FT232BM USB UART ( USB - Serial) I.C.
UART IO Pin Characteristics ( VCCIO = 3.0 - 3.6V )
Parameter
Voh
Vol
Vin
VHys
Description
Output Voltage High
Output Voltage Low
Input Switching Threshold
Input Switching Hysteresis
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
V
V
mV
Conditions
I source = 1mA
I sink = 2 mA
**Note 4
**Note 4
– Inputs have an internal 200K pull-up resistor to VCCIO.
XTIN / XTOUT Pin Characteristics
Parameter
Voh
Vol
Vin
Description
Output Voltage High
Output Voltage Low
Input Switching Threshold
Min
4.0
0.1
1.8
Typ
-
-
2.5
Max
5.0
1.0
3.2
Units
V
V
V
Conditions
Fosc = 6MHz
Fosc = 6MHz
RESET#, TEST, EECS, EESK, EEDATA Pin Characteristics
Parameter
Voh
Vol
Vin
VHys
Description
Output Voltage High
Output Voltage Low
Input Switching Threshold
Input Switching Hysteresis
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
V
V
mV
Conditions
I source = 2mA
I sink = 2 mA
**Note 5
**Note 5
– EECS, EESK and EEDATA pins have an internal 200K pull-up resistor to VCC
RSTOUT Pin Characteristics
Parameter
Voh
Vol
Description
Output Voltage High
Output Voltage Low
Min
3.0
0.3
Typ
-
-
Max
3.6
0.6
Units
V
V
Conditions
I source = 2mA
I sink = 2mA
USB IO Pin Characteristics
Parameter
UVoh
UVol
UVse
UCom
UVDif
UDrvZ
Description
IO Pins Static Output ( High)
IO Pins Static Output ( Low )
Single Ended Rx Threshold
Differential Common Mode
Differential Input Sensitivity
Driver Output Impedance
Min
2.8
0
0.8
0.8
0.2
29
44
Typ
Max
3.6
0.3
2.0
2.5
Units
V
V
V
V
V
Ohm
**Note 5
Conditions
RI = 1.5K to 3V3Out ( D+ )
RI = 15K to GND ( D- )
RI = 1.5K to 3V3Out ( D+ )
RI = 15K to GND ( D- )
**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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