MAXIM MAX4927 User Manual

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General Description

The MAX4927 meets the needs of high-speed differential switching, including that of Gigabit Ethernet (10/100/1000) Base-T switching as well as LVDS and LVPECL switching. The MAX4927 provides enhanced ESD protection up to ±15kV and excellent high-frequency response, making the device especially useful for interfaces that must go to an outside connection.

The MAX4927 offers extremely low capacitance (C

ON

),

as well as low on-resistance (R

ON

), for low-insertion loss and very wide bandwidth. In addition to the four pairs of DPDT switches, the MAX4927 provides LED switching for laptop computer/docking station use.

The MAX4927 is pin-to-pin equivalent to the PI3L500-A and STMUX1000L. The MAX4927 can replace either device in those applications, improving ESD protection and eliminating external ESD components. The MAX4927 is available in a space-saving 56-pin TQFN package and operates over the extended -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

♦ ESD Protection

±15kV–IEC 61000-4-2 Air-Gap Discharge ±8kV–IEC 61000-4-2 Contact Discharge ±15kV–Human Body Model

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

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

ON

)

♦ Ultra-Low 8pF (typ) On-Capacitance (C

ON

)

♦ -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

♦ Low 450µA (max) Quiescent Current

♦ Bidirectional 8 to 16 Multiplexer/Demultiplexer

♦ Standard Pin Out, Matching the P13L500-A and

STMUX1000L

♦ Space-Saving Lead-Free Package

56-Pin, 5mm x 11mm, TQFN Package

MAX4927

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

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-0841; Rev 0; 6/07

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

+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.

Pin Configuration

PINPACKAGE

LED

SWITCHES

PKG

CODE

TOP VIEW

GND

V

DD

2LED2

2LED1

GND

LED2

GND

V

DD

*CONNECT EXPOSED PADDLE TO GND OR LEAVE EXPOSED PADDLE UNCONNECTED.

0B2

1B1

0B1

48 47 46 45 44 43

49

50

51

52

53

54

55

56

1+2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

A1

A0

GND

PART

DD

4B1

5B1

4B2

V

GND

1B2

DD

V

40 39 38 37 36 35 34 33 32 31 30 29

42 41

MAX4927

DD

A3

A2

N.C.

GND

A4

V

GND

TQFN

5mm x 11mm

A5

A6

GND

3B2

2B2

3B1

2B1

GND

7B1

6B2

7B2

6B1

GND

5B2

28

GND

27

V

DD

26

1LED2

25

0LED2

GND

24

1LED1

23

0LED1

22

*EP

GND

21

DD

A7

SEL

V

GND

LED0

LED1

MAX4927ETN+ 56 TQFN-EP* 3 T56511-1

MAX4927

1000 Base-T, ±15kV ESD Protection 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.

VDD………………………………………………………-0.3V to +4V All Other Pins…………………………………-0.3V to (V

DD

+ 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)

56-Pin TQFN (derate 40.9mW/°C above +70°C) .......5278mW

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

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

MIN

to T

MAX

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

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ANALOG SWITCH

On-Resistance R

ON

VDD = 3V,

= -40mA,

I

A_

V

= 0, 1.5V, 3V

A_

TA = +25°C 4 5.5

to T

T

MIN

MAX

6.5

Ω

On-Resistance Match Between Switch Pairs (Note 2)

On-Resistance Flatness R

FLAT(ON

On-Resistance LED Switches R

Off-Leakage Current I

On-Leakage Current I

LA_(OFF

LA_(ON

ESD PROTECTION

ESD Protection

SWITCH AC PERFORMANCE

Insertion Loss I

Return Loss R

Crosstalk

VDD = 3V,

ΔR

ON

I

A_

V

A_

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

ONLEDV D D

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

_B1

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

_B1

IEC 61000-4-2 Air-Gap Discharge ±15

IEC 61000-4-2 Contact Discharge ±8

Human Body Model (spec MIL-STD-883, Method 3015)

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

f = 100MHz -23 dB

Any switch to any switch; R 50Ω, unbalanced, Figure 1

V

LOS

CT1

CT2

= -40mA,

= 0, 1.5V, 3V

= 3V , I

_LE D _

or V

= 3.3V, 0.3V

_B2

= 0.3V, 3.3V, or floating

_B2

= RL =

S

TA = +25°C 0.5 1.5

to T

T

MIN

MAX

= 1.5V, 3V 0.01 Ω

A_

= - 40m A, V

= 0, 1.5V , 3V 40 Ω

LE D _

-1 +1 µA

f = 25MHz -50

f = 100MHz -26

2

Ω

kV

±15

0.6 dB

dB

MAX4927

1000 Base-T ±15kV ESD Protection LAN Switch

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

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

MIN

to T

MAX

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

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

Figure 1. Single-Ended Bandwidth, Crosstalk, and Off-Isolation

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SWITCH AC CHARACTERISTICS

-3dB Bandwidth BW RS = RL = 50Ω, unbalanced 650 MHz

Off-Capacitance C

On-Capacitance C

Turn-On Time t

Turn-Off Time t

Propagation Delay t

Output Skew Between Ports t

SWITCH LOGIC

Input-Voltage Low V

Input-Voltage High V

Input-Logic Hysteresis V

Input Leakage Current I

Operating-Supply Voltage Range V

Quiescent Supply Current I

PLH, tPHLRS

OFF

ON

OFF

f = 1MHz, _B_, A_ 3.5 pF

f = 1MHz, _B_, A_ 6.5 pF

= 1V, R

V

A_

= 100Ω, Figure 2 50 ns

L

VA_ = 1V, RL = 100Ω, Figure 2 50 ns

= RL = 50Ω, unbalanced, Figure 3 0.15 ns

SK(o)

HYST

SEL

DD

Skew between any two ports, Figure 4 0.01 ns

VDD = 3.0V 0.8 V

IL

VDD = 3.6V 2.0 V

IH

VDD = 3.3V 100 mV

VDD = 3.6V, V

SEL

= 0V or V

DD

-1 +1 µA

3.0 3.6 V

VDD = 3.6V, V

SEL

= 0V or V

DD

280 450 µA

SINGLE-ENDED BANDWIDTH

NETWORK

ANALYZER

SINGLE-ENDED CROSSTALK

NETWORK

ANALYZER

NETWORK

ANALYZER

SINGLE-ENDED OFF-ISOLATION

NETWORK

ANALYZER

50Ω TRACE

R15

49.9Ω

MAX4927

56 TQFN

A0 2

A2 7

A3 8

A4 11

0B1 48

2B1 43

4B1 37

SEL 17

3B1 42

V

DD

50Ω TRACE

R13

49.9Ω

R14

49.9Ω

OR 0V

50Ω TRACE

NETWORK ANALYZER

MAX4927

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

4 _______________________________________________________________________________________

Figure 2. Turn-On and Turn-Off Times

Figure 3. Propagation Delay Times

Figure 4. Output Skew

SEL

50%

t

ON

50%

t

OFF

50%

A_

t

OFF

ON

50%

_B1

t

PHLX

t

3.0V

2.0V

1.0V

PHLY

V

2.0V

V

OH

OL

V

OH

2.0V

V

OL

V

IH

V

IL

0V

_B2

0V

3.0V

2.0V

1.0V

A_

t

PLHX

_B_

t

PLHY

_B_

OUTPUT SKEW = t

THE MAX4927 SWITCHES ARE FULLY BIDIRECTIONAL.

SK(O)

= |t

PLHY

- t

| OR |t

PLHX

PHLY

- t

|

PHLX

t

PLH

_B_

PULSE SKEW = t

THE MAX4927 SWITCHES ARE FULLY BIDIRECTIONAL.

SK(p)

= |t

PHL

- t

|

PLH

t

PHL

V

H

2.0V

V

L