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ST7554 Datasheet(PDF) 7 Page - STMicroelectronics |
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ST7554 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 11 page UNIVERSAL SERIAL BUS INTERFACE (see Chapter 7 of USB rev 1.0 for complete Electrical Specification) Nominal DC Characteristics (D+, D-) Symbol Parameter Min. Typ. Max. Unit VDI Differential Input Sensitivity [(D+) - (D-)] 0.2 V VCM Differential Common Mode Range 0.8 2.5 V VSE Single Ended Receiver Threshold 0.8 2 V VOH VOL High Level Output Static Voltage (RL of 15k Ω to GND) Low Level Output Static Voltage (RL of 1.5k Ω to 3.6V) 2.8 3.6 0.3 V V ILO Hi-Z State Data Line Leakage Current (0V < VIN < 3.3V) ±10 µA CIN Transceiver Capacitance (Pin to GND) 20 pF RD (2) Driver Output Resistance (steady state drive) TBD TBD Ω Note 2 : Excludes external resistor. In order to comply with USB Specifications 1.0, external series resistors of 27 Ω ±1% each on D+ and D- are recommended AC Characteristics (D+, D-) (see Figure 5 for test scheme) Symbol Parameter Min. Typ. Max. Unit tDR Average bit rate (12 M/s ± 0.05%) 11.97 12.03 Mbps tR Rise Time between 10% and 90% (see Figure 6) 4 20 ns tF Fall Time 10% and 90% (see Figure 6) 4 20 ns VCRS Output Signal Crossover Voltage 1.3 2 V 1 2 15k W 50pF 15k W 50pF Test 1.5k W V REGD 27 W Test D+ D- 27 W Figure 5 : Test Scheme for D+/D- t R t F 90% 10% 90% 10% Figure 6 : Rise and Fall Time Measures ST7554 7/11 |
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