DS_FT2232D Datasheet, PDF (32/61 Pages) List of Unclassifed Manufacturers – Future Technology Devices International Ltd

Document No.: FT_000173
FT2232D DUAL USB TO SERIAL UART/FIFO IC Datasheet
Version 2.05
Clearance No.: FTDI# 127
Figure 8.1 USB <=> Dual Port RS232 Converter Configuration
Figure 8.1 illustrates how to connect the FT2232D, when both channels A and B are configured as 232-
style UART interfaces, to two TTL – RS232 Level Converter I.C.‟s to make a USB <=> Dual Port RS232
converter using the popular “213” series of TTL to RS232 level converters. These devices have 4
transmitters and 5 receivers in a 28-LD SSOP package and feature an in-built voltage converter to
convert the 5V (nominal) VCC to the +/- 9 volts required by RS232. An important feature of these
devices is the SHDN# pin which can power down the device to a low quiescent current during USB
suspend mode.
The device used in the example above is a Sipex SP213EHCA which is capable of RS232 communication
at up to 500K baud. If a lower baud rate is acceptable, then several pin compatible alternatives are
available such as the Sipex SP213ECA , the Maxim MAX213CAI and the Analog Devices ADM213E, which
are all good for communication at up to 115,200 baud. If a higher baud rate is desired, use a Maxim
MAX3245CAI part which is capable of RS232 communication at rates of up to 1M baud. The MAX3245 is
not pin compatible with the 213 series devices, also its SHDN pin is active high, so connect it to PWREN#
instead of SLEEP#. Dual RS232 level converters such as the Maxim MAX3187 may also be a suitable
alternative.
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