ps typ additive phase jitter (12 kHz–20 MHz), 1.5 ns typical propagation delay, and support for 2.5 V/3.3 V supplies in industrial temperature range (–40°C to +85°C). It distributes low-jitter clock signals in high-speed networking switch fabric timing paths.

For engineers reviewing the PI6C4911505-04LIEX datasheet, PI6C4911505-04LIEX pinout, PI6C4911505-04LIEX application, or PI6C4911505-04LIEX equivalent, key selection criteria include differential/single-ended input flexibility, LVPECL output drive capability, sub-200 ps output skew, additive jitter performance at 156.25 MHz, and TSSOP-20 thermal/power handling in backplane clock distribution.

Technical Context

This device implements a dual-input multiplexer feeding five matched LVPECL output drivers, with synchronous enable (nEN) and clock source selection (CLK_SEL) logic. Input stage accepts either differential LVPECL/LVDS (CLK0/nCLK0) or single-ended LVCMOS (CLK1), supporting seamless integration into mixed-signal clock trees.

Output stage delivers rail-to-rail LVPECL-compatible swing (VOH/VOL defined per supply), with tightly controlled inter-output skew (80 ps typ TSK) and part-to-part skew (150 ps typ TP2P), enabling deterministic timing across multi-lane SerDes receivers and FPGA clock domains.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (L), 173 mil width, Pb-free and RoHS-compliant, thermal pad not present, JEDEC MO-153F/AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT8T49N285A and NB3N511MNR2G, PI6C4911505-04LIEX offers optimal balance of 5-output count, ultra-low jitter (<0.03 ps), dual-input flexibility, and TSSOP-20 footprint-making it preferred for fixed-frequency, low-skew clock distribution in space-constrained telecom and computing modules.

Availability

PI6C4911505-04LIEX is available at Aetrix Electronics and suitable for 10G/25G Ethernet switch fabric, PCIe Gen4/Gen5 root complex clocking, optical transport network line cards, and FPGA-based high-speed data acquisition requiring stable component supply and long-term lifecycle assurance.

Supply support for PI6C4911505-04LIEX 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 acquired Pericom Semiconductor in 2017 and integrates its high-performance timing portfolio into broad analog and mixed-signal solutions for communications, computing, and industrial markets.

The PI6C4911505-04LIEX belongs to Diodes' Precision Timing family, engineered specifically for low-jitter clock distribution in high-speed serial interfaces-including Ethernet, PCIe, and OTN-where deterministic skew and phase noise are critical.

FAQ

What clock input types does the PI6C4911505-04LIEX support?

The device accepts two distinct input types: differential LVPECL/LVDS via CLK0/nCLK0 (VID = 0.15–1.3 Vpp, VCM = VEE+0.5 to VDD–0.85 V), and single-ended LVCMOS via CLK1 (VIH = 1.7 V min at 2.5 V supply, 2.0 V min at 3.3 V supply). CLK_SEL pin selects between them; no external level-shifting components are required.

How is the nEN pin used for power sequencing?

nEN is an active-low synchronous enable: when LOW, all Qx outputs drive valid LVPECL logic levels; when HIGH, Qx outputs are forced LOW and nQx outputs forced HIGH-providing known, glitch-free DC states during reset or sleep modes. This behavior is guaranteed across full temperature and voltage ranges per datasheet Table 2.

Can PI6C4911505-04LIEX operate with only a 3.3 V supply?

Yes. The device operates with VDD = 3.3 V ±10% (3.0–3.6 V) and VEE = –0.5 V. Output VOH/VOL specifications are explicitly defined for 3.3 V operation (VOH = 2.1–2.6 V, VOL = 1.25–1.8 V), and AC parameters including 1.5 GHz max frequency and 0.03 ps jitter are characterized under these conditions.

What is the significance of the 80 ps typical output skew (TSK)?

TSK measures maximum time deviation between any two LVPECL output edges under identical load and supply conditions. At 80 ps typ, it guarantees sub-100 ps alignment across all five outputs-critical for maintaining setup/hold timing margins in multi-lane SerDes receivers (e.g., 100G QSFP28) and parallel clock domains in FPGAs, where skew-induced timing violations cause data corruption.