MTD393 [ETC]
Coaxial Transceiver Interface; 同轴电缆收发器接口
| 型号： | MTD393 |
| 厂家： | 
ETC |
| 描述： | Coaxial Transceiver Interface |
| 文件： | 总10页 (文件大小：283K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MTD392
FAMILY
MYSON
TECHNOLOGY
Coaxial Transceiver Interface
FEATURES
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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:
Package
Product
Features
Basic transceiver
Recommended Applications
Types
16-PDIP
28-PLCC
20-PLCC
24-PDIP
24-PDIP
28-PLCC
MTD392
Adapter boards
MTD393
MTD394
MTD392 with built-in LEDs
Adapter cards with status LEDs
MTD393 with enhanced collision
detection mode, special pin for
testing
MTD393 applications with enhanced
collision detection
MTD49X
MTD39X with improved
performance
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
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MTD392
FAMILY
MYSON
TECHNOLOGY
BLOCK DIAGRAM FOR MTD392 FAMILY
COAX
RX+
RX-
AUI
DRIVER
HIGH PASS
COM
EQUALIZATION
LOW PASS
FILTER
FXI
CD+
CD-
AUI
DRIVER
-
+
CARRIER
SENSE
GND
LOW PASS
FILTER
TX+
TX-
125
10K
XMT
COLLISION
-
+
VEE
CDS
LOW PASS
FILTER
RECV
TXO
+
-
WAVEFORM
SHAPING
DC/AC
SQUELCH
CLK
10MHz
OSC
WATCH DOG
TIMER 26ms
JABBER RESET
TIMER 0.4sec
XMTSQ
VEE
RR+
REFERENCE
CIRCUIT
1K
RECEIVE
STATE
MACHINE
TRANSMIT
STATE
MACHINE
RR-
HBE
Block Diagram for MTDX92
COAX
RX+
RX-
AUI
DRIVER
HIGH PASS
EQUALIZATION
COM
LOW PASS
FILTER
FXI
CD+
CD-
AUI
DRIVER
-
+
CARRIER
SENSE
GND
LOW PASS
FILTER
TX+
TX-
125
XMT
10K
VEE
COLLISION
-
+
CDS
LOW PASS
FILTER
RECV
TXO
+
-
WAVEFORM
SHAPING
DC/AC
SQUELCH
XMTSQ
CLK
10MHz
OSC
WATCH DOG
TIMER 26ms
JABBER RESET
TIMER 0.4sec
VEE
JAB
RR+
REFERENCE
CIRCUIT
XMT
COL
RCV
1K
TRANSMIT
STATE
MACHINE
RECEIVE
STATE
MACHINE
RR-
HBE
Block Diagram for MTDX93
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MTD392
FAMILY
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TECHNOLOGY
COAX
RX+
RX-
AUI
DRIVER
HIGH PASS
COM
EQUALIZATION
LOW PASS
FILTER
FXI
CD+
CD-
AUI
DRIVER
-
+
CARRIER
SENSE
GND
LOW PASS
FILTER
TX+
TX-
COLLISION
125
-
+
LOW PASS
FILTER
XMT
10K
VEE
CDS
MODE
RECV
TXO
+
-
WAVEFORM
SHAPING
DC/AC
SQUELCH
XMTSQ
CLK/1024
10MHz
OSC
WATCH DOG
TIMER 26ms
JABBER RESET
TIMER 0.4sec
16X 1X
CLK
TEST
JAB
RR+
REFERENCE
CIRCUIT
XMT
COL
RCV
1K
TRANSMIT
STATE
MACHINE
RECEIVE
STATE
MACHINE
RR-
LED DRIVER
MODHBETEST
Block Diagram for MTDX94
1.0 CONNECTION DIAGRAM
(1) MTDX92 Pin Diagram
VEE
VEE
VEE
VEE(NC)
VEE
CD+
CD-
RX+
VEE
VEE
RX-
TX+
TX-
CDS
TX0
RXI
1
2
3
4
5
6
7
8
16
15
14
VEE
VEE
RR-
MTD392N13
MTD392V
28 PIN PLCC
VEE
VEE(NC)
VEE(NC)
VEE(NC)
VEE
16 PIN PDIP
12
VEE
RR+
GND
HBE
11
10
9
VEE(NC)
RR-
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MTD392
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TECHNOLOGY
(2) MTDX93 Pin Diagram
1
24
23
22
21
20
19
18
17
16
15
14
13
CD+
CD-
CDS
TX0
RXI
2
3
RX+
GND
VEE
RX-
4
VEE
VEE
RR-
RR+
GND
GND
NC
GND
VEE
RX-
RXI
5
VEE
RR-
RR+
GND
6
MTD393N
24 PIN PDIP
(300 MIL)
MTD393V
20 PIN PLCC
7
COL
JAB
TX+
TX-
COL
JAB
8
9
10
11
12
XMT
RCV
NC
HBE
(3) MTDX94 Pin Diagram
CD+
CD-
1
2
3
4
5
6
7
8
9
24
23
22
21
20
CDS
TX0
RX+
GND
VEE
RX-
RXI
RX+
GND
VEE
RX-
RXI
VEE
VEE
RR-
VEE
VEE
VEE
RR-
19
18
17
16
15
14
13
MTD394N
24 PIN PDIP
(300 MIL)
MTD394V
28 PIN PLCC
COL
JAB
TX+
RR+
GND
GND
MOD~
TST~
HBE
COL
JAB
TX+
RR+
GND
TX- 10
XMT 11
RCV 12
2.0 PIN DESCRIPTIONS
MTD MTD MTD
X92 X93 X94
PIN# PIN# PIN#
Name
I/O
Description
TX+,TX-
I
7
8
9
10
9
10
Transmission Data Input. A balanced differential line
receiver that receives input from the off-chip Manchester
Code Converter (MCC) to the Transmitter. The common
mode voltage on TX± is set internally.
HBE
I
I
9
13
13
Heartbeat Enabler. The CD heartbeat test is enabled when
HBE is connected to Ground and disabled when HBE is
connected to VEE.
External Resistor. A 1kW,/1% resistor should be connected
across these pins to correctly set internal operating currents.
RR+ is internally shorted to GND.
RR+,RR-
11
12
18
19
18
19
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RXI
I
I
14
16
22
24
22
24
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 transmission-
detection mode. For hybrid mode collision detection, a 400W
resistor should be connected from CDS to GND.
CDS
RX+,RX-
CD+,CD-
O
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 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.
1
2
1
2
1
2
TXO
GND
VEE
O
15
10
23
23
4
4
16
17
5
20
21
16
17
5
20
21
4
5
13
Negative Power Supply. -9 volts. A 0.1mF 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
I
14
15
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 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
MOD-
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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 transmit-
hybrid 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
o
o
-65 to 150 C
o
o
0 to 70 C
2000V
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
Recommended Supply Voltage
Non-transmitting Supply Current (VEE to GND)
Transmission
Symbol
VEE
IEE
Min
-8.55
-
-
-2
Typ
-9.0
-25
-70
-
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
Receiving Input Bias Current (RXI)
Transmitting Output DC Current (TXO)
Transmitting Output AC Current (TXO)
Collision Threshold (Receiving Mode)
Collision Threshold (Hybrid Mode) (MTDX94 only)
Carrier Sense Threshold (RXI)
Differential Output Voltage (RX±,CD±)
DC Common Mode Output Voltage (RX±,CD±) (Note2)
Idle State Differential Offset Voltage(RX±,CD±)
Transmission Squelch Threshold(TX±) (Note 3)
Input Capacitance (RXI)
Irxi
Itdc
Itac
Vcd
Vhcd
Vcs
Vod
Voc
Vob
Vts
37
41
-
±28
-1.45
-0.38
-0.38
±500
-1.0
-
-175
-
100
10
-1.53
-0.45
-0.45
-
-2.0
0
-225
1.5
-
Cx
Rrxi
Rtxo
Shunt Resistance-Non-transmitting
Shunt Resistance-Transmitting
-
-
-
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.
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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
Symbol
Tron
Trd
Trr
Trf
Trj
Ttst
Ttd
Ttr
Ttf
Ttm
Tts
Tton
Ttoff
Tcon
Tcoff
Fcp
Tcp
Thon
Thw
Tja
Min
-
-
-
-
-
-
-
Typ
2.5
25
4
4
±2
1
25
25
25
±0.5
±0.5
20
200
7
Max
Unit
bits
ns
ns
ns
ns
bits
ns
ns
ns
ns
ns
ns
ns
bits
bits
MHz
ns
ms
ms
5
50
7
7
-
2
50
30
30
±3.0
±2
40
300
13
20
12.5
60
1.6
1.5
32
550
20
20
-
-
10
130
-
-
-
8.5
40
0.6
0.5
20
300
10
50
1.1
1.0
26
420
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±)
ms
ms
Tjr
Notes: 4. For a minimum pulse amplitude of ³ -300 mV.
7.0 TIMING DIAGRAM FOR MTD392 FAMILY
INPUT
TO RXI
50%
Troff
Tron
Trd
Trf
90%
10%
RX+
RX-
50%
Trr
Figure 1. Reception Timing
TX+
TX-
50%
Ttidl
Ttoff
Vts
Tton
Ttst
Ttd
90%
10%
TXO
OUTPUT
50%
Ttf
Ttr
Figure 2. Transmission Timing
TX+
TX-
Thon
Thw
CD+
CD-
Figure 3. Heartbeat Timing
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0V
-1.75V
-1.2V
INPUT
to RXI
Vcd (max)
Tcon
Vcd (min)
Tcp
-6.8V
Tcoff
1/Fcp
CD+
CD-
Figure 4. Collision Timing
TX+
TX-
Tja
TXO
Tjr
CD+
CD-
Figure 5. Jabber Timing
39W
Receiver (RX )
TXO
Transmitter
Output
50mH*
39W
25
W
+
-
Collision(CD )
Outputs
510W
510W
VEE
Figure 6. Test Loads
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8.0 PACKAGE DIMENSION FOR 392 FAMILY
A. 24-PIN PDIP
UNIT: MIL
R10Max
(4X)
312+/-12
55+/-20
80+/-20
350+/-20
250+/-4
R40
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
55+/-20
100+/-20
355+/-50
R40
245+/-20
75+/-20
90+/-20
60+/-4
10
60+/-4
310Max
760+/-20
7Ty
p
15Max
35+/-5
15Max
130 +/-15
15Min.
100+/-20
18+/-5Typ
60+/-15
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C. 28-PIN PLCC
UNIT: INCH
0.045*450
0.180 MAX.
PIN #1 HOLE
0.020 MIN.
0.490 +/-0.005
0.013~0.021 TYP.
0.410 +/-0.02
0.453 +/-0.003
0.300
70TYP.
0.070
0.010
0.050 TYP.
0.026~0.032 TYP.
0.453 +/-0.003
0.070
0.4902 +/-0.005
D. 20-PIN PLCC
UNIT: INCH
PIN #1 HOLE
0.045*450
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.
0.070
0.010
0.050 TYP.
0.353 +/-0.003
0.390 +/-0.005
0.070
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