74LVX4245QSC datasheet(6/8 Pages) NSC

Nome de Peças	74LVX4245QSC

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 3V5V interfacing issues

when CMOS devices cannot tolerate IO levels above their

applied VCC If an IO pin of 3V ICs is driven by 5V ICs the

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

flow from IO bus to the 3V power supply The resulting high

current flow can cause destruction of 3V ICs through latch-

up effects To prevent this problem a current limiting resis-

tor 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 1 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 74 series 245 as

shown in

Figure 2 the designer could use this device in

either a 3V system or a 5V system without any further work

to re-layout the board

TLF11540 – 4

FIGURE 2 LVX4245 Pin Arrangment is Compatible to

20-Pin 74 Series 245

TLF11540 – 5

FIGURE 1 LVX4245 Fits into a System with 3V Subsystem and 5V Subsystem

6

Nº de peça semelhante - 74LVX4245QSC

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Fairchild Semiconductor	74LVX4245QSC	86Kb / 8P	8-Bit Dual Supply Translating Transceiver with 3-STATE Outputs
Fairchild Semiconductor	74LVX4245QSCX	86Kb / 8P	8-Bit Dual Supply Translating Transceiver with 3-STATE Outputs

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