Datasheet

Copyright © 2009 Future Technology Devices International Limited 11
Document No.: FT_000053
FT232R USB UART IC Datasheet Version 2.02
Clearance No.: FTDI# 38
Pin
No.
Name Type Description
Signal Options, Table 3.9.
10 CBUS2 I/O
Configurable CBUS I/O Pin. Function of this pin is configured in the device
internal EEPROM. Factory default configuration is TXDEN. See CBUS Signal
Options, Table 3.9.
11 CBUS3 I/O
Configurable CBUS I/O Pin. Function of this pin is configured in the device
internal EEPROM. Factory default configuration is PWREN#. See CBUS Signal
Options, Table 3.9. PWREN# should be used with a 10kΩ resistor pull up.
21 CBUS1 I/O
Configurable CBUS I/O Pin. Function of this pin is configured in the device
internal EEPROM. Factory default configuration is RXLED#. See CBUS Signal
Options, Table 3.9.
22 CBUS0 I/O
Configurable CBUS I/O Pin. Function of this pin is configured in the device
internal EEPROM. Factory default configuration is TXLED#. See CBUS Signal
Options, Table 3.9.
Table 3.8 UART Interface and CBUS Group (see note 3)
Notes:
1. The minimum operating voltage VCC must be +4.0V (could use VBUS=+5V) when
using the internal clock generator. Operation at +3.3V is possible using an external
crystal oscillator.
2. Contact FTDI Technical Support for details on how to use an external crystal, ceramic
resonator, or oscillator with the FT232R.
3. When used in Input Mode, the input pins are pulled to VCCIO via internal 200kΩ
resistors. These pins can be programmed to gently pull low during USB suspend (
PWREN# = “1”) by setting an option in the internal EEPROM.