Datasheet

Copyright © 2010 Future Technology Devices International Limited 19
Document Reference No.: FT_000054
TTL-232R TTL TO USB SERIAL CONVERTER RANGE OF CABLES Datasheet Version 2.02
Clearance No.: FTDI# 53
7.2 TTL-232R-3V3-2mm Cable Signal Descriptions
Header Pin
Number
Name
Type
Colour
Description
1
RI#
Output
Blue
Ring Indicator Control Input. When remote wake up is
enabled taking RI# low (20ms active low pulse) can be
used to resume the VMUSIC2 or VDRIVE2 host controller
from suspend. Connected to TXD.
2
KEY
KEY
KEY
This connection is keyed to connect to the VRDIVE2 or the
VMUSIC2 modules
3
RTS#
Output
Green
Request To Send Control Output / Handshake signal.
4
RXD
Input
Yellow
Receive Asynchronous Data input.
5
TXD
Output
Orange
Transmit Asynchronous Data output.
6
VCC
Output
Red
+5V output,
7
CTS#
Input
Brown
Clear to Send Control input / Handshake signal.
8
GND
GND
Black
Device ground supply pin.
Table 7.1 TTL-232R-3V3-2mm Cable Signal Descriptions
7.3 TTL-232R-3V3-2mm Electrical Parameters
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
VCC
Output Power Voltage
4.25
5.0
5.25
V
Dependant on the USB port
that the TTL-232R-3V3-2mm
is connected to
I
O
Output Power Current
-
75
mA
Must be less that 2.5mA
during suspend.
T
Operating Temperature
Range
-40
+85
o
C
Table 7.2 TTL-232R-3V3-2mm I/O Operating Parameters
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Voh
Output Voltage High
2.2
2.8
3.2
V
I source = 3mA
Vol
Output Voltage Low
0.3
0.4
0.6
V
I sink = 8mA
Vin
Input Switching Threshold
1.0
1.2
1.5
V
VHys
Input Switching Hysteresis
20
25
30
mV
Table 7.3 TTL-232R-3V3-2mm I/O Pin Characteristics