USB-COM422-PLUS1 datasheet(13/23 Pages) ETC2

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Document Reference No.: FT_000131

USB-COM422-PLUS1 Datasheet

Version 1.1

Clearance No.: FTDI# 94

4 Electrical details

4.1 USB

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

USB_VCC

Input Power Voltage*

4.25

5.0*

5.25

*Present when USB

cable is attached and

USB Host or Hub

powered.

Icc

USB current

Table 4.1 USB Electrical Details

4.2 RS422

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Receiver Input

VCM

Common-mode input

voltage range

-7

+12

Input Current

1.0

VIN = +12V

-0.8

VIN = -7V

VTH

Differential Threshold

Voltage

-0.2

+0.2

VIHYST

Input Hysteresis

RIN

Input Resistance, RIN

Transmitter Output

VOD

Differential Output

Voltage,

1.5

With RL = 54

Ω.

CL = 50pF *

ESD Tolerance

ESD HBM

RS-422 Inputs and

Outputs

±15

EN61000-4-2

Contact Discharge

RS-422 Inputs and

Outputs

±8

EN61000-4-2 Air

Gap Discharge

RS-422 Inputs and

Outputs

±15

Table 4.2 RS422 Electrical Details

* - The 54 ohms is the equivalent of two 120 ohm termination resistors placed on each side of the

transmission line and the input impedance of 32 receivers on the line.

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