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Preliminary
XRT59L91
Single-Chip E1 Line Interface Unit
October 1999-1
FEATURES
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Complete E1 (CEPT) line interface unit (Transmitter and Receiver) Generates transmit output pulses that are compliant with the ITU-T G.703 Pulse Template for 2.048Mbps (E1) rates On-Chip Pulse Shaping for both 75W and 120W Line Drivers Receiver can either be transformer or capacitively-coupled to the line Detects and Clears LOS (Loss of Signal) per ITU-T G.775 Compliant with the ITU-T G.823 Jitter Tolerance Requirements Compliant with the ITU-T G.703 EOS Overvoltage protection requirements
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Supports both Local- and Remote-Loop back Operations Logic Inputs accept either 3.3V or 5.0V levels Operates over the Industrial Temperature Range Ultra Low Power Dissipation +3.3V Supply Operation
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APPLICATIONS
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PDH Multiplexers SDH Multiplexers Digital Cross-Connect Systems DECT (Digital European Cordless Telephone) Base Stations CSU/DSU Equipment. Test Equipment
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GENERAL DESCRIPTION The XRT59L91 is an optimized single-chip analog 3.3V E1 line interface unit (LIU) fabricated using low power CMOS technology. The LIU IC consists of both a Transmitter and a Receiver function. The Transmitter accepts a TTL or CMOS level signal from the Terminal Equipment; and outputs this data to the line via bipolar pulses that are compliant to the ITU-T G.703 pulse template for E1. The Receiver accepts an attenuated bipolar line signal (from the remote terminal equipment) and outputs this data to the (near-end) terminal equipment via CMOS level signals. The receiver input can be transformer or capacitivelycoupled to the line. The receiver input is transformercoupled to the line, using the 2:1 step-down transformer. The transmitter is coupled to the line using a 1:2 step-up transformer. This same configuration is applicable for both balanced (120W ) and unbalanced (75W ) interfaces.
ORDERING INFORMATION
Part No. XRT59L91ID Package 16 LD JEDEC SOIC (300 mil) Operating Temperature Range -40°C to +85°C
Rev. P2.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 · (510) 668-7000 · FAX (510) 668-7017
XRT59L91
Preliminary
RxLO S
RTIP RRing
Recei Receive Equaliz ve Equalizer er
Peak Peak Detector/ Slice Detector/ Slicer r
LO S S LO Detect Detector or
Receive Receive O utput Interfac O utput Interface e
RxPO S RxNEG
LLoop
Loca Local Loop Loop lBack Back M UX M UX
Rem ot Rem ote Loop e Loop Back Back MM UX UX
RLoop
TTIP
PulsePulse Shaping Circui Circuit Shaping t
Transm it Transm it Input Interfac Input Interface e
TxPO S TxNEG TxClk
TRing
Figure 1. XRT59L91 Block Diagram
Rev. P2.00
2
Preliminary
PIN CONFIGURATION
1 16
XRT59L91
T xC lk T xP O S T xN E G L L oo p R L o op R xP O S R xN E G R xL O S 8
TVSS T R in g TVDD T T IP RVDD RVSS R R ing
9
R T IP
PIN DESCRIPTION Pin#
1
Symbol
TxClk
Type
I
Description
Transmitter Clock Input: If the user operates the LIU in the “clocked” mode, then the “Transmit Section” of the LIU will use the falling edge of this signal to sample the data at the TxPOS and TxNEG input pins.
Note: If the user operates the LIU in the “clockless” mode, then the Terminal Equipment should not apply a clock signal to this input pin.
2 TxPOS I Transmit – Positive Data Input: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of the device) in the “Clocked” or “Clockless” Mode. Clocked Mode The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “positivepolarity” pulse onto the line via TTIP and TRing output pins. The XRT59L91 device will sample this input pin upon the falling edge of the TCLK signal. Clockless Mode The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP and TRing output pins.
Rev. P2.00
3
XRT59L91
PIN DESCRIPTION Pin#
3
Preliminary
Symbol
TxNEG
Type
I
Description
Transmit – Negative Data Input: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of the device) in the “Clocked” or “Clockless” Mode. Clocked Mode The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via TTIP and TRing output pins. The XRT59L91 device will sample this input pin upon the falling edge of the TClk signal. Clockless Mode The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “negativepolarity” pulse onto the line via TTIP and TRing output pins.
4
LLoop
I
Local Loopback Input Select: This input pin permits the user to configure the XRT59L91 device to operate in the “Local Loopback” Mode; in order to support Diagnostic Operations. When the XRT59L91 device is operating in the Local Loopback Mode, then TTIP and TRing output signals will be (internally) routed to RTIP and RRing input signals. Setting this input pin “high” configures the XRT59L91 device to operate in the “Local Loopback” Mode. Setting this input pin “low” configures the XRT59L91 device to operate in the “Normal” Mode.
Note: Pulling both the “LLoop” and “RLoop” input pins to VDD, simultaneously, will cause the XRT59L91 device to operate in the “InCircuit Test” Mode. In this mode, all output pins will be tri-stated.
5 RLoop I Remote Loopback Input Select: This input pin permits the user to configure the XRT59L91 device to operate in the “Remote Loopback” Mode; in order to support Diagnostic Operations. When the XRT59L91 device is operating in the Remote Loopback Mode, then the RxPOS and RxNEG output pins will be (internally) routed to the TxPOS and TxNEG input pins. Setting this input pin “high” configures the XRT59L91 device to operate in the “Remote Loopback” Mode. Setting this input pin “low” configures the XRT59L91 device to operate in the “Normal” Mode.
Note: Pulling both the “LLoop” and “RLoop” input pins to VDD, simultaneously, will cause the XRT59L91 device to operate in the “InCircuit Test” Mode. In this mode, all output pins will be tri-stated.
Rev. P2.00
4
Preliminary
PIN DESCRIPTION Pin#
6
XRT59L91
Symbol
RxPOS
Type
O
Description
Receive Positive Pulse Output: This output pin will pulse “high” whenever the XRT59L91 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP/RRing inputs. Receive Negative Pulse Output: This output pin will pulse “high” whenever the XRT59L91 device has received a “Negative Polarity” pulse, in the incoming line signal, at RTIP/RRing inputs. Receive Loss of Signal Output Indicator: This output pin toggles “high” if the XRT59L91 device has detected a “Loss of Signal” condition in the incoming line signal. Receive TIP Input: This input pin, along with RRing is used to receive the bipolar line signal from the “Remote E1 Terminal”. Receive Ring Input: This input pin, along with RTIP is used to receive the bipolar line signal from the “Remote E1 Terminal”. Receiver Ground Pin Receiver Power Supply Pin: 3.3V + 5% Transmit TIP Output: The XRT59L91 device will use this pin, along with TRing, to transmit a bipolar line signal, via a 1:2 step-up transformer. Transmitter Power Supply Pin: 3.3V + 5% Transmit Ring Output: The XRT59L91 device will use this pin, along with TTIP, to transmit a bipolar line signal, via a 1:2 step-up transformer. Transmitter Ground Pin
7
RxNEG
O
8
RxLOS
O
9
RTIP
I
10
RRing
I
11 12 13
RVSS RVDD TTIP
O
14 15
TVDD TRing
O
16
TVSS
-
Rev. P2.00
5
XRT59L91
Preliminary
AC ELECTRICAL CHARACTERISTICS 25°C Unless otherwise specified: TA= VDD=3.3V±5%, unless otherwise specified.
Parameter TClk Clock Period TClk Duty Cycle Transmit Data Setup Time Transmit Data Hold Time Transmit Data Prop. Delay Time - RZ data Mode - NRZ data Mode (clock mode) TClk Rise Time(10%/90%) TClk Fall Time(90%/10%) Receive Data Rise Time Receive Data Fall Time Receive Data Prop. Delay Receive Data Pulse Width TR TF Rtr Rtf Rpd Rxpw Symbol T1 T2 TSU THO T3 Min 47 50 30 210 Typ 488 50 50 50 160 244 Max 53 Unit ns % ns
40 40 40 40 450
ns
ns ns ns ns ns ns ns ns
DC ELECTRICAL CHARACTERISTICS 25°C Unless otherwise specified: TA=-, VDD=3.3V±5%, unless otherwise specified.
Parameter Power Supply Voltage Input High Voltage Input Low Voltage Output High Voltage @ IOH = -4mA Output Low Voltage @ IOL = 4mA Input Leakage Current (except Input pins with pull-up resistor Input Capacitance Output Load Capacitance IL CI CL 5.0 ± 10 25 mA pF pF Symbol VDD VIH VIL VOH VOL Min 3.13 2.0 -0.5 2.4 Typ 3.3 Max 3.46 5.0 0.8 0.4 Unit V V V V V
Power Consumption including the line power dissipation, tranmission and receive paths all active Unless otherwise specified: TA=-40 to 85°C, VDD=3.3V±5%, unless otherwise specified.
Parameter Power Consumption Power Consumption Power Consumption Power Consumption Power Consumption Symbol PC PC PC PC PC Min Typ 130 115 170 140 25 Max 145 130 185 155 30 Unit mW mW mW mW mW Conditions 75W load, operating at 50% Mark Density 120W load, operating at 50% Mark Density 75W load, operating at 100% Mark Density 120W load, operating at 100% Mark Density Transmitter in Powereddown mode
Rev. P2.00
6
Preliminary
RECEIVER ELECTRICAL CHARACTERISTICS TA=-40 to 85°C, VDD=3.3V±5%, unless otherwise specified.
Parameter Receiver Loss of Signal: Threshold to Assert Threshold to Clear Time Delay Hysteresis Receiver Sensitivity Min 12 11 10 11 Typ 20 15 5 13 Max 255 Unit dB dB bit dB dB
XRT59L91
Test Conditions Cable attenuation @ 1024KHz per ITU-G.775 Below nominal pulse amplitude of 3.0V for 120W and 2.37V for 75W applications. With -18dB interfe
