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PDF MTD214 Data sheet ( Hoja de datos )
| Número de pieza | MTD214 | |
| Descripción | Ethernet Encoder/Decoder and 10BaseT Transceiver with Built-in Waveform Shaper | |
| Fabricantes | Myson | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MTD214 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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MYSON
TECHNOLOGY
MTD214
Ethernet Encoder/Decoder and 10BaseT
Transceiver with Built-in Waveform Shaper
FEATURES
· Compatible with IEEE 802.3 standards.
· Built-in UTP output waveform shaping function.
· Selectable media interface and auto-detection functions.
· Automatic polarity detection and correction.
· Link status output.
· Heartbeat disable/enable selection.
· Support full-duplex operation.
· Standard 802.3 AUI interface.
· Selectable controller interface.
· Low power consumption.
GENERAL DESCRIPTION
MTD214 contains integrated functions of the Ethernet encoder/decoder and UTP/AUI interface. The
encoder/decoder conforms to IEEE 802.3 protocol and performance requirements while also retaining
compatibility with most popular network controllers. The UTP transceiver has a built-in waveform shaping
function thus eliminating the requirement of an external filter. The transceiver also contains the functions of
automatic media selection and polarity correction. MTD214 is available in 28-pin plastic DIP (600mil) or SOJ
(300mil) packages.
BLOCK DIAGRAM
CRS
RXC
RXD
COL/HBE
TXE
TXD
TXC
VCO/PLL
MANCHESTER
DECODER
MANCHESTER
ENCODER
AUI
2 DIP/DIN
2 CIP/CIN
2 DOP/DON
UTP RECEIVE
2
TPIP/TPIN
LINK TEST/
JABBER
LTE/LS
NIS
CIS
CONTROL
FDX
X1 REFERENCE
X2 CLOCK
UTP TRANSMIT
OUTPUT
DRIVER
2 TPOP/
TPON
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.
MTD214 Revision 1.4 1205/1997
1/11
1 page  
MYSON
TECHNOLOGY
MTD214
cycle signals between 3MHz and 15 MHz as well as continuous signals below 2.5MHz. The squelch circuit also
recognizes the link pulses. Once the squelch is off, the differential signal is amplified to logic levels. There is no
internal bias of TPIP and TPIN signals; an external bias (2.5V) should be applied to these inputs through the
termination resistors.
3.6 Link Test and Jabber Logic
The link test circuit performs the necessary link test functions specified by IEEE 802.3. The link test function is
enabled when LTE/LS is sampled high during reset period. If the link test function is enabled, the LTE/LS pin
becomes an output that can drive the link LED display. To disable the link test function, LTE should be tied low.
The link test function can be changed only by power-on and off. Note that if the link test is disabled, the
generation of link pulses is not affected. The link test status is used to control the on-chip UTP transceiver and
the media selection. If the link test fails, and auto detection mode is enabled, the media is set to AUI. The link
test circuit also includes the polarity detection function. Detection is based on the polarity of received link
pulses. If 8 consecutive reversed link pulses are received, the polarity is toggled. The jabber logic monitors the
length of the continuous transmission time. If the transmission time exceeds the maximum jabber time, the
transmission is disabled and COL is asserted to indicate the jabber status. In addition, the logic implements the
heartbeat function. The heartbeat enable signal is latched during reset period from the COL pin. To enable the
heartbeat function, an external pull-up resistor of 4.7K Ohms should be connected to the COL pin. To disable
the heartbeat function, a pull-down resistor should be used.
3.7 UTP Transmission and Output Driver
The UTP transmission circuit takes the Manchester decoded data and converts it into a coded format that
meets IEEE 802.3-required transmission templates. The coded data is fed into an oversampling D/A and filters
for waveform shaping. The output buffer of the transmitter is an open-drain type current source. The output
voltage of the transmitter is developed on the external load resistors (50 Ohm) connected to the power supply.
The output should be transformer-coupled to the UTP media.
3.8 AUI Interface
The AUI interface consists of CI/DI squelch detection and receiving circuits, and a DO output driver. The CI/ DI
inputs should be externally biased at 2.5V through the termination resistors, and transformer-coupled to the
AUI media. The DO output is a push-pull driver. The output should have an equivalent load of 39 Ohm to
ensure proper amplitude. AUI media is selected either by setting NIS low or in auto switching mode with link
fail conditions.
4.0 ELECTRICAL CHARACTERISTICS
4.1 DC Characteristics Ta = 0C to 70 C, VDD = 5V +/- 5%, Vss = 0V
Parameter
Supply current
Idle
Traffic
Input low voltage (digital inputs)
Input high voltage (digital inputs)
Input high current (digital inputs)
Input low current (digital inputs)
Output low voltage (digital outputs/w
IOL=4mA)
Output high voltage (digital outputs/w
IOH=500uA)
AUI output differential voltage
(DOP,DON)
AUI idle offset voltage
AUI input squelch voltage
Symbol
Idd, idle
Idd, traf
VIL
VIH
IIH
IIL
VOL
VOH
VOD
VAI
VAS
Min
-
-
-0.3
2.4
-
-
-
3.0
+/-500
-
-175
Typ
20
30
-
-
-
-
0.5
3.5
-
0
-250
5/11
Max
Unit Note
30
40
0.8
Vdd+0.3
100
100
0.8
mA
mA
V
V
uA
uA
V
-V
+/-1500 mV
1
+/-40
mV
-300
mV 2
MTD214 Revision 1.4 12/05/1997
5 Page 
MYSON
TECHNOLOGY
MTD214
Figure 10. Specific Timing for RXC and TXC
5.0 APPLICATION CIRCUITS
Please see attachment.
6.0 PACKAGE DIMENSION
A. 600 MIL 28-PIN PDIP
Unit: mil
1540 +/-10
35+/-5
100Min.
50Typ.
18+/-2Typ.
2050 +/-10
100Typ.
7Typ.
612 +/-12 550 +/-4
6o +/-3o
5o~70
650 +/-20
10
1.778mm
+/-0.127
0.254mm
(min.)
70 +/-4
70 +/-4
B. 300 MIL 28-PIN SOJ
UNIT: INCH
28
1
0.725+/-0.01
0.050 bsc
15 0.007~0.013
0.300 +/-0.005
0.335 bsc
R0.030"
0.040"
0.267
14
0.1 ref
0.025" Min.
0.138 +/-0.01
0.082Min.
0.026"/0.032"
0.05" Max.
0.018 +/-0.002
11/11
MTD214 Revision 1.4 12/05/1997
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MTD214.PDF ] | |
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