Datasheet

TABLE 5-4: VARIABLE I/O BUFFER CHARACTERISTICS
Parameter Symbol Min
1.8V
Typ
2.5V
Ty
p
3.3V
Typ
Max Units Notes
VIS Type Input Buffer
Low Input Level
High Input Level
Neg-Going Threshold
Pos-Going Threshold
Schmitt Trigger Hyster-
esis (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
0.64
0.81
102
-10
0.83
0.99
158
1.15
1.29
136
1.41
1.65
138
3.6
1.76
1.90
288
10
2
V
V
V
V
mV
uA
pF
Schmitt trigger
Schmitt trigger
Note 5-11
VO8 Type Buffers
Low Output Level
High Output Level
V
OL
V
OH
VDDIO -
0.4
0.4 V
V
I
OL
= 8mA
I
OH
= -8mA
VOD8 Type Buffer
Low Output Level V
OL
0.4 V I
OL
= 8mA
LAN8720A/LAN8720AI
DS00002165B-page 56  2016 Microchip Technology Inc.
Note 5-14 This specification applies to all inputs and tri-stated bi-directional pins. Internal pull-down and pull-up
resistors add +/- 50uA per-pin (typical).
TABLE 5-5: 100BASE-TX TRANSCEIVER CHARACTERISTICS
Parameter Symbol Min Typ Max Units Notes
Peak Differential Output Voltage High V
PPH
950 — 1050 mVpk Note 5-12
Peak Differential Output Voltage Low V
PPL
-950 — -1050 mVpk Note 5-12
Signal Amplitude Symmetry V
SS
98 — 102 % Note 5-12
Signal Rise and Fall Time T
RF
3.0 — 5.0 nS Note 5-12
Rise and Fall Symmetry T
RFS
— — 0.5 nS Note 5-12
Duty Cycle Distortion D
CD
35 50 65 % Note 5-13
Overshoot and Undershoot V
OS
— — 5 % —
Jitter — — — 1.4 nS Note 5-14
Note 5-15 Measu
red at line side of transformer, line replaced by 100 (+/- 1%) resistor.
Note 5-16 Of
fset from 16nS pulse width at 50% of pulse peak.