Diodes Incorporated PI6C59S6005ZDIEX

Overview

PI6C59S6005ZDIEX from Diodes Incorporated is a high-performance 1-to-5 differential clock fanout buffer supporting up to 6 GHz input frequency, 5 LVPECL/CML output pairs, <0.05 ps max additive jitter, and dual supply options (3.3 V ±10% or 2.5 V ±5%). It serves as a low-skew clock distribution IC in high-speed serial interfaces such as PCIe Gen4/5 reference clock trees.

For engineers reviewing the PI6C59S6005ZDIEX datasheet, PI6C59S6005ZDIEX pinout, PI6C59S6005ZDIEX application, or PI6C59S6005ZDIEX equivalent, key selection criteria include input compatibility with LVPECL/LVDS/CML/SSTL, selectable output type (LVPECL vs CML), internal AC-coupling biasing via VREF-AC, and thermal performance under industrial temperature range (–40°C to +85°C).

Technical Context

The PI6C59S6005ZDIEX implements a fully differential, single-input clock buffer with synchronous enable (EN) and configurable input selection (IN0/IN1), type select (TS), and output format control (OS). Its architecture supports both DC- and AC-coupled inputs using internal termination and VREF-AC reference generation.

It features five independent differential output pairs (Q0+/- through Q4+/-), each capable of LVPECL or CML signaling depending on OS pin state, with output-to-output skew <20 ps and device-to-device skew ≤200 ps. Propagation delay is 400 ps with 240 ps setup/hold timing margins.

Key Specifications

Pinout & Package

Package: 24-pin Very Thin Quad Flat No-Lead (TQFN), 3.5 mm × 3.5 mm × 0.55 mm body, ePad grounded for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT8T49N242A and NB3N551, the PI6C59S6005ZDIEX uniquely balances 6 GHz bandwidth, dual-supply flexibility, integrated AC-coupling bias, and 5-output LVPECL/CML configurability-making it optimal for compact, high-density, multi-standard clock distribution without added PLL complexity or voltage limitations.

Availability

PI6C59S6005ZDIEX is available at Aetrix Electronics and suitable for PCIe Gen5 reference clock distribution, 100G Ethernet SerDes timing, and multi-core processor clock tree applications requiring stable component supply, consistent lead-time visibility, and long-term industrial lifecycle support.

Supply support for PI6C59S6005ZDIEX 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 and mixed-signal solutions for industrial, computing, communications, and consumer markets.

The PI6C59S6005 belongs to Diodes' Pericom® clock management product line, engineered specifically for ultra-low-jitter, high-frequency clock distribution in next-generation data center, telecom infrastructure, and high-speed interface applications.

FAQ

What input standards does the PI6C59S6005ZDIEX support?

The PI6C59S6005ZDIEX accepts LVPECL, LVDS, CML, and SSTL input levels on its REF_IN0 and REF_IN1 differential pairs. Both AC- and DC-coupled configurations are supported, with internal 100 Ω differential termination and VREF-AC output enabling robust AC-coupled operation without external bias networks.

How is output format selected between LVPECL and CML?

Output format is controlled by the OS pin (Pin 21): logic high configures all five output pairs for LVPECL signaling (VOH ≈ VDD − 1.15 V, VOL ≈ VDD − 1.95 V), while logic low selects CML mode (VDIFF_OUT ≈ 650–800 mV). This single-pin configuration eliminates need for per-output level-shifting components.

Can unused input pins be left floating?

REF_IN0+/− and REF_IN1+/− may be left floating if unused, though Diodes recommends connecting unused REF_INx− pins to GND via 1 kΩ resistors for improved noise immunity. Control pins (EN, IS, TS, OS) have internal 25 kΩ pull-up resistors but benefit from external 4.7 kΩ pull-up/1 kΩ pull-down for robust LVCMOS-level reliability.

What is the recommended termination for LVPECL outputs?

The preferred LVPECL termination is a 150 Ω pull-down to ground at the buffer output, combined with a 100 Ω differential load at the receiver end. This avoids VDD bias current flow onto clock traces, minimizing supply noise coupling. External 100 Ω termination should be omitted if the receiving ASIC already integrates equivalent differential termination.