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LAN91C111-NC (IC216)
D5
103
D4
104
GND
105
D3
106
D2
107
D1
108
D0
109
GND
110
111
TX25
VDD
112
TXEN100
113
COL100
114
TXD3
115
116
TXD2
TXD1
117
TXD0
118
GND
119
RX25
120
121
CRS100
VDD
122
RXD3
123
RXD2
124
RXD1
125
RXD0
126
RX_DV
127
RX_ER
128
LAN91C111-NC Terminal Function
Pin No.
Name
11
EEPROM Clock
12
EEPROM Select
9
EEPROM Data Out
10
EEPROM Data In
5-7
I/O Base
Enable
8
EEPROM
Crystal1
1,2
Crystal2
3, 35, 46,
67, 79, 100,
Power
112, 122
13, 18
Analog Power
26, 41, 54,
59, 69, 74, 95, Ground
105, 110, 119
15,21
Analog Ground
23
Loopback
22
nLink Status
30
nCNTRL
49
X25out
Transmit
113
Enable 100 Mbps
Carrier Sense
121
100 Mbps
TOP VIEW
Buffer
Symbol
Type
Output. 4 µsec clock used to shift data in and out of the serial EEPROM.
EESK
O4
Output. Serial EEPROM chip select. Used for selection and command framing
EECS
O4
of the serial EEPROM.
EEDO
O4
Output. Connected to the DI input of the serial EEPROM.
I with
EEDI
Input. Connected to the DO output of the serial EEPROM.
pulldown**
IOS0-
I with
Input. External switches can be connected to these lines to select between
IOS2
pullup** predefined EEPROM configurations.
I with
Input. Enables (when high or open) LAN91C111 accesses to the serial EEPROM.
ENEEP
pullup** Must be grounded if no EEPROM is connected to the LAN91C111.
An external 25 MHz crystal is connected across these pins. If a TTL clock is
XTAL1
supplied instead, it should be connected to XTAL1 and XTAL2 should be left
lclk**
XTAL2
open. XTAL1 is the 5V tolerant input of the internal amplifier and XTAL2 is the
output of the internal amplifier.
VDD
+3.3V Power supply pins.
AVDD
+3.3V Analog power supply pins.
GND
Ground pins.
AGND
Analog Ground pins.
LBK
O4
Output. Active when LOOP bit is set (TCR bit1).
I with
nLNK
Input. General-purpose input port used to convey LINK status (EPHSR bit 14).
pullup
nCNTRL
O12
General Purpose Control Pin.
X25out
O12
25MHz Output to external PHY.
TXEN100
O12
Output to MII PHY. Envelope to 100 Mbps transmission.
I with
Input from MII PHY. Envelope of packet reception used for deferral and backoff
CRS100
pulldown purposes.
64
VDD
63
D20
62
D21
61
D22
60
D23
59
GND
58
D24
57
D25
56
D26
55
D27
54
GND
53
D28
52
D29
51
D30
50
D31
49
X25OUT
48
nRDYRTN
47
nLDEV
46
VDD
45
nSRDY
44
LCLK
43
AEN
42
nVLBUS
41
GND
40
ARDY
39
nADS
Description
DN-V1700
19
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