MAXIM MAX4906EF User Manual

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General Description

The MAX4906EF are electrostatic discharge (ESD)-pro­tected analog switches that combine low on-capacitance
(CON) and low on-resistance (RON) necessary for high­performance switching applications. The COM_ inputs
are protected against ±15kV ESD without latchup or dam­age. The device is designed for USB 2.0 high-speed
applications at 480Mbps. The switches also handle all the
requirements for USB low- and full-speed signaling.

The MAX4906EF features two single-pole/double-throw
(SPDT) switches. The device is fully specified to operate
from a single +2.7V to +3.6V power supply and is protect­ed against a +5.5V short to all analog inputs (COM_, NC_,
NO_). This feature makes the MAX4906EF fully compliant
with the USB 2.0 specification of +5.5V fault protection.
The device features a low threshold voltage and a +1.4V
VIH, permitting them to be used with low-voltage logic.
The device features a QP input that when driven high,
turns the charge pump off and sets the device in standby
mode. When the device is in standby mode, the quies­cent supply current is reduced to 3µA (max) and the
switches remain operable.

The MAX4906EF is available in a space-saving, 2mm x
2mm µDFN package and operates over a -40°C to +85°C
temperature range.

Applications

Features

♦ ±15kV (Human Body Model) ESD Protection,

on COM_

♦ Fully Specified for a Single +2.7V to +3.6V

Power-Supply Voltage

♦ Low 4Ω (typ), 7Ω (max) On-Resistance (R

ON

)

♦ -3dB Bandwidth: 500MHz (typ)
♦ Low Bit-to-Bit Skew ≤ 20ps

♦ Charge-Pump Noise = 90µV (typ)
♦ Charge-Pump Enable
♦ No Need for Logic-Level Shifters for 1.4V or

Above

♦ COM

_

Analog Inputs Fault-Protected Against

Shorts to USB Supply Rail Up to +5.5V

♦ Low Supply Current 3µA (max) in Standby
♦ Space-Saving 10-Pin, 2mm x 2mm µDFN Package

MAX4906EF

High-/Full-Speed USB 2.0 Switches

with High ESD

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-0613; Rev 1; 11/07

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.

Note: The device operates over the -40°C to +85°C operating

temperature range.
+Denotes a lead-free package.

PART

PIN-PACKAGE

TOP

PKG

CODE

MAX4906EFELB+T

10 µDFN-10 AAJ

L1022-1

USB Switching

Cell Phones

PDAs

Digital Still Cameras

GPS

Notebook Computers

Relay Replacements

Ethernet Switching

Video Switching

Bus Switches

T3/E3 Switches for
Redundancy Protection

1

2

3

4

5

10

9

8

7

6

V+

NC1

NC2

NO1COM1

GND

QP

IN

MAX4906EF

μDFN

NO2COM2

TOP VIEW

+

Pin Configuration

EYE DIAGRAM

200ps/div

V+ = 3.3V
I

BIAS

= 9mA

UI = 2.08ns

V

NO1OUT

100mV/div

V

NO2OUT

USB 2.0

HIGH SPEED

TRANSMIT
TEMPLATE

Typical Operating Characteristics

MARK

High-/Full-Speed USB 2.0 Switches
with High ESD

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = +2.7V to +3.6V, TA= T

MIN

to T

MAX

, charge-pump enabled, unless otherwise noted. Typical values are at V+= 3.3V, TA=

+25°C.) (Note 2)

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.

Note 1: Signals on IN, QP exceeding GND are clamped by internal diodes. Limit forward-diode current to maximum current rating.

(All voltages referenced to GND.)

V+ .............................................................................-0.3V to +4V

IN, QP (Note 1).........................................................-0.3V to +4V

COM_, NO_, NC_ ..................................................-0.3V to +5.5V

Continuous Current (COM_ to NO_/NC_) ......................±120mA

Peak Current, (COM_ to NO_/NC_)

(pulsed at 1ms 10% duty cycle).................................±240mA

Continuous Power Dissipation (T

A

= +70°C)

10-Pin µDFN (derate 5.0mW/°C above +70°C) ...........403mW

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

MAX4906EF

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ANALOG SWITCH

Analog Signal Range

V

NC _

QP = 0 or V+ (Note 3) 0 3.6 V

Fault-Protection Trip Threshold
(Note 9)

V

FP

3.9

V

TA = +25°C 3.8 5

V+ = 2.7V,
I

COM_

= -10mA,

V

COM_

= 0V, 1.5V,

QP = 0V

6

Ω

TA = +25°C 4 7

On-Resistance, Charge-Pump
Enabled

R

ON

V+ = 2.7V,
I

COM_

= -10mA,

V

COM_

= 2.7V,

QP = 0V

8

Ω

TA = +25°C 5 12

V+ = 3.0V,
I

COM_

= -10mA,

V

COM_

= 0V, 1.5V,

QP = V+

13

TA = +25°C 8 15

On-Resistance, Charge-Pump
Disabled

R

ON

V+=2.7V,
I

COM_

= -10mA,

V

COM_

= 0V, 1.5V,

QP = V+

17

Ω

TA = +25°C 0.5 0.8

On-Resistance Match Between
Channels

ΔR

ON

V+ = 2.7V,
I

COM_

= -10mA,

V

COM_

= 0V, 1.5V, 2.7V

(Note 4)

1.0

Ω

On-Resistance Flatness

)

V+ = 2.7V,
I

COM_

= -10mA, V

COM_

= 0V, 1.5V

(Note 5)

0.5 Ω

V

_,V

NO_

,

COM

3.62

TA = T

MIN

to T

MAX

TA = T

MIN

to T

MAX

R

FLAT(ON

TA = T

TA = T

TA = T

MIN

MIN

MIN

to T

to T

to T

MAX

MAX

MAX

4.20

MAX4906EF

High-/Full-Speed USB 2.0 Switches

with High ESD

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +2.7V to +3.6V, TA= T

MIN

to T

MAX

, charge-pump enabled, unless otherwise noted. Typical values are at V+= 3.3V, TA=

+25°C.) (Note 2)

PARAMETER

CONDITIONS

UNITS

Off-Leakage Current

I

NC_, INO_

(OFF)

V+ = 3.6V, V

COM_

= 0.3V, 3.3V;

V

NO_

or V

NC_

= 3.3V, 0.3V

-1 +1 µA

On-Leakage Current

I

NC_, INO_

(ON)

V+ = 3.6V, V

COM

= 0.3V, 3.3V;

V

NO_

or V

NC_

= 0.3V, 3.3V, or floating

-1 +1 µA

SWITCH AC PERFORMANCE

On-Channel -3dB Bandwidth BW RL = RS = 50Ω, signal = 0dBm, Figure 1

MHz

f = 10MHz; V

NO_

, V

NC_

= 1V

P-P

;

R

L

= RS = 50Ω, Figure 1

-60

Off-Isolation V

ISO

f = 250MHz; V

NO_

, V

NC_

= 1V

P-P

;

R

L

= RS = 50Ω, Figure 1

-32

dB

f = 10MHz; V

NO_

, V

NC_

= 1V

P-P

;

R

L

= RS = 50Ω, Figure 1

-59

Crosstalk (Note 6) V

CT

f = 250MHz; V

NO_

, V

NC_

= 1V

P-P

;

R

L

= RS = 50Ω, Figure 1

-31

dB

Charge-Pump Noise (Note 7) V

QP

Any input or output switch terminal = 50Ω 90 µV

SWITCH DYNAMICS

NO_, NC_, COM_
Off-Capacitance (Note 8)

C

(OFF)

f = 1MHz, Figure 2 9 10 pF

NO_, NC_, COM_
On-Capacitance (Note 8)

C

(ON)

f = 1MHz, Figure 2 10 12 pF

Switch On-Capacitance Matching

(Note 8)

C

ONM

f = 1MHz 0.4 pF

Turn-On Time t

ON

V

N O

_, V

N C

_ = 1.5V ; RL = 300Ω , C L = 35p F,

V

IH

= V + , V IL = 0V , Q P = 0V ,

Fi g ur e 3

1.4 ns

Turn-Off Time t

OFF

VNO_, VNC_ = 1.5V; RL = 300Ω, CL = 35pF,
V

IH

= V+, VIL = 0V, Q P = 0V, Figure 3

35 ns

Propagation Delay

RL = RS = 50Ω, Figure 4 0.2 ns

Fault-Protection Response Time t

FP

V

COM_

= 0 to 5V step,

R

L

= RS = 50Ω, CL = 10pF, Figure 5

1µs

Fault-Protection Recovery Time t

FPR

V

COM_

= 5V to 3V step,

R

L

= RS = 50Ω, CL = 10pF, Figure 5

1µs

Output Skew Between Switches
(Note 8)

t

SK(o)

Skew between switch 1 and switch 2,
R

L

= RS = 50Ω, Figure 4

20 100 ps

Output Skew Same Switch
(Note 8)

t

SK(p)

Skew between opposite transitions in same
switch, R

L

= RS = 50Ω, Figure 4

5 100 ps

SYMBOL

t

PLH_,tPHL

MIN TYP MAX

500

MAX4906EF

High-/Full-Speed USB 2.0 Switches
with High ESD

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +2.7V to +3.6V, TA= T

MIN

to T

MAX

, charge-pump enabled, unless otherwise noted. Typical values are at V+= 3.3V, TA=

+25°C.) (Note 2)

PARAMETER

CONDITIONS

UNITS

Total Harmonic Distortion Plus
Noise

V

COM_

= 2V

P-P

, RL = 600Ω, f = 20Hz to

20kHz

%

Charge Injection Q

V

GEN

= 1.5V, R

GEN

= 0Ω, CL = 100pF,

Figure 6

20 pC

SWITCH LOGIC

Logic-Input Voltage Low V

IL

0.4 V

Logic-Input Voltage High V

IH

1.4 V

Input-Logic Hysteresis V

HYST

mV

Input Leakage Current I

IN

V+ = 3.6V, VIN = 0 or V+ -1 +1 µA

Operating Supply-Voltage Range

V+ 2.7 3.6 V

Quiescent Supply Current I+ V+ = 3.6V, VIN = 0 or V+, QP = 0V

µA

Quiescent Supply Current With
Charge-Pump Disabled

I+ V+ = 3.6V, V

IN

= 0 or V+, QP = V+ 3 µA

ESD PROTECTION

COM_ Human Body Model

kV

Note 2: All units are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design

and not production tested.

Note 3: The switch will turn off for voltages above (V

FP

); therefore, protecting downstream circuits in case of a fault condition.

Note 4: ΔR

ON(MAX)

= | R

ON(CH1) – RON(CH2)

|

Note 5: Flatness is defined as the difference between the maximum and minimum value of on-resistance, as measured over

specified analog signal ranges.

Note 6: Between any two switches.
Note 7: Noise specification is measured peak to peak.
Note 8: Switch off-capacitance, switch on-capacitance, output skew between switches, and output skew same-switch limits are not

production tested; design guaranteed by correlation.

Note 9: Fault-protection trip threshold, limits are not production tested; guaranteed by design.

Typical Operating Characteristics

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

0

3

2

1

4

5

6

7

8

9

10

0

3

2

1

4

5

6

7

8

9

10

-40 10-15 35 60 85

LEAKAGE CURRENT vs. TEMPERATURE

MAX4906EF toc03

TEMPERATURE (°C)

COM ON-LEAKAGE CURRENT (nA)

COM OFF-LEAKAGE CURRENT (pA)

V+ = 3.6V

COM ON-LEAKAGE

COM OFF-LEAKAGE

0

2

1

4

3

5

6

01.80.9 2.7 3.6

ON-RESISTANCE vs. V

COM

MAX4906EF toc01

V

COM

(V)

R

ON

(Ω)

V+ = 2.7V

V+ = 3.6V

V+ = 3.3V

0

2

1

4

3

5

6

0 1.1 2.2 3.3

ON-RESISTANCE vs. V

COM

MAX4906EF toc02

V

COM

(V)

R

ON

(Ω)

TA = +85°C

TA = +25°C

TA = -40°C

SYMBOL

MIN TYP MAX

THD+N

0.01

100

160 1000

±15

MAX4906EF

High-/Full-Speed USB 2.0 Switches

with High ESD

_______________________________________________________________________________________ 5

140

160

180

200

220

0 1.1 2.2 3.3

QUIESCENT SUPPLY CURRENT

vs. LOGIC LEVEL

MAX4906EF toc06

LOGIC LEVEL (V)

QUISCENT SUPPLY CURRENT (μA)

0

0.2

0.6

0.4

0.8

1.0

LOGIC-INPUT LOW THRESHOLD

vs. SUPPLY VOLTAGE

MAX4906EF toc07

SUPPLY VOLTAGE (V)

LOGIC-INPUT LOW THRESHOLD (V)

2.7 3.0 3.3 3.6

V

IL

TURN-ON/-OFF TIME

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

t

ON

(μs)

MAX4906EF toc08

t

OFF

(ns)

30

32

34

36

38

40

2.7 3.0 3.3 3.6

0

1

2

3

4

5

t

OFF

t

ON

TURN-ON/-OFF TIME

vs. TEMPERATURE

TEMPERATURE (°C)

t

ON

(μs)

MAX4906EF toc09

t

OFF

(ns)

30

32

34

36

38

40

-40 -15 10 35 60 85

0

2

4

6

8

10

t

ON

t

OFF

RISE-/FALL-TIME PROPAGATION DELAY

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

OUTPUT RISE-/FALL-TIME DELAY (ps)

MAX4906EF toc10

2.7 3.0 3.3 3.6

200

210

220

230

240

250

t

PLH

t

PHL

Typical Operating Characteristics (continued)

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

CHARGE INJECTION vs. V

COM

V

COM

(V)

CHARGE INJECTION (pC)

MAX4906EF toc04

0 1.1 2.2 3.3

0

5

10

15

20

25

CL = 100pF

0

60

40

20

80

100

120

140

160

180

200

-40 10-15 35 60 85

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

MAX4906EF toc05

TEMPERATURE (°C)

QUIESCENT SUPPLY CURRENT (μA)

V+ = 3.6V

V+ = 2.7V