Diodes Incorporated PI6C485311WE

Overview

PI6C485311WE from Diodes Incorporated is a 3.3V, low-skew 1-to-2 differential-to-LVPECL fanout buffer with two selectable differential inputs and four LVPECL outputs. It supports 800MHz maximum operation frequency, ≤100ps output skew, and accepts LVDS/LVPECL/LVHSTL/SSTL/HCSL input levels. It is used in high-speed clock distribution for telecom and datacom systems requiring precise timing integrity.

For engineers reviewing the PI6C485311WE datasheet, PI6C485311WE pinout, PI6C485311WE application, or PI6C485311WE equivalent, key selection criteria include differential input compatibility, LVPECL output drive capability, sub-2ns propagation delay, and dual-package availability (SOIC-W and MSOP-U) for layout flexibility in dense PCB designs.

Technical Context

The PI6C485311WE implements a dual-input, quad-output LVPECL fanout architecture with independent CLK/nCLK and PCLK/nPCLK differential input pairs-each configurable for LVPECL, LVDS, SSTL, or HCSL signaling. Input biasing supports single-ended operation via external resistor networks referenced to VCC/2.

Its timing performance is defined by 2ns max propagation delay, 100ps max output-to-output skew, and 150ps max part-to-part skew under matched load and supply conditions. All outputs are terminated to VCC–2V via 50Ω resistors, delivering 0.6–1.0Vpp swing with VOH/VOL specified at VCC–0.9V and VCC–1.6V respectively.

Key Specifications

Pinout & Package

PI6C485311WE is available in two RoHS-compliant, lead-free packages: 8-pin SOIC-W (width 3.9mm) and 8-pin MSOP-U (width 3.0mm), both with gull-wing leads and thermal pad omitted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICS85311AMLF and NB3N551DR2G, PI6C485311WE delivers superior skew performance (100ps vs. 250ps), broader input compatibility (5 logic families vs. 1), and dual-package flexibility-making it optimal for new 5G and high-speed datacom designs demanding timing precision and supply-chain resilience.

Availability

PI6C485311WE is available at Aetrix Electronics and suitable for telecom line cards, data center switch fabrics, and 5G baseband processing systems requiring stable component supply across multi-year production cycles.

Supply support for PI6C485311WE 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 analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in ASE, J-Devices, and its own facilities.

The PI6C485311WE belongs to Diodes' Pericom® timing product line, engineered specifically for high-speed clock distribution in datacom, telecom, and enterprise storage systems where sub-100ps skew and multi-standard input compatibility are critical.

FAQ

What input voltage levels does PI6C485311WE support on the CLK/nCLK pins?

The CLK/nCLK inputs accept LVPECL, LVDS, LVHSTL, SSTL, and HCSL signaling standards. Differential input voltage range is 0.15–1.3Vpp with common-mode voltage from VEE+0.5V to VCC–0.85V. For single-ended use, external bias sets VREF to VCC/2, and absolute max input is VCC+0.3V.

Can PI6C485311WE operate with a 2.5V supply?

No. PI6C485311WE is specified only for 3.0–3.6V operation. The LVPECL output stage requires VCC–2V termination, which would fall below valid logic thresholds at 2.5V. Attempting 2.5V operation risks undefined output states and violates Absolute Maximum Ratings.

How is output termination implemented for LVPECL signals?

Each LVPECL output pair (Q0/nQ0, Q1/nQ1) must be terminated to VCC–2V using two 50Ω resistors-one from Qx to VCC–2V and one from nQx to VCC–2V. This establishes the correct DC bias point (VOH ≈ VCC–0.9V, VOL ≈ VCC–1.6V) and ensures 50Ω source impedance matching to transmission lines.

Is PI6C485311WE qualified for automotive applications?

No. While rated for –40°C to +85°C, PI6C485311WE is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-grade versions require PPAP capability and IATF 16949 manufacturing-neither of which applies to the WE suffix variant. Use only in industrial or commercial environments.