Datasheet

© Copyright 2005-2011 Future Technology Devices International Ltd
14
Document Reference No.: FT_000051
UM232R USB - Serial UART Development Module
Datasheet Version 1.1
Clearance No.: FTDI# 125
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Voh
Output Voltage High
2.1
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 6.8 UART and CBUS I/O Pin Characteristics (VCCIO = 2.8V, High Drive Level)
** Inputs have an internal 200kΩ pull-up resistor to VCCIO
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Vin
Input Switching Threshold
1.3
1.6
1.9
V
Vhys
Input Switching Hysteresis
50
55
60
mV
Table 6.9 RESET# and TEST Pin Characteristics
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Uvoh
I/O Pins Static Output (High)
2.8
---
3.6
V
RI = 1.5kΩ to 3V3Out
(D+) RI = 15KΩ to GND
(D-)
Uvol
I/O Pins Static Output (Low)
0
---
0.3
V
RI = 1.5kΩ to 3V3Out
(D+) RI = 15kΩ to GND
(D-)
Uvse
Single Ended Rx Threshold
0.8
---
2.0
V
Ucom
Differential Common Mode
0.8
---
2.5
V
UVDif
Differential Input Sensitivity
0.2
---
---
V
UdrvZ
Driver Output Impedance
26
29
44
Ohms
***
Table 6.10 USB I/O Pin (USBDP, USBDM) Characteristics
*** Driver Output Impedance includes the internal USB series resistors on USBDP and USBDM
pins