Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
5.4
DC Specifications
Table 5.3 details the non-variable I/O buffer characteristics. These buffer types do not support variable
voltage operation. Table 5.4 details the variable voltage I/O buffer characteristics. Typical values are
provided for 1.8V, 2.5V, and 3.3V VDDIO cases.
Table 5.3 Non-Variable I/O Buffer Characteristics
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
IS Type Input Buffer
Low Input Level
VILI
VIHI
-0.3
V
V
High Input Level
3.6
1.39
1.79
459
Negative-Going Threshold
Positive-Going Threshold
Schmitt Trigger Hysteresis
VILT
VIHT
VHYS
1.01
1.39
336
1.19
1.59
399
V
Schmitt trigger
Schmitt trigger
V
mV
(VIHT - VILT
)
Input Leakage
IIH
-10
10
2
uA
pF
Note 5.8
(VIN = VSS or VDDIO)
Input Capacitance
O12 Type Buffers
CIN
Low Output Level
High Output Level
VOL
VOH
0.4
V
V
IOL = 12mA
VDD2A - 0.4
IOH = -12mA
Note 5.9
ICLK Type Buffer
(XTAL1 Input)
Low Input Level
High Input Level
VILI
VIHI
-0.3
1.4
0.35
V
V
VDD2A + 0.4
Note 5.8 This specification applies to all inputs and tri-stated bi-directional pins. Internal pull-down
and pull-up resistors add +/- 50uA per-pin (typical).
Note 5.9 XTAL1/CLKIN can optionally be driven from a 25MHz single-ended clock oscillator.
Revision 1.4 (08-23-12)
66
SMSC LAN8720A/LAN8720Ai
DATASHEET
SMSC [ SMSC CORPORATION ]
