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CS61577-IL1Z

T1/E1 Line Interface

Cirrus Logic 

C#S361577

4T1/%E1,LIiNnEe)INnTtEeRrFfAaCcEe

&EATURES

'ENERAL$ESCRIPTION

• Provides Analog Transmission Line

Interface for T1 and E1 Applications

• Drop-in Replacement for CS61574 with

the Following Enhancements:

- Lower Power Consumption

- Transmitter Short-Circuit

Current Limiting

- Greater Transmitter Immunity

to Line Reflections

The CS61577 is a drop-in replacement for the

CS61574, and combines the complete analog transmit

and receive line interface for T1 or E1 applications in a

low power, 28-pin device operating from a +5V supply.

The CS61577 supports processor-based or stand-

alone operation and interfaces with industry standard

T1 and E1 framers.

The receiver uses a digital Delay-Locked-Loop which is

continuously calibrated from a crystal reference to pro-

vide excellent stability and jitter tolerance. The receiver

includes a jitter attenuator optimized for minimum delay

in switching and transmission applications. The trans-

mitter provides internal pulse shaping to insure

compliance with T1 and E1 pulse template specifica-

tions.

!PPLICATIONS

- Software Selection Between 75Ω and

120Ω E1 Output Options

- Internally Controlled E1 Pulse Width

- B8ZS/HDB3/AMI Encoder/Decoder

• Interfacing Network Equipment such as DACS and

Channel Banks to a DSX-1 Cross Connect

• Building Channel Service Units

/2$%2).').&/2-!4)/.

CS61577-IL1Z 28-pin PLCC, Lead Free

CS61577-IL1Z 28-pin PLCC

( ) = Pin Function in (OST-ODE

[ ] = Pin Function in %XTENDED(ARDWARE-ODE

(CLKE) (INT) (SDI) (SDO)

MODE TAOS LEN0 LEN1 LEN2 TGND TV+

2

TCLK

3

TPOS

[TDATA]

4

TNEG

[TCODE]

8

RCLK

7

RPOS

[RDATA]

RNEG 6

[BPV]

R

E

M

O

T

AMI,

E

B8ZS,

HDB3,

L

CODER

O

O

P

B

A

C

K

JITTER

ATTENUATOR

26

9

10

1

RLOOP XTALIN XTALOUT ACLKI

(CS)

5

28

23 24 25

14 15

L

O

LINE DRIVER 13

C

A

CONTROL

PULSE

SHAPER

16

L

L

LINE RECEIVER 19

O

CLOCK &

O

DATA

P

RECOVERY

20

B

17

A

SIGNAL

C

K

QUALITY

MONITOR

DRIVER

18

MONITOR

11

27 12

21

22

LLOOP

(SCLK)

LOS

RV+ RGND

TTIP

TRING

RTIP

RRING

MTIP

[RCODE]

MRING

[PCS]

DPM

[AIS]

Preliminary Product Information This document contains information for a new product. Crystal

Semiconductor reserves the right to modify this product without notice.

#RYSTAL3EMICONDUCTOR#ORPORATION

Ph.ttpO:/./wBwowx.1ci7rr8u4s.7c,oAmustin, Texas, 78760

(512) 445-7222 FAX:(512) 445-7581

Copyright ¤ Cirrus Logic, Inc. 200

(ACll oRpigyhritgshRt ©eseCrrvyesdta)l Semiconductor Corporation 1996

(All Rights Reserved)

M-A8Y/ ’‘906

DSD1S5155P5PF2



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