LAN8740A Datasheet, PDF (116/136 Pages) Microchip Technology – Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

LAN8740A/LAN8740Ai
TABLE 5-5: VARIABLE I/O BUFFER CHARACTERISTICS
Parameter
VIS Type Input Buffer
Symbol
Min.
1.8 V
Typ.
2.5 V
Typ.
3.3 V
Typ.
Max.
Unit
Note
Low Input Level
High Input Level
Neg-Going Threshold
Pos-Going Threshold
Schmitt Trigger Hystere-
sis (V_IHT - V_ILT)
Input Leakage
(V_IN = VSS or VDDIO)
Input Capacitance
VO8 Type Buffers
V_ILI
V_IHI
V_ILT
V_IHT
V_HYS
I_IH
C_IN
-0.3
V
3.6
V
0.64
0.83 1.15 1.41 1.76
V Schmitt trigger
0.81
0.99 1.29 1.65 1.90
V Schmitt trigger
102
158 136 138 288
mV
-10
10
µA (see Note 1)
2
pF
Low Output Level
High Output Level
VOD8 Type Buffer
V_OL
V_OH
VDDIO - 0.4
0.4
V
I_OL = 8 mA
V I_OH = -8 mA
Low Output Level
V_OL
0.4
V
I_OL = 8 mA
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).
TABLE 5-6: 100BASE-TX TRANSCEIVER CHARACTERISTICS
Parameter
Peak Differential Output Voltage High
Peak Differential Output Voltage Low
Signal Amplitude Symmetry
Signal Rise and Fall Time
Rise and Fall Symmetry
Duty Cycle Distortion
Overshoot and Undershoot
Jitter
Symbol
V_PPH
V_PPL
V_SS
T_RF
T_RFS
D_CD
V_OS
Min.
950
-950
98
3.0
-
35
-
Typ.
-
-
-
-
-
50
-
Max.
1050
-1050
102
5.0
0.5
65
5
1.4
Note 1: Measured at line side of transformer, line replaced by 100 Ω (±1%) resistor.
2: Offset from 16 ns pulse width at 50% of pulse peak.
3: Measured differentially.
Unit
mVpk
mVpk
%
ns
ns
%
%
ns
Note
(see Note 1)
(see Note 1)
(see Note 1)
(see Note 1)
(see Note 1)
(see Note 2)
(see Note 3)
TABLE 5-7: 10BASE-T TRANSCEIVER CHARACTERISTICS
Parameter
Symbol Min.
Typ.
Transmitter Peak Differential Output Voltage
V_OUT
2.2
2.5
Receiver Differential Squelch Threshold
V_DS
300
420
Note 1: Min/max voltages guaranteed as measured with 100 Ω resistive load.
Max.
2.8
585
Unit
Note
V (see Note 1)
mV
DS00001987A-page 116
 2013-2015 Microchip Technology Inc.