Diodes Incorporated PI6LC4833ZBIE

Overview

PI6LC4833ZBIE from Pericom Semiconductor is a high-performance clock generator IC designed for PowerPC network processors (e.g., Freescale MPC8548, MPC8572) and optimized to deliver synchronized, low-jitter clocks for CPU core, PCIe Gen1/2, SRIO, and Gigabit Ethernet MAC/PHY subsystems. It supports 25 MHz crystal or differential input, delivers up to 16 outputs across HCSL, LVCMOS, LVPECL, and CMOS formats, and achieves 0.5 ps RMS integrated phase jitter at 3.3 V.

For engineers reviewing the PI6LC4833ZBIE datasheet, PI6LC4833ZBIE pinout, PI6LC4833ZBIE application, or PI6LC4833ZBIE equivalent, key selection criteria include multi-format output flexibility (HCSL/LVPECL/LVCMOS), spread-spectrum control (SS0/SS1), PLL bypass mode for test, industrial temperature range (–40°C to +85°C), and TQFN-56 package compatibility with dense PCB layouts.

Technical Context

The PI6LC4833ZBIE integrates two independent PLLs - a ring-based PLL1 (VDDA1) for primary clock synthesis and an LC-based PLL2 (VDDA2) for ultra-low-noise generation - enabling simultaneous high-frequency, low-jitter outputs. Input selection is managed via IN_SEL, supporting either crystal (X1/X2) or differential (IN+/IN−) sources with internal 100 kΩ pull-up/down resistors.

Output banks are digitally configurable: FA0/FA1 select QA bank HCSL frequencies (100/125/200/250 MHz); FB0/FB1 set QB LVCMOS outputs (33.33/50/66.67/100 MHz); Sel_Freq1–Sel_Freq3 and SS0/SS1 enable per-bank frequency, spread-spectrum, and voltage-mode (2.5 V/3.3 V via VSEL_33) control. All output enables (OC_A–OC_R) feature internal 100 kΩ pull-downs.

Key Specifications

Pinout & Package

PI6LC4833ZBIE is housed in a 56-pin Thin Quad Flat No-lead (TQFN) package (code ZB), with 0.5 mm pitch and an exposed thermal pad (EPAD) connected to GND for enhanced thermal performance. The package complies with JEDEC MO-137 AE and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT8T49N242A and Si5338A-B-GM, the PI6LC4833ZBIE offers hardware-configured, zero-software multi-format clock distribution ideal for fixed-function PowerPC-based networking hardware where reliability, low jitter, and deterministic startup behavior are critical.

Availability

PI6LC4833ZBIE is available at Aetrix Electronics and suitable for router/switch platforms, OLT/BSC infrastructure, WLAN gateways, and wireless backhaul systems requiring stable component supply, long-lifecycle support, and industrial-grade thermal performance.

Supply support for PI6LC4833ZBIE 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-speed timing, signal integrity, and interface solutions for communications and computing markets.

The PI6LC4833 belongs to Pericom's LC-based clock generator product line, engineered specifically for PowerPC-based network processors and high-reliability telecom infrastructure demanding ultra-low jitter and multi-protocol clock distribution.

FAQ

What input configurations does the PI6LC4833ZBIE support?

The PI6LC4833ZBIE accepts either a 25 MHz parallel-resonant crystal (via X1/X2 pins) or a differential clock signal (HCSL/LVPECL/LVDS) on IN+/IN−. Input selection is controlled by the IN_SEL pin, which defaults to differential mode due to its internal 100 kΩ pull-up resistor. Crystal load capacitance is optimized for CL = 18 pF using external C1 = 27 pF and C2 = 33 pF.

How is output frequency selected for the QA and QB banks?

QA bank (HCSL outputs QA0±–QA3±) frequency is set by FA0 and FA1 pins: 00 = 100 MHz, 01 = 125 MHz, 10 = 200 MHz, 11 = 250 MHz. QB bank (LVCMOS outputs QB0/QB1) uses FB0/FB1: 00 = 33.33 MHz, 01 = 66.67 MHz, 10 = 100 MHz, 11 = 50 MHz. Both sets have built-in pull-down (FA0/FA1) or pull-up (FB0/FB1) resistors for default state assurance.

What is the function of the PLL_BYPS pin and when should it be used?

The PLL_BYPS pin (Pin 37) controls whether output buffers are driven by the PLL output (low) or directly from the input mux (high). In PLL bypass mode (high), the device routes the selected input (crystal or differential) straight to outputs - enabling functional verification, jitter measurement of the raw source, or system bring-up before PLL lock is achieved. It features an internal 100 kΩ pull-down resistor.

Does the PI6LC4833ZBIE support spread-spectrum clocking, and how is it configured?

Yes, spread-spectrum clocking is supported for QA and QB banks via SS0 and SS1 pins. Configuration is hardware-based: SS1/SS0 = 00 → ±0.25%, 01 → –0.5%, 10 → –0.75%, 11 → no spread. Both pins have internal 100 kΩ pull-up resistors, so floating them defaults to no spread. This feature reduces electromagnetic interference in densely packed telecom and networking PCBs.