Datasheet

 2013-2015 Microchip Technology Inc. DS00001987A-page 115
LAN8740A/LAN8740Ai
5.5 DC Specifications
Table 5-4 details the non-variable I/O buffer characteristics. These buffer types do not support variable voltage opera-
tion. Table 5-5 details the variable voltage I/O buffer characteristics. Typical values are provided for 1.8 V, 2.5 V, and 3.3
V VDDIO cases.
Note 1: This specification applies to all inputs and tri-stated bi-directional pins. Internal pull-down and pull-up resis-
tors add ±50 µA per-pin (typical).
2: XTAL1/CLKIN can optionally be driven from a 25 MHz single-ended clock oscillator.
TABLE 5-4: NON-VARIABLE I/O BUFFER CHARACTERISTICS
Parameter Symbol Min. Typ. Max. Unit Note
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
µA
pF
Schmitt trigger
Schmitt trigger
(see Note 1)
O12 Type Buffers
Low Output Level
High Output Level
V
OL
V
OH
VDD2A - 0.4
0.4 V
V
I
OL
= 12 mA
I
OH
= -12 mA
ICLK Type Buffer
(XTAL1 Input)
Low Input Level
High Input Level
V
ILI
V
IHI
-0.3
VDDCR-0.35
0.35
3.6
V
V
(see Note 2)