问题：
USB port voltage specifications for KUSB-3100 Series
答案：
Product(s):
USB Modules: KUSB-3100 Series: KUSB-3100, KUSB-3102, KUSB-3108, KUSB-3116, KUSB-3160
Question:How is the USB port supply voltage specified?What is the minimum supply voltage for the PC USB port?What is the minimum supply voltage for the KUSB-3100 Series modules?
Answer:The High Power USB Port voltage must be between +4.75 to +5.25 volts.These are the specified requirements for the KUSB-3100 Series modules.The modules have been tested from 4.65V to 5.5V without any problems.In most cases the module will start down to 4.5V. However, it could be a problem with the series switch impedance on some laptops. The KUSB-3100 Series modules will typically use less than 400mA of the 500mA specification.
Copyright 2003, Keithley Instruments, Inc.
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