Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
5.2
Operating Conditions**
Supply Voltage (VDDIO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+1.62V to +3.6V
Analog Port Supply Voltage (VDD1A, VDD2A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+3.0V to +3.6V
Digital Core Supply Voltage (VDDCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+1.14V to +1.26V
Ethernet Magnetics Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+2.25V to +3.6V
Ambient Operating Temperature in Still Air (TA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Note 5.4
**Proper operation of the device is guaranteed only within the ranges specified in this section. After
the device has completed power-up, VDDIO and the magnetics power supply must maintain their
voltage level with +/-10%. Varying the voltage greater than +/-10% after the device has completed
power-up can cause errors in device operation.
Note: Do not drive input signals without power supplied to the device.
5.3
Power Consumption
This section details the device power measurements taken over various operating conditions. Unless
otherwise noted, all measurements were taken with power supplies at nominal values (VDDIO, VDD1A,
VDD2A = 3.3V, VDDCR = 1.2V). See Section 3.8.3, "Power-Down Modes," on page 38 for a
description of the power down modes. For more information on the REF_CLK modes, see Section
3.7.4, "nINTSEL: nINT/REFCLKO Configuration," on page 33.
5.3.1
REF_CLK In Mode
Table 5.1 Device Only Current Consumption and Power Dissipation (REF_CLK In Mode)
VDDA3.3
POWER
PINS(mA)
VDDCR
POWER
PIN(mA)
VDDIO
POWER
PIN(mA)
TOTAL
CURRENT
(mA)
TOTAL
POWER
(mW)
POWER PIN GROUP
Max
Typical
Min
28
26
23
21
19
18
0.6
0.5
0.3
49
45
41
159
148
100BASE-TX /W TRAFFIC
10BASE-T /W TRAFFIC
96
Note 5.6
Max
Typical
Min
9.7
8.9
8.3
13
12
12
0.6
0.5
0.3
24
22
20
77
70
42
Note 5.6
Max
Typical
Min
4.2
4.1
3.9
3.0
1.9
1.9
0.2
0.2
0
7.4
6.2
5.8
25
21
ENERGY DETECT POWER
DOWN
16
Note 5.6
Max
Typical
Min
0.4
0.3
0.3
2.8
1.8
1.7
0.2
0.2
0
3.4
2.3
2
11.2
7.6
GENERAL POWER DOWN
3.0
Note 5.6
Revision 1.4 (08-23-12)
64
SMSC LAN8720A/LAN8720Ai
DATASHEET
SMSC [ SMSC CORPORATION ]
