54LVX4245W-QML datasheet(6/8 Pages) NSC

Nome de Peças	54LVX4245W-QML

Descrição Electrónicos	8-Bit Dual Supply Translating Transceiver with TRI-STATE Outputs

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Fabricante Electrônico	NSC [National Semiconductor (TI)]

Página de início	http://www.national.com

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Applications: Mixed Mode Dual Supply Interface Solution

LVX4245 is designed to solve 3V/5V interfacing issues when

CMOS devices cannot tolerate I/O levels above their applied

V

CC. If an I/O pin of 3V ICs is driven by 5V ICs, the

P-Channel transistor in 3V ICs will conduct causing current

flow from I/O bus to the 3V power supply. The resulting high

current flow can cause destruction of 3V ICs through latchup

effects. To prevent this problem, a current limiting resistor is

used typically under direct connection of 3V ICs and 5V ICs,

but it causes speed degradation.

In a better solution, the LVX4245 configures two different

output levels to handle the dual supply interface issues. The

“A” port is a dedicated 5V port to interface 5V ICs. The “B”

port is a dedicated port to interface 3V ICs.

Figure 2 shows

how LVX4245 fits into a system with 3V subsystem and 5V

subsystem.

This device is also configured as an 8-bit 245 transceiver,

giving the designer TRI-STATE capabilities and the ability to

select either bidirectional or unidirectional modes. Since the

center 20 pins are also pin compatible to 54 series 245, as

shown in

Figure 1, the designer could use this device in ei-

ther a 3V system or a 5V system without any further work to

re-layout the board.

DS101021-4

FIGURE 1. LVX4245 Pin Arrangement is Compatible to

20-Pin 54 Series 245

DS101021-5

FIGURE 2. LVX4245 Fits into a System with 3V Subsystem and 5V Subsystem

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54LVX4245W-QML Folha de dados(PDF) 6 Page - National Semiconductor (TI)

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