FT232BM USB UART ( USB - Serial) I.C.
UART IO Pin Characteristics ( VCCIO = 3.0 - 3.6V )
Parameter Description
Min
2.2
0.3
1.0
20
Typ
2.7
0.4
1.2
25
Max
3.2
0.5
1.5
30
Units
V
Conditions
I source = 1mA
I sink = 2 mA
**Note 4
Voh
Vol
Output Voltage High
Output Voltage Low
V
Vin
Input Switching Threshold
Input Switching Hysteresis
V
VHys
mV
**Note 4 – Inputs have an internal 200K pull-up resistor to VCCIO.
XTIN / XTOUT Pin Characteristics
Parameter Description
Min
4.0
0.1
1.8
Typ
Max
5.0
1.0
3.2
Units
Conditions
Fosc = 6MHz
Fosc = 6MHz
Voh
Vol
Vin
Output Voltage High
-
-
V
V
V
Output Voltage Low
Input Switching Threshold
2.5
RESET#, TEST, EECS, EESK, EEDATA Pin Characteristics
Parameter Description
Min
3.2
0.3
1.3
50
Typ
4.1
0.4
1.6
55
Max
4.9
0.6
1.9
60
Units
V
Conditions
I source = 2mA
I sink = 2 mA
**Note 5
Voh
Vol
Output Voltage High
Output Voltage Low
V
Vin
Input Switching Threshold
Input Switching Hysteresis
V
VHys
mV
**Note 5 – EECS, EESK and EEDATA pins have an internal 200K pull-up resistor to VCC
RSTOUT Pin Characteristics
Parameter Description
Min
3.0
0.3
Typ
Max
3.6
Units
Conditions
Voh
Vol
Output Voltage High
Output Voltage Low
-
-
V
V
I source = 2mA
I sink = 2mA
0.6
USB IO Pin Characteristics
Parameter Description
Min
Typ
Max
Units Conditions
UVoh
IO Pins Static Output ( High)
2.8
3.6
V
RI = 1.5K to 3V3Out ( D+ )
RI = 15K to GND ( D- )
UVol
IO Pins Static Output ( Low )
0
0.3
V
RI = 1.5K to 3V3Out ( D+ )
RI = 15K to GND ( D- )
UVse
Single Ended Rx Threshold
Differential Common Mode
Differential Input Sensitivity
Driver Output Impedance
0.8
0.8
0.2
29
2.0
2.5
V
V
V
UCom
UVDif
UDrvZ
44
Ohm **Note 5
**Note 5 – Driver Output Impedance includes the external 27R series resistors on USBDP and USBDM pins.
DS232B Version 1.8
© Future Technology Devices Intl. Ltd. 2005
Page 12 of 25
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