MTD392 FAMILY MYSON TECHNOLOGY Coaxial Transceiver Interface FEATURES · · · · · · · · · · · · 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 Features MTD392 Basic transceiver MTD393 MTD392 with built-in LEDs MTD394 MTD393 with enhanced collision detection mode, special pin for testing MTD39X with improved performance MTD49X 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 MTD392 FAMILY MYSON TECHNOLOGY BLOCK DIAGRAM FOR MTD392 FAMILY COAX HIGH PASS EQUALIZATION LOW PASS FILTER FXI GND 125 + LOW PASS FILTER RX+ AUI DRIVER COM RXCD+ AUI DRIVER CARRIER SENSE CDTX+ XMT TX- 10K VEE CDS LOW PASS FILTER RECV COLLISION + TXO + - WAVEFORM SHAPING 10MHz CLK OSC VEE WATCH DOG TIMER 26ms DC/AC SQUELCH JABBER RESET XMTSQ TIMER 0.4sec RR+ REFERENCE CIRCUIT 1K RECEIVE STATE MACHINE TRANSMIT STATE MACHINE RR- HBE Block Diagram for MTDX92 COAX HIGH PASS EQUALIZATION LOW PASS FILTER FXI GND 125 + LOW PASS FILTER RX+ AUI DRIVER COM CARRIER SENSE RXCD+ AUI DRIVER CDTX+ XMT TX- 10K VEE CDS + LOW PASS FILTER RECV TXO COLLISION + - WAVEFORM SHAPING DC/AC SQUELCH XMTSQ VEE 10MHz CLK OSC WATCH DOG TIMER 26ms JAB RR+ 1K RR- JABBER RESET TIMER 0.4sec REFERENCE CIRCUIT TRANSMIT STATE MACHINE RECEIVE STATE MACHINE XMT COL RCV HBE Block Diagram for MTDX93 MTD392 Revision 2.01 02/25/1997 2/10 MTD392 FAMILY MYSON TECHNOLOGY COAX HIGH PASS EQUALIZATION LOW PASS FILTER FXI GND 125 CDS RXCD+ AUI DRIVER CARRIER SENSE CDTX+ + LOW PASS FILTER XMT 10K VEE + LOW PASS FILTER RX+ AUI DRIVER COM COLLISION TX- MODE RECV TXO + - WAVEFORM SHAPING DC/AC SQUELCH XMTSQ CLK/1024 16X 10MHz OSC 1X CLK WATCH DOG TIMER 26ms JABBER RESET TIMER 0.4sec TEST JAB RR+ REFERENCE CIRCUIT 1K TRANSMIT STATE MACHINE RR- XMT RECEIVE STATE MACHINE COL LED DRIVER RCV MOD HBE TEST Block Diagram for MTDX94 1.0 CONNECTION DIAGRAM RXI NC TXD CDS CD+ CD- RX+ (1) MTDX92 Pin Diagram CD+ 1 16 CDS VEE VEE(NC) CD- 2 15 TX0 VEE VEE 14 RXI 13 VEE RX+ 3 VEE 4 MTD392N VEE 5 16 PIN PDIP 12 RX- 6 11 RR+ TX+ 7 10 TX- 8 9 RR- VEE VEE MTD392V VEE VEE 28 PIN PLCC RRRR+ VEE(NC) GND HBE GND VEE(NC) HBE VEE(NC) TX- GND TX+ VEE RX- VEE(NC) MTD392 Revision 2.01 02/25/1997 3/10 MTD392 FAMILY MYSON TECHNOLOGY CD- TX0 RX+ 3 22 RXI GND 4 21 VEE GND VEE 5 20 VEE VEE RX- 6 MTD393N 19 RR- COL 7 24 PIN PDIP (300 MIL) 18 RR+ JAB 8 17 GND TX+ 9 16 GND TX- 10 15 NC XMT 11 14 NC RCV 12 13 HBE TXO CDS 23 CDS 24 2 CD+ 1 RX+ CD+ CD- (2) MTDX93 Pin Diagram RXI VEE MTD393V RX- RR- 20 PIN PLCC TX- XMT RCV HBE CD- CD+ GND GND GND JAB TX+ RR+ GND COL TXD CDS (3) MTDX94 Pin Diagram CD+ 1 24 CDS CD- 2 23 TX0 RX+ 3 22 RXI RX+ RXI GND 4 21 VEE GND VEE VEE 5 20 VEE VEE RX- 6 MTD394N 19 RR- COL 7 24 PIN PDIP (300 MIL) 18 RR+ JAB 8 17 GND TX+ 9 16 GND TX- 10 15 MOD~ XMT 11 14 TST~ RCV 12 13 HBE VEE MTD394V RX- VEE 28 PIN PLCC GND MOD GND TST TX+ HBE RR+ RCV JAB XMT RR- TX- COL 2.0 PIN DESCRIPTIONS MTD X92 PIN# 7 8 MTD X93 PIN# 9 10 I 9 13 I 11 12 18 19 Name I/O TX+,TX- I HBE RR+,RR- 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 MYSON TECHNOLOGY RXI I 14 22 22 CDS I 16 24 24 RX+,RX- O 3 6 3 6 3 6 CD+,CD- O 1 2 1 2 1 2 TXO O 15 23 23 GND 10 VEE 4 5 13 4 16 17 5 20 21 4 16 17 5 20 21 7 8 11 12 COL, JAB, XMT, RCV, O TST- I 14 MOD- I 15 MTD392 FAMILY 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 400W 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. When 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 MTD392 FAMILY MYSON TECHNOLOGY 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 MTD392 FAMILY 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±) 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 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 Notes: 4. For a minimum pulse amplitude of ³ -300 mV. 7.0 TIMING DIAGRAM FOR MTD392 FAMILY INPUT TO RXI 50% Tron RX+ RX- Trd 50% Trf Troff 90% 10% Trr Figure 1. Reception Timing TX+ TXTXO OUTPUT Ttidl 50% Vts Tton Ttst Ttd 90% 50% Ttoff 10% Ttf Ttr Figure 2. Transmission Timing TX+ TXCD+ CD- Thon Thw Figure 3. Heartbeat Timing MTD392 Revision 2.01 02/25/1997 7/10 MTD392 FAMILY MYSON TECHNOLOGY INPUT to RXI CD+ CD- 0V -1.75V -1.2V Vcd (max) Vcd (min) 1/Fcp Tcon -6.8V Tcoff Tcp Figure 4. Collision Timing TX+ TX- Tja TXO Tjr CD+ CD- Figure 5. Jabber Timing 39W Receiver (RX ) TXO Transmitter Output 50mH* 25W 39W + Collision(CD- ) Outputs 510W 510W VEE Figure 6. Test Loads MTD392 Revision 2.01 02/25/1997 8/10 MTD392 FAMILY MYSON TECHNOLOGY 8.0 PACKAGE DIMENSION FOR 392 FAMILY A. 24-PIN PDIP UNIT: MIL R10Max (4X) 312+/-12 80+/-20 R40 350+/-20 250+/-4 55+/-20 10 930+/-10 65+/-4 65+/-4 1245+/-10 7Typ 15Max 35+/-5 115Min 15Min. 100Typ 18+/-2Typ 60+/-5Typ B. 16-PIN PDIP UNIT: MIL 312+/-12 100+/-20 R40 355+/-50 245+/-20 55+/-20 75+/-20 60+/-4 90+/-20 10 60+/-4 310Max 760+/-20 7Ty p 15Max 35+/-5 15Max 130 +/-15 15Min. 100+/-20 18+/-5Typ 60+/-15 MTD392 Revision 2.01 02/25/1997 9/10 MTD392 FAMILY MYSON TECHNOLOGY C. 28-PIN PLCC UNIT: INCH PIN #1 HOLE 0.045*45 0 0.180 MAX. 0.020 MIN. 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. 0.070 0.070 0.453 +/-0.003 0.4902 +/-0.005 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 0.013~0.021 TYP. 70TYP. 0.010 0.050 TYP. 0.353 +/-0.003 0.070 0.070 0.390 +/-0.005 MTD392 Revision 2.01 02/25/1997 10/10