A. Specifications
Specifications at 25 degrees C and Vusb/Vext = 5.0V, except where noted.
Parameter Conditions Min Typical Max Units
General
USB Cable Length 5 meters
Supply Voltage 4.0 5.0 5.25 volts
Supply Current (1) Hardware V1.21 50 mA
Operating Temperature -40 85 °C
Clock Error -40 to 85 °C 1.5 %
Typ. Command Execution Time (2) USB high-high 0.6 ms
USB other 4 ms
s Outputs
Typical Voltage (3) Self-Powered 4.75 5.0 5.25 volts
Bus-Powered 4.0 5.0 5.25
Maximum Current (3) Self-Powered 450 mA
Bus-Powered 50 mA
(1) Typical current drawn by the U3 itself, not including any user connections.
(3) These specifications are related to the power provided by the host/hub. Self- and bus-powered describes the host/hub, not
the U3. Self-powered would apply to USB hubs with a power supply, all known desktop computer USB hosts, and some
notebook computer USB hosts. An example of bus-powered would be a hub with no power supply, or many PDA ports. The
current rating is the maximum current that should be sourced through the U3 and out of the Vs terminals.
(2) Total typical time to execute a single Feedback function with no analog inputs. Measured by timing a Windows application
that performs 1000 calls to the Feedback function. See Section 3.1 for more timing information.
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