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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 (CON), as well as low resistance (RON), 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 spacesaving TQFN packages and operate over the standard -40C to +85C 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 (RON): 4 (typ), 6.5 (max) o Ultra-Low On-Capacitance (CON): 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 450A (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+ PINPACKAGE 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 -40C to +85C 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
*EP
SEL 2B1 3B1 2B2 3B2 4B1 5B1 4B2 5B2
CH2: 4B2, 100mV/div
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 (TA = +70C) 32-Pin TQFN (derate 34.5mW/C above +70C) ........ 2.76W 36-Pin TQFN (derate 35.7mW/C above +70C) ........ 2.85W ESD Protection, Human Body Model .............................15kV Operating Temperature Range ...................... -40C to +85C Junction Temperature............................................ +150C Storage Temperature Range ....................... -65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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, TA = TJ = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25C.) (Note 1)
PARAMETER ANALOG SWITCH On-Resistance RON V+ = 3V, IA_ = -40mA, VA_ = 0, 1.5V, 3V TA = +25C TMIN to TMAX 4 5.5 6.5 40 0.5 1.5 TMIN to TMAX 0.01 -1 -1 +1 A On-Leakage Current ESD PROTECTION ESD Protection SWITCH AC PERFORMANCE Insertion Loss Return Loss ILOS RLOS RS = RL = 50, unbalanced, f = 1MHz, (Note 2) f = 100MHz 0.6 -23 dB dB Human Body Model (spec MIL-STD-883, Method 3015) 15 kV ILA_(ON) V+ = 3.6V, VA_= 0.3V, 3.3V; V_B1 or V_B2 = 0.3V, 3.3V or floating +1 2 SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance LED Switches
RONLED
V+ = 3V, I_LED_ = -40mA, VLED_ = 0, 1.5V, 3V (MAX4892E) V+ = 3V, IA_= -40mA, VA_ = 0, 1.5V, 3V (Note 2) TA = +25C
On-Resistance Match Between Channels On-Resistance Flatness Off-Leakage Current
RON
RFLAT(ON) ILA_(OFF)
V+ = 3V, IA_ = -40mA, VA_ = 1.5V, 3V V+ = 3.6V, VA_ = 0.3V, 3.3V; V_B1 or V_B2 = 3.3V, 0.3V
2
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1000 Base-T 15kV ESD Protection LAN Switch
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +3V to +3.6V, TA = TJ = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25C.) (Note 1)
PARAMETER SYMBOL VCT1 Crosstalk VCT2 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 VIL VIH VHYST ISEL V+ I+ V+ = 3.6V, VSEL = 0 or V+ V+ = 3.0V V+ = 3.6V V+ = 3.3V V+ = 3.6V, VSEL = 0 or V+ -5 3.0 280 2.0 100 +5 3.6 450 0.8 V mV A V A BW COFF CON tON tOFF tPLH, tPHL tSK(o) RS = RL = 50, unbalanced f = 1MHz, _B_, A_ f = 1MHz, _B_, A_ VA_ = 1V, RL, 100, Figure 2 VA_ = 1V, RL, 100, Figure 2 RS = RL = 50, 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; RS = RL = 50, unbalanced, Figure 1 f = 25MHz f = 125MHz MIN TYP -50 dB -26 MAX UNITS
MAX4890E/MAX4892E
Note 1: Specifications at -40C are guaranteed by design. Note 2: Guaranteed by design.
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3
1000 Base-T, 15kV ESD Protection LAN Switches MAX4890E/MAX4892E
Typical Operating Characteristics
(V+ = 3.3V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VA_
MAX4890E toc01
LED_ON-RESISTANCE vs. VLED_
MAX4890E toc02
LEAKAGE CURRENT vs. TEMPERATURE
36 32 LEAKAGE CURRENT (pA) 28 24 20 16 12 8 4 0 ILA_(OFF) ILA_(ON)
MAX4890E toc03
6 5 4
24 22 20 18 16 RONLED () TA = +85C
40
RON ()
3 2 1 0 0
TA = +85C TA = +25C TA = -40C
14 12 10 8 6 4 2 0 TA = -40C
TA = +25C
0.5
1.0
1.5 VA_ (V)
2.0
2.5
3.0
0
0.5
1.0
1.5 VLED_ (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 (A) 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
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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 0.1F 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
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5
1000 Base-T, 15kV ESD Protection LAN Switches MAX4890E/MAX4892E
MAX4892E
SINGLE-ENDED BANDWIDTH NETWORK ANALYZER 50 TRACE 36 TQFN 0B1 31
A0 36
50 TRACE
NETWORK ANALYZER
SINGLE-ENDED CROSSTALK NETWORK ANALYZER 50 TRACE
A2 2
2B1 26 R13 49.9 3B1 25 R14 49.9 4B1 22
NETWORK ANALYZER
50 TRACE
A3 3
SINGLE-ENDED OFF-ISOLATION NETWORK ANALYZER 50 TRACE R15 49.9
A4 7
50 TRACE
NETWORK ANALYZER
Figure 1. Single-Ended Bandwidth, Crosstalk, and Off-Isolation
Detailed Description
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 unterminated 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,
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 architecture 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 RON throughout the input signal range. An internal bandgap reference set to 1.23V and an internal oscillator running at 2.5MHz provide proper charge-pump operation. Unlike other charge-pump circuits, the MAX4890E/MAX4892E include internal flyback capacitors, reducing design time, board space, and cost.
6
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1000 Base-T, 15kV ESD Protection LAN Switches
Table 1. Truth Table
SEL 0 1 CONNECTION A_ to _B1, LED_ to _LED1 A_ to _B2, LED_ to _LED2
Applications Information
Typical Operating Circuit
The Typical Operating Circuit shows the MAX4890E/ MAX4892E in a 1000 Base-T docking station application.
MAX4890E/MAX4892E
Digital Control Inputs
The MAX4890E/MAX4892E provide a single digital control SEL. SEL controls the switches as well as the LED switches as shown in Table 1.
Power-Supply Sequencing and Overvoltage Protection
Caution: Do not exceed the absolute maximum ratings. Stresses beyond the listed ratings may cause permanent damage to the device. Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+ before applying analog signals, especially if the analog signal is not current limited.
Analog Signal Levels
The on-resistance of the MAX4890E/MAX4892E is very low and stable as the analog input signals are swept from ground to V+ (see the Typical Operating Characteristics). The switches are bidirectional, allowing A_ and _B_ to be configured as either inputs or outputs.
Layout
High-speed switches require proper layout and design procedures for optimum performance. Keep design-controlled-impedance pc board traces as short as possible. Ensure that bypass capacitors are as close as possible to the device. Use large ground planes where possible.
ESD Protection
The MAX4890E/MAX4892E are characterized using the Human Body Model for 15kV of ESD protection. Figure 5 shows the Human Body Model. This model consists of a 100pF capacitor charged to the ESD voltage of interest which is then discharged into the test device through a 1.5k resistor. All signal and control pins are ESD protected to 15kV HBM (Human Body Model).
Chip Information
PROCESS: BiCMOS
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7
1000 Base-T, 15kV ESD Protection LAN Switches MAX4890E/MAX4892E
SEL
VIH 3.0V 50% 50% VIL 2.0V A_ 1.0V
tON 50% 50% tOFF
_B1 tPLH tPHL
0V tOFF 50% tON _B2 50% PULSE SKEW = tSK(p) = |tPHL - tPLH| THE MAX4890E/MAX4892E SWITCHES ARE FULLY BIDIRECTIONAL. 0V _B_
VH 2.0V VL
Figure 2. Turn-On and Turn-Off Times
Figure 3. Propagation Delay Times
3.0V 2.0V A_ 1.0V tPLHX tPHLX
RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST
VOH 2.0V _B_ VOL tPHLY VOH 2.0V _B_ VOL
Cs 100pF
STORAGE CAPACITOR
tPLHY
OUTPUT SKEW = tSK(O) = |tPLHY - tPLHX| OR |tPHLY - tPHLX| THE MAX4890E/MAX4892E SWITCHES ARE FULLY BIDIRECTIONAL.
Figure 4. Output Skew
Figure 5. Human Body ESD Test Model (MIL-STD-883, Method 3015)
8
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1000 Base-T, 15kV ESD Protection LAN Switches
Typical Operating Circuit
DOCKING STATION
MAX4890E/MAX4892E
TRANSFORMER
RJ-45
LED
CONNECTOR NOTEBOOK
0B2 1B2 2B2 3B2 TRD0_P TRD0_N A0 A1 4B2 5B2 6B2 7B2 _LED2
TRD1_P TRD1_N ETHERNET PHY/MAC TRD2_P TRD2_N
A2 A3
MAX4892E
A4 A5 0B1 1B1
TRANSFORMER
TRD3_P TRD3_N
A6 A7
2B1 3B1 4B1 5B1 6B1 7B1
RJ-45
LED_OUT
LED_
SEL
SEL_DOCK
_LED1
LED
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9
1000 Base-T, 15kV ESD Protection LAN Switches MAX4890E/MAX4892E
Functional Diagrams
A0 A1
0B1 1B1 0B2 1B2
A0 A1
0B1 1B1 0B2 1B2
A2 A3
2B1 3B1 2B2 3B2
A2 A3
2B1 3B1 2B2 3B2
A4 A5
4B1 5B1 4B2 5B2
A4 A5
4B1 5B1 4B2 5B2
A6 A7
6B1 7B1 6B2 7B2
A6 A7
6B1 7B1 6B2 7B2
LED0 SEL MAX4890E LED1 LED2
0LED1 0LED2 1LED1 1LED2 2LED1 2LED2
SEL MAX4892E
10
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1000 Base-T, 15kV ESD Protection LAN Switches MAX4890E/MAX4892E
Pin Configurations (continued)
TOP VIEW
1B1 SEL 0B1 0B2 1B2 A0 A1 V+
32
31
30
29
28
27
26
25 24 23 22 21
2B1 3B1 2B2 3B2 4B1 5B1 4B2 5B2
+
A2 A3 N.C. N.C. N.C. N.C. A4 A5
1 2 3 4 5 6 7 8 9
A6
*EP
MAX4890E
20 19 18 17
10
A7
11
GND
12
N.C.
13
7B2
14
6B2
15
7B1
16
6B1
TQFN
*EXPOSED PADDLE CONNECTED TO GND.
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11
1000 Base-T, 15kV ESD Protection LAN Switches MAX4890E/MAX4892E
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
QFN THIN.EPS
12
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1000 Base-T, 15kV ESD Protection LAN Switches
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
QFN THIN.EPS
MAX4890E/MAX4892E
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 (c) 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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