Diodes Incorporated PI6LC48P0201AZHIEX

Overview

PI6LC48P0201AZHIEX from Pericom is a 2-output LVPECL clock synthesizer optimized for Ethernet reference clock generation, featuring selectable crystal or LVCMOS/LVTTL input, 3.3V/2.5V dual supply support, and ultra-low RMS phase jitter of 0.3ps (typ) at 156.25MHz using a 25MHz crystal. It delivers precise 62.5MHz, 125MHz, and 156.25MHz outputs for high-speed networking interfaces.

For engineers reviewing the PI6LC48P0201AZHIEX datasheet, PI6LC48P0201AZHIEX pinout, PI6LC48P0201AZHIEX application, or PI6LC48P0201AZHIEX equivalent, key selection criteria include differential LVPECL output compliance, frequency select pin configuration (N_SEL[1:0]), PLL bypass capability, industrial temperature range (–40°C to +85°C), and TQFN-20 package thermal performance (θ_JA = 19.8°C/W).

Technical Context

The PI6LC48P0201AZHIEX integrates a proprietary low-phase-noise PLL with programmable feedback dividers (N_SEL[1:0]) to generate three standard Ethernet frequencies from a 25MHz fundamental-mode crystal. Its architecture separates analog (VDDA), core (VDD), and output (VDDO) power domains to isolate switching noise and preserve jitter integrity.

It supports dual clock sources via IN_SEL: crystal oscillator (XTAL_IN/XTAL_OUT) or single-ended LVCMOS/LVTTL reference (Ref_IN), with internal 51kΩ pull-downs on all control inputs (M_reset, PLL_ByPass, N_SEL[1:0]). Output skew between CLK0/CLK0# and CLK1/CLK1# is ≤35ps under matched loading.

Key Specifications

Pinout & Package

Package: 20-pin TQFN (ZH), 4mm × 4mm, 0.5mm pitch, exposed thermal pad (E-pad = GND), Pb-free & RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LVPECL clock synthesizer applications.

Compared with ICS8430I-01LFT and Si5338-A-GM, the PI6LC48P0201AZHIEX provides optimal balance of dual-LVPECL outputs, hardware-selectable Ethernet frequencies, and low-jitter performance at minimal bill-of-materials cost-ideal for cost-sensitive, high-volume networking hardware where fixed-rate timing suffices.

Availability

PI6LC48P0201AZHIEX is available at Aetrix Electronics and suitable for 10GBASE-T PHY reference clocking, network switch line card timing, and industrial Ethernet controller synchronization requiring stable component supply and long-term industrial temperature support.

Supply support for PI6LC48P0201AZHIEX 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 clock management, signal integrity, and interface solutions for networking, computing, and communications markets.

The PI6LC48P0201AZHIEX belongs to Pericom's HiFlex family-designed specifically for low-jitter, multi-output Ethernet clock generation in space-constrained, thermally demanding line-card applications.

FAQ

What is the recommended crystal specification for PI6LC48P0201AZHIEX?

The device is characterized for use with a 25MHz, 18pF parallel-resonant fundamental-mode crystal (e.g., FL2500047 or FY2500091). Minimum ESR must be ≤50Ω; shunt capacitance should be 7pF; drive level limited to 1mW. External load capacitors C1=33pF and C2=27pF are specified to minimize ppm error.

Can PI6LC48P0201AZHIEX operate with a 2.5V supply only?

Yes. The device supports full 2.5V operation across VDD, VDDA, and VDDO rails. At 2.5V, VOH is 1.1–1.6V and VOL is 0.4–0.8V under LVPECL termination; analog supply filtering requires adjusted resistor value (see Pericom Application Note AN-652 for 2.5V VDDA design).

How is output skew measured and what is its impact on system timing?

Output skew (≤35ps) is defined as timing deviation between CLK0/CLK0# and CLK1/CLK1# differential cross-points under identical loading and supply conditions. This low skew enables simultaneous sampling across multiple PHYs or framer channels without inter-channel deskew circuitry.

What happens when PLL_ByPass is asserted high?

When PLL_ByPass = '1', the internal PLL is disabled and the selected clock source (crystal or Ref_IN) passes directly to both output banks. Output frequencies match the input frequency; jitter performance reverts to that of the source-not the synthesized low-jitter output-so bypass mode is intended for debug or fail-safe operation only.