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54LVXC3245 Scheda tecnica(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte 54LVXC3245
Spiegazioni elettronici  8-Bit Dual Supply Configurable Voltage Interface
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

54LVXC3245 Scheda tecnica(HTML) 6 Page - National Semiconductor (TI)

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Configurable I/O Application for mixed or unknown Voltages
LVXC3245 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 LVXC3245 configures two different
output levels to handle the dual supply interface issues. The
“A” port is a dedicated 3V port to interface 3V ICs. The “B”
port is configurable and accepts a 3V-to-5V supply level.
This configurable
″B″ port provides maximum flexibility for in-
terfacing to unknown supply voltages, for interfacing to sup-
ply voltages which may change in the future, or for providing
flexibility when supplying systems to multiple customers with
varying power supply requirements.
Figure 1 shows how the
LVXC3245 fits into a system with a 3V subsystem and a 5V
subsystem.
DS101032-3
FIGURE 1. LVXC3245 Fits into a System with 3V Subsystem and 5V Subsystem
www.national.com
6


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