FT232R USB UART I.C. Datasheet Version 1.04

© Future Technology Devices International Ltd. 2005

Page 17

Table 9 - UART and CBUS I/O Pin Characteristics (VCCIO = 2.8V, Standard Drive Level)

Parameter Description

Min

Typ

Max

Units

Conditions

Voh

Output Voltage High

2.1

2.6

3.1

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

**

VHys

Input Switching Hysteresis

20

25

30

mV

**

Table 10 - UART and CBUS I/O Pin Characteristics (VCCIO = 5.0V, High Drive Level)

Parameter Description

Min

Typ

Max

Units

Conditions

Voh

Output Voltage High

3.2

4.1

4.9

V

I source = 6mA

Vol

Output Voltage Low

0.3

0.4

0.6

V

I sink = 6mA

Vin

Input Switching Threshold

1.3

1.6

1.9

V

**

VHys

Input Switching Hysteresis

50

55

60

mV

**

Table 11 - UART and CBUS I/O Pin Characteristics (VCCIO = 3.3V, High Drive Level)

Parameter Description

Min

Typ

Max

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 12 - UART and CBUS I/O Pin Characteristics (VCCIO = 2.8V, High Drive Level)

Parameter Description

Min

Typ

Max

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

**

**Inputs have an internal 200kΩ pull-up resistor to VCCIO.

Table 13 - RESET# and TEST Pin Characteristics

Parameter Description

Min

Typ

Max

Units

Conditions

Vin

Input Switching Threshold

1.3

1.6

1.9

V

VHys

Input Switching Hysteresis

50

55

60

mV

Table 14 - USB I/O Pin (USBDP, USBDM) Characteristics

Parameter Description

Min

Typ

Max

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

***

***Driver Output Impedance includes the internal USB series resistors on USBDP and USBDM pins.