Document No.: FT_000053
FT232R USB UART IC Datasheet Version 2.07
Clearance No.: FTDI# 38
3
Device Pin Out and Signal Description
3.1 28-LD SSOP Package
4
1
5
3
11
2
9
10
6
23
22
13
14
12
XXXXXXXXXXXX
TXD
DTR#
RTS#
1
28
OSCO
OSCI
TEST
VCCIO
VCC
TXD
RXD
20
16
15
USBDM
RTS#
USBDP
CTS#
FT232RL
14
Name
USBDP
USBDM
Name
VCCIO
GND
VCCIO
RXD
RI#
GND
NC
DSR#
DCD#
CTS#
CBUS4
CBUS2
CBUS3
AGND
NC
8
FT232RL
NC
RESET#
NC
OSCI
OSCO
DTR#
DSR#
DCD#
RI#
CBUS0
CBUS1
Figure 3.1 SSOP Package Pin Out and Schematic Symbol
3.2 SSOP Package Pin Out Description
Note: The convention used throughout this document for active low signals is the signal name followed by
a#
Pin No.
15
16
Type
I/O
I/O
Description
USB Data Signal Plus, incorporating internal series resistor and 1.5kΩ pull up
resistor to 3.3V.
USB Data Signal Minus, incorporating internal series resistor.
Table 3.1 USB Interface Group
YYXX-A
FTDI
15
CBUS0
CBUS1
GND
VCC
RESET#
GND
3V3OUT
USBDM
USBDP
19
24
27
28
17
3V3OUT
A
G
N
D
25
7
G
N
D
18
G
N
D
21
G
N
D
26
T
E
S
T
CBUS2
CBUS3
CBUS4
Pin No.
Type
Description
+1.8V to +5.25V supply to the UART Interface and CBUS group pins (1...3, 5, 6,
9...14, 22, 23). In USB bus powered designs connect this pin to 3V3OUT pin to
drive out at +3.3V levels, or connect to VCC to drive out at 5V CMOS level. This
pin can also be supplied with an external +1.8V to +2.8V supply in order to drive
outputs at lower levels. It should be noted that in this case this supply should
originate from the same source as the supply to VCC. This means that in bus
powered designs a regulator which is supplied by the +5V on the USB bus should
be used.
Device ground supply pins
4
PWR
7, 18,
21
PWR
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7
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