Diodes Incorporated PI6C49X0208ZHIEX

Overview

PI6C49X0208 from Diodes Incorporated is a high-performance, multi-voltage 1:8 CMOS fanout buffer with integrated crystal oscillator circuitry. It distributes low-jitter clock signals across eight single-ended outputs (CLK0–CLK7), supports selectable reference inputs (XTAL, IN0/IN0#, IN1/IN1#), operates at up to 200 MHz output frequency, and enables mixed-voltage output banks (1.2V to 3.3V) with core supply at 2.5V or 3.3V. It is used in high-speed networking switch clock distribution.

For engineers reviewing the PI6C49X0208 datasheet, PI6C49X0208 pinout, PI6C49X0208 application, or PI6C49X0208 equivalent, key selection criteria include additive jitter (0.01 ps typ), output skew (≤80 ps), input mode selection logic (IN_SEL[0:1]), enable-controlled output state, and multi-supply VDDO bank configuration for heterogeneous SoC interfaces.

Technical Context

The device integrates a fundamental-mode crystal oscillator (10–50 MHz) with dual differential/single-ended reference inputs (IN0/IN0#, IN1/IN1#), selectable via IN_SEL[0:1] pins using VDD/2 threshold logic. Input multiplexing is synchronous and glitch-free, with MUX isolation ≥53 dB at 150–155.52 MHz.

Each of the eight CMOS outputs is independently powered by user-configurable VDDO rails-supporting mixed 3.3V/2.5V/1.8V/1.5V/1.2V output domains while maintaining core VDD at 2.5V or 3.3V. Output enable (ENABLE) asserts high-impedance state synchronously with ≤6 clock cycles latency.

Key Specifications

Pinout & Package

Package: 32-pin W-QFN5050 (ZH), 5.0 mm × 5.0 mm, 0.5 mm pitch, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-voltage clock fanout applications.

Compared with IDT8T49N242A and Si53302-B-GM, the PI6C49X0208 delivers lower system-level jitter (0.01 ps additive) without external components or configuration overhead, making it optimal for fixed-frequency, low-latency, multi-voltage clock distribution in cost- and space-sensitive networking hardware.

Availability

PI6C49X0208 is available at Aetrix Electronics and suitable for networking switches, telecom backplanes, optical transport line cards, and industrial edge compute platforms requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PI6C49X0208 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 PI6C49X0208 belongs to Diodes' Precision Timing product line, designed specifically for low-jitter, multi-voltage clock distribution in high-speed data infrastructure where signal integrity and power-domain flexibility are critical.

FAQ

What crystal specifications are supported by the PI6C49X0208 internal oscillator?

The PI6C49X0208 supports fundamental-mode crystals from 10 MHz to 50 MHz, with 18 pF load capacitance, ≤50 Ω equivalent series resistance (ESR), and 1 mW drive level. The crystal must be placed adjacent to XIN/XOUT pins with minimal trace length and proper grounding per the layout guidelines in DS45889 Rev 1-2.

Can CLK0–CLK7 operate at different voltages simultaneously?

Yes. The PI6C49X0208 supports mixed-output-voltage operation: CLK0–CLK3 may be powered by VDDO1 (e.g., 1.8V), while CLK4–CLK7 use VDDO2 (e.g., 2.5V), provided each VDDO pin is supplied at the intended voltage and decoupled locally. This enables direct interfacing with heterogeneous I/O standards on a single board.

How does the IN_SEL[0:1] logic determine the active reference input?

IN_SEL[0:1] uses VDD/2 threshold detection: '11' or '01' selects the internal crystal (XIN/XOUT); '10' selects IN1/IN1#; '00' selects IN0/IN0#. Inputs are sampled synchronously with the selected reference, and switching occurs only after stable lock is achieved to prevent glitches.

Is the ENABLE pin asynchronous or synchronous?

The ENABLE pin is synchronous: output enable/disable transitions occur on the next rising edge of the selected reference clock after ENABLE changes state, with guaranteed latency of ≤6 clock cycles. This prevents runt pulses and ensures deterministic timing behavior in synchronous systems.