|
|
PDF MC34055 Data sheet ( Hoja de datos )
| Número de pieza | MC34055 | |
| Descripción | IEEE 802.3 10BASE-T TRANSCEIVER | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MC34055 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
Order this document by MC34055/D
IEEE 802.3 10BASE-T
Transceiver
The Motorola 10BASE–T transceiver, designed to comply with the ISO
8802–3 [IEEE 802.3] 10BASE–T specification, will support a Medium
Dependent Interface (MDI) in an embedded Media Attachment Unit (MAU)*.
The interface supporting the Data Terminal Equipment (DTE) is TTL, CMOS,
and raised ECL compatible, and the interface to the Twisted Pair (TP) media
is supported through standard 10BASE–T filters and transformers.
Differential data intended for the TP media is provided a 50 ns pre–emphasis
and data at the TP receiver is screened by Smart Squelch circuitry for
specific threshold, pulse width, and sequence requirements.
www.DataSheet4U.cOotmher features of the MC34055 include: Collision and Jabber detection
status outputs, select mode pins for forcing Loop Back and Full–Duplex
operation, a Signal Quality Error pin for testing the collision detect circuitry
without affecting the TP output, and a LED driver for Link Integrity status. An
on–chip oscillator, capable of receiving a clock input or operating under
crystal control, is also provided for internal timing and driving a buffered
clock output.
The MC34055 is manufactured on a BiCMOS process and is packaged in
a 24 pin SOIC.
• BiCMOS Technology for Low Power Operation
• Standard 5.0 V, ± 5% Voltage Supply
• Smart Squelch Enforcement of Threshold, Pulse Width, and Sequence
Requirements
• Driver Pre–Emphasis for Output Data
• TTL, CMOS and Raised ECL Compatible
• Interfaces to TP Media with Standard 10BASE–T Filters and
Transformers
• LED Capable Status Outputs for Collision, Jabber Detection, and Link
Integrity
• Directly Driven or Crystal Controlled Clock Oscillator
• Selectable Full–Duplex Operation
• Signal Quality Error Test Pin
• Selectable Loop Back
MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Power Supply Voltage
Differential Voltage at RX+/RX–
Voltage Applied to Logic and Mode/Test
Select Inputs
VCC
VID
– 0.5 to 7.0
– 5.25 to 5.25
– 0.5 to 5.5
Vdc
Vdc
Vdc
Voltage Applied to Logic Outputs and
Output Status Pins
– 0.5 to 7.0 Vdc
Ambient Operating Temperature Range
TA
0 to 70
°C
Junction Temperature
TJ
– 65 to 150
°C
NOTE: Devices should not be operated at these limits. The “Recommended Operating
Conditions” table provides for actual device operation.
MC34055
10BASE–T TRANSCEIVER
SEMICONDUCTOR
TECHNICAL DATA
24
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751E
(SO–24L)
PIN CONNECTIONS
Clk Out 1
TX Data A 2
TX Data B 3
TX EN H 4
Dig. Gnd 5
VCC(Dig/Ana) 6
Ana. Gnd 7
RX Data A 8
RX Data B 9
RX EN H 10
Loop L 11
LNKFL H 12
24 Clk+
23 Clk–
22 SQE EN L
21 TX+
20 TX–
19 Pwr Gnd
18 Pwr VCC
17 FULLD L
16 RX+
15 RX–
14 CTL H
13 JABB H
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC34055DW TA = 0° to +70°C
SO–24L
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 1
1
1 page  
TX EN H
Bit Pattern
TX Data A/B
RX EN H
RX Data A/B
www.DataSheet4U.com
TX+/TX–
MC34055
Figure 1. Start Up and Steady State Transmit Timing
1
tDREL
tTXEN
0
tTXRX
1
0
tPRCM
tSKEW T
tTXSS
tJITTER T
TX Data A/B
Bit Pattern
TX+/TX–
TX EN H
RX EN H
Figure 2. Driver Shutdown Timing
10
585mV
tTXDH
tTDDC
tXTRE
Figure 3. Link Pulse Timing
RX+/RX–
TX+/TX–
tLDCY_A
tLKPW
585mV
585mV
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page 
MC34055
LOOP L Test Mode
If the Loop L pin is low, the MC34055 is in a test mode
whereby the data at the input pin (TX Data A/B) is being
looped back internally to the receive data pin(RX Data A/B).
In this mode the data path from the differential receiver
terminals to the receive data output pins (RX Data A/B) is
disconnected while the Smart Squelch functionality of the
differential receiver is still operational. This test mode allows
the DTE to test the MC34055 internal loop back circuitry
since the data is looped back to the receive circuitry as close
to the twisted pair interface as possible.
Signal Quality Error Test
The MC34055 also provides the ability to test the collision
detect circuitry without disabling either of the data paths. By
pulling the SQE EN L pin low, a collision test is provided to
the collision detect circuitry immediately following the last
www.DataSheet4eUd.gcoemof a transmitted 802.3 frame. The test verifies the
operability of the collision detect circuitry, operability is
announced by the assertion of the CTL H pin for a period
following a valid data transmission.
Jabber Detection
The transmit circuitry of the MC34055 has the ability to
monitor and shut down the differential driver in the event of a
jabber condition. If transmission activity ever exceeds 20 ms
minimum, the differential driver, the collision detect, and
internal loop back circuits are disabled. To announce the
presence of a jabber condition, both the CTL H and the JABB
H status output pins are asserted. In order to end the jabber
condition, the TX Data A/B input must stop toggling, or the TX
EN H pin must be pulled low for a minimum of 500 ms. The
status output pins have the ability to drive an external led and
were added to facilitize network manageability. The jabber
status outputs will not assert during power up or power down.
Full Duplex Mode
The MC34055 can be operated in a full–duplex mode if
required. When the FULLD L pin is pulled low the device will
enter the full duplex mode. This mode allows the transmitter
and driver to operate independently. Collision will not be
announced and the internal loop back operation is disabled.
The Signal Quality Error test, however, is still operational if
enabled.
Status Pins
The MC34055 has three status indicator pins capable of
sourcing or sinking enough current to support an external
LED. Status pin levels (“1” or “0”) report the condition of the
transceiver. Table 2 shows the combinations and
significance.
JABB H
“0”
“1”
X
X
X
Status Pin
CTL H
“1”
“1”
X
X
X
Table 2
LNKFL H
X
X
“0”
“1”
“0101…”
Condition
Collision condition or Signal Quality Error test.
Jabber condition
Link Failure. Incorrect or nonexistent link pulses, or lack of data at the
receiver terminals.
Link “OK”. Receiving link pulses.
Link “OK”. Receiving valid data.
Test Select Pins
The MC34055 has three operation mode test select pins,
Loop L, SQE EN L and FULLD L. The level of the pin
determines the mode of operation. Table 3 shows the levels
and corresponding conditions of the status pins.
Pin
Loop L
SQE EN L
FULLD L
Status
“1”
“0”
“0”
“1”
“1”
“0”
Table 3
Condition
Normal operating mode. Loop back occurs when the transmitter initiates and the receiver is receiving
link pulses. The RX EN H pin follows the TX EN H pin and the transmit data appears on the RX Data
A/B output pin being used.
Loop back test mode. The transmit circuit is looped back internally as close to the differential receive
circuit as possible. In this mode the RX EN H pin follows the TX EN H pin and the transmit data ap-
pears on the RX Data A/B output pin being used. Any received data other than link pulses are ignored
and the receiver will not unsquelch or announce collision.
Normal operating mode. Concurrent transmit and receive activity results in a collision condition.
Test enabled. An internal test is run on the collision circuitry and the CTL H pin is asserted for a time
window following the last positive packet edge. Data transmission and reception is undisturbed.
Normal operating mode. Internal loop–back is operable and collision is announced.
Internal loop–back is disabled and collision will not be announced. Signal Quality Error test is
still operable.
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MC34055.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MC3405 | DUAL OPERATIONAL AMPLIFIER / DUAL VOLTAGE COMPARATOR | Motorola Semiconductors |
| MC34050 | (MC34050 / MC34051) Dual ELA-422/423 Transceivers | Motorola Semiconductors |
| MC34051 | (MC34050 / MC34051) Dual ELA-422/423 Transceivers | Motorola Semiconductors |
| MC34055 | IEEE 802.3 10BASE-T TRANSCEIVER | Motorola Semiconductors |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |