CS61305A-IL1 Cirrus Logic, Inc., CS61305A-IL1 Datasheet

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CS61305A-IL1

Manufacturer Part Number
CS61305A-IL1
Description
T1/E1 line interface
Manufacturer
Cirrus Logic, Inc.
Datasheet
Features
Preliminary Product Information
Crystal Semiconductor Corporation
P. O. Box 17847, Austin, Texas, 78760
(512) 445 7222 FAX:(512) 445 7581
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
[TCODE]
[RDATA]
[TDATA]
RNEG
TNEG
RPOS
TPOS
RCLK
TCLK
[BPV]
[ ] = Pin Function in Extended Hardware Mode
( ) = Pin Function in Host Mode
2
3
4
8
7
6
CODER
B8ZS,
HDB3
AMI,
LLOOP
(SCLK)
27
LOOP
BACK
RLOOP
T1/E1 Line Interface
(CS)
26
XTALIN
ATTENUATOR
9
This document contains information for a new product. Crystal
Semiconductor reserves the right to modify this product without notice.
JITTER
XTALOUT
Copyright
10
MODE
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
ORDERING INFORMATION
CS61305A-IP1
CS61305A-IL1
5
ACLKI
CONTROL
Crystal Semiconductor Corporation 1996
(CLKE)
Interfacing network transmission equipment such as
SONET multiplexor and M13 to a DSX-1 cross con-
nect.
Interfacing customer premises equipment to a CSU.
TAOS
1
RECOVERY
CLOCK &
(All Rights Reserved)
28
DATA
LOS
MONITOR
QUALITY
SIGNAL
LEN0
12
(INT)
23
LEN1
(SDI)
SHAPER
PULSE
RV+
24
21
(SDO)
LEN2
28 Pin Plastic DIP
28 Pin Plastic PLCC
RGND
25
22
LINE RECEIVER
TGND
LINE DRIVER
MONITOR
DRIVER
14
CS61305A
TV+
15
13
16
11
19
20
17
18
TTIP
TRING
RTIP
RRING
MTIP
[RCODE]
MRING
[PCS]
DPM
[AIS]
DS157PP3
MAY ’96
1

Related parts for CS61305A-IL1

CS61305A-IL1 Summary of contents

Page 1

... 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 CS61305A-IL1 (CLKE) (INT) XTALIN XTALOUT MODE TAOS LEN0 9 10 ...

Page 2

... TV+, RV+ = 5.0V 5%; GND = 0V) Symbol Min (Notes 2.0 IH (Notes (Notes 2.4 OH (Notes (RV+) - 0.2 IH (Note OUT CS61305A Min Max Units - 6 (RV+) + 0.3 V (RV+) + 0 -65 150 C Typ Max Units 5.0 5. ...

Page 3

... ABS((z +z )/( where series resistors terminated resistor across the secondary of the transmitter transformer CS61305A Min Typ Max 2.14 2.37 2.6 2.7 3.0 3.3 2.7 3.0 3.3 2.4 3.0 3.6 -0.237 - 0.237 -0 ...

Page 4

... CS61305A Typ Max Units 50k - - - peak peak 175 190 bits - ...

Page 5

... The maximum gap size that can pw2 CS61305A Min Typ Max Units - 6.176000 - MHz 1.544 - MHz 320 648 980 ns 130 190 ...

Page 6

... RPOS RNEG RDATA BPV RCLK Figure 2. Recovered Clock and Data Switching Characteristics 6 ( TV+, RV+ = 5%; Symbol (Note 31 90% 10% Figure 1. Signal Rise and Fall Characteristics t pw1 t pwl1 t pwh1 t t su1 h1 CS61305A Min Typ Max cdh t 240 - cl t 240 - ch t ...

Page 7

... Figure 3b. Alternate External Clock Characteristics cdh LSB BYTE DATA Figure 4. Serial Port Write Timing Diagram t cdv Figure 5. Serial Port Read Timing Diagram PCS t su4 t pcsl VALID INPUT DATA CS61305A t pw3 t pwh3 ACLKI t cwh t cch t cdh MSB BYTE t cdz HIGH ...

Page 8

... THEORY OF OPERATION Key Enhancements of the CS61305A Relative to the LXT305A 12.5% lower power consumption transmitter short-circuit current RMS limiting for E1 (per OFTEL OTR-001), Optional AMI, B8ZS, HDB3 encoder/de- coder or external line coding support, Receiver AIS (unframed all ones) detection, Improved receiver Loss of Signal handling ...

Page 9

... ATTENUATOR CS61305A AIS LINE RECEIVER DETECT AIS HOST MODE CLKE CONTROL JITTER LINE DRIVER ATTENUATOR DRIVER MONITOR CS61305A LINE RECEIVER Figure 7. Overview of Operating Modes CS61305A LEN0/1/2 TTIP TRANSMIT TRING TRANSFORMER MRING MTIP DPM RTIP RECEIVE RRING TRANSFORMER LEN0/1/2 TTIP TRANSMIT TRING ...

Page 10

... OFTEL OTR-001 short-circuit current limiting require- ments for E1 applications. The CS61305A will detect a static TCLK, and will force TTIP and TRING low to prevent trans- mission when data is not present. When any transmit control pin (TAOS, LEN0-2 or LLOOP) is toggled, the transmitter outputs will require ap- proximately 22 bit periods to stabilize ...

Page 11

... TRING). In this mode, the TPOS and TNEG (or TDATA) inputs are ignored. A TAOS request will be ignored if remote loopback is in effect. ACLKI jitter will be attenuated. TAOS is not available on the CS61305A when ACLKI is grounded. Nominal peak voltage of a mark (pulse) Peak voltage of a space (no pulse) ...

Page 12

... Crystal Semiconductor offers the CXT6176 & CXT8192 crystals, which yield optimum performance with the CS61305A. Receiver The receiver extracts data and clock from an AMI (Alternate Mark Inversion) coded signal and out- puts clock and synchronized data ...

Page 13

... In the Host Mode, CLKE determines the clock polarity for which output data is stable and valid as shown in Table 5. Jitter and Recovered Clock The CS61305A is designed for error free clock and data recovery from an AMI encoded data MODE (pin 5) LOW (< ...

Page 14

... Theoretically, this would give a jitter tolerance of 0.46 UI. The actual jitter tolerance of the CS61305A is only slightly less than the ideal. In the event of a maximum jitter hit, the RCLK clock period immediately adjusts to align itself ...

Page 15

... DPM is available from both the register and pin TCLK 11. Whenever more than one line interface IC resides on the same circuit board, the effectiveness of the driver performance monitor can be maximized by having each IC monitor performance of a neigh- boring IC, rather than having it monitor its own performance. CS61305A 15 ...

Page 16

... LOS high. Serial Interface In the Host Mode, pins 23 through 28 serve as a microprocessor/microcontroller interface. One on-board register can be written to via the SDI pin or read from via the SDO pin at the clock rate determined by SCLK. Through this register, a CS61305A DS157PP3 ...

Page 17

... Bits D0 and D1 are used to clear an interrupt is- sued from the INT pin, which occurs in response to a loss of signal or a problem with the output driver. Writing a "1" to either "Clear LOS" or "Clear DPM" over the serial interface has three effects: CS61305A ...

Page 18

... Schematic & Layout Review Service Confirm Optimum Schematic & Layout Before Building Your Board. For Our Free Review Service Call Applications Engineering CS61305A Status occured. occured. last "clear LOS" and "clear DPM". Table 12. Output Data Register (bits D5-D7) DS157PP3 ...

Page 19

... TPOS PLCC 7 top 8 view DPM LOS TTIP CS61305A Extended Hardware TAOS LLOOP RLOOP LEN2 LEN1 LEN0 RGND RV+ RRING RTIP MRING PCS MTIP RCODE TRING TV+ Hardware Extended Hardware TAOS LLOOP RLOOP LEN2 26 25 LEN1 ...

Page 20

... INT - Receive Alarm Interrupt, Pin 23. (Host Mode) Goes low when LOS or DPM change state to flag the host processor. INT is cleared by writing "clear LOS" or "clear DPM" to the register. INT is an open drain output and should be tied to the power supply through a resistor (47k - 100k). 20 CS61305A DS157PP3 ...

Page 21

... Clock used to read or write the serial port registers. SCLK can be either high or low when the line interface is selected using the CS pin. SDI - Serial Data Input, Pin 24. (Host Mode) Input for the input data register. Sampled on the rising edge of SCLK. DS157PP3 CS61305A 21 ...

Page 22

... TPOS/TNEG or TDATA are sampled on the falling edge of TCLK. TDATA - Transmit Data, Pin 3. (Extended Hardware Mode) Data to be transmitted by the TTIP and TRING outputs is input in NRZ format at this pin, after being encoded by the line code encoder. TDATA is sampled on the falling edge of TCLK. 22 CS61305A DS157PP3 ...

Page 23

... These pins are normally connected to TTIP and TRING and monitor the transmitter output. If the INT pin in the Host mode is used, and the monitor is not used, writing a "1" to the "clear DPM" bit will prevent an interrupt from the driver performance monitor. DS157PP3 CS61305A 23 ...

Page 24

... DIMENSION eA TO CENTER OF LEADS WHEN FORMED PARALLEL. 3. DIMENSION E1 DOES NOT INCLUDE MOLD FLASH. B D2/ pin E1 Plastic DIP 28-pin PLCC E E1 DIM MIN A 4.20 A1 2.29 B 0.33 D/E 12.32 D1/E1 11.43 D1 D2/E2 9. CS61305A MILLIMETERS DIM MIN NOM MAX MIN 3.94 4.32 5.08 0.155 A A1 0.51 0.76 1.02 0.020 B 0.36 0.46 0.56 0.014 B1 1.02 1.27 1.65 0.040 C 0.20 0.25 0.38 0.008 36.45 36.83 D 37.21 1.435 E1 13.72 13.97 14 ...

Page 25

... Table A1. External Component Values Mode. Figure A4 illustrates the Extended Hardware Mode. The receiver transformer has a grounded center tap on the IC side. Resistors between the RTIP and RRING pins to ground provide the termina- tion for the receive line. CS61305A 2 RECEIVE LINE 6 2CT:1 2 ...

Page 26

... Transformers Recommended transmitter and receiver trans- former specifications are shown in Table A2. The transformers in Table A3 are recommended for use with the CS61305A. Refer to the "Telecom Transformer Selection Guide" for detailed sche- matics which show how to connect the line interface IC with a particular transformer. ...

Page 27

... IN AIS EXTENDED 5 MODE HARDWARE 4 RRING TCODE MODE 7 RDATA 8 RCLK 3 TDATA TRING 2 TCLK TTIP 9 XTALIN 10 XTALOUT RGND TGND Extended Hardware Mode Configuration CS61305A 23 Line 24 Length 25 Setting 240 3 RECEIVE 6 LINE 240 20 5 2CT:1 PE-65351 TRANSMIT LINE 1:1 ...

Page 28

... If the line interface is used in Hardware mode, then the line interface RCLK output must be inverted be- fore being input to the CS62180B. If the CS61305A is used in Extended Hardware Mode, the RCLK output does not have to be inverted before being input to the CS62180B. 28 ...

Page 29

... Bel Fuse S553-0013-06 Pulse Engineering PE-65766 Bel Fuse S553-0013-07 Pulse Engineering PE-65835 Pulse Engineering PE-65839 Table A3. Recommended Transformers CS61305A Package Type 1.5 kV through-hole, single 1.5 kV through-hole, single 1.5 kV through-hole, single 1.5 kV through-hole, dual 1.5 kV through-hole, dual 1.5 kVsurface-mount, dual 1.5 kV surface-mount, dual 3 kV through-hole, single EN60950, EN41003 approved ...

Page 30

Notes • ...

Page 31

... ORDERING INFORMATION: CDB61534, CDB6158, CDB61574A, CDB61575, CDB61304A, CDB61305A +5V 0V Reset Circuit CS61534, CS61535, CS61535A, CS6158, CS6158A, CS61574, CS61574A, CS61575, CS61577, CS61304A or CS61305A coax E1, or 120 twisted-pair E1 operation. CDB61535. CDB61535A, CDB6158A, CDB61574, CDB61577, TTIP TRING RTIP RRING XTL twisted-pair SEP ’95 DS40DB3 31 ...

Page 32

... SW1 and jump- ers JP2, JP6, and JP7. The CS61535A, CS61574A, CS61575, CS61577, CS61304A, and CS61305A support the Hardware, Extended Hardware, and Host operating modes. The CS61534, CS61535, and CS61574 support the Hardware and Host operating modes. The CS6158 and CS6158A only support the Hardware operating mode ...

Page 33

... LOS applications with the CS61534, 12 CS61535, CS6158, CS61574, RV+ RV+ OR CS61577) LOS Q2 Q1 2N2222 2N2222 U1: CS61534, CS61535, LED LED CS61535A, CS6158 CS6158A, CS61574, CS61574A, CS61575 470 470 CS61577, CS61304A, OR CS61305A RV+ T2 RTIP 2:1 RRING TTIP JP5 (see Table 2) TRING 33 ...

Page 34

Performance Monitor alarm. The LED labeled LOS illuminates when the line interface receiver has detected a loss of signal. Extended Hardware Mode In the Extended Hardware operating mode, the line interface is configured using DIP switch S2. The digital control ...

Page 35

The evaluation board supports 100 T1, 75 coax E1, and 120 eration. The CDB61534, CDB61535, CDB6158, CDB61574, and CDB61577 are supplied from the factory with a 1:2 transmit transformer that may be used for all T1 and E1 applications. The ...

Page 36

A letter at the intersection of a row and column in Table 2 indicates that the selected transformer is supported for use with the device. The transformer is installed in the evaluation board with pin 1 positioned to match ...

Page 37

TRANSFORMER 1,2 (Turns Ratio) PE-65351 (1:2CT) Schott 12930 (1:2CT) PE-65388 (1:1.15) Schott 12931 (1:1.15) PE-65389 (1:1:1.26) Schott 12932 (1:1:1.26) PE-64951 (dual 1:2CT) Schott 11509 (dual 1:2CT) PE-65565 (dual 1:1.15 & 1:2CT) Schott 12531 (dual 1:1.15 & 1:2CT) PE-65566 (dual 1:1:1.26 ...

Page 38

LINE INTERFACE EVALUATION BOARD Figure 2. Silk Screen Layer (NOT TO SCALE) DS40DB3 ...

Page 39

Figure 3. Top Ground Plane Layer (NOT TO SCALE) DS40DB3 LINE INTERFACE EVALUATION BOARD 39 ...

Page 40

LINE INTERFACE EVALUATION BOARD Figure 4. Bottom Trace Layer (NOT TO SCALE) DS40DB3 ...

Page 41

Notes • ...

Page 42

Notes • ...

Page 43

Notes • ...

Page 44

TM Smart Analog is a Trademark of Crystal Semiconductor Corporation ...

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