nlsx5011 ON Semiconductor, nlsx5011 Datasheet - Page 10

• Manufacturer Part Number: nlsx5011
• Description: Nlsx5011 1-bit 100 Mb/s Configurable Dual-supply Level Translator
• Manufacturer: ON Semiconductor

Level Translator Architecture
bi−directional logic voltage level shifting to transfer data
in multiple supply voltage systems. These level translators
have two supply voltages, V
levels on the input and output sides of the translator. When
used to transfer data from the I/O V
input signals referenced to the V
output signals with a logic level matched to V
similar manner, the I/O V
input signals with a logic level compatible to V
output signal matched to V
channels that independently determine the direction of the
data flow without requiring a directional pin. One−shot
circuits are used to detect the rising or falling input signals.
In addition, the one−shots decrease the rise and fall times
of the output signal for high−to−low and low−to−high
transitions.
Input Driver Requirements
wide bandwidth, but a relatively small DC output current
rating. The high bandwidth of the bi−directional I/O circuit
is used to quickly transform from an input to an output
driver and vice versa. The I/O ports have a modest DC
current output specification so that the output driver can be
over driven when data is sent in the opposite direction. For
proper operation, the input driver to the auto−sense
translator should be capable of driving 2 mA of peak output
current. The bi−directional configuration of the translator
results in both input stages being active for a very short time
period. Although the peak current from the input signal
circuit is relatively large, the average current is small and
consistent with a standard CMOS input stage.
Enable Input (EN)
provides tri−state operation at the I/O pins. Driving the
Enable pin to a low logic level minimizes the power
consumption of the device and drives the I/O V
The
The NLSX5011 translator consists of bi−directional
Auto−sense translators such as the NLSX5011 have a
The NLSX5011 translator has an Enable pin (EN) that
NLSX5011
auto−sense
CC
L
L
.
and V
to I/O V
L
supply are translated to
IMPORTANT APPLICATIONS INFORMATION
CC
L
translator
to the I/O V
, which set the logic
L
translation shifts
CC
CC
provides
CC
CC
and I/O
http://onsemi.com
. In a
ports,
to an
10
V
operation occurs when the EN pin is equal to a logic high
signal. The EN pin is referenced to the V
Over−Voltage Tolerant (OVT) protection.
Uni−Directional versus Bi−Directional Translation
non−inverting uni−directional translator. One advantage of
using the translator as a uni−directional device is that each
I/O pin can be configured as either an input or output. The
configurable input or output feature is especially useful in
applications such as SPI that use multiple uni−directional
I/O lines to send data to and from a device. The flexible I/O
port of the auto sense translator simplifies the trace
connections on the PCB.
Power Supply Guidelines
anywhere between 0.9 and 4.5 V. Design flexibility is
maximized because V
than the V
competitive auto sense translators has a restriction that the
value of the V
0.4) V.
the device during power−up operation. In addition, the I/O
V
either supply voltage is equal to 0 V. For optimal
performance, 0.01 to 0.1 mF decoupling capacitors should
be used on the V
capacitors are a good design choice to filter and bypass any
noise signals on the voltage lines to the ground plane of the
PCB. The noise immunity will be maximized by placing
the capacitors as close as possible to the supply and ground
pins, along with minimizing the PCB connection traces.
that provides design flexibility. The output ports are
disabled when either power supply is off (V
This feature causes all of the I/O pins to be in the power
saving high impedance state.
L
CC
The
The values of the V
The sequencing of the power supplies will not damage
The NLSX5011 translators have a power down feature
pins to a high impedance state. Normal translation
and I/O V
NLSX5011
CC
L
supply. In contrast, the majority of the
L
supply must be equal to less than (V
pins are in the high impedance state if
L
and V
L
translator
L
may be either greater than or less
and V
CC
power supply pins. Ceramic
CC
can
supplies can be set to
function
L
L
supply and has
or V
CC
= 0 V).
as
CC
−
a