Micro Linear ML4644CQ 4 port aui multiplexer Datasheet

April 1997
ML4644*
4 Port AUI Multiplexer
GENERAL DESCRIPTION
FEATURES
The ML4644 AUI Multiplexer contains all the necessary
drivers/receivers and control logic to implement a 4 port
MAU when used in conjuction with a transceiver chip
which has a standard 802.3 AUI interface. Several
ML4644s can be cascaded together to implement an 8 or
12 port MAU or standalone device.
■
IEEE 802.3 compliant AUI interfaces assure
compatibility with any AUI ready devices.
■
On-chip Jabber logic, Collision Detection,
and SQE test with enable/disable option.
■
Selectable SQE Test
■
Selectable loopback
■
Ten network status LED outputs.
Logic within the ML4644 detects collisions resulting from
multiple DTEs transmitting simultaneously. In addition,
collision signals received from a transceiver attached at
the MAU port are propagated to all of the DTE ports.
Jabbering DTEs are prevented from loading down the
network by an internal jabber timer which disables
babbling ports.
* This Part Is End Of Life As Of August 1, 2000
BLOCK DIAGRAM
67
55
56
21
20
54
53
TxIN1P
RxOUT1N
RxOUT1P
CDOUT1N
66
61
X2 X1
TxIN1N
17
OSCILLATOR
MAU
AUI
INTERFACE
25
RRESET
X3
VCC
26
VCC
BIASING
CDOUT1P
SQEN1
64
33
5
4
32
46
47
37
36
59
58
44
TxIN3N
TxIN3P
RxOUT3N
RxOUT3P
CDOUT3N
RxINP
RxINN
CDINP
CDINN
MAU
AUI
INTERFACE
15
14
29
30
63
60
CDOUT3P
SQEN3
TxIN4N
TxIN4P
RxOUT4N
RxOUT4P
MAU
AUI
INTERFACE
LED DRIVERS
CDOUT4N
CDOUT4P
JAB4
34
DTE
AUI
INTERFACE
JAB3
11
MUX
SQEN2
JAB2
12
TxOUTN
JAB1
31
TxOUTP
CDOUT2P
Tx4
1
CDOUT2N
MAU
AUI
INTERFACE
Tx3
2
RxOUT2P
Tx2
23
RxOUT2N
Tx1
24
TxIN2P
COLL
7
TxIN2N
REC
10
SQEN4
GND
22
3
51
50
49
48
45
19
39
41
52
1
ML4644
CDOUT2N
CDOUT2P
NC
3
2
1
68 67 66 65 64 63 62 61
X3
COLL
4
NC
CDOUT3P
5
CDINP
CDOUT3N
6
SQEN1
NC
7
NC
TxIN2P
8
X1
NC
9
X2
NC
PIN CONNECTIONS
TxIN2N 10
60 CDINN
TxIN3P 11
59 CDOUT4N
TxIN3N 12
58 CDOUT4P
NC 13
57 NC
TxOUTN 14
56 TxIN1P
TxOUTP 15
55 TxIN1N
RESERVED 16
54 CDOUT1N
RRSET 17
53 CDOUT1P
ML4644
NC 18
52 GND
JAB2 19
51 Tx1
RxOUT1P 20
50 Tx2
RxOUT1N 21
49 Tx3
REC 22
48 Tx4
RxOUT2P 23
47 TxIN4P
RxOUT2N 24
46 TxIN4N
VCC 25
45 JAB1
VCC 26
44 SQEN4
NC
NC
JAB4
NC
JAB3
NC
RxOUT4N
RxOUT4P
NC
RxOUT3N
RxOUT3P
SQEN3
SQEN2
RxINN
RxINP
NC
NC
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
PIN DESCRIPTION
PIN #
NAME
FUNC.
DESCRIPTION
PIN #
NAME
1
CDOUT2P
Output
Collision signal pair for
DTE port 2.
13
NC
14
TxOUTN
Output
2
CDOUT2N
Output
Collision signal pair for
DTE port 2.
Transmit signal pair for
MAU port.
15
TxOUTP
Output
3
COLL
Output
Open collector LED
driver for collision.
Transmit signal pair for
MAU port.
16
Reserved
4
CDOUT3P
Output
Collision signal pair for
DTE port 3.
17
RRSET
5
CDOUT3N
Output
Collision signal pair for
DTE port 3.
6
NC
No connection.
18
NC
7
TxIN2P
Transmit signal pair for
DTE port 2.
19
JAB2
Output
8
NC
No connection.
Open collector jabber
LED driver for Jabber of
DTE port 2.
9
NC
No connection.
20
RxOUT1P
Output
Receive signal pair for
DTE port 1.
10
TxIN2N
Input
Transmit signal pair for
DTE port 2.
21
RxOUT1N Output
Receive signal pair for
DTE port 1.
11
TxIN3P
Input
Transmit signal pair for
DTE port 3.
22
REC
12
TxIN3N
Input
Transmit signal pair for
DTE port 3.
Open collector LED
driver for receive.
Grounding this pin
enables loopback.
2
Input
FUNC.
DESCRIPTION
No connection.
This pin should be tied
to VCC.
Input
Bias setting external
resistor, 61.9ký,
connected to VCC
No connection.
Output
ML4644
PIN DESCRIPTION (Continued)
PIN #
NAME
FUNC.
DESCRIPTION
PIN #
NAME
FUNC.
DESCRIPTION
23
RxOUT2P
Output
Receive signal pair for
DTE port 2.
48
Tx4
Output
24
RxOUT2N Output
Receive signal pair for
DTE port 2.
Open collector transmit
LED driver for Jabber of
DTE port 4.
49
Tx3
Output
Open collector transmit
LED driver for Jabber of
DTE port 3.
50
Tx2
Output
Open collector transmit
LED driver for Jabber of
DTE port 2.
51
Tx1
Output
Open collector transmit
LED driver for Jabber of
DTE port 1.
52
GND
Ground
Ground.
53
CDOUT1P
Output
Collision signal pair for
DTE port 1.
54
CDOUT1N
Output
Collision signal pair for
DTE port 1.
55
TxIN1N
Input
Transmit signal pair for
DTE port 1.
Input
Transmit signal pair for
DTE port 1.
25
VCC
Power
+5V power supply.
26
VCC
Power
+5V power supply.
27
NC
No connection.
28
NC
No connection.
29
RxINP
Input
Receive signal pair for
MAU port.
30
RxINN
Input
Receive signal pair for
MAU port.
31
SQEN2
Input
Active low. This pin is
used to enable the SQE
function of DTE port 2.
32
SQEN3
Input
Active low. This pin is
used to enable the SQE
function of DTE port 3.
33
RxOUT3P
Output
Receive signal pair for
DTE port 3.
56
TxIN1P
34
RxOUT3N Output
Receive signal pair for
DTE port 3.
57
NC
58
CDOUT4P
Output
35
NC
No connection.
Collision signal pair for
DTE port 4.
36
RxOUT4P
Output
Receive signal pair for
DTE port 4.
59
CDOUT4N
Output
Collision signal pair for
DTE port 4.
37
RxOUT4N Output
Receive signal pair for
DTE port 4.
60
CDINN
Input
Collision signal pair for
MAU port.
38
NC
No connection.
61
X3
Output
39
JAB3
ECL output driven by
crystal. Can drive X1
inputs on other
ML4644S.
40
NC
62
NC
41
JAB4
63
CDINP
Input
Collision signal pair for
MAU port.
64
SQEN1
Input
Active low. This pin is
used to enable the SQE
function of DTE port 1.
Output
Open collector jabber
LED driver for Jabber of
DTE port 3.
No connection.
Output
Open collector jabber
LED driver for Jabber of
DTE port 4.
No connection.
No connection.
42
NC
No connection.
43
NC
No connection.
65
NC
44
SQEN4
Input
Active low. This pin is
used to enable the SQE
function of DTE port 4.
66
X1
Input
45
JAB1
Output
Open collector jabber
LED driver for Jabber of
DTE port 1.
46
TxIN4N
Input
Transmit signal pair for
DTE port 4.
10MHz Crystal input pin.
This pin can also be used
as a 10MHz clock input
pin, or can connect to X3
of another that is driven
by a crystal or 10MHz
clock.
67
X2
Input
10 MHz Crystal input pin.
47
TxIN4P
Input
Transmit signal pair for
DTE port 4.
68
NC
No connection.
No connection.
3
ML4644
ABSOLUTE MAXIMUM RATINGS
OPERATING CONDITIONS
Absolute maximum ratings are limits beyond which the
life of the integrated circuit may be impaired. All voltages
unless otherwise specified are measured with respect to
ground.
Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . 5V ± 10%
RRSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.9ký ± 1%
Power Supply Voltage Range VCC . . . GND –0.3 to +6.0V
Input Current RRSET, All LED Driver Pins . . . . . . . 60mA
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150°C
Storage Temperature . . . . . . . . . . . . . . . . –65°C to 150°C
Lead Temperature (Soldering 10 seconds) . . . . . . . 260°C
Thermal Resistance (qJA) . . . . . . . . . . . . . . . . . . . 44°C/W
ELECTRICAL CHARACTERISTICS
Unless otherwise specified TA = 0°C to 70°C, VCC = 5V ± 10%. (Notes 1, 2)
PARAMETER
CONDITIONS
Power Supply Current ICC (Note 3)
VCC = 5V
LED Drivers: VOL
RL=510ý (Note 4)
MIN
TYP.
MAX
UNITS
50
150
190
mA
0.8
V
–200
mV
±1200
mV
Transmit Squelch Voltage Level (Tx+, Tx–)
–300
Differential Output Voltage
±550
Common Mode Output Voltage
4.0
Differential Output Voltage Imbalance
Loopback Enable
Note 1:
Note 2:
Note 3:
4
–250
2
REC tied low
Limits are guaranteed by 100% testing , sampling, or correlation with worst-case test conditions.
Low Duty cycle pulse testing is performed at TA.
This does not include the current from the AUI pull down resistors or the LED output pins.
V
±40
mV
0.3
V
ML4644
AC ELECTRICAL CHARACTERISTICS
SYMBOLS
PARAMETER
MIN
TYP.
MAX
UNITS
200
ns
TRANSMIT
tXODY
Transmitter Turn-On Delay
100
tTXSDY
Transmit Steady State Prop. Delay
15
ns
tTXFPW
Transmit Turn-Off Pulse Width
180
ns
tTXSOI
Transmit Turn-Off Start of Idle
250
ns
200
RECEIVE
tRXODY
Receive Turn-On Delay
100
tRXSDY
Receive Steady State Prop. Delay
15
ns
tRXFPW
Receive Turn-Off Pulse Width
180
ns
tRXSOI
Receive Turn-Off Start of Idle
250
ns
tAR
Differential Output Rise Time
20% to 80% (Rx±, COL±, TxOUT±)
3
ns
tAF
Differential Output Fall Time
20% to 80% (Rx±, COL±, TxOUT±)
3
ns
200
200
ns
COLLISION
tCPSQE
Collision Present to SQE Assert
0
200
ns
tSQEXR
Time for SQE to Deactivate After a Collision
0
500
ns
FCLF
Collision Frequency
XTAL Controlled
8.5
10
11.5
MHz
Collision Pulse Duty Cycle
XTAL Controlled
40
50
60
%
FJAM
JAM Frequency at TxOUT±
XTAL Controlled
tSQEDY
SQE Test Delay (Tx Inactive to SQE)
0.6
1.1
1.6
µs
tSQETD
SQE Test Duration
0.5
1.0
1.5
µs
7
13.5
20
ms
5
MHz
JABBER, LINK TEST AND LED TIMING
tJAD
Jabber Activation Delay
tJSQE
Delay from Outputs Disabled to Collision Oscillator On
tLEDT
REC, COLL, Tx1, Tx2, Tx3, Tx4 On Time
100
0.3
1.0
ns
3.0
ms
5
ML4644
TIMING DIAGRAMS
TxINP
VALID
DATA
TxINN
tTxODY
tTxFPW
tTxSDY
tAR
TxOUTP
VALID
tAF
tXSOI
DATA
TxOUTN
tTxLP
RxOUTP
RxOUTN
Figure 3. Transmit Timing
tRXFPN
RxINP
VALID
RxINN
DATA
tRXSDY
tRXODY
tAR
RxOUT1, 2, P
VALID
tAF
tRXSOI
DATA
RxOUT1, 2, N
Figure 4. Receive Timing
TxIN2P
VALID
TxIN2N
TxIN1P
VALID
TxIN1N
DATA
DATA
tCPSQE
FCLK
CDOUT1, 2, P
CS0
CDOUT1, 2, N
FJAM
TxOUTP
TxIN2
TxIN2
TxIN2
JAM
JAM
TxOUTN
Figure 5. Collision Timing
6
ML4644
TIMING DIAGRAMS (Continued)
TxIN1P
TxIN1N
TxIN2P
VALID
DATA
TxIN2N
tSQEXR
CDOUT1, 2, P
CS0
CDOUT1, 2, N
TxOUTP
JAM
TxOUTN
tXIN2P
JAM
tXIN2P
Figure 6. Collision Timing
TxIN1P
TxIN1N
VALID DATA
tSQETD
tSQETDY
CS0
CDOUT1P
CDOUT1N
CDOUT2P
CDOUT2N
Figure 7. SQE Timing
TxIN1P
TxIN1N
VALID
DATA
tJAD
TxOUT1P
VALID
DATA
TxOUT1N
tJSQE
CDOUT1P
CDOUT1N
Figure 8. Jabber Timing
7
ML4644
TxOUT1P
TxOUT1N
tLETD
TxLED1
Figure 9. LED Timing
8
ML4644
FUNCTIONAL DESCRIPTION
Figure 1 is a block diagram of a Four Port Multiplexer
using the ML4644. All AUI interfaces are transformer
coupled as required in an AUI connection.
RECEPTION
The receive function consists of detecting data on receive
differential data input pair of the MAU port (RxIN) and
transmitting this data out of the RxOUT ports of all the DTE
port. This data will only be passed onto the DTE port if it
meets the unsquelch criteria of the AUI receiver circuit. This
provision prevents any noise on the AUI cable from being
misinterpreted as data and transmitted to the RxOUT pins.
The receiver squelch circuit rejects signal typically with
pulse width less than 20ns or a voltage level more positive
than –250mV. Once the receiver is unsquelched, it
remains so until reception of the idle signal which is more
positive than –170mV for longer than 180ns.
TRANSMISSION
The transmit function consists of detecting data on any of
the four differential data input pairs (TxIN1, TxIN2, TxIN3,
and TxIN4) and transmitting this data out of the TxOUT
pair of the MAU port.
Only data that meets the unsquelch criteria of the AUI
receiver circuit will be passed onto the TxOUT port.
LOOPBACK
If the ML4644 is connected to a MAU, or connected to
other 4642/44s that are connected to a MAU, the MAU
should be used to provide loopback. The loopback function
of the MAU will loop data back to the RxIN port which will
pass is to all FxOUTs and the REC pin will go low. In some
configurations, there will be no MAU, and a ML4644 will
be the last chip in the Tx path. In this case, the RxIN port
will never be active, since it is not connected, and the REC
pin has no function. The REC pin may be grounded and this
will put the ML4644 in loopback mode, and data on the
TxIN pair will be looped back to all RxOUT ports.
COLLISION
There are two possible collision scenarios.
1. Collision from the network connected to the MAU.
2. Collision between two or more DTEs attached to the
multiplexer.
In the case of a network collision, the MAU will send a
collision presence signal to the multiplexer. The ML4644
will propagate this signal to the CDOUT pins of each of the
DTE ports. The collision signal is a 10MHz ±0.01% signal.
When a collision event occurs between two or more DTE
ports, the ML4644 will send the collision presence signal to
each of the DTEs via the collision ports. At the same time a
5MHz JAM signal is sent to the network.
SQE TEST FUNCTION
The Signal Quality Error (SQE) test function allows the
DTE to determine whether or not the collision port is
functional. After each transmission, during the interpacket
gap time, the collision signal will be activated on the
CDOUT port of the same DTE port data has been
transmitted, for typically 1µs. The SQE function is not
activated at the DTE ports that are in jabber state. The SQE
function of each port can be disabled by tying the SQEN
pin high.
JABBER FUNCTION
The jabber function prevents a malfunction transmitter
from continuous transmission and thus loaded down the
network. Within the ML4644, there is a jabber timer. The
timer starts at the beginning of a received packet and
resets at the end of each packet. If the packet lasts longer
than 7 to 20ms the jabber circuit will disable the
offending TxIN receiver (the transmission of excessively
long packet is thus terminated) and generates a collision
signal to the collision port of the offending DTE port. The
DTE port will exit the jabber state when the transmission
goes idle.
LED DRIVERS
The ML4644 has ten LED drivers. Each DTE port has a
transmit LED and a jabber LED and the MAU port has a
receive LED. Additionally there is a collision LED which
indicates the presence of a collision condition. All LED
drivers are active low open collector driver.
All LED drivers except the jabber have pulse 1ms pulse
stretchers. The pulse stretchers provide adequate on time
for the LED to be visible.
CASCADING THE ML4644 FOR EIGHT PORT
MULTIPLEXER APPLICATION
An 8 port multiplexer can be realized by using two
ML4644s and one ML4642. In this configuration (see fig.
2), the SQE function of the ML4642 should be disabled to
prevent false collision signalling. The SQE function in this
configuration is performed by each DTE port of the
ML4644 independently. Only one crystal is required,
since X3 of the ML4644 with the crystal can drive X1 of
the other chip.
ML4644
ML4642
ML4644
Figure 2. Block Diagram of an Eight port Multiplexer.
9
ML4644
39
TxIN1P
VCC
TxIN1N
VCC
+5V
39
0.1
.01
0.1µF
RxOUT1P
+5V
RTSET
61.9K
RxOUT1N
360Ω
360Ω
TxOUTP
CDOUT1P
TxOUTN
CDOUT1N
360Ω
360Ω
360Ω
TxIN2P
RxINP
TxIN2N
RxINN
RxOUT2P
CDINP
RxOUT2N
CDINN
360Ω
39
39
39
39
CDOUT2P
VCC
SQEN1
CDOUT2N
ML4644
SQEN2
TxIN3P
SQEN3
TxIN3N
SQEN4
RESERVED
X1
10pF
RxOUT3P
RxOUT3N
10MHz
X2
5pF
5pF
X3
CDOUT3P
CDOUT3N
510
JAB1
JAB2
510
+5V
+5V
510
TxIN4P
TxIN4N
+5V
JAB3
510
JAB4
510
Tx1
Tx2
RxOUT4P
Tx3
RxOUT4N
510
510
510
Tx4
CDOUT4P
CDOUT4N
COLL
REC
Figure 1. Four Port AUI Multiplexer.
10
510
270
+5V
+5V
+5V
+5V
+5V
+5V
+5V
ML4644
PHYSICAL DIMENSIONS
inches (millimeters)
Package: Q68
68-Pin PLCC
0.985 - 0.995
(25.02 - 25.27)
0.042 - 0.056
(1.07 - 1.42)
0.950 - 0.956
(24.13 - 24.28)
0.025 - 0.045
(0.63 - 1.14)
(RADIUS)
1
PIN 1 ID
0.042 - 0.048
(1.07 - 1.22)
18
52
0.800 BSC
(20.32 BSC)
0.950 - 0.956 0.985 - 0.995
(24.13 - 24.28) (25.02 - 25.27)
0.890 - 0.930
(22.61 - 23.62)
35
0.007 - 0.008
(0.18 - 0.20)
0.050 BSC
(1.27 BSC)
0.165 - 0.180
(4.06 - 4.57)
0.026 - 0.032
(0.66 - 0.81)
0.013 - 0.021
(0.33 - 0.53)
0.146 - 0.154
(3.71 - 3.91)
0.095 - 0.118
(2.41 - 3.00)
SEATING PLANE
ORDERING INFORMATION
PART NUMBER
TEMPERATURE RANGE
PACKAGE
ML4644CQ (EOL)
0°C to 70°C
68-Pin PLCC (Q68)
© Micro Linear 1997
is a registered trademark of Micro Linear Corporation
Products described in this document may be covered by one or more of the following patents, U.S.: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017;
5,559,470; 5,565,761; 5,592,128; 5,594,376; Japan: 2598946; 2619299. Other patents are pending.
Micro Linear reserves the right to make changes to any product herein to improve reliability, function or
design. Micro Linear does not assume any liability arising out of the application or use of any product
described herein, neither does it convey any license under its patent right nor the rights of others. The
circuits contained in this data sheet are offered as possible applications only. Micro Linear makes no
warranties or representations as to whether the illustrated circuits infringe any intellectual property rights of
others, and will accept no responsibility or liability for use of any application herein. The customer is urged
to consult with appropriate legal counsel before deciding on a particular application.
2092 Concourse Drive
San Jose, CA 95131
Tel: 408/433-5200
Fax: 408/432-0295
DS4644-01
11
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