Datasheet

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General Description

The MAX4999 differential Hi-Speed USB analog multi-

plexer features low on-capacitance (C

) switching,

making it an ideal solution for the USB server/mass

storage market. The MAX4999 is designed for USB 2.0

low-/full-/Hi-Speed applications with capability of sup-

porting data rates up to 480Mbps.

The MAX4999 is a differential 8:1 multiplexer. The

MAX4999 features three digital inputs to control the sig-

nal path. Typical applications include switching a USB

connector between eight USB hosts and a USB device.

An enable input (EN) is provided to disable all channels

and place the device into a high-impedance state

(standby mode), shutting off the charge pump for mini-

mum power consumption.

The MAX4999 operates from a +3.0V to +3.6V power-

supply voltage and is specified over the -40°C to +85°C

extended temperature range. The MAX4999 is available

in a 5mm x 5mm, 32-pin TQFN package.

Applications

Keyboard, Video, Mouse (KVM)

Servers/RAID

Mass Storage

Workstations

Features

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

o Low 6.5Ω (typ) On-Resistance (R

)

o -3dB Bandwidth: 1200MHz (typ)

o Enable Input Puts All Channels in High-

Impedance State (Standby Mode)

o Low Operating Current (1µA) and Ultra-Low

Quiescent Current (30nA) in Standby Mode

o Low Threshold Eliminates the Need for

Translators in 1.8V Low-Voltage Systems

o Small 32-Pin, 5mm x 5mm, TQFN Package

MAX4999

USB 2.0 Hi-Speed Differential

8:1 Multiplexer

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4127; Rev 1; 6/11

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-free package.

EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX4999ETJ+ -40°C to +85°C 32 TQFN-EP*

Pin Configuration

MAX4999

TQFN

5mm x 5mm

TOP VIEW

COM0

COM1

GND

D4_0

GND

D3_1

D3_0

D6_1

4567

2324 22 20 19 18

D6_0

GND

D1_1

D1_0

GND

D4_1

D7_1

D0_1

D7_0

D0_0

GND

D2_0

D5_0

D2_1

GND

D5_1

*CONNECT EXPOSED PAD TO GND.

*EP

Summary of content (11 pages)

PAGE 1
9-4127; Rev 1; 6/11 USB 2.0 Hi-Speed Differential 8:1 Multiplexer The MAX4999 differential Hi-Speed USB analog multiplexer features low on-capacitance (CON) switching, making it an ideal solution for the USB server/mass storage market. The MAX4999 is designed for USB 2.0 low-/full-/Hi-Speed applications with capability of supporting data rates up to 480Mbps. The MAX4999 is a differential 8:1 multiplexer. The MAX4999 features three digital inputs to control the signal path.
PAGE 2
MAX4999 USB 2.0 Hi-Speed Differential 8:1 Multiplexer ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC ...........................................................................-0.3V to +4V All Other Pins (Note 1)..............................................-0.3V to +4V Continuous Current (COM_ to any switch) .......................±60mA Peak Current (COM_ to any switch) (pulsed at 1ms, 10% duty cycle)..........................................................
PAGE 3
USB 2.0 Hi-Speed Differential 8:1 Multiplexer (VCC = +3.0V to +3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN Turn-Off Time tOFF VD_ _0 or VD_ _1 = +1.5V, RL = 300Ω, CL = 35pF, VIH = VCC, VIL = 0V (Figure 1) Output Skew Same Port tPD Skew between any D_ _0, D_ _1 line, same port 45Ω unbalanced I/O, f = 240MHz (Figure 2) Input Logic Low VIL VCC = +3.0V Input Logic High VIH VCC = +3.
PAGE 4
USB 2.0 Hi-Speed Differential 8:1 Multiplexer MAX4999 Test Circuits/Timing Diagrams (continued) MAX4999 RS IN+ D0_1 COM1 OUT+ RL RS IN- D0_0 COM0 RISE-TIME PROPAGATION DELAY = tPLH. FALL-TIME PROPAGATION DELAY = tPHL. tSK = |tPLH - tPHL|. RS = RL = 50Ω. OUTRL C0 C1 C2 VCC VIN+ 50% 50% 50% 50% 0V V+ VIN0V tPLH tR tPHL VCC tF 90% VOUT+ 90% 50% 50% 10% 0V 10% VCC 50% VOUT- 50% 0V tPHL tPLH Figure 2.
PAGE 5
USB 2.0 Hi-Speed Differential 8:1 Multiplexer VCC 0.1µF VIN V+ CHANNEL SELECT NETWORK ANALYZER 50Ω 50Ω D_ _ _ C0 C1 C2 ON-LOSS = 20log MAX4999 VOUT HIGH EN OFF-ISOLATION = 20log COM_ MEAS. REF. CROSSTALK = 20log GND 50Ω VOUT VIN VOUT VIN VOUT VIN 50Ω MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" USB_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" USB_ TERMINAL ON EACH SWITCH.
PAGE 6
Typical Operating Characteristics (VCC = +3.3V, TA = +25°C, unless otherwise noted.) RON (Ω) RON (Ω) 6.0 5.4 5.2 TA = +25°C 5.5 TA = -40°C 5.0 5.0 VCC = +3.6V 0.6 1.2 1.8 2.4 3.0 2.2 LOGIC THRESHOLD vs. SUPPLY VOLTAGE 0.88 0.75 VIL 0.80 60 -10 ON-RESPONSE -20 -30 85 CROSSTALK -40 -50 -60 -70 OFF-ISOLATION -80 0.75 0.63 35 FREQUENCY RESPONSE 0.90 0.85 10 0 MAGNITUDE (dB) 1.00 VIH 0.95 -15 -40 MAX4999 toc05 1.00 LOGIC THRESHOLD (V) VCC = +3.
PAGE 7
USB 2.0 Hi-Speed Differential 8:1 Multiplexer PIN NAME 1, 11, 14, 17, 21, 24, 27, 30 FUNCTION GND Ground 2, 20 3 VCC EN Power-Supply Input. Bypass VCC to GND with a 0.1µF capacitor placed as close to VCC as possible.
PAGE 8
USB 2.0 Hi-Speed Differential 8:1 Multiplexer MAX4999 Functional Diagram/Truth Table Applications Information Increasing USB Channels VCC MUX D0 _1 D1 _1 D2 _1 D3 _1 D4 _1 D5 _1 D6 _1 D7 _1 MUX D0 _0 D1 _0 D2 _0 D3 _0 D4 _0 D5 _0 D6 _0 D7 _0 MAX4999 COM1 COM0 The MAX4999 features an enable input that allows two MAX4999s to be connected, allowing multiplexing between 16 USB channels. Figure 4 shows the typical application with a single USB common terminal multiplexed to eight channels (8:1).
PAGE 9
USB 2.0 Hi-Speed Differential 8:1 Multiplexer + - D5_1 D5_0 USB6 + - D6_1 D6_0 USB7 + - D7_1 D7_0 23 22 D3_0 D3_1 USB3 + - D4_1 D4_0 USB5 MAX4999 USB4 - + 19 18 25 26 16 15 28 29 13 12 MAX4999 31 32 10 9 D2_1 + USB2 - D2_0 D1_1 + USB1 - D1_0 D0_1 + USB0 - D0_0 +3.3V VCC 2, 20 4 5 3 6 7 8 1, 11, 14, 17, 21, 24, 27, 30 GND EN C0 C1 C2 - + COMMON Figure 4.
PAGE 10
MAX4999 USB 2.0 Hi-Speed Differential 8:1 Multiplexer Package Information Chip Information PROCESS: CMOS 10 For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 11
USB 2.0 Hi-Speed Differential 8:1 Multiplexer REVISION NUMBER REVISION DATE 0 5/08 Initial release 1 6/11 Added Package Thermal Characteristics; renamed pins in Figure 4; changed pin references in Electrical Characteristics, Figures 3 and 5, TOCs, and Functional Diagram. DESCRIPTION PAGES CHANGED — 2, 5, 6, 8, 9 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.