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INDEX
MX98702
FEATURE
* Compatible with ANSI X3T9.5 TP-PMD draft standard * Compatible with ANSI IEEE 802.3 100 Base-T fast ethernet draft standard * Integrated trans mitter and receiver with adaptive equalizer * Programmable NRZI and MLT3 selection * Programmable full equalization, normal equalization and equalization * Isolated digital and analog power supply to minimize the power and ground noise * Controlled transmit output slew rates to reduce EMI * Tri-state control of transmit output current * Loop back control for board diagnostics * Single 5 Volts supply * 28-pin PLCC
100BASE-TX PMD TRANSCEIVER
GENERAL DESCRIPTION
The MX98702 100Base-TX PMD transceiver is an integrated circuitcapable of transmitting and receiveing of 125 Mbaud three level (MLT-3) encoded datastream. it allows links of up to 100 meters of UTP (Unshielded Twisted paired cable) (over Category 5) and STP (Shielded Twisted paired cable).
PIN CONFIGURATION
VDD REF TGND TON TOP TGND TVDD
5 6 7 8 9 10 11
MX98702
28-PIN PQFP
25 24 23 22 21 20 19
ROP RON EVDD GND SDN SDD LBC
P/N:PM0361
REV.1.1, MAY. 31, 1996
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INDEX
MX98702
FUNCTIONAL BLOCK DIAGRAM
TXI
MLT-3 Encoder
Output Driver
TXO
SDO
RXO
Loopback Control
MLT-3/NRZI detector Adaptive Equalizer RXI
EQS
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MX98702
PIN DESCRIPTION
SIGNAL RIN RIP RGND RVDD VDD REF TGND TON TOP TGND TVDD ENCS VDD GND TIP TIN EQS OEB LBC SDP SDN GND EVDD RON ROP VDD RVDD RGND 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 PIN TYPE IN IN GND VDD VDD OUT GND OUT OUT GND VDD IN VDD GND IN IN IN IN IN OUT OUT GND VDD OUT OUT VDD VDD GND DESCRIPTION Receive negative input, differential voltage in. Receive positive input, differential voltage in. Receive ground. Receive VDD. Transmit VDD. A current output pin connected to a reference register. Transmit ground. Transmit negative output. Transmit positive output. Transmit ground. Transmit VDD. Encoder select. Power supply. Ground. Transmit positive PECL input. Transmit negative PECL input. Equalization select. Output enable. Loopback control. Signal detect positive output, ECL output. Signal detect negative output, ECL output. Ground. External power supply. Receive negative output, ECL output. Receive positive output, ECL output. Power supply. Receive VDD. Receive ground.
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MX98702
FUNCTIONAL DESCRIPTION
The TON and TOP are generated from the input of TIP and TIN through the MLT-3 encoder. The outputs are either XRZI or MLT3 waveform depending on the input of ENCS. When ENCS is low the TON and TOP are NRZI outputs. When ENCS is high the TON and TOP are MLT-3 outputs. The EQS will provide the choice of equalization. If pin EQS is over 2/3 of VDD, the equalization function is turn off. If it is below 1/3 of VDD, there will be a equalization for maximum length. After the receive inputs are equalizated, they will go ahead to the MLT-3/NRZI decoder, and then the Lookback control block. Finally, the RON and ROP with PECL level come out off the chip. SDP and SDN are generates to indicat that either a valid signal is present at RIN and RIP inputs or that loopback mode has been selected. SDP and SD are also PECL level. A voltage to current converter are integrated in the chip. The converter provides the reference current for transmit output. The current can be controlled through an external register which is connected to the REF pin.
ABSOLUTE MAXIMUM RATINGS
Logic Power Referenced to GND Received Power Referenced to RGND Transmit Power Referenced to TGND ECL output Power Referenced to GND DC output current (High) ESD Storage Temperature -6.5 -0.5V to +0.7V -0.5V to +0.7V -0.5V to +0.7V -0.5V to +0.7V -50mA TBD to +150
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MX98702
DC ELECTRICAL CHARACTERISTIC TA=25
SYMBOL VIHt VILt VIHschmitt VILschmitt VIHeqsel VILeqsel VIMeqsel VIHe VILe VOHe VOLe ICC1 ICCT ITXO1 ITXO2 SDTHon SDTHoff PARAMETER TTL High Level Input TTL Low Level Input Schmitt High Level Input Schmitt Low Level Input EQSEL High Level Input EQSEL Low Level Input EQSEL Mid Level Input ECL High Level Input ECL Low Level Input ECL High Level Output ECL Low Level Output Partial Supply Current Total Supply Currit Transmit Current 1 Transmit Current 2 Sig Det Turn-on Threshold Sig Det Turn-off Threshold Note 1 Note 1 Note 1 Note 1 Transmit Current/50 ohm Zo Transmit Current/75 ohm Zo 900 750 Vcc-1165 Vcc-1810 Vcc-1025 Vcc-1810 90 145 TBD TBD Vcc/2 Vcc-880 Vcc-1475 Vcc-880 Vcc-1620 3.7 1.5 3.7 1.5 CONDITIONS MIN 2.0 0.8 TYP MAX UNITS V V V V V V V mV mV mV mV mA mA mA mA mV mV
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INDEX
MX98702
Note 1
ICC2 ICC
TVDD ICCT
RVDD
VDD
EVDD SDP
MX98702
f Vcc REF
SDN ROP RON
TGND RGND GND TOP TON 510 ohm 50 ohm 50 ohm 50 ohm Vcc-2V + 50 ohm 50 ohm 50 ohm
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INDEX
MX98702
AC CHARACTERISTICS
SYMBLE TDr TOj ROj TOd ROd PARAMETER TOP, TON rise and Fall time ROP, TON jitter ROP, RON jitter TOP, TON propogation delay ROP, RON, proguation delay TBD TBD CONDITION MIN TYP MAX UNIT 2.0 800 ns ps ns ps ps
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MX98702
PACKAGE INFORMATION
28-PIN PLCC
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MX98702
MACRONIX INTERNATIONAL CO., LTD.
HEADQUARTERS:
No.3, Creation Road III, Science-Based Industrial Park, Hsin Chu, Taiwan, R.O.C. TEL:+886-3-578-8888 FAX:+886-3-578-8887
TAIPEI OFFICE:
12F, No.4, Min-Chuan E.Rd., Sec 3, Taipei, Taiwan, R.O.C. TEL:+886-3-509-3300 FAX:+886-3-509-2200
EUROPE OFFICE:
Koningin Astridlaan 59, Bus 1, 1780 Wemmel, Belgium TEL:+32-2-456-8020 FAX:+32-2-456-8021
SINGAPORE OFFICE:
5 Jalan Masjid Kembangan Court #01-12 Singapore 418924 TEL:+65-747-2309 FAX:+65-748-4090
MACRONIX AMERICA, INC.
1338 Ridder Park Drive, San Jose, CA95131 U.S.A. TEL:+1-408-453-8088 FAX:+1-408-453-8488
JAPAN OFFICE:
NFK Kawasaki Building, 8F, 1-2 Higashida-cho, Kawasaki-ku Kawasaki-shi, Kawasaki-ken 210, Japan TEL:+81-44-246-9100 FAX:+81-44-246-9105
MACRONIX INTERNATIONAL CO., LTD. reserves the right to change product and specifications without notice.
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