Diodes Incorporated PI6C49X0204B-AWEX

Overview

PI6C49X0204B-AWEX from Pericom Semiconductor is a low-skew 1-to-4 LVCMOS/LVTTL fanout buffer IC used for high-fidelity clock distribution in synchronous digital systems. It delivers four matched outputs with ≤45ps output skew, ≤500ps part-to-part skew, and 200MHz maximum output frequency at 3.3V or 2.5V VDDO, supporting timing-critical applications such as FPGA clock trees and memory interface controllers.

For engineers reviewing the PI6C49X0204B-AWEX datasheet, PI6C49X0204B-AWEX pinout, PI6C49X0204B-AWEX application, or PI6C49X0204B-AWEX equivalent, key selection criteria include additive phase jitter (0.06ps RMS), dual-supply flexibility (3.3V core / 2.5V or 3.3V output), SOIC-8 thermal resistance (157°C/W), and guaranteed skew performance across temperature (0°C to 70°C).

Technical Context

This device implements a single-ended LVCMOS/LVTTL input stage with internal pulldown resistors (51kΩ) and four buffered, low-impedance outputs (5–12Ω typical). Its architecture ensures deterministic propagation delay (2.35ns typ.) and tight duty cycle control (40–60% over full frequency range), enabling precise edge alignment in multi-sink clock networks.

The dual-supply design separates core logic (VDD) from output drivers (VDDO), allowing independent voltage scaling for noise isolation and compatibility with mixed-voltage system domains. Additive jitter is measured referenced to input phase noise (12kHz–20MHz band), confirming intrinsic buffer contribution remains below 0.06ps RMS at 156.25MHz.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (150-mil width, Pb-free & Green compliant, package code W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT 5PB1102C and ON Semi NB3N402M, the PI6C49X0204B-AWEX uniquely supports dual-output-voltage operation (2.5V/3.3V) while maintaining 200MHz capability and guaranteed 45ps skew-making it optimal for mixed-domain systems where supply flexibility and timing precision are jointly constrained.

Availability

PI6C49X0204B-AWEX is available at Aetrix Electronics and suitable for FPGA clock distribution, DDR memory interfaces, industrial PLC timing modules, and medical imaging data acquisition requiring stable component supply across production lifecycles.

Supply support for PI6C49X0204B-AWEX 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

Pericom Semiconductor (acquired by Diodes Incorporated in 2016) specialized in high-performance timing, interface, and signal-integrity solutions for communications, computing, and industrial markets.

The PI6C49X series targets low-skew clock distribution in space-constrained, thermally demanding applications-designed specifically for systems requiring deterministic skew, dual-supply flexibility, and sub-100ps jitter performance without external compensation.

FAQ

What is the purpose of the separate VDD and VDDO pins?

VDD powers the internal logic and input receiver, while VDDO independently supplies the output drivers. This separation allows interfacing with 2.5V or 3.3V downstream devices without level shifters, reduces noise coupling between core and I/O domains, and improves jitter performance by isolating switching transients.

Can PI6C49X0204B-AWEX operate with only 2.5V on both VDD and VDDO?

No. The datasheet specifies VDD must be 3.3V ±5% (3.135–3.465V); VDDO may be either 2.5V (2.375–2.625V) or 3.3V (3.135–3.465V). Operating VDD at 2.5V violates absolute maximum ratings and will result in undefined functionality or device damage.

How is the 51kΩ input pulldown resistor used in system design?

The internal 51kΩ pulldown on the CLK pin ensures a defined logic-low state when the input is unconnected or driven by an open-drain source. It eliminates the need for external pull-down resistors in most configurations, reducing BOM count and board area-especially valuable in high-density clock tree layouts.

Does PI6C49X0204B-AWEX support spread-spectrum clocking (SSC) inputs?

No. The device is not characterized for SSC input tolerance. Its AC specifications-including skew, jitter, and duty cycle-are specified for fixed-frequency LVCMOS/LVTTL inputs. Introducing SSC may degrade output skew matching and increase additive jitter beyond guaranteed limits.