LAN8720A-CP-TR Standard Microsystems (SMSC), LAN8720A-CP-TR Datasheet - Page 68

• 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)
5.5.2
SYMBOL
t
t
pon
poff
Magnetics
VDD1A,
Power Sequence Timing
This diagram illustrates the device power sequencing requirements. The VDDIO, VDD1A, VDD2A and
magnetics power supplies can turn on in any order provided they all reach operational levels within
the specified time period t
0 volts within the specified time period p
Note: When the internal regulator is disabled, a power-up sequencing relationship exists between
VDD2A
VDDIO
Power supply turn on time
Power supply turn off time
Power
VDDCR and the 3.3V power supply. For additional information refer to
"REGOFF: Internal +1.2V Regulator Configuration," on page
Table 5.7 Power Sequence Timing Values
DESCRIPTION
Figure 5.2 Power Sequence Timing
pon
t
pon
. Device power supplies can turn off in any order provided they all reach
DATASHEET
off
.
68
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
MIN
32.
t
poff
TYP
SMSC LAN8720/LAN8720i
MAX
500
50
Section 3.7.3,
Datasheet
UNITS
mS
mS