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Document Reference No.: FT_000120
USB to RS485 UART Serial Converter PCB Datasheet
Version 1.2
Clearance No. FTDI#80
4.2 USB-RS485-PCB Electrical Parameters
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
The range is dependent on
VCC_5V
Output Power Voltage
4.25
5.0
5.25
V
the USB port that the USB-
RS485-PCB is connected to.
C
I O
T
Output Power Current
Operating Temperature
Range
-
-40
250
+85
mA
o
Must be less than 2.5mA
during suspend.
Table 4.2 USB-RS485-PCB
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Receiver Input
VCM
Common-mode input
voltage range
-7
+12
V
1.0
VIN = +12V
IN
Input Current
– 0.8
mA
VIN = – 7V
VTH
VIHYST
RIN
Differential Threshold
Voltage,VTH
Input Hysteresis
Input Resistance, RIN
-0.2
12
20
15
+0.2
V
mV
kΩ
Transmitter Output
VOD
Differential Output Voltage,
dVOD
1.5
5
V
With RL = 54 Ω. CL = 50pF *
Table 4.4 USB-RS485-PCB I/O Pin Characteristics
* - The 54 ohms is the equivalent of two 120 ohm termination resistors placed on each side of the
transmission line and the input impedance of 32 receivers on the line.
Note: The VCC_5V output is switched by a transistor on the USB-RS485-PCB. This transistor will enable
the VCC_5V output when the device is enumerated (it will disable the VCC_5V output when in USB
suspend mode).
Copyright ? 2011 Future Technology Devices International Limited
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