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FT121Q-R 数据表(PDF) 36 Page - Future Technology Devices International Ltd. |
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FT121Q-R 数据表(HTML) 36 Page - Future Technology Devices International Ltd. |
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36 / 46 page ![]() Copyright © 2014 Future Technology Devices International Limited 36 Document No.: FT_000648 FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC Datasheet Version 1.2 Clearance No.: FTDI# 312 Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 1.62 V I source = 4mA Vol Output Voltage Low 0.4 V I sink = 4mA Vih Input Voltage High 1.17 V Vil Input Voltage Low - 0.63 V Table 8.5 digital I/O Pin Characteristics (VCCIO=+1.8V) Parameter Description Minimum Typical Maximum Units Conditions UVoh I/O Pins Static Output (High) 2.8 3.6 V RL = 1.5kΩ to 3.6 V UVol I/O Pins Static Output (Low) - 0.3 V RL = 15kΩ to GND UVse Single Ended Rx Threshold 0.8 2.0 V UCom Differential Common Mode 0.8 2.5 V UVDif Differential Input Sensitivity 0.2 V UDrvZ Driver Output Impedance 29 - 44 Ω Including external 27 Ω ±1% series resistor Table 8.6 USB I/O Pin (DP, DM) Characteristics 8.3 AC Characteristics Symbol Parameter VCCIO=3.3V VCCIO=1.8V Unit Min Max Min Max t1 SCLK period 50 60 ns t2 SCLK High period 25 30 ns t3 SCLK Low period 25 30 ns t4 SCLK driving edge to MOSI valid (3-wire mode) SCLK driving edge to MISO valid (4-wire mode) 5 15 8 22 ns t5 MOSI data setup time to sample SCLK edge 5 6 ns t6 MOSI data hold time from sample SCLK edge 5 5 ns |
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