herunterladen
Features
•
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
- Software Selection Between 75Ω and
120Ω E1 Output Options
- Internally Controlled E1 Pulse Width
- B8ZS/HDB3/AMI Encoder/Decoder
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.
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
MAY ’96
DS155PP2
1
Crystal Semiconductor Corporation
P. O. Box 17847, Austin, Texas, 78760
(512) 445-7222 FAX:(512) 445-7581
T1/E1 Line Interface
TTIP
TCLK
7
RRING
RTIP
TRING
TGND
14
CONTROL
LINE RECEIVER
LINE DRIVER
15
3
2
6
4
RCLK
8
27
LLOOP
(SCLK)
2524
(INT)
LEN0
(SDI)
LEN1
(SDO)
LEN2
28 23
(CLKE)
TAOS
5
MODE
TPOS
[TDATA]
RPOS
[RDATA]
RNEG
[BPV]
TNEG
[TCODE]
MTIP
[RCODE]
DPM
[AIS]
LOS
12 21
RV+
22
RGND
13
19
20
17
11
18
16
MRING
[PCS]
XTALIN
9
XTALOUT
10
ACLKI
1
( ) = Pin Function in
Host Mode
[ ] = Pin Function in
Extended Hardware Mode
26
RLOOP
(CS)
R
E
M
O
T
E
L
O
O
P
B
A
C
K
AMI,
B8ZS,
HDB3,
CODER
JITTER
ATTENUATOR
PULSE
SHAPER
CLOCK &
DATA
RECOVERY
SIGNAL
QUALITY
MONITOR
DRIVER
MONITOR
TV+
L
O
C
A
L
L
O
O
P
B
A
C
K
Copyright
Crystal Semiconductor Corporation 1996
(All Rights Reserved)
CS61577
This document contains information for a new product. Crystal
Semiconductor reserves the right to modify this product without notice.
Preliminary Product Information
