Diodes Incorporated PI6C4911504-03LIEX

Overview

PI6C4911504-03LIEX from Diodes Incorporated is a high-performance LVPECL fanout buffer with four differential outputs, supporting up to 1.5 GHz output frequency, ultra-low additive phase jitter (<0.03 ps RMS, 12 kHz–20 MHz), 1.5 ns typical propagation delay, and dual-input selection (CLK or crystal). It operates from 2.5 V or 3.3 V supplies and is qualified for industrial temperature range (−40°C to +85°C), serving clock distribution in high-speed networking switches and telecom backplanes.

For engineers reviewing the PI6C4911504-03LIEX datasheet, PI6C4911504-03LIEX pinout, PI6C4911504-03LIEX application, or PI6C4911504-03LIEX equivalent, key selection criteria include LVPECL output drive capability, input source flexibility (single-ended clock or crystal), low-skew timing performance (25 ps max output skew), and RoHS-compliant TSSOP-20 packaging for space-constrained board layouts.

Technical Context

This device implements a synchronous fanout architecture with asynchronous CLK_EN control, enabling glitch-free output enable/disable without disrupting internal clock synchronization. Input selection between CLK and XTAL is controlled by CLK_SEL, while internal pullup/pulldown resistors (50 kΩ) eliminate external biasing components.

The LVPECL outputs are fully differential (Qx/nQx pairs), each delivering 400 mV single-ended swing with 48–52% duty cycle and sub-150 ps rise/fall times. Propagation delay (1500 ps typ.) and output skew (25 ps max across all four outputs) are specified under matched load conditions (50 Ω termination), ensuring deterministic timing in multi-destination clock trees.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT8T49N242A and NB3N502, PI6C4911504-03LIEX uniquely balances crystal input capability, four-LVPECL-output density, ultra-low jitter (<0.03 ps), and TSSOP-20 footprint-making it optimal for space-constrained, jitter-critical fanout-only roles in telecom and datacom infrastructure.

Availability

PI6C4911504-03LIEX is available at Aetrix Electronics and suitable for 10G/25G Ethernet switches, PCIe Gen4/Gen5 server motherboards, and 5G wireless baseband processing units requiring stable component supply and long-term lifecycle assurance.

Supply support for PI6C4911504-03LIEX 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 PI6C4911504-03 belongs to Diodes' Precision Timing product line, engineered specifically for low-jitter clock distribution in high-speed serial data infrastructure where deterministic skew and additive noise directly impact bit-error rate and link margin.

FAQ

What input configurations does PI6C4911504-03LIEX support?

The device supports two mutually exclusive input modes: single-ended LVCMOS/LVTTL clock (applied to CLK pin) or fundamental-mode crystal (connected across XTAL1 and XTAL2). Selection is controlled by the CLK_SEL pin (low = CLK, high = XTAL). Internal 50 kΩ pulldown on CLK_SEL ensures default CLK mode at power-up without external components.

How is LVPECL output termination implemented?

Each LVPECL output pair (Qx/nQx) requires 50 Ω Thevenin termination to VCC−2 V - typically achieved using two 100 Ω resistors (one from Qx to VCC−2 V, one from nQx to VCC−2 V). This matches standard LVPECL DC specifications (VOH = 2.1–2.6 V, VOL = 1.0–1.8 V at VCC = 3.3 V) and ensures signal integrity at 1.5 GHz.

Does PI6C4911504-03LIEX require an external crystal load capacitor?

No. The device integrates optimized crystal drive circuitry and does not require external load capacitors. Crystal selection must meet specified parameters: fundamental mode, 12–50 MHz frequency, ≤50 Ω ESR, ≤7 pF shunt capacitance, and ≤1 mW drive level - all verified per DS43434 Rev 1-2.

Can PI6C4911504-03LIEX operate from a 2.5 V supply while driving 3.3 V LVPECL loads?

Yes. The device supports dual supply voltages: VCC = 2.5 V or 3.3 V. At 2.5 V, LVPECL outputs deliver VOH = 1.3–1.75 V and VOL = 0.4–0.8 V, which remain compatible with standard LVPECL receivers (typically accepting 0.5–2.0 V differential swing). No level-shifting circuitry is needed.