Diodes Incorporated PI6C4853111FAEX

Overview

PI6C4853111FAEX from Diodes Incorporated is a 1-to-10 differential LVPECL fanout buffer with dual selectable differential clock inputs (CLK0/CLK1), 500MHz max frequency, <100fs additive jitter (12kHz–20MHz), and 35ps typical output skew. It supports LVPECL/LVDS/CML/SSTL inputs and delivers ten matched LVPECL output pairs for low-noise clock distribution in high-speed SerDes timing systems.

For engineers reviewing the PI6C4853111FAEX datasheet, PI6C4853111FAEX pinout, PI6C4853111FAEX application, or PI6C4853111FAEX equivalent, key selection criteria include differential input mux control (CLK_SEL), dual supply domains (3.3V core / 2.5V or 3.3V outputs), TQFP-32 package compatibility, and sub-100fs jitter performance at 156.25MHz reference.

Technical Context

The device implements a 2:1 differential clock multiplexer feeding a low-skew fanout stage with ten identical LVPECL output drivers. Input selection is controlled by a single LVCMOS/LVTTL CLK_SEL signal with internal 50kΩ pull-down, enabling deterministic routing between two independent differential sources without external logic.

All ten output pairs (Q0–Q9) share matched propagation delay (4ns typ) and are internally terminated to minimize inter-pair skew (35ps typ). Output power supplies (VDDO pins at pins 9,16,25,32) are decoupled per quadrant to maintain signal integrity across full 500MHz operation under mixed 2.5V/3.3V output voltage configurations.

Key Specifications

Pinout & Package

Package: 32-pin Pb-free Green TQFP (FA), 7mm × 7mm, 0.8mm pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICS85310AMLF and PI6C20400WEX, PI6C4853111FAEX uniquely delivers 10-channel LVPECL fanout with hardware-muxed dual inputs and industry-leading <100fs jitter-making it the only option qualified for 10G+ serial link timing where skew and phase noise are design-critical.

Availability

PI6C4853111FAEX is available at Aetrix Electronics and suitable for 10G Ethernet PHY clock distribution, PCIe Gen4 root complex fanout, and DDR4 memory subsystem timing requiring stable component supply across extended production cycles.

Supply support for PI6C4853111FAEX 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 PI6C4853111 belongs to Diodes' Pericom-branded clock buffer product line, engineered specifically for ultra-low-jitter, multi-output clock distribution in high-speed serial interface applications including PCIe, Ethernet, and memory subsystems.

FAQ

What input voltage levels does PI6C4853111FAEX support on its differential clock inputs?

The device accepts LVPECL, LVDS, CML, and SSTL input signal levels directly-no external termination or level shifting required. CLK0 and CLK1 inputs feature internal 75kΩ pull-down resistors, while /CLK0 and /CLK1 default to VDD/2 if left floating, enabling robust single-ended operation when needed.

How is output skew minimized across all ten LVPECL output pairs?

Output skew is minimized through matched internal driver paths, quadrant-based VDDO supply separation (pins 9,16,25,32), and symmetrical layout of all ten differential output pairs. Measured output-to-output skew is 35ps typical under matched load conditions, verified across temperature and voltage extremes per AC specifications.

Can PI6C4853111FAEX operate with different output voltages on separate output pairs?

No-VDDO is shared across quadrants (pins 9/16, 25/32), so all outputs within a quadrant must use the same VDDO voltage (2.5V or 3.3V). However, quadrant-level independence allows mixing 2.5V and 3.3V outputs across the full 10-pair set, e.g., Q0–Q4 at 2.5V and Q5–Q9 at 3.3V.

What is the recommended termination for LVPECL outputs?

Each LVPECL output pair requires 50Ω differential termination to VDDO − 2.0V. This matches standard LVPECL DC biasing and ensures optimal rise/fall time (150–700ps) and duty cycle (45–55%) across the 500MHz bandwidth, as specified in the AC characteristics table.