
Features
Provides Analog Transmission Line
Interface for T1 and E1 Applications
Provides Line Driver, Jitter Attenuator
and Clock Recovery Functions
Transmit Side Jitter Attenuation
Starting at 3 Hz, with > 300 UI of Jitter
Tolerance
B8ZS/HDB3/AMI Encoders/Decoders
Compatible with SONET, M13 , CCITT
G.742, and Other Asynchronous Muxes
50 mA Transmitter Short-Circuit
Current Limiting
General Description
The CS61305A 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 CS61305A is a pin-compatible replacement for the
LXT305A in most applications.
The CS61305A provides a transmitter jitter attenuator
making it ideal for use in asynchronous multiplexor
systems with gapped transmit clocks. The transmitter
features internal pulse shaping and a low impedance
output stage allowing the use of external resistors for
transmitter impedance matching. The receiver uses a
digital Delay-Locked-Loop clock and data recovery cir-
cuit which is continuously calibrated from a crystal
reference to provide excellent stability and jitter toler-
ance.
Applications
Interfacing network transmission equipment such as
SONET multiplexor and M13 to a DSX-1 cross con-
nect.
Interfacing customer premises equipment to a CSU.
ORDERING INFORMATION
CS61305A-IP1
28 Pin Plastic DIP
CS61305A-IL1
28 Pin Plastic PLCC
MAY ’96
DS157PP3
1
Crystal Semiconductor Corporation
P. O. Box 17847, Austin, Texas, 78760
(512) 445 7222 FAX:(512) 445 7581
T1/E1 Line Interface
SIGNAL
QUALITY
MONITOR
13
TTIP
TCLK
7
RRING
RTIP
19
20
17
11
18
TRING
16
TGND
14
CONTROL
DRIVER
MONITOR
LINE RECEIVER
LINE DRIVER
15
PULSE
SHAPER
3
2
6
4
RCLK
8
ACLKI
27
LLOOP
(SCLK)
26
RLOOP
(CS)
25
24
(INT)
LEN0
(SDI)
LEN1
(SDO)
LEN2
28
23
(CLKE)
TAOS
5
MODE
AMI,
B8ZS,
HDB3
CODER
TPOS
[TDATA]
TNEG
[TCODE]
RPOS
[RDATA]
RNEG
[BPV]
MTIP
[RCODE]
MRING
[PCS]
DPM
[AIS]
LOS
12
21
RV+
1
CLOCK &
DATA
RECOVERY
XTALIN
9
XTALOUT
10
JITTER
ATTENUATOR
LOOP
BACK
TV+
[ ] = Pin Function in
Extended Hardware Mode
( ) = Pin Function in
Host Mode
22
RGND
Copyright
Crystal Semiconductor Corporation 1996
(All Rights Reserved)
CS61305A
This document contains information for a new product. Crystal
Semiconductor reserves the right to modify this product without notice.
Preliminary Product Information