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PDF MTD49x Data sheet ( Hoja de datos )
| Número de pieza | MTD49x | |
| Descripción | (MTDxxx) Coaxial Transceiver Interface | |
| Fabricantes | Myson | |
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MYSON
TECHNOLOGY
Coaxial Transceiver Interface
MTD392
FAMILY
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
MTD49X
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.
1/10
MTD392 Revision 2.01 02/25/1997
1 page  
MYSON
TECHNOLOGY
MTD392
FAMILY
RXI I 14
CDS
I 16
RX+,RX- O
3
6
CD+,CD- O
1
2
TXO O 15
GND
10
VEE
4
5
13
COL, O
JAB,
XMT,
RCV,
TST- I
MOD- I
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.
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 400W
resistor should be connected from CDS to GND.
3 3 Receiving Data Output. A balanced differential output drives
6 6 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.
1 1 Collision Output. A balanced differential line driver drives
2 2 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.
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).
4 4 Positive Supply Pin (Ground). Should be connected to the
16 16 COAX shield.
17 17
5 5 Negative Power Supply. -9 volts. A 0.1mF decoupling
20 20 capacitor must be connected across GND and VEE as close
21 21 to the device as possible.
7 Transceiver Status Indicators. LED displays for collision,
8 jabber, transmission and reception. These pins are open-
11 drain output buffers that are used to drive LED status
12 indicators. They are designed to supply 8 mA sinking
capability.
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 50kW internal pull-up resistor.
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
MTD392 Revision 2.01 02/25/1997
5/10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MTD49x.PDF ] | |
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