Diodes Incorporated PI6C4911505LIEX

Overview

PI6C4911505LIEX from Diodes Incorporated is a high-performance 1:5 LVPECL fanout buffer supporting up to 1.5 GHz output frequency, ultra-low additive phase jitter (<0.03 ps RMS, 12 kHz–20 MHz), and dual selectable differential inputs (LVPECL/LVDS/HCSL/CML). It operates from a 3.3 V supply with industrial temperature range (−40°C to +85°C) and is used in high-speed clock distribution for networking switches and telecom backplanes.

For engineers reviewing the PI6C4911505LIEX datasheet, PI6C4911505LIEX pinout, PI6C4911505LIEX application, or PI6C4911505LIEX equivalent, key selection criteria include differential input compatibility, sub-1.6 ns propagation delay, LVPECL output drive capability, output skew ≤40 ps across five channels, and TSSOP-20 packaging for dense PCB layouts.

Technical Context

The PI6C4911505LIEX implements a low-skew, single-stage fanout architecture with independent input selection via CLK_SEL and global output enable via CLK_EN. Its internal termination and biasing support direct interfacing to LVPECL, LVDS, HCSL, and CML sources without external level-shifting circuitry.

It delivers matched differential LVPECL outputs (Q0–Q4/nQ0–nQ4) with 400 mV single-ended swing, 48–52% duty cycle at <650 MHz, and 150 ps rise/fall times. Input common-mode voltage range (GND + 0.5 V to VDD − 0.85 V) and differential amplitude (0.15–VDD−0.85 V) ensure robust signal integrity across multiple logic families.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (173 mil wide, JEDEC MO-153), lead-free and halogen-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT8T49N242A and ICS85310AMLF, the PI6C4911505LIEX offers superior high-frequency performance (1.5 GHz vs. ≤800 MHz), native dual-differential input selection, and optimized LVPECL drive for telecom infrastructure - making it the preferred choice for jitter-critical, multi-source clock distribution without PLL complexity or voltage conversion overhead.

Availability

PI6C4911505LIEX is available at Aetrix Electronics and suitable for networking switches, optical transport platforms, high-frequency compute backplanes, and 10G/25G Ethernet line cards requiring stable component supply and long-term industrial-grade availability.

Supply support for PI6C4911505LIEX 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The PI6C4911505LIEX belongs to Diodes' high-speed timing product line, engineered specifically for low-jitter clock distribution in networking, telecom, and data center infrastructure where signal integrity and thermal reliability are critical.

FAQ

What input logic families does the PI6C4911505LIEX support?

The device accepts LVPECL, LVDS, HCSL, and CML differential inputs directly via internal biasing networks. Single-ended CMOS/LVCMOS signals can be adapted using an external VDD/2 reference network as shown in Figure 1 of DS43308 Rev 1-2. Input common-mode range is GND + 0.5 V to VDD − 0.85 V, and differential amplitude must be ≥0.15 V.

How is output enable functionality implemented?

CLK_EN is an active-high input that globally enables or disables all five LVPECL output pairs. When CLK_EN = LOW, all Qx outputs drive LOW and all nQx outputs drive HIGH. When CLK_EN = HIGH, outputs follow the selected input clock with 1.5 ns typical propagation delay. No internal pull-up is required - external pull-up to VDD is recommended for default-enable behavior.

Does the PI6C4911505LIEX require external termination resistors?

No external termination is needed for LVPECL outputs - each differential pair includes internal 50 Ω source termination referenced to VDD − 2 V. However, proper PCB layout with controlled 50 Ω differential impedance and minimal stub length is essential to maintain signal integrity at 1.5 GHz. VEE must be connected to ground for standard operation.

Can the PI6C4911505LIEX operate with a 2.5 V supply?

No - the PI6C4911505LIEX is specified only for 3.3 V ±3.5% (3.135–3.465 V) operation. Its LVPECL output stage, input threshold levels, and internal biasing are designed exclusively for 3.3 V rails. Attempting 2.5 V operation will result in undefined logic states, degraded jitter performance, and potential damage due to improper internal node biasing.