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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 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
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 CDpins. 3. For a minimum pulse width of 40 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 (TXto TXO and CD) Notes: 4. For a minimum pulse amplitude of -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

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