XECOM XE0204 Datasheet

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XE0204

July 2000

2-Wire/4-Wire Telephone Line Interface

Description

The XE0204 provides a common telephone interface for networks integrating two and four-wire telephone connections. The XE0204 supplies two and four wire leased line connections, and complies with FCC Part 68 Rules for 2-wire connections to the public switched network.

The XE0204 supports voice, data and fax transfer at speeds to 14,400 Bits Per Second, V.32bis data transfer over two wires and V.33 data transfer over four wires.

The XE0204 is a complete DAA in a compact package. It includes the telephone line transformers, loop current holding circuit, ring detection, switch hook, two-to-four wire convertor and four-wire switch. The small size of the XE0204, just 1.5 square inches, allows the XE0204 to be used in most any application requiring connection to the telephone network.

Features

*Small Size 0 1.5” x 1.08” 0.42”

*FCC Part 68 Compliant

*Integral Ring Detection

*Integrated Switch Hook

*Switchable between two-wire and four-wire lines

*Integral two-to-four wire convertor

*Integrated telephone line transformers

*1500 volt isolation barrier between the telephone line and host equipment

*Supports both dial-up and leased line applications

*Supports 14,400 BPS data transfer; V.32bis (2-wire), V.33 (4-wire)

*Operates on a single +5 Volt supply

*Standard Operating Temperature Range 0C to 70C Optional operating range, -40C to 85C available

XE0204 Block Diagram

OH

Hook

Switch

XMIT

2 to 4 Wire

Telephone

Loop

Tx Tip

 

Current

 

RCVR

Line

 

Convertor

Holding

 

Transformer

 

 

 

Circuit

 

 

 

 

Tx Ring

 

4 Wire

 

 

 

 

 

 

/4Wire Switch

Ring

Detect

/RI

Rx Tip

Telephone

Line

Transformer

Rx Ring

XECOM

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XE0204

XE0204 Mechanical Specifications

 

Inches

Millemeters

 

 

 

 

Dim

Min

Max

Min

Max

 

 

 

 

A

1.480

1.520

37.59

38.61

 

 

A

 

B

1.060

1.100

26.92

27.94

 

 

 

 

 

 

 

C

0.420

0.430

10.67

10.92

 

 

 

 

D

0.890

0.910

22.61

23.11

 

 

 

 

E

0.890

0.910

22.61

23.11

 

 

 

B

F

0.125

-

3.18

-

 

 

 

G

0.040

0.060

1.02

1.52

 

 

 

 

H

0.290

0.310

7.37

7.87

 

 

 

 

J

0.090

0.110

2.29

2.79

 

 

 

 

K

0.020

0.025

0.51

0.64

 

 

Denotes Pin 1

 

 

 

 

 

 

C

 

 

K

 

 

 

 

 

 

 

 

 

 

D

 

G

 

 

J

F

 

 

 

 

H

 

 

 

 

 

 

 

E

 

XE0204 Pin Configuration

 

 

 

 

 

 

 

 

 

XE0204

 

 

 

 

 

 

 

 

(Top View)

 

 

 

 

 

 

 

VCC

1

20

TxTip

 

 

 

 

 

/RI

3

 

 

 

 

 

 

 

RCVR

4

17

TxRing

 

 

 

 

 

XMIT

5

 

 

 

 

 

 

 

OH

7

14

RxTip

 

 

 

 

 

/4Wire

8

 

 

 

 

 

 

 

N/C

9

 

 

 

 

 

 

 

Gnd

10

11

RxRing

 

XECOM

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XE0204

XE0204 Pin Configuration

Pin

Name

Description

1

VCC

VCC supplies +5 Volts power to the XE0204

3

/RI

Ring Indicate, output, active low, TTL. /RI indicates the XE0204 is receiving a ring signal. /RI remains

 

 

low for the duration of each ring.

4

RCVR

RCVR acts as the analog output for signals recevied from the telephone line by the XE0204. In two wire

 

 

mode the received signal is placed on RCVR by the 2-to-4 wire convertor. In four wire mode the

 

 

received signal comes directly from the receive phone line pair.

5

XMIT

XMIT provides the analog input to the XE0204 for signals to be transmitted onto the telephone line. In

 

 

two wire mode the signal is passed to the 2-to-4 wire convertor. In four wire mode the signal goes

 

 

directly the transmit phone line pair.

7

OH

Hookswitch relay control. A high on OH closes the internal relay and connects the equipment to the

 

 

telephone line. OH must be forced high to maintain a 2 wire or 4 wire leased line.

8

/4Wire

/4Wire is an active low input to the XE0204 which selects four wire operation. If pin 8 is open or driven

 

 

high, two wire mode is selected.

9

N/C

No Connection

10

Gnd

Gnd provides the ground reference connection to the XE0204.

11

RxRing

RxRing provides the Ring connection to the receive pair of the four wire phone line. RxRing is not used

 

 

for two wire connections. RxRing has 1500 volts isolation from the rest of the circuitry. This isolation

 

 

must be preserved throughout the system.

14

RxTip

RxTip provides the Tip Connection to the receive pair of the four wire phone line. RxTip is not used for

 

 

two wire connections. TxTip has 1500 volts isolation from the rest of the circuitry. This isolation must

 

 

be preserved throughout the system.

17

TxRing

TxRing provides the Ring Connection to two wire lines as well as to the transmit pair of four wire phone

 

 

lines. TxRing has 1500 volts isolation from the rest of the circuitry. This isolation must be preserved

 

 

throughout the system.

20

TxTip

TxTip provides the Tip Connection to two wire lines as well as to the transmit pair of four wire phone

 

 

lines. TxTip has 1500 volts isolation from the rest of the circuitry. This isolation must be preserved

 

 

throughout the system.

 

 

 

XECOM

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XE0204

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