3. TTL-232R Pin Out and Signal Descriptions
3.1 TTL-232R Pin Out
Page 5
Figure 3 - TTL-232R 6 Way Header Pin Out
3.2 Serial TTL Signal Descriptions
Table 1 - Serial TTL Signals
Header pin
No.
1
2
3
4
5
6
Name
GND
CTS#
VCC
TXD
RXD
RTS#
Type
GND
Input
Output
Output
Input
Output
Colour
Black
Brown
Red
Orange
Yellow
Green
Description
Device groud supply pin.
Clear to Send Control input / Handshake signal.
+5V Output
Transmit Asynchronous Data output.
Receive Asynchronous Data input.
Request To Send Control Output / Handshake signal.
4. TTL-232R Parameters
Table 2 - TTL-232R I/O Operating Parameters
Parameter
VCC
Io
T
Description
Output Power Voltage
Output Power Current
Operating Temperature Range
Min
4.25
-
-40
Typ
5.0
-
-
Max
5.25
50
+85
Units
V
mA
ºC
Conditions
Dependant on the USB port that
the TTL-232R is connected to
Table 3 - TTL-232R I/O Pin Characteristics
Parameter
Voh
Vol
Vin
VHys
Description
Output Voltage High
Output Voltage Low
Input Switching Threshold
Input Switching Hysteresis
Min
3.2
0.3
1.3
50
Typ
4.1
0.4
1.6
55
Max
4.9
0.6
1.9
60
Units
V
V
V
mV
Conditions
I source = 6mA
I sink = 6mA
**
**
Both the FT232RQ I.C. device used and the entire TTL-232R are fully compliant with European Union directive
2002/95/EC.
TTL-232R USB to TTL Serial Converter Cable
Datasheet Version 1.0
© Future Technology Devices International Ltd. 2006
FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
