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Four-Channel E1 Line Interface (3.3V or 5.0V)
March 2000-3
XRT5894
FEATURES D Compliant with ITU G.703 Pulse Mask Template for 2.048Mbps (E1) Rates D Four Independent CEPT Transceivers D Supports Differential Transformer Coupled Receivers and Transmitters D On Chip Pulse Shaping for Both 75W and 120W Line Drivers D Compliant with ITU G.775 LOS Declaration/Clearing Recommendation D Optional User Selectable LOS Declaration/Clearing Delay D Logical Inputs Accept either 3.3V or 5.0V Levels D Ultra-Low Power Dissipation D +3.3V or 5.0V Supply Operations D Individual Transmit Channel Over Temperature Protection APPLICATIONS D SDH Multiplexer D Digital Cross Connects
GENERAL DESCRIPTION The XRT5894 is an optimized four channel 3.3V line interface unit fabricated using low power CMOS technology. The device contains four independent E1 channels. Each channel performs the driver and receiver functions necessary to convert bipolar signals to logical levels and vice versa. The device requires transformers on both receiver and transmitter sides, and supports both balanced and unbalanced interfaces. The device offers two distinct modes of LOS detection. The first method, which does not require an external clock, provides an LOS output indication signal with thresholds and delay that comply with the ITU G.775 requirements. In the second mode, the user provides an external clock that increases the delay for LOS declaration and clearing. This feature provides the user with the flexibility to implement LOS specifications that require a delay greater than the G.775 requirements.
ORDERING INFORMATION
Operating Temperature Range -40°C to +85°C
Part No. XRT5894IV
Package 64 Lead TQFP (10 x 10 x 1.4mm)
Rev. 1.10
E2000
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017
XRT5894
BLOCK DIAGRAM
Transceiver 1 Transceiver 2 Transceiver 3 Tranceiver 4 RXPOS4 (47) Signal Peak Detector RRING4 (42) VCC LOS Detect Loss Delay Counter 1 Mux O LOS4 (48) Receive Comparators RXNEG4 (46)
RTIP4 (43) TIP 1:2 R1 R2
RX Input
RING
LOSCNT (45) LOSSEL (25) Transmit Line Drivers TIP TX OUTPUT RING 2:1 R3 9.1 R4 9.1 TRING4 (55) TTIP4 (53) Pulse Shaping
Duty Cycle Adjust 0 0 Mux 1 1 NRZ To RZ
TXCLK4 (51) TXPOS4 (49) TXNEG4 (50)
Figure 1. XRT5894 Block Diagram
Receiver Notes D The same type 1:2CT ratio transformer may be used at the receiver input and transmitter output. D R1 and R2 are both 150W for 75W operation, or 240W for 120W operation. D Return loss exceeds ITU G.703 specification with these resistors and a 1:2CT ratio input transformer. LOS (Loss of Signal) Notes D LOSSEL (pin 25) is connected to logic “1” for ITU G.775 compliant LOS delay, or to logic 0 for user programmable additional delay. D LOSCNT (pin 45) is unconnected when LOSSEL is logic 1, or connected to an external clock when LOSSEL is logic 0. Transmitter Notes D Return loss exceeds ETSI 300 166 specification with a 1:2 ratio transformer. D R3 and R4 are always 9.1W for both 75W and 120W applications.
Rev. 1.10 2
XRT5894
PIN CONFIGURATION
LOS4 RXPOS4 RXNEG4 LOSCNT GND RTIP4 RRING4 GND VCC GND TRING3 VCC TTIP3 GND RTIP3 RRING3 48 TXPOS4 TXNEG4 TXCLK4 GND TTIP4 VCC TRING4 GND GND TRING1 VCC TTIP1 GND TXCLK1 TXNEG1 TXPOS1 49 33 32 TXCLK3 TXNEG3 TXPOS3 LOS3 RXPOS3 RXNEG3 GND LOSSEL NC VCC RXNEG2 RXPOS2 LOS2 TXPOS2 TXNEG2 TXCLK2 64 1 16 17 LOS1 RXPOS1 RXNEG1 VCC RTIP1 RRING1 VCC
64 LEAD THIN QUAD FLAT PACK (10 x 10 x 1.4 mm, TQFP)
Rev. 1.10 3
TTIP2 GND RTIP2 RRING2
GND TRING2 VCC
GND VCC
XRT5894
PIN DESCRIPTION
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Symbol LOS1 RXPOS1 RXNEG1 VCC RTIP1 RRING1 VCC GND VCC GND TRING2 VCC TTIP2 GND RTIP2 RRING2 TXCLK2 TXNEG2 TXPOS2 LOS2 RXPOS2 RXNEG2 VCC NC LOSSEL GND RXNEG3 RXPOS3 LOS3 TXPOS3 TXNEG3 TXCLK3 RRING3 RTIP3 O O O I I I I I I I I I I I O O O O O I I Type O O O Description Receiver 1 Loss of Signal. Asserted during LOS condition. Receiver 1 Positive Data Out. Positive RZ data output for channel 1. Receiver 1 Negative Data Out. Negative RZ data output for channel 1. Positive Supply (+3.3V or +5.0V + 5%). Digital circuitry. Receiver 1 Positive Bipolar Input. Receiver 1 Negative Bipolar Input. Positive Supply (+3.3V or +5.0V + 5%). Analog circuitry. Analog Ground. Positive Supply. (+3.3V or +5.0V + 5%). Analog circuitry. Analog Ground. Transmitter 2 Negative Bipolar Output. Positive Supply (+3.3V or +5.0V + 5%). Transmitter channel 2. Transmitter 2 Positive Bipolar Output. Analog Ground. Transmitter channel 2. Receiver 2 Positive Bipolar Input. Receiver 2 Negative Bipolar Input. Transmitter 2 Clock Input. Use for clocked mode with NRZ data.1 Transmitter 2 Negative Data Input. Negative NRZ or RZ data input.1 Transmitter 2 Positive Data Input. Positive NRZ or RZ data input.1 Receiver 2 Loss of Signal. Asserted during LOS condition. Receiver 2 Positive Data Out. Positive RZ data output for channel 2. Receiver 2 Negative Data Out. Negative RZ data output for channel 2. Positive Supply (+3.3V or +5.0V + 5%). Digital circuitry. No Connect. Loss of Signal Delay Select. “Hi” selects G.775, “Lo” selects user programmable.1 Digital Ground. Receiver 3 Negative Data Out. Negative RZ data output for channel 3. Receiver 3 Positive Data Out. Positive RZ data output for channel 3. Receiver 3 Loss of Signal. Asserted during LOS condition. Transmitter 3 Positive Data Input. Positive NRZ or RZ data input.1 Transmitter 3 Negative Data Input. Negative NRZ or RZ data input.1 Transmitter 3 Clock Input. Use for clocked mode with NRZ data.1 Receiver 3 Negative Bipolar Input. Receiver 3 Positive Bipolar Input.
Note: 1 Has internal pull-up 50KW resistor. Rev. 1.10 4
XRT5894
PIN DESCRIPTION (CONT’D)
Pin # 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Symbol GND TTIP3 VCC TRING3 GND VCC GND RRING4 RTIP4 GND LOSCNT RXNEG4 RXPOS4 LOS4 TXPOS4 TXNEG4 TXCLK4 GND TTIP4 VCC TRING4 GND GND TRING1 VCC TTIP1 GND TXCLK1 TXNEG1 TXPOS1 I I I O O O O I O O O I I I I I O O Type Description Analog Ground. Transmitter 3 Positive Bipolar Output. Positive Supply (+3.3V or +5.0V + 5%). Transmitter channel 3. Transmitter 3 Negative Bipolar Output. Analog Ground. Transmitter channel 3. Positive Supply (+3.3V or +5.0V + 5%). Analog circuitry. Analog Ground. Receiver 4 Negative Bipolar Input. Receiver 4 Positive Bipolar Input. Analog Ground. Loss of Signal Timing Clock Input. For user--programmable LOS delay.1 Receiver 4 Negative Data Out. Negative RZ data output for channel 4. Receiver 4 Positive Data Out. Positive RZ data output for channel 4. Receiver 4 Loss of Signal. Asserted during LOS condition. Transmitter 4 Positive Data Input. Positive NRZ or RZ data input.1 Transmitter 4 Negative Data Input. Negative NRZ or RZ data input.1 Transmitter 4 Clock Input. Use for clocked mode with NRZ data.1 Analog Ground. Transmitter channel 4. Transmitter 4 Positive Bipolar Output. Positive Supply (+3.3V or +5.0V + 5%). Transmitter channel 4. Transmitter 4 Negative Bipolar Output. Digital Ground. Analog Ground. Transmitter 1 Negative Bipolar Output. Positive Supply (+3.3V or +5.0V + 5%). Transmitter channel 1. Transmitter 1 Positive Bipolar Output. Analog Ground. Transmitter channel 1. Transmitter 1 Clock Input. Use for clocked mode with NRZ data.1 Transmitter 1 Negative Data Input. Negative NRZ or RZ data input.1 Transmitter 1 Positive Data Input. Positive NRZ or RZ data input.1
Note: 1 Has internal pull-up 50KW resistor.
Rev. 1.10 5
XRT5894
Test Conditions: VCC = 3.3V or 5.0V + 5%, TA = -40 to 25 to 85°C, Unless Otherwise Specified
Symbol Parameters VCC VCC Inputs VIH VIL Outputs VOH VOL RXCL Output High Level Output Low Level Allowable Cable Loss 0 10 2.4 0.4 12 V V dB IOH = -4mA IOL = 4mA Cable loss at 1.024MHz (Relative to 0dB = 2.37Vp measured from RTIP or RRING to ground). With 6dB cable loss % of peak input voltage at -3dB cable loss Relative to 0dB = 2.37Vp Measured from RTIP or RRING to ground. Relative to 0dB = 2.37Vp measured from RTIP or RRING to ground. For LOS output state change Up to 3.072MHz (Measured from RTIP or RRING to ground). All 1’s Transmit and Receive 75W All Drivers Power Down All 1’s Transmit and Receive 50% data density, Transmit and Receive All 1’s Transmit and Receive 50% data density, Transmit and Receive All 1’s Transmit and Receive 75W All Drivers Power Down All 1’s Transmit and Receive Input High Level Input Low Level 2.0 5.0 0.8 V V Voltage Supply Voltage Supply 3.135 4.75 3.3 5.0 3.465 5.25 V V 3.3V Operation 5V Operation Parameter Min. Typ. Max. Unit Conditions DC Electrical Characteristics
ELECTRICAL CHARACTERISTICS
Receiver Specifications
RXIM RXXI RXLOSSET
Interference Margin Receiver Slicing Threshold LOS Must Be Set If RX Sig. Atten. ² 32dB (For Any Valid Data Pattern) LOS Must Be Cleared If RX Sig. Atten. < 9dB Hysteresis on Input Data Input Impedance
-15 45
-12 50 15 55 32
dB % dB
RXLOSCLR
9
12
dB
RXLOSHYST RXIN
1 5
dB kW
Power Specifications VCC = 3.3V PD PD PC PC PC PC Power Dissipation Power Dissipation Power Consumption 75W Power Consumption 75W Power Consumption 120W Power Consumption 120W 460 117 770 555 635 475 590 155 900 675 780 605 mW mW mW mW mW mW
Power Specifications VCC = 5.0V PD PD PC Power Dissipation Power Dissipation Power Consumption 75W 945 235 1250 1240 290 1555 mW mW mW
Note: Bold face parameters are covered by production test and guaranteed over operating temperature range. Rev. 1.10 6
XRT5894
ELECTRICAL CHARACTERISTICS (CONT’D) Test Conditions: VCC = 3.3V or 5.0V + 5%, TA = -40 to 25 to 85°C, Unless Otherwise Specified
Symbol PC PC PC Parameter Power Consumption 120W Power Consumption 75W Power Consumption 120W Min. Typ. 1075 1025 940 Max. 1345 1300 1220 Unit mW mW mW Conditions All 1’s Transmit and Receive 50% data density, Transmit and Receive 50% data density, Transmit and Receive Trans. = 1:2 ratio, 9.1W
