LAN8720A-CP SMSC, LAN8720A-CP Datasheet - Page 11

• Manufacturer Part Number: LAN8720A-CP
• Description: TXRX ETHERNET 10/100 RMII
• Manufacturer: SMSC
• Type: Transceiverr

Specifications of LAN8720A-CP

• Number Of Drivers/receivers: 4/4
• Protocol: RMII
• Voltage - Supply: 1.6 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1080

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720A/LAN8720Ai
NUM PINS
NUM PINS
1
1
Note 2.1
Carrier Sense
Configuration
Regulator Off
Configuration
Data Valid
Operating
/ Receive
Mode 2
NAME
NAME
LED 1
Strap
Strap
PHY
Configuration strap values are latched on power-on reset and system reset. Configuration
straps are identified by an underlined symbol name. Signals that function as configuration
straps must be augmented with an external resistor when connected to a load. Refer to
Section 3.7, "Configuration Straps," on page 31
SYMBOL
SYMBOL
REGOFF
CRS_DV
MODE2
LED1
Table 2.1 RMII Signals (continued)
Table 2.2 LED Pins
DATASHEET
BUFFER
BUFFER
TYPE
TYPE
VO8
(PU)
(PD)
O12
VIS
IS
11
This signal is asserted to indicate the receive
medium is non-idle. When a 10BASE-T packet is
received, CRS_DV is asserted, but RXD[1:0] is
held low until the SFD byte (10101011) is
received.
Note:
Combined with MODE0 and MODE1, this
configuration strap sets the default PHY mode.
See
configuration straps.
Note:
Link activity LED Indication. This pin is driven
active when a valid link is detected and blinks
when activity is detected.
Note:
This configuration strap is used to disable the
internal 1.2V regulator. When the regulator is
disabled, external 1.2V must be supplied to
VDDCR.
See
configuration straps.
Note:
When REGOFF is pulled high to VDD2A with
an external resistor, the internal regulator is
disabled.
When REGOFF is floating or pulled low, the
internal regulator is enabled (default).
Note 2.1
Note 2.2
for additional information.
Per the RMII standard, transmitted data
is not looped back onto the receive data
pins in 10BASE-T half-duplex mode.
Refer to
Mode Configuration," on page 31
additional details.
Refer to
page 37
Refer to
Internal +1.2V Regulator Configuration,"
on page 32
for more information on
for more information on
DESCRIPTION
DESCRIPTION
Section 3.7.2, "MODE[2:0]:
Section 3.8.1, "LEDs," on
for additional LED information.
Section 3.7.3, "REGOFF:
for additional details.
Revision 1.2 (11-10-10)
for