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FT232BQ датащи(PDF) 13 Page - Future Technology Devices International Ltd. |
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FT232BQ датащи(HTML) 13 Page - Future Technology Devices International Ltd. |
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13 / 26 page ![]() DS232BQ Version 1.8 © Future Technology Devices Intl. Ltd. 2005 Page 13 of 25 FT232BQ USB UART ( USB - Serial) I.C. UART IO Pin Characteristics ( VCCIO = 3.0 - 3.6V ) Parameter Description Min Typ Max Units Conditions Voh Output Voltage High 2.2 2.7 3.2 V I source = 1mA Vol Output Voltage Low 0.3 0.4 0.5 V I sink = 2 mA Vin Input Switching Threshold 1.0 1.2 1.5 V **Note 4 VHys Input Switching Hysteresis 20 25 30 mV **Note 4 – Inputs have an internal 200K pull-up resistor to VCCIO. XTIN / XTOUT Pin Characteristics Parameter Description Min Typ Max Units Conditions Voh Output Voltage High 4.0 - 5.0 V Fosc = 6MHz Vol Output Voltage Low 0.1 - 1.0 V Fosc = 6MHz Vin Input Switching Threshold 1.8 2.5 3.2 V RESET#, TEST, EECS, EESK, EEDATA Pin Characteristics Parameter Description Min Typ Max Units Conditions Voh Output Voltage High 3.2 4.1 4.9 V I source = 2mA Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 2 mA Vin Input Switching Threshold 1.3 1.6 1.9 V **Note 5 VHys Input Switching Hysteresis 50 55 60 mV **Note 5 – EECS, EESK and EEDATA pins have an internal 200K pull-up resistor to VCC RSTOUT Pin Characteristics Parameter Description Min Typ Max Units Conditions Voh Output Voltage High 3.0 - 3.6 V I source = 2mA Vol Output Voltage Low 0.3 - 0.6 V I sink = 2mA USB IO Pin Characteristics Parameter Description Min Typ Max Units Conditions UVoh IO Pins Static Output ( High) 2.8 3.6 V RI = 1.5K to 3V3Out ( D+ ) RI = 15K to GND ( D- ) UVol IO Pins Static Output ( Low ) 0 0.3 V RI = 1.5K to 3V3Out ( D+ ) RI = 15K 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 29 44 Ohm **Note 5 **Note 5 – Driver Output Impedance includes the external 27R series resistors on USBDP and USBDM pins. |
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