Datasheet

 2016 Microchip Technology Inc. DS00002165B-page 55
LAN8720A/LAN8720AI
5.4 DC Specifications
TABLE 5-2: details the non-variable I/O buffer characteristics. These buffer types do not support variable voltage oper-
ation. TABLE 5-3: 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
High Input Level
Negative-Going Threshold
Positive-Going Threshold
Schmitt Trigger Hysteresis
(V
IHT
- V
ILT
)
Input Leakage
(V
IN
= VSS or VDDIO)
Input Capacitance
V
ILI
V
IHI
V
ILT
V
IHT
V
HYS
I
IH
C
IN
-0.3
1.01
1.39
336
-10
1.19
1.59
399
3.6
1.39
1.79
459
10
2
V
V
V
V
mV
uA
pF
Schmitt trigger
Schmitt trigger
Note 5-9
O12 Type Buffers
Low Output Level
High Output Level
V
OL
V
OH
VDD2A -
0.4
0.4 V
V
I
OL
= 12mA
I
OH
= -12mA
ICLK Type Buffer
(XT
AL1 Input)
Low Input Level
High Input Level
V
ILI
V
IHI
-0.3
0.9
0.35
3.6
V
V
Note 5-10
Note 5-12 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 5-13 XT
AL1/CLKIN can optionally be driven from a 25MHz single-ended clock oscillator.