Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - analogue switches µDFN 10

General Description

The MAX4906EF are electrostatic discharge (ESD)-pro-

tected analog switches that combine low on-capacitance

) and low on-resistance (R

) necessary for high-

performance switching applications. The COM_ inputs

are protected against ±15kV ESD without latchup or dam-

age. 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 protect-

ed 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

, 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 quies-

cent 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

)

♦ -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

Ordering Information

19-0613; Rev 2; 3/09

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 a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4906EFELB+T -40°C to +85°C 10 μDFN AAJ

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

V+

NC1

NC2

NO1COM1

GND

MAX4906EF

μDFN

NO2COM2

TOP VIEW

Pin Configuration

EYE DIAGRAM

200ps/div

V+ = 3.3V

BIAS

= 9mA

UI = 2.08ns

NO1OUT

100mV/div

NO2OUT

USB 2.0

HIGH SPEED

TRANSMIT

TEMPLATE

Typical Operating Characteristics

Summary of content (13 pages)

PAGE 1
9-0613; Rev 2; 3/09 High-/Full-Speed USB 2.0 Switches with High ESD 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.
PAGE 2
MAX4906EF High-/Full-Speed USB 2.0 Switches with High ESD ABSOLUTE MAXIMUM RATINGS (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).......
PAGE 3
High-/Full-Speed USB 2.0 Switches with High ESD (V+ = +2.7V to +3.6V, TA = TMIN to TMAX, charge-pump enabled, unless otherwise noted. Typical values are at V+= 3.3V, TA = +25°C.) (Note 2) PARAMETER Off-Leakage Current SYMBOL INC_, INO_ MIN TYP MAX UNITS -1 +1 µA -1 +1 µA (ON) V+ = 3.6V, VCOM = 0.3V, 3.3V; VNO_ or VNC_ = 0.3V, 3.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (V+ = +2.7V to +3.6V, TA = TMIN to TMAX, charge-pump enabled, unless otherwise noted. Typical values are at V+= 3.3V, TA = +25°C.) (Note 2) PARAMETER SYMBOL Total Harmonic Distortion Plus Noise CONDITIONS MIN TYP MAX UNITS THD+N VCOM_ = 2VP-P, RL = 600Ω, f = 20Hz to 20kHz 0.01 % Q VGEN = 1.5V, RGEN = 0Ω, CL = 100pF, Figure 6 20 pC Charge Injection SWITCH LOGIC Logic-Input Voltage Low VIL Logic-Input Voltage High VIH Input-Logic Hysteresis 0.
PAGE 5
High-/Full-Speed USB 2.0 Switches with High ESD 15 10 5 160 140 V+ = 2.7V 120 100 80 60 40 220 MAX4906EF toc06 V+ = 3.6V 180 QUISCENT SUPPLY CURRENT (μA) 20 QUIESCENT SUPPLY CURRENT (μA) CL = 100pF MAX4906EF toc05 200 MAX4906EF toc04 25 200 180 160 20 0 140 0 1.1 2.2 3.3 -40 -15 VCOM (V) 10 35 60 1.1 2.2 3.3 LOGIC LEVEL (V) TEMPERATURE (°C) LOGIC-INPUT LOW THRESHOLD vs. SUPPLY VOLTAGE TURN-ON/-OFF TIME vs. SUPPLY VOLTAGE 0.8 MAX4906EF toc08 5 MAX4906EF toc07 1.
PAGE 6
Typical Operating Characteristics (continued) (V+ = 3.3V, TA = +25°C, unless otherwise noted.) SAME SWITCH OUTPUT SKEW vs. SUPPLY VOLTAGE 9 8 230 tPLH 220 210 7 OUTPUT SKEW (ps) OUTPUT SKEW (ps) 240 6 5 4 3 20 10 2 tPHL 1 0 -40 -15 10 35 TEMPERATURE (°C) 60 85 0 2.7 3.0 3.3 SUPPLY VOLTAGE (V) 3.6 1 MAX4906EF toc14 -20 RL = 600Ω -30 0.1 -40 THD+N (%) OFF-ISOLATION AND CROSSTALK (dB) 0 3.0 3.3 SUPPLY VOLTAGE (V) TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 7
High-/Full-Speed USB 2.0 Switches with High ESD PIN NAME FUNCTION 1 IN Digital Control Input. IN controls switch 1 and switch 2. 2 QP Charge-Pump Enable Input. Drive QP high to turn charge pump off. For normal operation, drive QP low.
PAGE 8
High-/Full-Speed USB 2.0 Switches with High ESD MAX4906EF Test Circuits/Timing Diagrams (continued) 10nF V+ V+ COM_ MAX4906EF IN CAPACITANCE METER VIL OR VIH NC_ or NO_ f = 1MHz GND Figure 2. Channel Off-/On-Capacitance MAX4906EF V+ V+ COM_ NO_ OR NC_ VN_ LOGIC INPUT 50% VIL VOUT RL t OFF CL IN VOUT GND LOGIC INPUT SWITCH OUTPUT CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VN_ RL + RON ( ) t r < 5ns t f < 5ns VIH 0.
PAGE 9
High-/Full-Speed USB 2.
PAGE 10
High-/Full-Speed USB 2.0 Switches with High ESD MAX4906EF Test Circuits/Timing Diagrams (continued) 5V 2.5V 3V VCOM_ 0V tPF tFPR VPF VNO_ 3V 2.5V 1.5V VNC_ 0V Figure 5. MAX4906EF Fault-Protection Response/Recovery Time V+ MAX4906EF ΔVOUT V+ RGEN VOUT COM_ NC_ OR NO_ VOUT IN OFF CL V GEN GND OFF ON IN VIL TO VIH IN OFF ON OFF Q = (ΔV OUT )(C L ) LOGIC-INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. Figure 6.
PAGE 11
High-/Full-Speed USB 2.0 Switches with High ESD V+ QP 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. When QP is driven low, the charge pump is enabled and the switches enter an improved high-performance mode. Applications Information MAX4906EF IN USB Switching NO1 COM1 NC1 NO2 COM2 NC2 The MAX4906EF analog switch is fully compliant with the USB 2.0 specification.
PAGE 12
MAX4906EF High-/Full-Speed USB 2.0 Switches with High ESD ASIC I D+ USB TRANSCEIVER RD 1500Ω RC 1MΩ MAX4906EF VBUS CHARGE-CURRENTLIMIT RESISTOR DNC1 COM1 D+ COM2 D- NO1 HIGHVOLTAGE DC SOURCE Cs 100pF DISCHARGE RESISTANCE DEVICE UNDER TEST STORAGE CAPACITOR NC2 ASIC II NO2 D+ USB TRANSCEIVER Figure 9a. Human Body ESD Test Model DGND USB CONNECTOR Figure 7. USB Data Routing IP 100% 90% Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES 36.
PAGE 13
High-/Full-Speed USB 2.0 Switches with High ESD REVISION NUMBER REVISION DATE 0 8/06 1 11/07 2 3/09 DESCRIPTION Initial release. PAGES CHANGED — Changed the Electrical Characteristics table. Changed the Electrical Characteristics table to show QP = GND. 2, 4 2, 3, 4 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.