MTD394N

MYSON TECHNOLOGY Coaxial Transceiver Interface FEATURES · · · · · · · · · · · · MTD392 FAMILY Compatible with ISO/IEEE 802.3 10Base5 (Ethernet) and 10Base2 ( Cheapernet). Functionally compatible with National DP8392C. Internal squelch circuitry for noise rejection. Reception/transmission mode collision detection. Transceiver functions integrated except for signal and power isolation. CD heartbeat externally selectable. Advanced low-power, high-performance CMOS technology. ESD protection greater than 2000 volts. 16-pin plastic DIP package, 24-pin skinny plastic DIP package, or 20 and 28-pin PLCC packages. Built-in LED drivers for collision, reception, jabber and transmission status display (MTDX93/X94 only). Collision detection mode for reception, transmission and hybrid (MTDX94 only). Special test mode allowing continuous transmission for waveform testing (MTDX94 only). GENERAL DESCRIPTION The MTD392 family includes a series of products, MTD392/3/4 and MTD492/3/4. The MTD392 product family is built for easy MAU interface in a coaxial Ethernet network. The MTD392 product family integrates the coaxial cable interface functions of Medium Attachment Unit (MAU) in Ethernet or Cheapernet LAN applications. In an Ethernet 10Base5 network, the MTD392 product family is mounted on the thick Ethernet coaxial cable and connects to a station through an AUI cable. For Cheapernet applications, the MTD392 product family is connected to the Cheapernet coaxial cable through a BNC connector and is usually mounted on the LAN adapter in a station. Following is a table describing the differences among the MTD392 product family: Product MTD392 MTD393 MTD394 MTD49X Features Basic transceiver MTD392 with built-in LEDs MTD393 with enhanced collision detection mode, special pin for testing MTD39X with improved performance Package Types 16-PDIP 28-PLCC 20-PLCC 24-PDIP 24-PDIP 28-PLCC Recommended Applications Adapter boards Adapter cards with status LEDs MTD393 applications with enhanced collision detection Basic MTD39X applications, Hub, repeater and MAU applications This datasheet contains new product information. Myson Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. MTD392 Revision 2.01 02/25/1997 1/10 MYSON TECHNOLOGY BLOCK DIAGRAM FOR MTD392 FAMILY COAX HIGH PASS EQUALIZATION FXI GND LOW PASS FILTER LOW PASS FILTER + CARRIER SENSE COM MTD392 FAMILY AUI DRIVER RX+ RXAUI DRIVER CD+ CDTX+ TX- 125 10K XMT CDS LOW PASS FILTER + COLLISION VEE RECV TXO WAVEFORM SHAPING 10MHz CLK OSC WATCH DOG TIMER 26ms + - DC/AC SQUELCH VEE RR+ 1K JABBER RESET XMTSQ TIMER 0.4sec REFERENCE CIRCUIT RR- TRANSMIT STATE MACHINE HBE RECEIVE STATE MACHINE Block Diagram for MTDX92 COAX HIGH PASS EQUALIZATION FXI GND LOW PASS FILTER LOW PASS FILTER + CARRIER SENSE COM AUI DRIVER RX+ RXAUI DRIVER CD+ CDTX+ TX- 125 10K XMT CDS LOW PASS FILTER + COLLISION VEE RECV TXO WAVEFORM SHAPING 10MHz CLK OSC + WATCH DOG TIMER 26ms DC/AC SQUELCH XMTSQ JABBER RESET TIMER 0.4sec JAB VEE RR+ 1K REFERENCE CIRCUIT RR- TRANSMIT STATE MACHINE HBE RECEIVE STATE MACHINE XMT COL RCV Block Diagram for MTDX93 MTD392 Revision 2.01 02/25/1997 2/10 MYSON TECHNOLOGY COAX HIGH PASS EQUALIZATION FXI GND LOW PASS FILTER LOW PASS FILTER LOW PASS FILTER CDS MODE WAVEFORM SHAPING CLK/1024 COM MTD392 FAMILY AUI DRIVER RX+ RXAUI DRIVER CD+ CDTX+ + + CARRIER SENSE COLLISION 125 10K XMT TX- VEE RECV TXO + WATCH DOG TIMER 26ms DC/AC SQUELCH XMTSQ JABBER RESET TIMER 0.4sec JAB XMT COL LED DRIVER RCV 16X RR+ 1K 1X 10MHz OSC CLK TEST REFERENCE CIRCUIT RR- TRANSMIT STATE MACHINE MOD HBE TEST RECEIVE STATE MACHINE Block Diagram for MTDX94 1.0 CONNECTION DIAGRAM (1) MTDX92 Pin Diagram CDS CD+ TXD RX+ CD- CD+ CDRX+ VEE VEE RXTX+ TX- 1 2 3 4 5 6 7 8 16 15 14 CDS TX0 RXI VEE RRRR+ GND HBE VEE VEE VEE VEE VEE(NC) VEE(NC) VEE(NC) RXTX+ HBE GND GND RR+ TX- RXI NC VEE(NC) VEE VEE MTD392N 13 MTD392V 28 PIN PLCC 16 PIN PDIP 12 11 10 9 VEE VEE VEE(NC) RR- MTD392 Revision 2.01 02/25/1997 3/10 MYSON TECHNOLOGY (2) MTDX93 Pin Diagram CD+ CDRX+ GND VEE RXCOL JAB TX+ TXXMT RCV 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 MTD392 FAMILY CDS CDS TX0 RXI VEE VEE RRRR+ GND GND NC NC HBE GND VEE RXCOL JAB TXO CD+ RX+ CD- RXI VEE MTD393N 19 24 PIN PDIP (300 MIL) 18 17 16 15 14 13 MTD393V 20 PIN PLCC RRRR+ GND XMT TX+ (3) MTDX94 Pin Diagram GND GND GND CDS CD+ RCV HBE TX- CD+ CDRX+ GND VEE RXCOL JAB TX+ TXXMT RCV 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 CDS TX0 RXI VEE VEE RRRR+ GND GND MOD~ TST~ HBE RX+ GND VEE RXCOL JAB TX+ TXD CD- RXI VEE VEE MTD394N 19 24 PIN PDIP (300 MIL) 18 17 16 15 14 13 MTD394V 28 PIN PLCC VEE RRRR+ GND XMT MOD RCV HBE TX- 2.0 PIN DESCRIPTIONS Name TX+,TXI/O I MTD X92 PIN# 7 8 MTD X93 PIN# 9 10 MTD X94 Description PIN# 9 Transmission Data Input. A balanced differential line 10 receiver that receives input from the off-chip Manchester Code Converter (MCC) to the Transmitter. The common mode voltage on TX± is set internally. 13 Heartbeat Enabler. The CD heartbeat test is enabled when HBE is connected to Ground and disabled when HBE is connected to VEE. 18 External Resistor. A 1kW,/1% resistor should be connected 19 across these pins to correctly set internal operating currents. RR+ is internally shorted to GND. MTD392 Revision 2.01 02/25/1997 4/10 HBE RR+,RR- I I 9 11 12 13 18 19 GND TST MYSON TECHNOLOGY RXI I 14 22 22 MTD392 FAMILY CDS I 16 24 24 RX+,RX- O 3 6 3 6 3 6 CD+,CD- O 1 2 1 2 1 2 TXO GND VEE COL, JAB, XMT, RCV, TST- O 15 10 4 5 13 23 4 16 17 5 20 21 23 4 16 17 5 20 21 7 8 11 12 14 Network Receiving Input. Should be connected to the COAX center conductor. Signals meeting receiver squelch limits are recovered and output on RX±/RXI also detects the collision voltage level. Collision Detecting Sense. Connects directly to the COAX shield, providing a reference for the collision detection voltage level for receiving-mode detection. An external bias network can be used to shift the detection threshold for transmissiondetection mode. For hybrid mode collision detection, a 400 W resistor should be connected from CDS to GND. Receiving Data Output. A balanced differential output drives data recovered from the network to the MCC. These outputs are also open sources, and pull-down resistors from 510W to VEE are required. To minimize power dissipation, both open source outputs are disabled during idle conditions, allowing the common mode on the pull-down resistor to be pulled to VEE. Collision Output. A balanced differential line driver drives this output pair from the collision detection circuitry. A 10MHz signal from the internal oscillator is transferred to these outputs in the event of collision or excessive transmission (jabber), or during heartbeat condition. These outputs are open sources, and pull-down resistors from 510W to VEE are required. To minimize power dissipation, both open source outputs are disabled during idle condition, allowing the common mode on the pull-down resistors to be pulled to VEE. Transmitter Output. Should be connected to the coaxial cable via one serial isolation diode for Cheapernet/Thinnet (10 Base2) or 2 serial isolation diodes for Thicknet (10 Base5). Positive Supply Pin (Ground). Should be connected to the COAX shield. Negative Power Supply. -9 volts. A 0.1mF decoupling capacitor must be connected across GND and VEE as close to the device as possible. Transceiver Status Indicators. LED displays for collision, jabber, transmission and reception. These pins are opendrain output buffers that are used to drive LED status indicators. They are designed to supply 8 mA sinking capability. Test Enabler. W hen both TST- and MOD- pins are shorted to VEE, MTDX94 enters into test mode. In this mode, the jabber function is disabled and all state timing is accelerated by 1024 times. This pin has a 50kW internal pull-up resistor. Mode Selection. Along with the TST- pin, determines the collision detection method of MTDX94. If both MOD- and TST- are connected to GND, MTDX94 implements receivingmode collision detection. The typical detection threshold in receiving-mode is -1.53V. To implement transmission-mode collision detection, the detection threshold can be lowered by placing a resistor bias network on the CDS pin. When the TST- pin is connected to GND and the MOD- pin is connected to VEE, MTDX94 uses hybrid-mode for collision detection. In this mode, the threshold is set at -0.42V during idle or MTD392 Revision 2.01 02/25/1997 5/10 O I MOD- I 15 MYSON TECHNOLOGY MTD392 FAMILY receiving operation. During transmission, the detection threshold is increased to -0.42V plus its own transmission level on the CDS pin. When TST- is connected to VEE and MOD- is connected to GND, MTDX94 uses the transmithybrid mode for collision detection. This mode is identical to hybrid-mode, except that during idle or receiving operation, the detection threshold is set at -1.53V. For proper operation of hybrid and transmission-hybrid mode, a 400 W resistor should be connected between the CDS pin and GND. This pin has a 50 kW internal pull-up resistor. 3.0 ABSOLUTE MAXIMUM RATINGS DC Supply Voltage (VEE) Input Voltage Storage Temperature Ambient Operating Temperature ESD Protection except RXI -12V GND+0.3 to VEE-0.3V -65 to 150 C 0 to 70 C 2000V o o o o 4.0 OPERATING CONDITIONS DC Supply Voltage (VEE) Operating Temperature 8.55-9.45V 0 to 70 C o o 5.0 ELECTRICAL CHARACTERISTICS (under operating conditions) (Note 1) Parameter Symbol Recommended Supply Voltage VEE Non-transmitting Supply Current (VEE to GND) IEE Transmission Receiving Input Bias Current (RXI) Irxi Transmitting Output DC Current (TXO) Itdc Transmitting Output AC Current (TXO) Itac Collision Threshold (Receiving Mode) Vcd Vhcd Collision Threshold (Hybrid Mode) (MTDX94 only) Carrier Sense Threshold (RXI) Vcs Vod Differential Output Voltage (RX±,CD±) Voc DC Common Mode Output Voltage (RX±,CD±) (Note2) Vob Idle State Differential Offset Voltage(RX±,CD±) Vts Transmission Squelch Threshold(TX±) (Note 3) Input Capacitance (RXI) Cx Shunt Resistance-Non-transmitting Rrxi Shunt Resistance-Transmitting Rtxo Min -8.55 -2 37 ±28 -1.45 -0.38 -0.38 ±500 -1.0 -175 100 10 Typ -9.0 -25 -70 41 -1.53 -0.45 -0.45 -2.0 0 -225 1.5 Max -9.45 -35 -80 +25 45 Itdc -1.62 -0.52 -0.52 ±1500 -3.0 ±40 -300 Unit V mA mA mA mA mA V V V mV V mV mV pF kW kW Notes:1. Testing is done under the testing load defined in Figure 6. 2. During idle condition, Voc is pulled down to VEE to minimize the power dissipation across the load resistors connected to RX± and CD±pins. 3. For a minimum pulse width of ³40 ns. MTD392 Revision 2.01 02/25/1997 6/10 MYSON TECHNOLOGY 6.0 SWITCHING CHARACTERISTICS (under operating conditions) (Note 1) Parameter Receiving Start-up Delay (RXI to RX±) Receiving Propagation Delay (RXI to RX±) Differential Output Rise Time (RX±,CD±) Differential Output Fall Time (RX±,CD±) Reception and Cable Total Jitter Transmission Start-up Delay Transmission Propagation Delay Transmission Rise Time (10%-90%) (TXO) Transmission Fall Time (10%-90%) (TXO) Ttr and Trf Mismatch Transmission Skew(TXO) Transmission Turn-on Pulse Width at Vts(TX+) (Note 4) Transmission Turn-off Delay Collision Turn-on Delay Collision Turn-off Delay Collision Frequency (CD±) Collision Pulse Width (CD±) CD Heartbeat Delay (TX± to CD±) CD Heartbeat Duration(CD±) Jabber Activation Delay(TX ± to CD±) Jabber Reset Timeout (TX±to TXO and CD±) Notes: 4. For a minimum pulse amplitude of ³ -300 mV. Symbol Tron Trd Trr Trf Trj Ttst Ttd Ttr Ttf Ttm Tts Tton Ttoff Tcon Tcoff Fcp Tcp Thon Thw Tja Tjr Min 20 20 10 130 8.5 40 0.6 0.5 20 300 Typ 2.5 25 4 4 ±2 1 25 25 25 ±0.5 ±0.5 20 200 7 10 50 1.1 1.0 26 420 MTD392 FAMILY Max 5 50 7 7 2 50 30 30 ±3.0 ±2 40 300 13 20 12.5 60 1.6 1.5 32 550 Unit bits ns ns ns ns bits ns ns ns ns ns ns ns bits bits MHz ns ms ms ms ms 7.0 TIMING DIAGRAM FOR MTD392 FAMILY INPUT TO RXI RX+ RXTron 50% 50% Trd Trf 90% 10% Troff Trr Figure 1. Reception Timing TX+ TXTXO OUTPUT 50% Ttidl 10% Vts Tton Ttst 50% Ttd 90% Ttf Ttr Ttoff Figure 2. Transmission Timing TX+ TXCD+ CDThon Thw Figure 3. Heartbeat Timing MTD392 Revision 2.01 02/25/1997 7/10 MYSON TECHNOLOGY INPUT to RXI CD+ CD0V -1.75V Vcd (max) Tcon 1/Fcp Vcd (min) Tcp -6.8V Tcoff MTD392 FAMILY -1.2V Figure 4. Collision Timing TX+ TXTXO Tja Tjr CD+ CD- Figure 5. Jabber Timing 39W Receiver (RX ) TXO Transmitter Output 25W 50mH* Collision(CD ) Outputs 510W 510W + 39W VEE Figure 6. Test Loads MTD392 Revision 2.01 02/25/1997 8/10 MYSON TECHNOLOGY 8.0 PACKAGE DIMENSION FOR 392 FAMILY A. 24-PIN PDIP UNIT: MIL R10Max (4X) 312+/-12 MTD392 FAMILY 80+/-20 350+/-20 250+/-4 R40 55+/-20 930+/-10 1245+/-10 15Max 7Typ 35+/-5 10 65+/-4 65+/-4 115Min 15Min. 100Typ 18+/-2Typ 60+/-5Typ B. 16-PIN PDIP UNIT: MIL 312+/-12 100+/-20 355+/-50 R40 55+/-20 245+/-20 75+/-20 90+/-20 760+/-20 15Max 7Ty p 35+/-5 15Max 60+/-4 10 60+/-4 310Max 130 +/-15 15Min. 100+/-20 18+/-5Typ 60+/-15 MTD392 Revision 2.01 02/25/1997 9/10 MYSON TECHNOLOGY C. 28-PIN PLCC UNIT: INCH 0.045*45 0 PIN #1 HOLE 0.180 MAX. 0.020 MIN. MTD392 FAMILY 0.490 +/-0.005 0.013~0.021 TYP. 0.410 +/-0.02 0.453 +/-0.003 0.300 70TYP. 0.010 0.050 TYP. 0.026~0.032 TYP. 0.453 +/-0.003 0.4902 +/-0.005 0.070 0.070 D. 20-PIN PLCC UNIT: INCH 0.045*45 0 PIN #1 HOLE 0.180 MAX. 0.020 MIN. 0.390 +/-0.005 0.200 0.310 +/-0.02 0.353 +/-0.003 70TYP. 0.010 0.050 TYP. 0.353 +/-0.003 0.390 +/-0.005 0.070 0.070 0.013~0.021 TYP. MTD392 Revision 2.01 02/25/1997 10/10