LAN8720A-CP-TR Standard Microsystems (SMSC), LAN8720A-CP-TR Datasheet - Page 70

• Manufacturer Part Number: LAN8720A-CP-TR
• Description: SMALL FOOTPRINT RMII 10/100 ETHERNET TR
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN8720A-CP-TR

• Number Of Receivers: 1
• Protocols Supported: IEEE 802.3
• Operating Supply Voltage (typ): 1.8/2.5/3.3V
• Package Type: QFN
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Operating Temperature (max): 85C
• Operating Temperature (min): 0C
• Lead Free Status / Rohs Status: Compliant

Revision 1.0 (12-09-09)
5.5.4
5.5.4.1
SYMBOL
t
t
t
t
t
ohold
t
ihold
clkp
clkh
oval
t
clkl
REFCLKO
su
RXD[1:0]
CRS_DV
TXD[1:0]
RMII Interface Timing
RMII Timing (REF_CLK Out Mode)
The 50MHz REF_CLK OUT timing applies to the case when nINTSEL is pulled-low. In this mode, a
25MHz crystal or clock oscillator must be input on the XTAL1/CLKIN and XTAL2 pins. For more
information on REF_CLK Out Mode, see
TXEN
Note 5.16 Timing was designed for system load between 10 pf and 25 pf.
REFCLKO period
REFCLKO high time
REFCLKO low time
TXD[1:0], TXEN output valid from rising edge of
REFCLKO
TXD[1:0], TXEN output hold from rising edge of
REFCLKO
RXD[1:0], CRS_DV setup time to rising edge of
REFCLKO
RXD[1:0], CRS_DV input hold time after rising
edge of REFCLKO
t
ihold
Table 5.9 RMII Timing Values (REF_CLK Out Mode)
DESCRIPTION
t
Figure 5.4 RMII Timing (REF_CLK Out Mode)
ohold
t
su
t
DATASHEET
t
ihold
t
val
clkh
t
Section 3.7.4.2, "REF_CLK Out Mode," on page
clkp
70
t
clkl
t
su
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
t
t
t
t
ihold
clkp
clkp
val
MIN
2.0
4.0
1.5
20
*0.4
*0.4
t
t
clkp
clkp
MAX
14.0
*0.6
*0.6
t
t
ohold
ihold
SMSC LAN8720/LAN8720i
t
UNITS
val
ns
ns
ns
ns
ns
ns
ns
t
su
Note 5.16
Note 5.16
Note 5.16
Note 5.16
34.
NOTES
Datasheet