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PDF MAX4890 Data sheet ( Hoja de datos )
| Número de pieza | MAX4890 | |
| Descripción | (MAX4890 - MAX48920 10/100/1000 Base-T Ethernet LAN Switch | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX4890 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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19-3577; Rev 1; 8/05
10/100/1000 Base-T Ethernet LAN Switch
General Description
www.dTathaeshMeeAt4Xu4.c8o9m0/MAX4891/MAX4892 high-speed analog
switches meet the needs of 10/100/1000 Base-T appli-
cations. These devices switch the signals from two
interface transformers and connect the signals to a sin-
gle 10/100/1000 Base-T Ethernet PHY, simplifying
docking station design and reducing manufacturing
costs. The MAX4890/MAX4891/MAX4892 can also
route signals from a common interface transformer to
two different boards in board-redundancy applications.
The MAX4890/MAX4891/MAX4892 switches provide an
extremely low capacitance and on-resistance to meet
Ethernet insertion and return-loss specifications. The
MAX4891/MAX4892 feature one and three built-in LED
switches, respectively.
The MAX4890/MAX4891/MAX4892 are available in
space-saving 32- and 36-lead TQFN packages,
significantly reducing the required PC board area.
These devices operate over the -40°C to +85°C tem-
perature range.
Applications
Notebooks and Docking Stations
Servers and Routers with Ethernet Interfaces
Board-Level Redundancy Protection
SONET/SDH Signal Routing
T3/E3 Redundancy Protection
Video Switching
Features
♦ Single +3.0V to +3.6V Power-Supply Voltage
♦ Low On-Resistance (RON): 4Ω (typ), 6.5Ω (max)
♦ Ultra-Low On-Capacitance (CON): 6.5pF (typ)
♦ Low < 200ps Bit-to-Bit Skew
♦ -3dB Bandwidth: 1GHz
♦ Optimized Pin-Out for Easy Transformer and PHY
Interface
♦ Built-In LED Switches for Switching Indicators to
Docking Station
♦ Low 450µA (max) Quiescent Current
♦ Bidirectional 8 to 16 Multiplexer/Demultiplexer
♦ Space-Saving Packages
32-Pin, 5mm x 5mm, TQFN Package
36-Pin, 6mm x 6mm, TQFN Package
Ordering Information
PART
PIN-
PACKAGE
LED
SWITCHES
PKG
CODE
MAX4890ETJ
MAX4891ETJ
32 TQFN
32 TQFN
— T-3255-4
1 T-3255-4
MAX4892ETX
36 TQFN
3 T-3666-3
All devices are available in the -40°C to +85°C operation tem-
perature range.
Pin Configurations
Typical Operating Circuit appears at end of data sheet.
TOP VIEW
32 31 30 29 28 27 26 25
A2 1
A3 2
N.C. 3
N.C. 4
N.C. 5
N.C. 6
A4 7
A5 8
MAX4890*
24 2B1
23 3B1
22 2B2
21 3B2
20 4B1
19 5B1
18 4B2
17 5B2
9 10 11 12 13 14 15 16
TQFN
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
10/100/1000 Base-T Ethernet LAN Switch
Typical Operating Characteristics (continued)
w w(V+ =w3.3V, .TA = d+25°Ca, unletss othaerwisse notehd.) e e t 4 u . c o m
TURN-ON/-OFF TIME
vs. SUPPLY VOLTAGE
25
20
tON
15
tOFF
10
5
0
3.0
3.2 3.4
SUPPLY VOLTAGE (V)
3.6
RISE-/FALL-TIME PROPAGATION DELAY
vs. TEMPERATURE
250
tPLH
200
150
100
tPHL
50
-40
20
-15 10 35 60
TEMPERATURE (°C)
OUTPUT SKEW
vs. SUPPLY VOLTAGE
85
10 tSK(o)_FALL
0
tSK(o)_RISE
-10
-20
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
TURN-ON/-OFF TIME
vs. TEMPERATURE
30
tON
25
20
15
tOFF
10
5
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
RISE-/FALL-TIME PROPAGATION DELAY
vs. SUPPLY VOLTAGE
250
tPLH
200
150
100
50
3.0
tPHL
3.3
SUPPLY VOLTAGE (V)
3.6
PULSE SKEW vs. SUPPLY VOLTAGE
100
tSK(p)
80
60
40
20
0
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
OUTPUT SKEW vs. TEMPERATURE
20
tSK(o)_FALL
10
0
tSK(o)_RISE
-10
-20
-40
-15 10 35 60
TEMPERATURE (°C)
85
PULSE SKEW vs. TEMPERATURE
100
tSK(p)
80
60
40
20
0
-40 -15 10 35 60
TEMPERATURE (°C)
85
DIFFERENTIAL INSERTION LOSS
vs. FREQUENCY
1
0
-1
-2
-3
-4
-5
1 10 100
FREQUENCY (MHz)
_______________________________________________________________________________________ 5
5 Page 
10/100/1000 Base-T Ethernet LAN Switch
www.datasheet4u.com
SEL
1.25V
tON
90%
tOFF
10%
Figure 5. ENABLE and DISABLE Times
1.25V
2.5V
0V
A_
tOFF
90%
0V
tON
A_
90%
0V
3.0V
2.0V
A_
1.0V
tPLH tPHL
_B_
PULSE SKEW = tSK(p) = |tPHL - tPLH|
THE MAX4890/MAX4891/MAX4892 SWITCHES ARE FULLY BIDIRECTIONAL.
VOH
2.0V
VOL
Figure 6. Propagation Delay Times
A_
tPLHX
3.0V
2.0V
1.0V
tPHLX
_B_
tPLHY
_B_
PULSE SKEW = tSK(p) = |tPHLY - tPLHX| OR |tPHLy - tPHLx|
THE MAX4890/MAX4891/MAX4892 SWITCHES ARE FULLY BIDIRECTIONAL.
Figure 7. Output Skew
VOH
2.0V
VOL
tPHLY
VOH
2.0V
VOL
RC
1MΩ
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
RD
1500Ω
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Figure 8. Human Body ESD Test Model
DEVICE
UNDER
TEST
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX4890.PDF ] | |
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