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3. TTL-232R Pin Out and Signal Descriptions
3.1 TTL-232R Pin Out
Figure 3 - TTL-232R 6 Way Header Pin Out
3.2 Serial TTL Signal Descriptions
Table 1 - Serial TTL Signals
Header pin Name
No.
Type Colour Description
1
2
3
4
5
6
GND
CTS#
VCC
TXD
GND
Black
Brown
Red
Device groud supply pin.
Input
Clear to Send Control input / Handshake signal.
+5V Output
Output
Output
Input
Orange
Yellow
Green
Transmit Asynchronous Data output.
Receive Asynchronous Data input.
Request To Send Control Output / Handshake signal.
RXD
RTS#
Output
4. TTL-232R Parameters
Table 2 - TTL-232R I/O Operating Parameters
Parameter Description
Min
Typ
Max
Units Conditions
VCC
Output Power Voltage
4.25
5.0
5.25
V
Dependant on the USB port that
the TTL-232R is connected to
Io
T
Output Power Current
-
-
-
50
mA
ºC
Operating Temperature Range
-40
+85
Table 3 - TTL-232R I/O Pin Characteristics
Parameter Description
Min
Typ
Max
Units
Conditions
Voh
Output Voltage High
3.2
4.1
4.9
V
I source = 6mA
Vol
Output Voltage Low
0.3
1.3
50
0.4
1.6
55
0.6
1.9
60
V
V
I sink = 6mA
Vin
Input Switching Threshold
Input Switching Hysteresis
**
**
VHys
mV
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. ]
