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USBUF01W6 Datasheet(PDF) 8 Page - STMicroelectronics |
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USBUF01W6 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 11 page Technical information USBUFxxW6 8/11 2.6 Transition times This low pass filter has been designed in order to meet the USB 1.1 standard requirements that implies the signal edges are maintained within the 4 -20 ns stipulated USB specification limits. To verify this point, we have measured the rise time of VD+ voltage with and without the USBUFxxW6 device. Figure 14. shows the circuit used to perform measurements of the transition times. In Figure 15., we see the results of such measurements: trise = 3.8 ns driver alone trise = 7.8 ns with protection device The adding of the protection device causes the rise time increase of roughly 4ns. Note: Rise time has been measured between 10% and 90% of the signal (resp. 90% and 10%) Figure 14. Typical rise and fall times: measurement configuration Figure 15. Typical rise times with and without protection device D+ D- +5V +5V 74HC04 +5V Square Pulse Generator 74HC04 USBDF 01W6 without with |
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