参数资料
型号: WBLXT974BHCA8
厂商: CORTINA SYSTEMS INC
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP160
封装: ROHS COMPLIANT, PLASTIC, MS-002DD-1, HQFP-160
文件页数: 47/76页
文件大小: 1004K
代理商: WBLXT974BHCA8
Fast Ethernet 10/100 Quad Transceivers — LXT974/LXT975
Datasheet
51
Table 25. Digital I/O Characteristics - MII Pins)
Parameter
Symbol
Min
Typ
Max
Units
Test Conditions
Input Low voltage
VIL
––.8
V
Input High voltage
VIH
2.0
V
Input current
II
-100
100
μA0.0 < VI < VCC
Output Low voltage
VOL
––
0.4
V
IOL = 4 mA
Output High voltage
VOH
2.2
V
IOH = -4 mA, VCC = 3.3V
VOH
2.4
V
IOH = -4 mA, VCC = 5.0V
Driver output resistance
(Line driver output enabled)
RO
1
50
100
200
Ω
VCC = 3.3V
RO1
50
100
200
Ω
VCC = 5.0V
1. Parameter is guaranteed by design; not subject to production testing.
Table 26. Required CLK25M Characteristics
Parameter
Sym
Min
Typ
Max
Units
Test Conditions
Input Low voltage
VIL
––.8
V
Input High voltage
VIH
2.0
V
Input clock frequency tolerance1
Δf
± 100
ppm
Clock frequency is 25 MHz
Input clock duty cycle
1
Tdc
40
60
%
1. Parameter is guaranteed by design; not subject to production testing.
Table 27. Low-Voltage Fault Detect Characteristics
Parameter
Sym
Min
Typ
1
Max
Units
Test Conditions
Detect fault threshold
VLT
3.4–4.0
V
Clear fault threshold
VLH
4.1–4.7
V
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
Table 28. 100BASE-TX Transceiver Characteristics
Parameter
Sym
Min
Typ
1
Max
Units
Test Conditions
Peak differential output voltage
VP
0.95
1.05
V
Note 2
Signal amplitude symmetry
Vss
98
102
%
Note 2
Signal rise/fall time
TRF
3.0
5.0
ns
Note 2
Rise/fall time symmetry
TRFS
0.5
ns
Note 2
Jitter (measured differentially)
0.7
1.4
ns
Duty cycle distortion
+/- 0.5
ns
Offset from 16ns pulse width at
50% of pulse peak
Overshoot
VO
––
5
%
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
2. Measured at the line side of the transformer, line replaced by 100
Ω(+/-1%) resistor.
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