Diodes Incorporated PI6C5921516ZDIEX

Overview

PI6C5921516ZDIEX from Diodes Incorporated is a 16-output LVDS fanout buffer with differential clock distribution, 1.5 GHz max output frequency, <0.01 ps typ additive phase jitter (156.25 MHz, 12 kHz–20 MHz), and dual selectable reference inputs for single-ended or differential clock sources. It serves as a low-skew, level-shifting clock distribution IC in high-speed networking switch backplanes.

For engineers reviewing the PI6C5921516ZDIEX datasheet, PI6C5921516ZDIEX pinout, PI6C5921516ZDIEX application, or PI6C5921516ZDIEX equivalent, key selection criteria include output skew (≤50 ps), propagation delay (620–700 ps), dual VDD/VDDO supply separation, TQFN-48 thermal performance, and industrial temperature support (−40°C to +85°C).

Technical Context

This device implements a high-fidelity LVDS fanout architecture with two independent differential input channels (REF_IN0±, REF_IN1±), selectable via IN_SEL, each supporting AC-coupled or DC-coupled operation with internal bias generation (VREF_AC0/AC1). Input multiplexing is fully static and does not require clock synchronization.

The 16 LVDS output pairs (Q0± through Q15±) are driven from a common core with matched trace routing and on-die termination control, enabling sub-50 ps inter-output skew and ≤100 ps part-to-part skew. Separate VDD (core) and VDDO (output) supplies allow level translation between 2.5 V and 3.3 V domains without external level shifters.

Key Specifications

Pinout & Package

TQFN-48 (ZD package), 7 mm × 7 mm, 0.5 mm pitch, exposed thermal pad connected to GND. Designed for high-density PCB layouts with controlled impedance routing and optimal thermal dissipation in multi-layer boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT8T49N242A and Si53302-A01AGM, PI6C5921516ZDIEX uniquely delivers 16 LVDS outputs with dual-input selection, 1.5 GHz capability, and ultra-low jitter in a thermally optimized TQFN-48 package-making it optimal for high-density, multi-source clock distribution in telecom and datacom infrastructure.

Availability

PI6C5921516ZDIEX is available at Aetrix Electronics and suitable for networking switches, FPGA-based compute accelerators, optical transport line cards, and PCIe retimer reference clocking requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PI6C5921516ZDIEX 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 PI6C5921516 belongs to Diodes' Pericom timing product line, engineered specifically for low-jitter, high-output-count clock distribution in next-generation networking and high-speed serial interface applications.

FAQ

What input signal types does PI6C5921516ZDIEX support?

The device accepts differential inputs (LVDS, LVPECL) on REF_IN0± and REF_IN1±, and can also interface with single-ended CMOS clocks using external bias networks per Figure 1 in DS40080. IN_SEL selects between inputs, and open IN_SEL places all outputs in Hi-Z state. Input edge rate must be ≥1.5 V/ns for reliable operation up to 1.5 GHz.

How is power supply decoupling implemented for optimal jitter performance?

Each VDD and VDDO pin requires individual 0.1 µF ceramic + 1 µF bulk capacitor placed within 2 mm of the pin, connected directly to the power plane via dedicated vias. The thermal pad must be soldered to a solid GND plane. This layout reduces supply-induced jitter to <0.01 ps RMS, as verified in the 156.25 MHz additive jitter test condition.

Can PI6C5921516ZDIEX drive 100 Ω differential loads directly?

Yes. Each LVDS output pair is designed for 100 Ω differential termination, delivering 100–450 mV differential swing depending on frequency (≥250 mV at ≤800 MHz, ≥100 mV at ≤1.5 GHz). No external series resistors are required when driving standard LVDS receivers with internal 100 Ω termination.

What is the function of VREF_AC0 and VREF_AC1 pins?

VREF_AC0 and VREF_AC1 provide bias voltages (~1.25 V) for single-ended input configurations on REF_IN0 and REF_IN1, respectively. They source/sink ±2 mA and must be bypassed with 0.1 µF capacitors. These pins eliminate need for external resistor dividers when converting CMOS clocks to pseudo-differential inputs, simplifying board layout and improving input common-mode stability.