dp83902a National Semiconductor Corporation, dp83902a Datasheet - Page 7

• Manufacturer Part Number: dp83902a
• Description: St-nictm Serial Network Interface Controller For Twisted Pair
• Manufacturer: National Semiconductor Corporation

NETWORK INTERFACE PINS (Continued)
POWER SUPPLY PINS (DIGITAL)
POWER SUPPLY PINS (ANALOG)
NO CONNECTION
19 24 35 38
40 44 53 54
57 62 67 78
3 9 13 16
2 0 Pin Description
20 34 48
21 46 89
91 94 97
Pin No
76 77
82 83
84 85
68 90
PQFP
75
87
88
93
92
63
66
61
60
81
86
80
79
2 26 39
1 27 47
Pin No
24 25
PLCC
73 74
78 79
80 81
49 64
65 66
72
83
84
60
63
59
58
77
82
76
75
4
3
17 32 46
19 24 33
38 41 44
51 52 53
68 70 73
78 91 94
1 5 8 16
18 43 87
Pin No
74 75
80 81
82 83
64 88
AVJG
72
85
86
90
89
60
63
59
58
79
84
77
76
97
(Continued)
AUI
TPI
TX
TX
RX
RX
CD
CD
SNISEL
CRS
RX
V
GND
V
GND
V
GND
V
GND
V
GND
V
GND
NC
Name
CC
CC
CC
CC
CC
CC
Pin
b
a
b
a
b
a
I O
O
O
I
I
I
I
AUI TPI SELECT A TTL level active high input that selects either the
AUI interface or the TPI module for interface with the ENDEC module
When high the AUI is selected when low the TPI is selected
AUI TRANSMIT OUTPUT Differential driver which sends the encoded
data to the transceiver The outputs are source followers which require
270X pulldown resistors
AUI RECEIVE INPUT Differential receive input pair from the
transceiver
AUI COLLISION INPUT Differential collision pair input from the
transceiver
FACTORY TEST INPUT For normal operation tied to V
enables the ENDEC module to be tested independently of the
DP83902A module
CARRIER SENSE RECEIVE A TTL MOS level active high signal It is
asserted for approximately 50 ms whenever valid transmit or receive
data is detected while in AUI mode or receive data is detected while in
TPI mode
POSITIVE 5V SUPPLY PINS
NEGATIVE (GROUND) SUPPLY PINS It is suggested that a
decoupling capacitor be connected between the V
VCO 5V SUPPLY PIN Care should be taken to reduce noise on this
pin as it supplies power to the analog VCO to the Phase Lock Loop
VCO GROUND SUPPLY PIN Care should be taken to reduce noise on
this pin as it supplies ground to the analog VCO to the Phase Lock
Loop
TPI RECEIVE 5V SUPPLY Power pin supplies 5V to the Twisted Pair
Interface Receiver
TPI RECEIVE GROUND Ground pin for the Twisted Pair Interface
Receiver
TPI TRANSMIT 5V SUPPLY Power pin supplies 5V to the Twisted Pair
Interface Transmitter
TPI TRANSMIT GROUND Ground pin for the Twisted Pair Interface
Transmitter
AUI RECEIVE 5V SUPPLY Power pin supplies 5V to the AUI Interface
Receiver
AUI RECEIVE GROUND Ground pin for the AUI Interface Receiver
AUI TRANSMIT 5V SUPPLY Power pin supplies 5V to AUI Interface
Transmitter
AUI TRANSMIT GROUND Ground pin for the AUI Interface
Transmitter
NO CONNECTION Do not connect to these pins
7
Description
CC
and GND pins
CC
When low