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MTD49X Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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MTD49X Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
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5 / 10 page  MYSON TECHNOLOGY MTD392 FAMILY MTD392 Revision 2.01 02/25/1997 5/10 RXI I 14 22 22 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. CDS I 16 24 24 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 transmission- detection mode. For hybrid mode collision detection, a 400 W resistor should be connected from CDS to GND. RX+,RX- O 3 6 3 6 3 6 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 510 W 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. CD+,CD- O 1 2 1 2 1 2 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 510 W 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. TXO O 15 23 23 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). GND 10 4 16 17 4 16 17 Positive Supply Pin (Ground). Should be connected to the COAX shield. VEE 4 5 13 5 20 21 5 20 21 Negative Power Supply. -9 volts. A 0.1 mF decoupling capacitor must be connected across GND and VEE as close to the device as possible. COL, JAB, XMT, RCV, O 7 8 11 12 Transceiver Status Indicators. LED displays for collision, jabber, transmission and reception. These pins are open- drain output buffers that are used to drive LED status indicators. They are designed to supply 8 mA sinking capability. TST- I 14 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 50k W internal pull-up resistor. MOD- I 15 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 receiving- mode 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 |
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