TTL-232R
TTL TO USB SERIAL CONVERTER RANGE OF CABLES Datasheet Version 2.02
Clearance No.: FTDI# 53
Header Pin
Number
4
5
6
Name
TXD
RXD
RTS#
Type
Output
Input
Output
Colour
Orange
Yellow
Green
Description
Transmit Asynchronous Data output.
Receive Asynchronous Data input.
Request To Send Control Output / Handshake signal.
Document Reference No.: FT_000054
Table 4.1 TTL-232R-5V and TTL-232R-3V3 Cable Signal Descriptions
4.3
TTL-232R-5V and TTL-232R-3V3 Electrical Parameters
4.3.1 TTL-232R-5V Electrical Parameters
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Dependant on the USB
VCC
Output Power Voltage
4.25
5.0
5.25
V
port that the TTL-232R-
5V is connected to
I
O
Output Power Current
Operating Temperature
Range
-
-
75
mA
Must be less that 2.5mA
during suspend.
T
-40
-
+85
o
C
Table 4.2 TTL-232R-5V I/O Operating Parameters
Parameter
Voh
Vol
Vin
VHys
Description
Output Voltage High
Output Voltage Low
Input Switching Threshold
Input Switching Hysteresis
Minimum
3.2
0.3
1.0
20
Typical
4.1
0.4
1.2
25
Maximum
4.9
0.6
1.5
30
Units
V
V
V
mV
Conditions
I source = 2mA
I sink = 2mA
Table 4.3 TTL-232R-5V I/O Pin Characteristics
4.3.2 TTL-232R-3V3 Electrical Parameters
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Dependant on the USB
VCC
Output Power Voltage
4.25
5.0
5.25
V
port that the TTL-232R-
3V3 is connected to
I
O
Output Power Current
Operating Temperature
Range
-
-
75
mA
Must be less that 2.5mA
during suspend.
T
-40
-
+85
o
C
Table 4.4 TTL-232R-3V3 I/O Operating Parameters
Copyright © 2010 Future Technology Devices International Limited
11
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