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数据搜索系统，热门电子元器件搜索 |
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9202 数据表(PDF) 98 Page - STMicroelectronics |
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9202 数据表(HTML) 98 Page - STMicroelectronics |
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98 / 175 page  UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV 98/175 External USB Pull-Up Resistor The USB system specifies a pull-up resistor on the D- pin for low-speed peripherals. The USB Spec 1.1 describes a 1.5k Ω pull-up resistor to a 3.3V supply. An approved alternative method is a 7.5k Ω pull-up to the USB VCC supply. This alterna- tive is defined for low-speed devices with an inte- grated cable. The chip is specified for the 7.5k Ω pull-up. This eliminates the need for an external 3.3V regulator, or for a pin dedicated to providing a 3.3V output from the chip. Figure 46. USB Data Signal Timing and Voltage Levels Figure 47. Receiver Jitter Tolerance AI06631 VCR D- D+ tR tF 10% 90% 90% 10% VOH VOL AI06632 TJR TJR1 TJR2 Consecutive Transitions N*TPERIOD+TJR1 TPERIOD Paired Transitions N*TPERIOD+TJR2 Differential Data Lines |
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