MAXIM MAX4890E, MAX4892E User Manual

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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

-40°C to +85°C temperature range.

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

Features

♦ ±15kV ESD Protected Per MIL-STD-883, Method

3015

♦ Single +3.0V to +3.6V Power-Supply Voltage

♦ Low On-Resistance (RON): 4Ω (typ), 6.5Ω (max)

♦ Ultra-Low On-Capacitance (CON): 8pF (typ)

♦ -23dB Return Loss (100MHz)

♦ -3dB Bandwidth: 650MHz

♦ Optimized Pin Out for Easy Transformer and PHY

Interface

♦ Built-In LED Switches for Switching Indicators to

Docking Station (MAX4892E)

♦ Low 450µA (max) Quiescent Current

♦ Bidirectional 8 to 16 Multiplexer/Demultiplexer

♦ Standard Pin Out, Matching the MAX4890 and

MAX4892

♦ Space-Saving Lead-Free Packages

32-Pin, 5mm x 5mm, TQFN Package
36-Pin, 6mm x 6mm, TQFN Package

MAX4890E/MAX4892E

1000 Base-T, ±15kV ESD Protection LAN Switches

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-0624; Rev 0; 8/06

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

PIN­PACKAGE

LED

PKG

CODE

MAX4890EETJ+

—

T-3255-4

MAX4892EETX+

3

T-3666-3

+Denotes lead-free package.

Note: All devices are specified over the -40°C to +85°C operating
temperature range.
*EP = Exposed pad.

Typical Operating Circuit and Functional Diagrams appear
at end of data sheet.

Eye Diagram

CH2: 4B2, 100mV/div

CH1: 5B2, 100mV/div

f = 125MHz

Pin Configurations

SEL
2B1

2B2
3B2

4B2

5B2

4B1
5B1

3B1

A3

LED0

0LED1

A4
A5
A6

A1

1

2

3

4

5

6

7

8

9

101112131415161718

363534333231302928

27

26

25

24

23

22

21

20

19

1LED2

7B2

6B2

6B1

1LED1

LED1

GND

A7

MAX4892E

TOP VIEW

0LED2

7B1

A2

A0

0B2

V+

LED2

2LED1

2LED2

0B1

1B1

1B2

TQFN

*EP

*EXPOSED PAD CONNECTED TO GND.

+

Pin Configurations continued at end of data sheet.

SWITCHES

32 TQFN-EP*

36 TQFN-EP*

MAX4890E/MAX4892E

1000 Base-T, ±15kV ESD Protection LAN Switches

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
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

ELECTRICAL CHARACTERISTICS

(V+ = +3V to +3.6V, TA= TJ= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V+ = 3.3V, TA= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ANALOG SWITCH

TA = +25°C 4 5.5

On-Resistance R

ON

V+ = 3V,
I

A_

= -40mA,

V

A_

= 0, 1.5V, 3V

T

MIN

to T

MAX

6.5

Ω

On-Resistance LED Switches

(MAX4892E)

40 Ω

TA = +25°C 0.5 1.5

On-Resistance Match
Between Channels

∆R

ON

V+ = 3V,
I

A_

= -40mA,

V

A_

= 0, 1.5V, 3V

(Note 2)

T

MIN

to T

MAX

2

Ω

On-Resistance Flatness

)

V+ = 3V, IA_ = -40mA, V

A_

= 1.5V, 3V

Ω

Off-Leakage Current

)

V+ = 3.6V, VA_ = 0.3V, 3.3V;
V

_B1

or V

_B2

= 3.3V, 0.3V

-1 +1

On-Leakage Current

)

V+ = 3.6V, VA_= 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 (spec MIL-STD-883,
Method 3015)

kV

SWITCH AC PERFORMANCE

Insertion Loss I

LOS

RS = RL = 50Ω, unbalanced, f = 1MHz,
(Note 2)

0.6 dB

Return Loss R

LOS

f = 100MHz -23 dB

R

ONLED

R

FLAT(ON

I

LA_(OFF

I

LA_(ON

V + = 3V , I

_L E D _

= - 40m A, V

= 0, 1.5V , 3V

LE D _

0.01

±15

MAX4890E/MAX4892E

1000 Base-T ±15kV ESD Protection LAN Switch

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +3V to +3.6V, TA= TJ= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V+ = 3.3V, TA= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

V

CT1

f = 25MHz -50

Crosstalk

V

CT2

Any switch to any
switch; R

S

= RL =
50Ω, unbalanced,
Figure 1

f = 125MHz -26

dB

SWITCH AC CHARACTERISTIC

-3dB Bandwidth BW RS = RL = 50Ω, unbalanced

MHz

Off-Capacitance C

OFF

f = 1MHz, _B_, A_ 3.5 pF

On-Capacitance C

ON

f = 1MHz, _B_, A_ 6.5 pF

Turn-On Time t

ON

V

A_

= 1V, R

L

, 100Ω, Figure 2 50 ns

Turn-Off Time t

OFF

VA_ = 1V, RL, 100Ω, Figure 2 50 ns

Propagation Delay

RS = RL = 50Ω, unbalanced, Figure 3 0.1 ns

Output Skew Between Ports t

SK(o)

Skew between any two ports, Figure 4

ns

SWITCH LOGIC

Input-Voltage Low V

IL

V+ = 3.0V 0.8

Input-Voltage High V

IH

V+ = 3.6V 2.0

V

Input-Logic Hysteresis V

HYST

V+ = 3.3V

mV

Input Leakage Current I

SEL

V+ = 3.6V, V

SEL

= 0 or V+ -5 +5 µA

Operating Supply-Voltage Range

V+ 3.0 3.6 V

Quiescent Supply Current I+ V+ = 3.6V, V

SEL

= 0 or V+

µA

Note 1: Specifications at -40°C are guaranteed by design.
Note 2: Guaranteed by design.

t

PLH, tPHL

650

0.01

100

280 450

MAX4890E/MAX4892E

1000 Base-T, ±15kV ESD Protection LAN Switches

4 _______________________________________________________________________________________

0

2

1

4

3

5

6

0 1.0 1.50.5 2.0 2.5 3.0

ON-RESISTANCE vs. V

A_

MAX4890E toc01

VA_ (V)

R

ON

(Ω)

TA = +85°C

TA = +25°C

TA = -40°C

0

8

10

12

14

6

2

4

16

18

22
20

24

01.0

0.5

1.5 2.0 2.5 3.0

LED_ON-RESISTANCE vs. V

LED_

MAX4890E toc02

V

LED_

(V)

R

ONLED

(Ω)

TA = +85°C

TA = +25°C

TA = -40°C

0

12

8

4

16

20

24

28

32

36

40

-40 10-15 35 60 85

LEAKAGE CURRENT vs. TEMPERATURE

MAX4890E toc03

TEMPERATURE (°C)

LEAKAGE CURRENT (pA)

ILA_(ON)

ILA_(OFF)

200

220

240

260

280

300

320

340

-40 -15 10 35 60 85

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

MAX4890E toc04

TEMPERATURE (°C)

QUIESCENT SUPPLY CURRENT (µA)

V+ = 3.6V

SINGLE-ENDED INSERTION LOSS

vs. FREQUENCY

MAX4890E toc05

FREQUENCY (MHz)

INSERTION LOSS (dB)

10010

-7

-6

-5

-4

-3

-2

-1

0

-8
1 1000

Typical Operating Characteristics

(V+ = 3.3V, TA= +25°C, unless otherwise noted.)