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AN-5001

更新时间： 2024-11-14 12:20:15

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		/
页数	文件大小	规格书
3页	31K
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LVX Low Voltage Dual Supply CMOS Translating Transceivers

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AN-5001 数据手册

Fairchild Semiconductor

Application Note

April 1998

AN-5001

Revised May 1999

Using Fairchild’s LVX Low Voltage

Dual Supply CMOS Translating Transceivers

INTRODUCTION

On the 74LVX4245 Figure 2, V_CCAand the A I/O port are

the 5V side (4.5V to 5.5V) and the V_CCBand the B I/O are

the 3V side (2.7V to 3.6V).

The Fairchild

CMOS

Translating

Transceivers:

74LVX3245, 74LVX4245, 74LVXC3245, and 74LVXC4245

are true voltage translating devices. This is accomplished

by electrically isolating the A-side from the B-side.

An example of when it is necessary to use a true voltage

translator, is in a system translating between 3 volt logic

and 5 volt CMOS logic. In this case, the translators will

insure a clean, fast and valid V_IH(Voltage Input High) sig-

nal in both directions. This translation may be problematic

with other forms of translation due to the V_IHrequired, typi-

cally 3.5V for 5V CMOS.

DEVICE TYPE DESCRIPTIONS

The LVX Translating Transceivers are divided into two

types of devices, Dual Supply Translating Transceivers,

and Dual Supply Configurable Voltage Interface Transceiv-

ers. These devices offer the system designer multiple

options for true voltage level translation in a system.

FIGURE 2. 74LVX4245

CONFIGURABLE VOLTAGE INTERFACE

TRANSCEIVERS

DUAL SUPPLY TRANSLATORS

The

Configurable

Voltage

Interface

transceivers

The Dual Supply Translator devices (74LVX3245 and

74LVX4245) are designed to interface 3 volt to 5 volt sig-

nals. The Transmit/Receive control pin controls data direc-

tion flow. These devices are designed with the higher

voltage V_CCable to swing from 4.5V to 5.5V and the lower

(74LVXC3245 and 74LVXC4245) are designed for real

time configurable I/O applications such as PCMCIA (Per-

sonal Computer Memory Card Interface Association).

Configurability simply means the device is designed with

the ability of the “configurable” side of the I/O port, to track,

or follow the V_CCBvoltage level. This is accomplished by

voltage V_CCable to swing from 2.7V to 3.6V. The control

pins OE (Output Enable) and T/R (Transmit/Receive) are

tying V_CCBof the device to the PCMCIA card voltage sup-

ply. The card will always experience full rail data signals,

maximizing interface reliability.

The 74LVX3245 and 74LVX4245 provide the same 5V to

3V translation function. The difference between the two

devices is the side of the device the 5V and 3V V_CC’s and

The control pins OE (Output Enable) and T/R (Transmit/

Receive) are powered by the V_CCAside of the device.

their associated I/O (Input/Outputs data) ports are on.

In the case of the 74LVX3245 Figure 1, V_CCBand the B

I/O port are the 5V side (4.5V to 5.5V) and the V_CCAand

the A I/O port are the 3V side (2.7V to 3.6V).

These devices are also designed to allow the configurable

side (V_CCBand B I/O port) to float, unconnected to any

voltage or control source. This is allowed when the OE pin

is driven to a logic high.

Floating V_CCBand the B port is useful in applications where

a card or cable may need to be left disconnected. Using a

Configurable Voltage Interface device at this point will elim-

inate false signaling or system damage due to the oscilla-

tions that can occur if standard design CMOS inputs and

power pins are left floating.

The 74LVXC3245 and 74LVXC4245 are designed for dif-

ferent V_CCAand A I/O port voltage levels.

FIGURE 1. 74LVX3245

AN500148.prf

www.fairchildsemi.com

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