19-0624; Rev 0; 8/06
1000 Base-T, ±15kV ESD Protection LAN Switches
General Description
The MAX4890E/MAX4892E meet the needs of high-speed
differential switching. The devices handle the needs of
Gigabit Ethernet (10/100/1000) Base-T switching as
well as LVDS and LVPECL switching. The MAX4890E/
MAX4892E provide enhanced ESD protection up to
±15kV, and excellent high-frequency response, making
the devices especially useful for interfaces that must go to
an outside connection.
Both devices provide extremely low capacitance
(C
ON
), as well as low resistance (R
ON
), for low-insertion
loss and very wide bandwidth. In addition to the four
pairs of DPDT switches, the MAX4892E provides LED
switching for laptop computer/docking station use.
The MAX4890E/MAX4892E are pin-for-pin equivalents
to the MAX4890/MAX4892 and can replace these
devices for those applications requiring the enhanced
ESD protection. Both devices are available in space-
saving TQFN packages and operate over the standard
-40°C to +85°C temperature range.
Features
o
±15kV ESD Protected Per MIL-STD-883, Method
3015
o
Single +3.0V to +3.6V Power-Supply Voltage
o
Low On-Resistance (R
ON
): 4Ω (typ), 6.5Ω (max)
o
Ultra-Low On-Capacitance (C
ON
): 8pF (typ)
o
-23dB Return Loss (100MHz)
o
-3dB Bandwidth: 650MHz
o
Optimized Pin Out for Easy Transformer and PHY
Interface
o
Built-In LED Switches for Switching Indicators to
Docking Station (MAX4892E)
o
Low 450µA (max) Quiescent Current
o
Bidirectional 8 to 16 Multiplexer/Demultiplexer
o
Standard Pin Out, Matching the MAX4890 and
MAX4892
o
Space-Saving Lead-Free Packages
32-Pin, 5mm x 5mm, TQFN Package
36-Pin, 6mm x 6mm, TQFN Package
MAX4890E/MAX4892E
Applications
Notebooks and Docking Stations
Servers and Routers with Ethernet Interfaces
Board-Level Redundancy Protection
SONET/SDH Signal Routing
T3/E3 Redundancy Protection
LVDS and LVPECL Switching
Ordering Information
PART
MAX4890EETJ+
MAX4892EETX+
PIN-
PACKAGE
32 TQFN-EP*
36 TQFN-EP*
LED
SWITCHES
—
3
PKG
CODE
T-3255-4
T-3666-3
Pin Configurations
1B1
0B2
0B1
A0
1B2
TOP VIEW
36
V+
LED2
2LED1
2LED2
+Denotes
lead-free package.
Note:
All devices are specified over the -40°C to +85°C operating
temperature range.
*EP
= Exposed pad.
35
34
33
32
31
30
29
28
Eye Diagram
27
26
25
24
23
22
21
20
19
+
A1
A2
A3
LED0
0LED1
0LED2
A4
A5
A6
1
2
3
4
5
6
7
8
9
MAX4892E
SEL
2B1
3B1
2B2
3B2
4B1
5B1
4B2
5B2
CH2: 4B2, 100mV/div
*EP
10
11
12
13
14
15
16
17
GND
LED1
1LED1
1LED2
7B2
6B2
7B1
A7
6B1
18
CH1: 5B2, 100mV/div
f = 125MHz
TQFN
*EXPOSED PAD CONNECTED TO GND.
Pin Configurations continued at end of data sheet.
Typical Operating Circuit and Functional Diagrams appear
at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
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.
1000 Base-T, ±15kV ESD Protection LAN Switches
MAX4890E/MAX4892E
ABSOLUTE MAXIMUM RATINGS
V+ ……………………………………………………… -0.3V to +4V
All Other Pins………………………………….. -0.3V to (V+ + 0.3V)
Continuous Current (A_ to _B_) ......................................±120mA
Continuous Current (LED_ to _LED_) .…………………… ±40mA
Peak Current (A_ to _B_)
(pulsed at 1ms, 10% duty cycle) ……………………. ±240mA
Current into Any Other Pin................................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
32-Pin TQFN (derate 34.5mW/°C above +70°C) …….. 2.76W
36-Pin TQFN (derate 35.7mW/°C above +70°C) …….. 2.85W
ESD Protection, Human Body Model .............................±15kV
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
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.
ELECTRICAL CHARACTERISTICS
(V+ = +3V to +3.6V, T
A
= T
J
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
ANALOG SWITCH
On-Resistance
R
ON
V+ = 3V,
I
A_
= -40mA,
V
A_
= 0, 1.5V, 3V
T
A
= +25°C
T
MIN
to T
MAX
4
5.5
Ω
6.5
40
0.5
1.5
Ω
T
MIN
to T
MAX
0.01
-1
-1
+1
µA
On-Leakage Current
ESD PROTECTION
ESD Protection
SWITCH AC PERFORMANCE
Insertion Loss
Return Loss
I
LOS
R
LOS
R
S
= R
L
= 50Ω, unbalanced, f = 1MHz,
(Note 2)
f = 100MHz
0.6
-23
dB
dB
Human Body Model (spec MIL-STD-883,
Method 3015)
±15
kV
I
LA_(ON)
V+ = 3.6V, V
A_
= 0.3V, 3.3V;
V
_B1
or V
_B2
= 0.3V, 3.3V or floating
+1
2
Ω
Ω
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
On-Resistance LED Switches
R
ONLED
V+ = 3V, I
_LED_
= -40mA, V
LED_
= 0, 1.5V, 3V
(MAX4892E)
V+ = 3V,
I
A_
= -40mA,
V
A_
= 0, 1.5V, 3V
(Note 2)
T
A
= +25°C
On-Resistance Match
Between Channels
On-Resistance Flatness
Off-Leakage Current
∆R
ON
R
FLAT(ON)
I
LA_(OFF)
V+ = 3V, I
A_
= -40mA, V
A_
= 1.5V, 3V
V+ = 3.6V, V
A_
= 0.3V, 3.3V;
V
_B1
or V
_B2
= 3.3V, 0.3V
2
_______________________________________________________________________________________
1000 Base-T ±15kV ESD Protection LAN Switch
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +3V to +3.6V, T
A
= T
J
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
V
CT1
Crosstalk
V
CT2
SWITCH AC CHARACTERISTIC
-3dB Bandwidth
Off-Capacitance
On-Capacitance
Turn-On Time
Turn-Off Time
Propagation Delay
Output Skew Between Ports
SWITCH LOGIC
Input-Voltage Low
Input-Voltage High
Input-Logic Hysteresis
Input Leakage Current
Operating Supply-Voltage Range
Quiescent Supply Current
V
IL
V
IH
V
HYST
I
SEL
V+
I+
V+ = 3.6V, V
SEL
= 0 or V+
V+ = 3.0V
V+ = 3.6V
V+ = 3.3V
V+ = 3.6V, V
SEL
= 0 or V+
-5
3.0
280
2.0
100
+5
3.6
450
0.8
V
mV
µA
V
µA
BW
C
OFF
C
ON
t
ON
t
OFF
t
PLH,
t
PHL
t
SK(o)
R
S
= R
L
= 50Ω, unbalanced
f = 1MHz,
_B_,
A_
f = 1MHz,
_B_,
A_
V
A_
= 1V, R
L
, 100Ω, Figure 2
V
A_
= 1V, R
L
, 100Ω, Figure 2
R
S
= R
L
= 50Ω, unbalanced, Figure 3
Skew between any two ports, Figure 4
0.1
0.01
650
3.5
6.5
50
50
MHz
pF
pF
ns
ns
ns
ns
CONDITIONS
Any switch to any
switch; R
S
= R
L
=
50Ω, unbalanced,
Figure 1
f = 25MHz
f = 125MHz
MIN
TYP
-50
dB
-26
MAX
UNITS
MAX4890E/MAX4892E
Note 1:
Specifications at -40°C are guaranteed by design.
Note 2:
Guaranteed by design.
_______________________________________________________________________________________
3
1000 Base-T, ±15kV ESD Protection LAN Switches
MAX4890E/MAX4892E
Typical Operating Characteristics
(V+ = 3.3V, T
A
= +25°C, unless otherwise noted.)
ON-RESISTANCE vs. V
A_
MAX4890E toc01
LED_ON-RESISTANCE vs. V
LED_
MAX4890E toc02
LEAKAGE CURRENT vs. TEMPERATURE
36
32
LEAKAGE CURRENT (pA)
28
24
20
16
12
8
4
0
IL
A_
(OFF)
IL
A_
(ON)
MAX4890E toc03
6
5
4
24
22
20
18
16
R
ONLED
(Ω)
T
A
= +85°C
40
R
ON
(Ω)
3
2
1
0
0
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
14
12
10
8
6
4
2
0
T
A
= -40°C
T
A
= +25°C
0.5
1.0
1.5
VA_ (V)
2.0
2.5
3.0
0
0.5
1.0
1.5
V
LED_
(V)
2.0
2.5
3.0
-40
-15
10
35
60
85
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX4890E toc04
SINGLE-ENDED INSERTION LOSS
vs. FREQUENCY
-1
INSERTION LOSS (dB)
-2
-3
-4
-5
-6
-7
-8
MAX4890E toc05
0
340
QUIESCENT SUPPLY CURRENT (µA)
320
300
280
260
240
220
200
-40
-15
10
35
V+ = 3.6V
60
85
1
10
100
1000
TEMPERATURE (°C)
FREQUENCY (MHz)
4
_______________________________________________________________________________________
1000 Base-T ±15kV ESD Protection LAN Switch
Pin Description
PIN
MAX4892E
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
—
—
MAX4890E
32
1
2
—
—
—
7
8
9
10
11
—
—
—
13
14
15
16
17
18
19
20
21
22
23
24
29
25
26
27
28
—
—
—
30
31
3-6, 12
—
NAME
A1
A2
A3
LED0
0LED1
0LED2
A4
A5
A6
A7
GND
LED1
1LED1
1LED2
7B2
6B2
7B1
6B1
5B2
4B2
5B1
4B1
3B2
2B2
3B1
2B1
SEL
1B2
0B2
1B1
0B1
2LED2
2LED1
LED2
V+
A0
N.C.
EP
FUNCTION
Differential PHY Interface Pair. Connect to the Ethernet PHY.
Differential PHY Interface Pair. Connect to the Ethernet PHY.
Differential PHY Interface Pair. Connect to the Ethernet PHY.
LED0 Input
0LED1 Output. Drive SEL low (SEL = 0) to connect LED0 to 0LED1.
0LED2 Output. Drive SEL high (SEL = 1) to connect LED0 to 0LED2.
Differential PHY Interface Pair. Connect to the Ethernet PHY.
Differential PHY Interface Pair. Connect to the Ethernet PHY.
Differential PHY Interface Pair. Connect to the Ethernet PHY.
Differential PHY Interface Pair. Connect to the Ethernet PHY.
Ground
LED1 Input
1LED1 Output. Drive SEL low (SEL = 0) to connect LED1 to 1LED1.
1LED2 Output. Drive SEL high (SEL = 1) to connect LED1 to 1LED2.
B2 Differential Pair
B2 Differential Pair
B1 Differential Pair
B1 Differential Pair
B2 Differential Pair
B2 Differential Pair
B1 Differential Pair
B1 Differential Pair
B2 Differential Pair
B2 Differential Pair
B1 Differential Pair
B1 Differential Pair
Select Input. SEL selects switch connection. See the Truth Table (Table1).
B2 Differential Pair
B2 Differential Pair
B1 Differential Pair
B1 Differential Pair
2LED2 Output. Drive SEL high (SEL = 1) to connect LED2 to 2LED2.
2LED1 Output. Drive SEL low (SEL = 0) to connect LED2 to 2LED1.
LED2 Input
Positive-Supply Voltage Input. Bypass to GND with a 0.1µF ceramic capacitor.
Differential PHY Interface Pair. Connect to the Ethernet PHY.
No Connection. Not internally connected.
Exposed Pad. Connect exposed pad to GND or leave it unconnected.
MAX4890E/MAX4892E
_______________________________________________________________________________________
5
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