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54LVX4245J-QML データシート(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 54LVX4245J-QML
部品情報  8-Bit Dual Supply Translating Transceiver with TRI-STATE Outputs
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

54LVX4245J-QML データシート(HTML) 6 Page - National Semiconductor (TI)

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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
either 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
www.national.com
6


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