MAX4892EETX+ Maxim Integrated Products, MAX4892EETX+ Datasheet - Page 6

• Manufacturer Part Number: MAX4892EETX+
• Description: IC ETHERNET SWITCH OCTAL 36TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX4892EETX+

• Function: Ethernet Switch
• Circuit: 8 x 2:1
• On-state Resistance: 5.5 Ohm
• Voltage Supply Source: Single Supply
• Voltage - Supply, Single/dual (±): 3 V ~ 3.6 V
• Current - Supply: 280µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX4890E/MAX4892E are high-speed analog
switches targeted for 1000 Base-T applications. In a
typical application, the MAX4890E/MAX4892E switch
the signals from two separate interface transformers
and connect the signals to a single 1000 Base-T
Ethernet PHY (see the Typical Operating Circuit). This
configuration simplifies docking station design by
avoiding signal reflections associated with unterminat-
ed transmission lines in a T configuration. The
MAX4890E/MAX4892E are protected against ±15kV
electrostatic discharge (ESD) shocks. The MAX4892E
also includes LED switches that allow the LED output
signals to be routed to a docking station along with the
Ethernet signals. See the Functional Diagrams.
With their low resistance and capacitance, as well as
high ESD protection, the MAX4890E/MAX4892E can be
used to switch most low-voltage differential signals,
1000 Base-T, ±15kV ESD Protection LAN Switches
Figure 1. Single-Ended Bandwidth, Crosstalk, and Off-Isolation
6
_______________________________________________________________________________________
Detailed Description
NETWORK
ANALYZER
ANALYZER
NETWORK
ANALYZER
ANALYZER
NETWORK
NETWORK
SINGLE-ENDED BANDWIDTH
SINGLE-ENDED CROSSTALK
SINGLE-ENDED OFF-ISOLATION
50Ω TRACE
50Ω TRACE
50Ω TRACE
49.9Ω
50Ω TRACE
R15
A0
36
A3
3
A2
2
A4
7
MAX4892E
36 TQFN
0B1
31
4B1
22
2B1
26
3B1
25
such as LVDS, SEREDES, and LVPECL, as long as the
signals do not exceed maximum ratings of the devices.
The MAX4890E/MAX4892E switches provide an
extremely low capacitance and on-resistance to meet
Ethernet insertion and return-loss specifications. The
MAX4892E features three built-in LED switches.
The MAX4890E/MAX4892E incorporate a unique archi-
tecture design utilizing only n-channel switches within
the main Ethernet switch, reducing I/O capacitance and
channel resistance. An internal two-stage charge pump
with a nominal output of 7.5V provides the high voltage
needed to drive the gates of the n-channel switches
while maintaining a consistently low R
input signal range. An internal bandgap reference set to
1.23V and an internal oscillator running at 2.5MHz pro-
vide proper charge-pump operation. Unlike other
charge-pump circuits, the MAX4890E/MAX4892E
include internal flyback capacitors, reducing design
time, board space, and cost.
49.9Ω
49.9Ω
R14
R13
50Ω TRACE
50Ω TRACE
ANALYZER
NETWORK
ANALYZER
NETWORK
ON
throughout the