CS61577
T1/E1 Line Interface
Features
General Description
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.
•
Provides Analog Transmission Line
the Following Enhancements:
-
Lower Power Consumption
-
Interface for T1 and E1 Applications
•
Drop-in Replacement for CS61574 with
Transmitter Short-Circuit
Current Limiting
Greater Transmitter Immunity
to Line Reflections
Software Selection Between 75
Ω
and
120
Ω
E1 Output Options
Internally Controlled E1 Pulse Width
B8ZS/HDB3/AMI Encoder/Decoder
( ) = Pin Function in
Host Mode
[ ] = Pin Function in
Extended Hardware Mode
2
TCLK
TPOS
[TDATA]
TNEG
[TCODE]
RCLK
RPOS
[RDATA]
RNEG
[BPV]
3
R
E
M
O
T
E
L
O
O
P
B
A
C
K
26
-
Applications
-
•
•
Interfacing Network Equipment such as DACS and
Channel Banks to a DSX-1 Cross Connect
Building Channel Service Units
-
-
ORDERING INFORMATION
CS61577-IP1
28 Pin Plastic DIP
CS61577-IL1
28 Pin Plastic PLCC
MODE
5
(CLKE) (INT) (SDI) (SDO)
TAOS LEN0 LEN1 LEN2
28
23
24
25
TGND
TV+
4
L
O
C
A
L
L
O
O
P
B
A
C
K
1
15
14
LINE DRIVER
13
16
CONTROL
PULSE
SHAPER
LINE RECEIVER
TTIP
TRING
8
7
AMI,
B8ZS,
HDB3,
CODER
19
20
17
JITTER
ATTENUATOR
CLOCK &
DATA
RECOVERY
SIGNAL
QUALITY
MONITOR
RTIP
RRING
MTIP
[RCODE]
MRING
[PCS]
DPM
[AIS]
6
DRIVER
MONITOR
22
RGND
18
11
9
10
27
LLOOP
(SCLK)
12
LOS
21
RV+
RLOOP XTALIN XTALOUT ACLKI
(CS)
Preliminary Product Information
Crystal Semiconductor Corporation
P. O. Box 17847, Austin, Texas, 78760
(512) 445-7222 FAX:(512) 445-7581
This document contains information for a new product. Crystal
Semiconductor reserves the right to modify this product without notice.
Copyright
©
Crystal Semiconductor Corporation 1996
(All Rights Reserved)
MAY ’96
DS155PP2
1
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