Digital Intarface Line Transceiver XRT6164

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EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017

Rev. 4.0.0

XRT6164Digital Line Interface Transceiver

February 2007

FEATURES

z Single 5V Supply

z CCITT G.703 Comp at ibl e When Used Wit h

Either XR-T6165 or XR-T6166

z Low Powe r

z TTL Compat ib le Digi ta l Input s and Out put s

z Links Remot e Equipment at Dist ances up t o

500 Met ers Wit hout Equal izat ion

z Receive Data Comparat or Threshold St orage

Provi des Ping-Pong Operat ion Capabil i t y

z Loss of Signal Alarm

z Dual Mat ched Driver Output s

ORDERING INFORMATION

Operating

Part No. Package Temperature Range

XRT6164CP 16-Lead 300 Mi l PDIP 0C t o +70C

XRT6164CD 16-Lead 300 Mi l JEDEC SOIC 0C t o +70C

APPLICATIONS

z Dat a Adaption Unit (DAU)

z General Purpose TTL Compat ib le Line Inter -

face

GENERAL DESCRIPTION

The XRT6164 is a CMOS analog chip int ended f or general purpose l ine int erf ace appl icat ions at b i t rat es up t o

1.544Mbps (T1). It contains both receive and tr ansmit circuit ry in a 16-pin dual-in-l ine plast ic package. The receiver

is designed for short l ine appl icat ions having a cable loss up t o 10dB measured at t he hal f b i t rat e. The t ransmit t erhas open collector l ine driver out puts that are capable of handling up to 40mA. When used in conjunct ion wit h either

XRT6165 or XRT6166, t he chip set p rovi des a 64Kbps codirect ional i nt erf ace as specif ied in CCITT G.703.


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Block DIagram

Figure 1. XRT6164 Block Diagram

PEAK CAP

RX+I/P

RX-I/P

TCM CON

VCC

A

GNDA

TX+I/P

TX-I/P

VCC

D

GNDD

14

16

1

15

11

6

9

7

PeakDetector

S + R12

S - R

RX ALARM

TCMControl

TX + O/P10

TX - O/P8

I/P BIAS

TTLBuffer

Positive

DataComparator

NegativeData

Comparator

TTLBuffer

TTLBuffer

5

3

13

4

Bias 2

OpenCollector

Driver

OpenCollector

Driver

ThresholdGenerator


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PIN CONFIGURATION

16 Lead PDIP (0.300) 16 Lead SOIC (Jedec, 0.300)

PIN DESCRIPTIONPin# Symbol Type Descr ipt ion

1 RX-I/ P I Receiver Negative Bipolar Input. Line analog input .

2 I/ P BIAS O Receive Input Bias. Connects to center t ap of input t r ansform er secondary winding.

3 RX ALARM O Loss of Signal Alarm. Act ive low.

4 G N D A Analog Ground.

5 S- R O Receive Negative Data Output. Output f rom negat ive bipolar input pulses (act ive low) .

6 TX-I/ P I Transmit Negat ive Input Data. Input for negat ive output dr iver (act ive high) .

7 G N D D Digit al Ground.

8 TX-O/ P O Transmit Negati ve Output Driver. Open col lector , d r ives output t r ansform er pr imary.

9 V CCD +5V +/-5% Digit al Suppl y.

1 0 TX+O/ P O Transmit Posit ive Output Dri ver. Open col lector , d r ives output t r ansform er pr imary.

1 1 TX+I/ P I Transmit Posit ive Input Data. Input for posi t ive output dr iver (act ive high) .

1 2 S+ R O Receive Posit ive Data Output . Output f rom posi t ive bipolar input pulses (act ive low) .

1 3 V CCA +5V +/ -5% Analog Supply .

1 4 P EA K C A P Peak Detector Capacit or. Stor es peak det ector vol tage.

1 5 TCM CON I Time Compression Multiplex Control. When act ive, d isconnects peak detect or charge

and discharge paths (act ive l ow) .

1 6 RX+I/ P I Receiver Positive Bipolar Input. Line analog input .


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ELECTRICAL CHARACTERISTICS

Test Condit ions: V CC = 5V +/ - 5%, T A = 25C, Unless Otherwise Specified

Par amet er s Min. Typ. Max. Unit s Condi t ionsDC Electrical Characteristics

Supply Vol t age 4. 75 5 5. 25 V

Analog Supply Current 4 8 m A

Digi tal Supply Current 13 20 m A

Receiver

Input Signal 1 2. 2 V p Measured f rom Pins 1 or 16 w i t h Respect t o Pin 2

Dynam i c Range 1 0 d B Maxim um Cabl e Loss Range

Input Im pedance 2 0 k Measured Between Pins 1 and 16

Input Sl i cing Threshold 5 0 % Per cent of Peak Input Signal Am pl i t ude

Input Bias Voltage 1.45 V Measured at Pin 2

Loss of Signal Alarm Threshold 1 5 0 m Vp Measur ed f r om Pins 1 or 16 w i t h Respect t o Pin 2

Loss of Signal Alarm Level +/ -1.5 d B Di f f erence Bet w een Alar m -on and Alar m -of fHyst er esi s Leve l s

Peak Det ect or Leakage - 80 A

Data Output Low 0.4 V Me asu r ed at Pi ns 5 or 12 , I OUT = +1 . 6m A

Data Output High 3.6 V Me asu r ed at Pi ns 5 or 12 , I OUT = - 40A

Alarm Output Low 0.4 V Me asu re d at Pi n 3; I OUT = +1. 6m A

Alarm Output High V CC - V Me asu re d at Pi n 3; I OUT = - 40A

0. 5

TCM Input Low Voltage 0.8 V Me asu re d a t Pi n 1 5; I IN Mi n = -500A, I IN Max =

+5A

Transmitter

Input Low Vol t age 0. 8 V Measur ed at Pins 6, 11; I IN = -700A

Input High Vol t age 2. 2 V Measured at Pins 6, 11; I IN = +5A

Output Low Vol tage 1 V Me asu r ed at Pi ns 8 , 10 ; I OUT = - 40 mA

Out put Low Cur rent 4 0 m A Measured at Pins 8, 10; V OUT = 1V

Output Leakage Current -100 A Measu r ed at P ins 8 , 10; V OU T = 10V Ou t pu t s i n

off stat e

AC Electrical Characteristics

Receiver

Input Level 1 2. 2 V p Pin 1, 16 w i t h Respect t o Pin 2 1

Output Rise Time 50 n s Pi ns 5 , 12 ; C L = 1 5p F, 1 0% t o 90 %

Out put Fal l Tim e 5 0 n s Pins 5, 12; C L =15pF, 90% t o 10%

Notes:

1. Higher input volt ages are possibl e if a resist ive input att enuat or is used.Bold f ace parameter sare covered by producti on test and guaranteed over operat ing temperature range.


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ELECTRICAL CHARACTERISTIC (CONT D)

Paramet ers Min. Typ. Max. Unit s Condi t ions

AC Elect ri cal Character isti cs (Cont d)

Transmitter

Output Rise Time 50 n s Pins 8 , 10; R L = 130, C L = 15pF, 10% to 90%

Output Fal l Time 50 n s Pins 8 , 10; R L = 130, C L = 15pF, 90% to 10%

Rising Edge Delay 100 n s Pins 8 , 10; R L = 130, C L = 15pF, 50% to 50%

(I/ P to O/ P)

Fal l ing Edge Delay 100 ns Pins 8 , 10 ; R L = 130, C L = 15pF, 50% to 50%

(I/ P to O/ P)

Notes:

Bold f ace parameter sare covered by product ion t est and guarant eed over operati ng t emperatur e range.

Specif icat ions are subject t o change wit hout not ice

ABSOLUTE MAXIMUM RATINGS

Supply Voltage 20V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage Temperature -65 C to +150C . . . . . . .. . . . .

Magnetic Supplier Information:PulseTelecom Product Group

P.O. Box 12235San Diego, CA 92112

Tel. (619) 674-8100Fax. (619) 674-8262

Transpower Technologies, Inc.

24 Highway 28, Suite 202Crystal Bay, NV 894020187

Tel. (702) 8310140Fax. (702) 8313521


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SYSTEM DESCRIPTION

The XRT6164 is a general pur pose l ine int erf ace chip

t hat cont ains t he receive and t ransmit ci rcui tr y neces-

sary t o convert TTL logic levels to a bipolar signal bot h

t o and f rom a t wis ted pa i r cab le .

Receiver

The XRT6164 receiver section converts a balanced

bipolar signal that has been att enuated and dist ort ed

by up t o 10dB of t wis ted pa i r cab le to act ive- low TTL

compatib le logic levels.

The cable is t ransform er coupled to t he receiver diff er-

ent ial i nput s (RX+IP, RX-IP) which ar e biased th rough

t he input t ransform er secondary winding by a vol t agegenerated on-chip ( I / P BIAS). The bipolar r eceive

signal is applied t o a peak det ector, and to a pair of dat a

comparators. The peak detector output vo l tage

charges an external capaci tor connected to PEAK

CAP. This vol tage generates a data comp arator bias

level t hat is approximately 50% of t he peak input pulse

ampl i t ude. Thus, dat a sl ic ing is automat ical ly accom-

p l ished a t t he opt imum leve l over the f u l l cab le loss

range. TTL compatib le output stages buffer the re-

ceiver dig i ta l output s (S+R, S-R) and provide act ive

low signals corresponding t o received posi t ive and

negati ve input pul ses.

Loss of input signal is det ect ed by a comparator t hat

monit ors input signal level. An active-low TTL compat -

ible logic level (RX ALARM) indicates signal loss.

Comparator hyst eresis prevent s chatt er on this output .

Ping-pong operation is made possible by the t ime

compression mult ip lex control input (TCM CON). A

logic 0 applied t o t his pin during tr ansmission st ores the

peak detector output vo l tage by d isconnect ing t he

peak det ect or st orage capacit or charge and discharge

paths. Since t he receive dat a comparator bias vol t age

is s tored dur ing t ransmi t mode, i t i s immedia te lyavai lable when r eceive mode resumes.

Transmitter

The XRT6164 t ransmi t te r sect ion conta ins two

mat ched open collector output drivers t hat are capable

of driving the l ine tr ansform er directly wi t h a current up

t o 40mA. The transmit t er output dr ivers include diode

clamps to ensure non-saturat ing operation. Transmit -

t er d ig i ta l input s, w hich are act i ve-high, are TTL com-

pati ble. External resist ors are used betw een the t rans-

mit ter out puts and the output tr ansformer prim ary to set

the output pulse ampl i tude.

APPLICATION INFORMATION

Figure 2shows a general l ine dr iver appl icat ion circui t

using the XRT6164. This device converts bipolar

t ransmi t and rece ive s igna ls in the 64Kbps to

1.544Mbps range to act ive- low TTL compat ib le l ogic

levels.

Bipolar signals that have been attenuated and dis-

t ort ed by t wisted pair cable are t ransform er-coupled to

t he l ine side of t he XRT6164 as shown on t he lef t side

of Figure 2. Suggest ed t ransform ers for bot h t he inputand out put appl icat ions are t he Pulse t ypes PE-65535

or TTI7147 for 64Kbps use and the PE-65835 for

1.544Mbps appli cat ions.

The r ight side of Figure 2shows the TTL compatib l e

digi ta l inputs and outputs. Please refer to the pin

descr ipt ion section of th is data sheet for detai led

inform ation about each signal .


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Figure 2. XRT6164 Line Driver Application

XRT6164


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16 LEAD PLASTIC DUAL-IN-LINE(300 MIL PDIP)

Rev. 1.00

INCHES MILLIMETERSSYMBOL MIN MAX MIN MAX

A 0. 145 0. 210 3. 68 5. 33

A 1 0. 015 0. 070 0. 38 1. 78

A 2 0. 115 0. 195 2. 92 4. 95

B 0. 014 0. 024 0. 36 0. 56

B 1 0. 030 0. 070 0. 76 1. 78

C 0. 008 0. 014 0. 20 0. 38

D 0. 745 0. 840 18. 92 21. 34

E 0. 300 0. 325 7. 62 8. 26

E 1 0. 240 0. 280 6. 10 7. 11

e 0. 100 BSC 2. 54 BSC

e A 0. 300 BSC 7. 62 BSC

e B 0. 310 0. 430 7. 87 10. 92

L 0. 115 0. 160 2. 92 4. 06

0 15 0 15

Not e:The cont rol dimension is t he inch column


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16 LEAD SMALL OUTLINE(300 MIL JEDEC SOIC)

Rev. 1.00

INCHES MILLIMETERSSYMBOL MIN MAX MIN MAX

A 0. 093 0. 104 2. 35 2. 65

A 1 0. 004 0. 012 0. 10 0. 30

B 0. 013 0. 020 0. 33 0. 51

C 0. 009 0. 013 0. 23 0. 32

D 0. 398 0. 413 10. 10 10. 50

E 0. 291 0. 299 7. 40 7. 60

e 0. 050 BSC 1. 27 BSC

H 0. 394 0. 419 10. 00 10. 65

L 0. 016 0. 050 0. 40 1. 27

0 8 0 8

Note: The contr ol dimension is the mil li meter column


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NOTICE

EXAR Corporation reserves the right to make changes to the products contained in this publication in order toimprove design, performance or reliability. EXAR Corporation assumes no responsibil ity for the use of any

circuits described herein, conveys no license under any patent or other right, and makes no representation thatthe circuits are free of patent infringement. Charts and schedules contained here in are only for illustrationpurposes and may vary depending upon a users specific application. While the information in this publication

has been carefully checked; no responsibility, however, is assumed for inaccuracies.

EXAR Corporation does not recommend the use of any of its products in life support applications where thefailure or malfunction of the product can reasonably be expected to cause failure of the life support system or to

significantly affect its safety or effectiveness. Products are not authorized for use in such applications unlessEXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage hasbeen minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately

protected under the circumstances.

Copyright 2007 EXAR CorporationDatasheet February 2007

Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.

Digital Intarface Line Transceiver XRT6164

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