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Número de pieza | FXLA108 | |
Descripción | Low-Voltage Dual-Supply 8-Bit Voltage Translator | |
Fabricantes | Fairchild Semiconductor | |
Logotipo | ||
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FXLA108
Low-Voltage Dual-Supply 8-Bit Voltage Translator with
Configurable Voltage Supplies and Signal Levels,
3-State Outputs, and Auto Direction Sensing
Features
Bi-Directional Interface between Two Levels:
from 1.1V to 3.6V
Fully Configurable: Inputs and Outputs Track VCC
Non-Preferential Power-Up; Either VCC May Be
Powered Up First
Outputs Remain in 3-State Until Active VCC Level is
Reached
Outputs Switch to 3-State if Either VCC is at GND
Power-Off Protection
Bus-Hold on Data Inputs Eliminates the Need for
Pull-Up Resistors
Control Input (/OE) Referenced to VCCA Voltage
Packaged in 20-Terminal DQFN (2.5mm x 4.5mm)
Direction Control Not Necessary
100Mbps Throughput when Translating Between
www.DataSheet41U..8cVomand 2.5V
ESD Protection Exceeds:
- 8kV HBM
(per JESD22-A114 &Mil Std 883e 3015.7)
- 2kV CDM (per ESD STM 5.3)
Description
The FXLA108 is a configurable dual-voltage supply
translator for both uni-directional and bi-directional
voltage translation between two logic levels. The device
allows translation between voltages as high as 3.6V to
as low as 1.1V. The A port tracks the VCCA level and the
B port tracks the VCCB level. This allows for bi-directional
voltage translation over a variety of voltage levels: 1.2V,
1.5V, 1.8V, 2.5V, and 3.3V.
The device remains in three-state until both VCCs reach
active levels, allowing either VCC to be powered up first.
Internal power-down control circuits place the device in
3-state if either VCC is removed.
The /OE input, when HIGH, disables both the A and B
ports by placing them in a 3-state condition. The /OE
input is supplied by VCCA.
The FXLA108 supports bi-directional translation without
the need for a direction control pin. The two ports of the
device have auto-direction sense capability. Either port
may sense an input signal and transfer it as an output
signal to the other port.
Applications
Laptops, Notebooks,
Routers, Switches
Ordering Information
Part Number
FXLA108BQX
Operating
Temperature
Range
-40 to 85°C
Eco
Status
Package
Packing
Method
Green 20-Terminal DQFN 2.5mm x 4.5mm Package Tape and Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FXLA108 • Rev. 1.0.0
www.fairchildsemi.com
1 page Power-Up/Power-Down Sequence
FXL translators offer an advantage in that either VCC
may be powered up first. This benefit derives from the
chip design. When either VCC is at 0V, outputs are in a
high-impedance state. The control input (/OE) is
designed to track the VCCA supply. A pull-up resistor
tying /OE to VCCA should be used to ensure that bus
contention, excessive currents, or oscillations do not
occur during power-up or power-down. The size of the
pull-up resistor is based upon the current-sinking
capability of the device driving the /OE pin.
The recommended power-up sequence is:
1. Apply power to the first VCC.
2. Apply power to the second VCC.
3. Drive the /OE input LOW to enable the device.
The recommended power-down sequence is:
1. Drive /OE input HIGH to disable the device.
2. Remove power from either VCC.
3. Remove power from other VCC.
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© 2009 Fairchild Semiconductor Corporation
FLXA108 • Rev. 1.0.0
5
www.fairchildsemi.com
5 Page Maximum Data Rate(13, 14)
TA=-40 to 85°C.
VCCA
VCCB=3.0V
to 3.6V
Min.
VCCB=2.3V
to 2.7V
Min.
VCCB=1.65V
to 1.95V
Min.
VCCB=1.4V
to 1.6V
Min.
VCCB=1.1V to
1.3V
Typ.
Units
VCCA=3.00V to 3.60V
140
120
100
VCCA=2.30V to 2.70V
120
120
100
VCCA=1.65V to 1.95V
100
100
80
VCCA=1.40V to 1.60V
80
80
60
80
80
60
60
40 Mbps
40 Mbps
40 Mbps
40 Mbps
VCCA=1.10V to 1.30V
Typ.
40
Typ.
40
Typ.
40
Typ.
40
Typ.
40
Mbps
Notes:
13. Maximum data rate is guaranteed, but not tested.
14. Maximum data rate is specified in megabits per second (see Figure 9). It is equivalent to two times the F-toggle
frequency, specified in megahertz. For example, 100Mbps is equivalent to 50MHz.
Capacitance
Symbol
CIN
CI/O
Cpd
Parameter
Input Capacitance Control Pin (/OE)
Input/Output Capacitance
An
Bn
Power Dissipation Capacitance
Conditions
VCCA=VCCB=GND
VCCA=VCCB=3.3V, /OE=VCCA
VCCA=VCCB=3.3V, VI=0V or VCC, f=10MHz
TA=+25°C
Typical
3
4
5
25
Units
pF
pF
pF
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© 2009 Fairchild Semiconductor Corporation
FLXA108 • Rev. 1.0.0
11
www.fairchildsemi.com
11 Page |
Páginas | Total 16 Páginas | |
PDF Descargar | [ Datasheet FXLA108.PDF ] |
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