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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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FT232R датащи(PDF) 17 Page - Future Technology Devices International Ltd. |
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FT232R датащи(HTML) 17 Page - Future Technology Devices International Ltd. |
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17 / 40 page  Copyright © Future Technology Devices International Limited 17 FT232R USB UART IC Datasheet Version 2.16 Document No.: FT_000053 Clearance No.: FTDI# 38 Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 1.35 1.67 1.8 V I source = 0.4mA Vol Output Voltage Low 0.12 0.18 0.35 V I sink = 3mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** VHys Input Switching Hysteresis 20 25 30 mV ** Table 5.10 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, High Drive Level) ** Only input pins have an internal 200KΩ pull-up resistor to VCCIO Parameter Description Minimum Typical Maximum Units Conditions Vin Input Switching Threshold 1.3 1.6 1.9 V VHys Input Switching Hysteresis 50 55 60 mV Table 5.11 RESET# and TEST Pin Characteristics Parameter Description Minimum Typical Maximum Units Conditions UVoh I/O Pins Static Output (High) 2.8 3.6 V RI = 1.5kΩ to 3V3OUT (D+) RI = 15KΩ to GND (D-) UVol I/O Pins Static Output (Low) 0 0.3 V RI = 1.5kΩ to 3V3OUT (D+) RI = 15kΩ to GND (D-) 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 26 29 44 Ohms See Note 1 Table 5.12 USB I/O Pin (USBDP, USBDM) Characteristics 5.3 EEPROM Reliability Characteristics The internal 1024 Bit EEPROM has the following reliability characteristics: Parameter Value Units Data Retention 10 Years Write 10,000 Cycles Read Unlimited Cycles Table 5.13 EEPROM Characteristics 5.4 Internal Clock Characteristics The internal Clock Oscillator has the following characteristics: Parameter Value Unit Minimum Typical Maximum Frequency of Operation (see Note 1) 11.98 12.00 12.02 MHz Clock Period 83.19 83.33 83.47 ns Duty Cycle 45 50 55 % Table 5.14 Internal Clock Characteristics |
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