LAN8720A-CP-TR Standard Microsystems (SMSC), LAN8720A-CP-TR Datasheet - Page 71

• 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

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720/LAN8720i
5.5.4.2
SYMBOL
t
t
t
t
t
ohold
t
ihold
(REF_CLK)
clkp
clkh
oval
t
clkl
su
RXD[1:0]
CRS_DV
TXD[1:0]
CLKIN
RMII Timing (REF_CLK In Mode)
The 50MHz REF_CLK IN timing applies to the case when nINTSEL is floated or pulled-high. In this
mode, a 50MHz clock must be input on the CLKIN pin. For more information on REF_CLK In Mode,
see
Note 5.17 Timing was designed for system load between 10 pf and 25 pf.
TXEN
CLKIN period
CLKIN high time
CLKIN low time
TXD[1:0], TXEN output valid from rising edge of
CLKIN
TXD[1:0], TXEN output hold from rising edge of
CLKIN
RXD[1:0], CRS_DV setup time to rising edge of
CLKIN
RXD[1:0], CRS_DV input hold time after rising
edge of CLKIN
Section 3.7.4.1, "REF_CLK In Mode," on page
t
ihold
Table 5.10 RMII Timing Values (REF_CLK In Mode)
DESCRIPTION
t
Figure 5.5 RMII Timing (REF_CLK In Mode)
ohold
t
su
DATASHEET
t
t
ihold
t
val
clkh
t
clkp
71
t
clkl
t
su
34.
t
t
t
clkp
clkp
t
ihold
val
MIN
3.0
4.0
1.5
20
*0.35
*0.35
t
t
clkp
clkp
MAX
14.0
*0.65
*0.65
t
t
ohold
ihold
UNITS
t
Revision 1.0 (12-09-09)
val
ns
ns
ns
ns
ns
ns
ns
t
su
Note 5.17
Note 5.17
Note 5.17
Note 5.17
NOTES