Datasheet

Copyright © 2011 Future Technology Devices International Limited 18
Document Reference No.: FT_000204
DB9-USB Datasheet
Version 2.1
Clearance No.: FTDI# 130
5 Electrical details
5.1 USB
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
USB_VCC
Input Power Voltage*
4.25
5.0*
5.25
V
*Present when USB
cable is attached and
USB Host or Hub
powered.
Icc
USB current
30
50
mA
Table 5.1 – USB Electrical Details
5.2 RS232 Level UART
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Vtrans
Transmitter output
voltage swing
± 5
V
RL = 3KΩ
Vrec
Receiver input voltage
range
±2.4
±25
V
Input resistance = 3KΩ
to 7KΩ
ESD HBM
±15
KV
RS-232 Inputs and
Outputs
Table 5.2 – RS232 Electrical Details
5.3 3.3V Level UART
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Voh
Output Voltage High
2.2
2.7
3.2
V
I source = 1mA
Vol
Output Voltage Low
0.3
0.4
0.5
V
I sink = 2mA
Vin
Input Switching
Threshold
1.0
1.2
1.5
V
**
Table 5.3 – 3.3V Level UART Electrical Details
5.4 5V Level UART
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Voh
Output Voltage High
3.2
4.1
4.9
V
I source = 2mA
Vol
Output Voltage Low
0.3
0.4
0.6
V
I sink = 2mA
Vin
Input Switching
Threshold
1.0
1.2
1.5
V
**
Table 5.4 – 5V Level UART Electrical Details