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PDF FXMA108 Data sheet ( Hoja de datos )
| Número de pieza | FXMA108 | |
| Descripción | 8-Bit Signal Translator | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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July 2010
FXMA108
Dual-Supply, 8-Bit Signal Translator with Configurable
Voltage Supplies and Signals Levels, 3-State Outputs
and Auto Direction Sensing
Features
Bi-Directional Interface between Two Levels from
1.65V to 5.5V
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) is Referenced to VCCA Voltage
Packaged in 20-Terminal DQFN
Direction Control Not Needed
80Mbps Throughput when Translating between
2.5V and 5.0V
ESD Protection Exceeds:
− 8kV Human Body Model (B Port I/O to GND)
(JESD22-A114 & Mil Std 883e 3015.7)
− 5kV Human Body Model (A Port I/O to GND)
(JESD22-A114 & Mil Std 883e 3015.7)
− 2kV Charged Device Model (ESD STM 5.3)
(JESD22-C101)
Description
The FXMA108 is a configurable dual-voltage supply
translator designed for both uni-directional and bi-
directional voltage translation between two logic levels.
The device allows translation between voltages as high
as 5.5V to as low as 1.65V. 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: 1.8V, 2.5V, 3.3V, and 5.0V.
The device remains in 3-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
Side by placing them in a 3-state condition. The /OE
input is supplied by VCCA.
The FXMA108 supports bi-directional translation without
the need for a direction control pin. The two sides 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
Cell Phones, PDA, Digital Camera, Portable GPS,
and Storage
Ordering Information
Part Number
Operating
Temperature Range
Package
FXMA108BQX
-40 to 85°C
20-Lead, DQFN, JEDEC MO-241, 2.5x4.5mm
Packing
Method
3000 Units
Tape and Reel
© 2010 Fairchild Semiconductor Corporation
FXMA108 • Rev. 1.0.1
www.fairchildsemi.com
1 page  
Power-Up/Power-Down Sequence
Fairchild 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 the other VCC.
Pull-Up/Pull-Down Resistors
Do not use pull-up or pull-down resistors. This device
has bus-hold circuits: pull-up or pull-down resistors are
not recommended because they interfere with the
output state. The current through these resistors may
exceed the hold drive, II(HOLD) and/or II(OD) bus-hold
currents. The bus-hold feature eliminates the need for
extra resistors.
© 2010 Fairchild Semiconductor Corporation
FXMA108 • Rev. 1.0.1
5
www.fairchildsemi.com
5 Page 
Maximum Data Rate(15, 16)
For output load, see Table 2.
VCCA
VCCA=4.5V to 5.5V
Direction
TA=-40°C to +85°C
VCCB=4.5V to VCCB=3.0V to VCCB=2.3V to
5.5V
3.6V
2.7V
VCCB=1.65V
to 1.95V
Min.
Min.
Min.
Min.
A-to-B
100
100
80
60
B-to-A
100
100
80
80
Units
VCCA=3.0V to 3.6V
VCCA=2.3V to 2.7V
A-to-B
B-to-A
A-to-B
B-to-A
100
100
80
80
100
100
80
80
80
80
60
60
60
80
Mbps
40
60
A-to-B
80
80
60
40
VCCA=1.65V to 1.95V
B-to-A
60
60
40
40
Notes:
15. Maximum data rate is guaranteed, but not tested in production.
16. Maximum data rate is specified in megabits per second with all outputs switching, (see Figure 10). It is
equivalent to two times the F-toggle frequency, specified in megahertz. For example, 100Mbps is equivalent to
50MHz.
Capacitance
TA=+25°C.
Symbol
Parameter
Conditions
Typical
CIN Input Capacitance, Control Pin /(OE) VCCA=VCCB=GND
CI/O Input / Output Capacitance
An
Bn VCCA=VCCB=5.0V, /OE=VCCA
CPD Power Dissipation Capacitance
VCCA=VCCB=5.0V, VIN=0V or VCC, f=10MHz
3
4
5
28
Unit
pF
pF
pF
© 2010 Fairchild Semiconductor Corporation
FXMA108 • Rev. 1.0.1
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet FXMA108.PDF ] | |
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