ML4644 Datasheet, PDF (1/11 Pages) Micro Linear Corporation – 4 Port AUI Multiplexer

GENERAL DESCRIPTION
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.
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.
BLOCK DIAGRAM
April 1997
ML4644*
4 Port AUI Multiplexer
FEATURES
s IEEE 802.3 compliant AUI interfaces assure
compatibility with any AUI ready devices.
s On-chip Jabber logic, Collision Detection,
and SQE test with enable/disable option.
s Selectable SQE Test
s Selectable loopback
s Ten network status LED outputs.
* This Part Is End Of Life As Of August 1, 2000
TxIN1N
55
56 ^TxIN1P
21 ^RxOUT1N
20 ^RxOUT1P
54 ^CDOUT1N
53 ^CDOUT1P
SQEN1
64
MAU
AUI
INTERFACE
TxIN2N
10
TxIN2P
7
RxOUT2N
24
RxOUT2P
23
CDOUT2N
2
CDOUT2P
1
MAU
AUI
INTERFACE
SQEN2
31
TxIN3N
12
TxIN3P
11
RxOUT3N
34
RxOUT3P
33
CDOUT3N
5
CDOUT3P
4
MAU
AUI
INTERFACE
SQEN3
32
46 ^TxIN4N
47 ^TxIN4P
37 ^RxOUT4N
36 ^RxOUT4P
59 ^CDOUT4N
58 ^CDOUT4P
MAU
AUI
INTERFACE
44 ^SQEN4
67 66 61
X2 X1 X3
OSCILLATOR
17
RRESET
BIASING
25
26
VCC VCC
MUX
DTE
AUI
INTERFACE
TxOUTP
15
TxOUTN
14
RxINP
29
RxINN
30
CDINP
63
CDINN
60
LED DRIVERS
GND
22
3
51 50 49 48 45 19 39 41
52
1