XRT4000 datasheet(7/46 Pages) EXAR

7 / 46 page

XRT4000

Rev. 1.00

- 7 -

PIN DESCRIPTION (CONT’D)

Symbol

DTE

Mode

DCE

Mode

Type

Function

TR7

LLA

I/O

DTE Mode - Transmitter 7 - Single Ended Data Output to line

DCE Mode - Receiver 7 - Single Ended Data Input from line

TX76D

D_LL

D_DCD

Digital Input - Refer to Mode Control Table

TR6A

DCDA

I/O

DTE Mode - Receiver 6 - Negative Data Differential Input

from line

DCE Mode - Transmitter 6 - Negative Data Differential

Output to line

TR6B

DCDB

I/O

DTE Mode - Receiver 6 - Positive Data Differential Input from

line

DCE Mode - Transmitter 6 - Positive Data Differential Output

to line

DCE/DTE*

LOW

HIGH

DCE/DTE Select - Selects operating mode. Logic 0: DTE

Mode. Logic 1: DCE Mode. Internal 20K

Ω pull-up

RX67D

D_DCD

D_LL

Digital Output - Refer to Mode Control Table

RX5D

D_DSR

D_DTR

Receiver 5 - Digital Data Output to equipment

EC*

Enable Clock Mode - Active Low, Logic 0: Echoed Mode.

Logic 1: Normal Mode. Internal 20K

Ω pull-up

RX5B

DSRB

DTRB

Receiver 5 - Positive Data Differential Input from line

RX5A

DSRA

DTRA

Receiver 5 - Negative Data Differential Input from line

RX4A

CTSA

RTSA

Receiver 4 - Negative Data Differential Input from line

RX4B

CTSB

RTSB

Receiver 4 - Positive Data Differential Input from line

SLEW_

CNTL

Analog Output - Resistor connected between this pin and

Ground controls transmitter output pulse rise and fall time in

V.10 or V.28 mode as specified in Figures 15 and 16

respectively.

RX4D

D_CTS

D_RTS

Receiver 4 - Digital Data Output to equipment

GND

Digital GND for Receiver 4, 5, 6

GND

Analog GND for bias generator.

VSS

Analog Substrate - Connect to -6V

E_232H*

High Speed RS-232 Enable - Logic 0: Enables high speed

RS-232 mode (drives 3K

Ω in parallel with 1000pF at 256KHz).

Internal 20K

Ω pull-up

VDD

Analog VDD for bias generation circuit; Connect to +5V

VPP

VPP - Connect to +12V supply

VPP

VPP - Connect to +12V supply

VR - Internally generated +2.2V Reference (Sources 20

µA

maximum)

Note: An asterisk (*) following a pin symbol indicates that the pin is active low.

Names begining with D_ are digital signals.

Names ending with B and A are the positive and negative polarities of differential signals respectively

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