Datasheet

1.0 Pin Descriptions (Continued)
12 www.national.com
1.8 Power And Ground Pins
The power (V
CC
) and ground (GND) pins of the DP83843
are grouped in pairs into three categories--TTL/CMOS
Input pairs, Transmit/Receive supply pairs, and Internal
supply pairs. This grouping allows for optimizing the layout
and filtering of the power and ground supplies to this
device.
1.9 Special Connect Pins
Signal Name Pin # Description
TTL/CMOS INPUT/OUTPUT SUPPLY PAIRS
IO_VDD1
IO_VSS1
6
7
TTL Input/Output Supply #1
IO_VDD2
IO_VSS2
16
17
TTL Input/Output Supply #2
IO_VDD3
IO_VSS3
26
27
TTL Input /Output Supply #3
IO_VSS4 32 TTL Input/Output Supply #4
IO_VDD5
IO_VSS5
36
37
TTL Input/ Output Supply #5
PCS_VDD
PCS_VSS
10
11
Physical Coding Sublayer Supply
TRANSMIT/RECEIVE SUPPLY PAIRS
AUIFX_VDD
AUIFX_GND
46
45
AUI Power Supply
TR_AVDD
TR_AGND
79
80
10 Mb/s Supply
TW_AVDD
TW_AGND
68
64
100 Mb/s Power Supply
CD_VDD0
CD_GND0
72
71
Common Driver Supply
CD_VDD1
CD_GND1
76
75
Common Driver Supply
INTERNAL SUPPLY PAIRS
CP_AVDD
CP_AGND
52
51
CRM/CGM Supply
CPTW_DVDD
CPTW_DVSS
54
53
CRM/CGM Supply
ATP_GND 57 100BASE-T PMD Supply
SUB_GND1,
SUB_GND2
70
77
100BASE-T PMD Supply
Signal Name Type Pin # Description
NC 2,55,56,
58,59,
62
NO CONNECT: These pins are reserved for future use. Leave them unconnected
(floating).