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MAX4891ETJ+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
General Description
The MAX4890/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 (R
ON
): 4Ω (typ), 6.5Ω (max)
♦ Ultra-Low On-Capacitance (C
ON
): 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
MAX4890/MAX4891/MAX4892
10/100/1000 Base-T Ethernet LAN Switch
________________________________________________________________
Maxim Integrated Products
1
32 31 30 29 28 27 26
9 101112131415
18
19
20
21
22
23
24
7
6
5
4
3
2
1
MAX4890
TQFN
TOP VIEW
A3
A2
N.C.
N.C.
N.C.
N.C.
A4
8
A5
A
1
A
0
V
+
S
E
L
0
B
1
1
B
1
0
B
2
25
1
B
2
2B1
3B1
2B2
3B2
4B1
5B1
4B2
17
5B2
*EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED
7
B
1
6
B
2
16
6
B
1
7
B
2
N
.
C
.
G
N
D
A
7
A
6
*EP
Pin Configurations
Ordering Information
19-3577; Rev 2; 8/07
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.
PART PIN-PACKAGE
LED SWITCHES
MAX4890ETJ 32 TQFN-EP* —
MAX4891ETJ 32 TQFN-EP* 1
MAX4892ETX 36 TQFN-EP* 3
Note: All devices are specified for operation in the -40°C to
+85°C temperature range.
*
EP = Exposed pad.
Functional Diagrams and Typical Operating Circuit appear
at end of data sheet.
Pin Configurations continued at end of data sheet.
MAX4890/MAX4891/MAX4892
10/100/1000 Base-T Ethernet LAN Switch
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V+ .............................................................................-0.3V to +4V
SEL (Note 1) ..................................................-0.3V to (V+ +0.3V)
A_, _B_, LED_, _LED_ ...................................-0.3V to (V+ +0.3V)
Continuous Current (A_ to _B_) ......................................±120mA
Continuous Current (LED_ to _LED_) ...............................±30mA
Peak Current (A_ to _B_)
(pulsed at 1ms, 10% duty cycle)................................±240mA
Continuous Power Dissipation (T
A
= +70°C)
32-Pin TQFN (derate 34.5mW/°C above +70°C) ...........2.76W
36-Pin TQFN (derate 26.3mW/°C above +70°C) ...........2.11W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V+ = +3V to +3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
ANALOG SWITCH
T
A
= +25°C 4 5.5
On-Resistance R
ON
V+ = 3V,
I
A_
= -40mA,
1.5V ≤ V
A_
≤ V+
T
MIN
to T
MAX
6.5
Ω
On-Resistance
LED Switches
R
ONLED
V+ = 3V, I
_LED_
= -40mA, 1.5V ≤ V
A_
≤ V+,
MAX4891/MAX4892
40 Ω
T
A
= +25°C 0.5 1.5
On-Resistance Match
Between Channels
ΔR
ON
V+ = 3V,
I
A_
= -40mA,
1.5V ≤ V
A_
≤ V+
(Note 3)
T
MIN
to T
MAX
2
Ω
On-Resistance Flatness
R
FLAT
(
ON
)
V+ = 3V, I
A_
= -40mA, V
A_
= 1.5V, 2.7V
0.01
Ω
Off-Leakage Current
I
LA_
(
OFF
)
V+ = 3.6V, V
A_
= 0.3V, 3.3V
V
_B1
or V
_B2
= 3.3V, 0.3V
-1 +1
On-Leakage Current
I
LA_
(
ON
)
V+ = 3.6V, V
A_
= 0.3V, 3.3V
V
_B1
or V
_B2
= 0.3V, 3.3V or floating
-1 +1
µA
ESD PROTECTION
ESD Protection Human Body Model ±2 kV
SWITCH AC PERFORMANCE
Insertion Loss I
LOS
Insertion loss with typical transformer,
R
L
= 100Ω, 1MHz < f < 100MHz, Figure 1
(Note 3)
0.6 dB
R
LOS1
1MHz < f < 40MHz
-19
Return Loss
R
LOS2
Return loss with
typical transformer,
R
L
= 100Ω, return
loss, f in MHz,
Figure 2 (Note 3)
40MHz < f < 100MHz
-13
+20log
(f/80)
dB
Note 1: Signals on SEL, exceeding V+ or GND, are clamped by internal diodes. Limit forward-diode current to maximum current
rating.
MAX4890/MAX4891/MAX4892
10/100/1000 Base-T Ethernet LAN Switch
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +3V to +3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
V
CT1
1MHz < f < 30MHz -45
V
CT2
30MHz < f < 60MHz -40Crosstalk
V
CT3
Any switch to any
switch R
L
= 100Ω,
Figure 3
60MHz < f < 100MHz
-35
dB
V
DCT1
1MHz < f < 30MHz -60
V
DCT2
30MHz < f < 60MHz -55
Differential Crosstalk
V
DCT3
R
L
= 100Ω,
Figure 4
60MHz < f < 100MHz
-50
dB
SWITCH DYNAMICS
On-Channel -3dB Bandwidth BW R
L
= 100Ω, Differential pair
1000 MHz
Off-Capacitance C
OFF
f = 1MHz, _B_ inputs 3.5 pF
On-Capacitance C
ON
f = 1MHz, _B_ inputs 6.5 pF
Off-Capacitance, LED Switches
C
OFFLED
f = 1MHz, _LED inputs 20 pF
On-Capacitance, LED Switches
C
ONLED
f = 1MHz, _LED inputs 22 pF
Turn-On Time t
ON
V
A_
= 1V, Figure 5 25 50 ns
Turn-Off Time t
OFF
V
A_
= 1V, Figure 5 20 40 ns
Propagation Delay
t
PLH
,
t
PHL
C
L
= 10pF, Figure 6
0.15
ns
Output Skew Between Ports t
SK(o)
Skew between A4 and A5 and any other
port, Figure 7
0.01
ns
Output Skew Same Port t
SK(p)
Skew between opposite transitions in same
port
0.07
ns
SWITCH LOGIC
Input-Voltage Low V
IL
0.8
Input-Voltage High V
IH
2.0
V
Input-Logic Hysteresis V
HYST
100
mV
Input Leakage Current I
SEL
V+ = 3.6V, V
SEL
= 0 or V+ -5 +5 uA
Operating Supply-Voltage Range
V+ 3 3.6 V
Quiescent Supply Current I+ V+ = 3.6V, V
SEL
= 0 or V+
280 450
µA
Note 2: Specifications at -40°C are guaranteed by design.
Note 3: Guaranteed by design.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX4891ETJ+

Mfr. #:
Buy MAX4891ETJ+
Manufacturer:
Maxim Integrated
Description:
Analog Switch ICs 10/100/1000 Base-T Ethernet LAN Switch
Lifecycle:
New from this manufacturer.
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