Datasheet > VSC8201

VSC8201

更新时间： 2022-02-26 13:00:02

品牌	Logo	应用领域
VITESSE		局域网（LAN）标准
页数	文件大小	规格书
21页	484K
描述
Single Port 10/100/1000BASE-Tand 1000BASE-X PHY

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VSC8201 数据手册

SimpliPHY VSC8201

PCB Design and Layout Guide

Single Port 10/100/1000BASE-Tand 1000BASE-X PHY

Introduction

This purpose of this application note in conjunction with the VSC8201 Datasheet is to provide information to assist in the design and lay-

out of the VSC8201 Gigabit Ethernet Transceiver.

Power Supply Organization and Decoupling

The VSC8201 requires a 3.3v and a 1.5v power supply source for operation using GMII, MII or TBI MAC interfaces. In RGMII and RTBI

modes, an additional 2.5v supply is needed as specified by the RGMI/RTBI standard. The VSC8201 can be powered using the following

options:

•

2 separate supplies, 3.3v and 1.5v respectively.

A single 3.3v supply. This is done by using the optional on-chip regulator control circuit, which drives a simple external series pass

type supply regulator (MOSFET) to generate the 1.5v core power supply.

PCB Power Plane Organization

It is recommended that the PCB power plane(s) in a system be divided into four separate regions:

Table 1: Power Supply Plane Regions

Description

Current

PCB Power

Plane

Nominal

LQFP Supply Names

VDDIO

Supply Voltage

Typ

Max

V+IO

Digital Input/Output

buffer supply

3.3v/2.5v

3.3v

8mA

11mA

V+A33

V+A15

V+DIG

Filtered analog 3.3v

supply

101mA

41mA

111mA

48mA

423mA

TXVDD, VDDREC33,

VDDPLL33

Filtered analog 1.5v

supply

1.5v

VDDREC15, VDDPLL15

Digital core supply

1.5v

350mA

VDDDIG

a. Test conditions: Room temperature (25^oC), 1000BASE-T data, full duplex, minimum IPG, 64-byte packets, RGMII MAC active, excluding

regulator power dissipation but including external twisted pair termination; all worst case current figures have all nominal power supplies

scaled by +5%.

b. Refer VSC8201 Datasheet to correlate supply names with part pin numbers.

Power Supply Filtering and Decoupling

For best performance, each power supply region should contain capacitors for both bulk decoupling and for local high-frequency decou-

pling. This is summarized in the following tables:

Rev. 1.6.3 - 9/29/04

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