View MAX4999ETJ_4179389.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-4127; Rev 0; 5/08
USB 2.0 Hi-Speed Differential 8:1 Multiplexer
General Description
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. 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 minimum power consumption. The MAX4999 operates from a +3.0V to +3.6V powersupply voltage and is specified over the -40C to +85C extended temperature range. The MAX4999 is available in a 5mm x 5mm, 32-pin TQFN package. Low 6.5 (typ) On-Resistance (RON) -3dB Bandwidth: 1200MHz (typ) Enable Input Puts All Channels in HighImpedance State (Standby Mode) Low Operating Current (1A) and Ultra-Low Quiescent Current (30nA) in Standby Mode Low Threshold Eliminates the Need for Translators in 1.8V Low-Voltage Systems Small 32-Pin, 5mm x 5mm, TQFN Package
Features
Single +3.0V to +3.6V Power-Supply Voltage
MAX4999
Ordering Information
PART MAX4999ETJ+ TEMP RANGE -40C to +85C PIN-PACKAGE 32 TQFN-EP*
Applications
Keyboard, Video, Mouse (KVM) Servers/RAID Mass Storage Workstations
+Denotes a lead-free package. *EP = Exposed pad.
Pin Configuration
D4_0 D4_1 D3_1 D3_0 18 GND GND VCC GND 17 16 15 14 13 D2_1 D2_0 GND D1_1 D1_0 GND D0_1 D0_0 12 11 *EP 10 9 1 GND 2 VCC 3 EN 4 COM0 5 COM1 6 C0 7 C1 8 C2
TOP VIEW
24 D5_1 25 D5_0 26 GND 27 D6_1 28 D6_0 29 GND 30 D7_1 31 D7_0 32
23
22
21
20
19
MAX4999
TQFN 5mm x 5mm
*CONNECT EXPOSED PAD TO GND.
________________________________________________________________ Maxim Integrated Products
1
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.
USB 2.0 Hi-Speed Differential 8:1 Multiplexer MAX4999
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)..........................................................120mA Continuous Power Dissipation (TA = +70C) 32-Lead TQFN (derate 34.5mW/C above +70C) ....2759mW Junction-to-Case Thermal Resistance (JC) (Note 2) 32-Lead TQFN ............................................................2.0C/W Junction-to-Ambient Thermal Resistance (JA) (Note 2) 32-Lead TQFN .............................................................29C/W Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: Signals exceeding GND are clamped by internal diodes. Limit forward-diode current to maximum current rating. Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25C.) (Note 3)
PARAMETER POWER SUPPLY Supply Voltage Quiescent Supply Current ANALOG SWITCH On-Resistance On-Resistance Match On-Resistance Match Between Channels Leakage Current COM_, D_0, D_1 SWITCH AC PERFORMANCE (Note 4) Crosstalk Off-Isolation Bandwidth -3dB On-Capacitance Off-Capacitance Propagation Delay Turn-On Time VDCT1 VOFF BW CON COFF tPD tON Any switch to non-paired switch at 500MHz (Figure 3) Any switch to non-paired switch at 240MHz (Figure 3) RL = 45 unbalanced (Figure 3) f = 1MHz Taken from S11 parameters at f = 240MHz f = 1MHz, COM_ Taken from S11 parameters at f = 240MHz RL = RS = 50 (Figure 2) VD0 or VD1 = +1.5V, RL = 300, CL = 35pF, VIH = VCC, VIL = 0V (Figure 1) -30 -27 1200 6 3.0 5 3.0 300 10 dB dB MHz pF pF ps s RON RONSC RONBC IL ICOM_ = 10mA VCOM_ = 1V, TA = +25C VCOM_ = 1V, TA = +25C VCC = +3.6V -1 6.5 12 0.8 1 +1 A VCC IO Charge pump on Charge pump off 3.0 3.6 5 1 V A SYMBOL CONDITIONS MIN TYP MAX UNITS
2
_______________________________________________________________________________________
USB 2.0 Hi-Speed Differential 8:1 Multiplexer
ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25C.) (Note 3)
PARAMETER Turn-Off Time Output Skew Same Port SWITCH LOGIC Input Logic Low Input Logic High Input Logic Hysteresis Input Leakage Current ESD PROTECTION All Pins Human Body Model 2 kV VIL VIH VHYST ILEAK VCC = +3.6V, VCOM_ = 0V or VCC -1 VCC = +3.0V VCC = +3.6V 1.7 200 +1 0.6 V V mV A SYMBOL tOFF tPD CONDITIONS VD0 or VD1 = +1.5V, RL = 300, CL = 35pF, VIH = VCC, VIL = 0V (Figure 1) Skew between any D_0, D_1 line, same port 45 unbalanced I/O, f = 240MHz (Figure 2) MIN TYP 10 30 MAX UNITS s ps
MAX4999
Note 3: All units are 100% production tested at TA = +85C. Limits over the operating temperature range are guaranteed by design and not production tested. Note 4: Guaranteed by design.
Test Circuits/Timing Diagrams
VCC MAX4999 VN_ D0_ OR D1_ COM_ VOUT RL C_ LOGIC INPUT GND SWITCH OUTPUT 0V t ON CL VOUT 0.9 x V0UT t OFF 0.9 x VOUT LOGIC INPUT VIH 50% VIL t R < 5ns t F < 5ns
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VN_ RL + RON
(
)
IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
Figure 1. Switching Time
_______________________________________________________________________________________ 3
USB 2.0 Hi-Speed Differential 8:1 Multiplexer MAX4999
Test Circuits/Timing Diagrams (continued)
MAX4999
RS IN+ D0_1 COM1 RL RS IND0_0 OUT+ RISE-TIME PROPAGATION DELAY = tPLH. FALL-TIME PROPAGATION DELAY = tPHL. tSK = |tPLH - tPHL|. RS = RL = 50.
COM2 RL
OUT-
C0 C1 C2
VCC VIN+ 0V V+ VIN0V tR 90% 50% 0V VCC VOUT0V tPHL tPLH 50% 50% 50% 10% 10% 90% tF 50% 50% 50% 50%
tPLH VCC VOUT+
tPHL
Figure 2. Propagation Delay and Skew
4
_______________________________________________________________________________________
USB 2.0 Hi-Speed Differential 8:1 Multiplexer
Test Circuits/Timing Diagrams (continued)
VCC 0.1F NETWORK ANALYZER 50 50
MAX4999
V+ CHANNEL SELECT C0 C1 C2 D_ _
VIN
OFF-ISOLATION = 20log
VOUT VIN VOUT VIN VOUT VIN
MAX4999
VOUT HIGH EN GND 50 50 COM_ MEAS. REF.
ON-LOSS = 20log
CROSSTALK = 20log
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. CROSSTALK IS MEASURED FROM ONE USB_ CHANNEL TO ANOTHER USB_ CHANNEL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
Figure 3. Off-Isolation, On-Loss, and Crosstalk
_______________________________________________________________________________________
5
USB 2.0 Hi-Speed Differential 8:1 Multiplexer MAX4999
Typical Operating Characteristics
(VCC = +3.3V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM
MAX4999 toc01
ON-RESISTANCE vs. VCOM
VCC = +3.3V
MAX4999 toc02
LEAKAGE CURRENT vs. TEMPERATURE
VCC = +3.6V
MAX4999 toc03
6.0 5.8 VCC = +3.0V 5.6 RON () 5.4 5.2 5.0 VCC = +3.6V 4.8 4.6 0 0.6 1.2 1.8 VCOM (V) 2.4 3.0 VCC = +3.3V
7.0 6.5 6.0 RON () 5.5 5.0 4.5 4.0
120 100 LEAKAGE CURRENT (nA)
TA = +85C
COM ON-LEAKAGE 80 60 40 20 0 COM OFF-LEAKAGE
TA = +25C
TA = -40C
3.6
0
1.1 VCOM (V)
2.2
3.3
-40
-15
10
35
60
85
TEMPERATURE (C)
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
VCC = +3.3V QUIESCENT SUPPLY CURRENT (A) 1.13 1.00 0.88 0.75 0.63 0.50 -40 -15 10 35 60 85 TEMPERATURE (C) VCC = +3.6V VCC = +3.0V
MAX4999 toc04
LOGIC THRESHOLD vs. SUPPLY VOLTAGE
MAX4999 toc05
FREQUENCY RESPONSE
-10 -20 -30 ON-RESPONSE CROSSTALK
MAX4999 toc06
1.25
1.00 0.95 LOGIC THRESHOLD (V) 0.90 0.85 0.80 0.75 0.70 3.0 3.2 3.3 3.5 VIL VIH
0
LOSS (dB)
-40 -50 -60 -70 -80 -90 -100 OFF-ISOLATION
3.6
1
10
100 FREQUENCY (MHz)
1000
10,000
SUPPLY VOLTAGE (V)
EYE DIAGRAM - SINGLE
MAX4999 toc07
EYE DIAGRAM - DOUBLE
MAX4999 toc08
6
_______________________________________________________________________________________
USB 2.0 Hi-Speed Differential 8:1 Multiplexer
Pin Description
PIN 1, 11, 14, 17, 21, 24, 27, 30 2, 20 3 4 5 6 7 8 9 10 12 13 15 16 18 19 22 23 25 26 28 29 31 32 -- NAME GND VCC EN COM0 COM1 C0 C1 C2 D0_0 D0_1 D1_0 D1_1 D2_0 D2_1 D3_0 D3_1 D4_1 D4_0 D5_1 D5_0 D6_1 D6_0 D7_1 D7_0 EP Ground Power-Supply Input. Bypass VCC to GND with a 0.1F capacitor placed as close to VCC as possible. Enable Input Analog Switch Common D- Terminal Analog Switch Common D+ Terminal Control Input 0 Control Input 1 Control Input 2 Analog Switch 0 D- Terminal Analog Switch 0 D+ Terminal Analog Switch 1 D- Terminal Analog Switch 1 D+ Terminal Analog Switch 2 D- Terminal Analog Switch 2 D+ Terminal Analog Switch 3 D- Terminal Analog Switch 3 D+ Terminal Analog Switch 4 D+ Terminal Analog Switch 4 D- Terminal Analog Switch 5 D+ Terminal Analog Switch 5 D- Terminal Analog Switch 6 D+ Terminal Analog Switch 6 D- Terminal Analog Switch 7 D+ Terminal Analog Switch 7 D- Terminal Exposed Pad. Connect EP to GND or leave unconnected. FUNCTION
MAX4999
Detailed Description
The MAX4999 differential Hi-Speed USB analog multiplexer features low on-capacitance (CON) and low onresistance (R ON ) necessary for high-performance switching applications. The low CON is designed for USB server/mass storage devices. This device is ideal for USB 2.0 Hi-Speed applications at 480Mbps, while also meeting the requirements for USB low-/full-speed applications.
Enable Input (EN)
The MAX4999 features an enable input that when driven low, places the device in standby mode. In standby mode, all channels are high impedance and the internal charge pump is disabled, thus minimizing the quiescent supply current. For normal operation, drive EN high.
Analog Signal Levels
Signals applied to COM1 are routed to D_ _1 terminals. Signals applied to COM0 are routed to D_ _0 terminals. This multiplexer is bidirectional, allowing COM_ and D-/D+ terminals to be configured as either inputs or outputs. Additionally, the MAX4999 can be used for non-USB signals if the signals fall within the normal operating range. The MAX4999 features an internal charge pump that allows signal levels greater than the supply voltage. Limit the analog input/output signal level to no more than the Absolute Maximum Ratings.
7
Digital Control Inputs (C0, C1, C2)
The MAX4999 provides three digital control inputs (C0, C1, C2) to select the analog signal path between the COM_ and D-/D+ channels. The truth table for the MAX4999 is shown in the Functional Diagram/Truth Table. Driving the control inputs rail-to-rail minimizes power consumption.
_______________________________________________________________________________________
USB 2.0 Hi-Speed Differential 8:1 Multiplexer MAX4999
Functional Diagram/Truth Table
VCC
Applications Information
Increasing USB Channels
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). See the Eye Diagram Single graph in the Typical Operating Characteristics. Figure 5 shows two MAX4999 devices configured with the USB common terminal multiplexed to 16 USB channels (16:1). See the Eye Diagram - Double graph in the Typical Operating Characteristics. The MAX4999 was designed to be symmetrical so that the two common ports may be wired in parallel with very short wiring to create a 16:1 configuration. When operating in 16:1 configuration, interchange COM0 and COM1 on the second device to reverse the D+ and D- pins. This minimizes vias and crossovers (Figure 5).
MAX4999
COM1
MUX
D0 _1 D1 _1 D2 _1 D3 _1 D4 _1 D5 _1 D6 _1 D7 _1
COM0
MUX
D0 _0 D1 _0 D2 _0 D3 _0 D4 _0 D5 _0 D6 _0 D7 _0
USB Switching
The MAX4999 analog multiplexers are fully compliant with the USB 2.0 specification. The low on-resistance and low on-capacitance of the MAX4999 make it ideal for high-performance switching applications.
EN C0 C1 C2 CONTROL LOGIC CHARGE PUMP
Board Layout
Hi-Speed switches require proper layout and design procedures for optimum performance. Keep design-controlled impedance PCB traces as short as possible. Ensure that high-quality bypass ceramic capacitors (X7R, X5R or better) are placed as close to the device as possible and use large ground planes where possible.
GND
MAX4999 EN 1 1 1 1 1 1 1 1 C2 0 0 0 0 1 1 1 1 C1 0 0 1 1 0 0 1 1 C0 0 1 0 1 0 1 0 1 FUNCTION COM_D0 COM_D1 COM_D2 COM_D3 COM_D4 COM_D5 COM_D6 COM_D7 STANDBY MODE. ALL SWITCHES IN HIGHIMPEDANCE STATE. CHARGE PUMP IS OFF.
0
X
X
X
X = DON'T CARE
8
_______________________________________________________________________________________
USB 2.0 Hi-Speed Differential 8:1 Multiplexer MAX4999
USB4 +USB3 +-
D4_1
D4_0
D3_1 19 18
+ USB5 + + +3.3V
D5_1 D5_0 D6_1 D6_0 D7_1 D7_0 VCC
23 22 25 26 28 29
D3_0
16 15 13 12
D2_1 D2_0 D1_1 D1_0 D0_1 D0_0
+ USB2 + USB1 + USB0 -
USB6
MAX4999
31 32 10 9
USB7
2, 20 453678
1, 11, 14, 17, 21, 24, 27, 30 GND
EN C0 C1 C2 -+ COMMON
Figure 4. The MAX4999 Multiplexes Between Eight Differential Channels (8:1)
ONE PAIR SHOWN + D20 16 15 8 7 6 MAX4999 DEVICE 0 5 4 3 1 +
C2 C1 C0 EN0
EN1
+ 1 3 MAX4999 DEVICE 1
4 5 6 7 8
15
16
D20 USB TYPE A COMMON USB D+, D- MUST BE REVERSED IF DEVICES ARE CONNECTED AS SHOWN, THIS IS TRUE OF D0-D7. C0, C1, C2 ARE CONNECTED IN PARALLEL. EN0 AND EN1 ARE USED TO SELECT BETWEEN DEVICE 0 AND DEVICE 1. + -
Figure 5. Combining Two MAX4999 Devices for 16:1 USB Connections
_______________________________________________________________________________________ 9
USB 2.0 Hi-Speed Differential 8:1 Multiplexer MAX4999
Chip Information
PROCESS: CMOS
Package Information
For the latest package outline information, go to www.maxim-ic.com/packages. PACKAGE TYPE 32 TQFN-EP PACKAGE CODE T3255-4 DOCUMENT NO. 21-0140
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2008 Maxim Integrated Products
SPRINGER
is a registered trademark of Maxim Integrated Products, Inc.

▲Up To Search▲

Price & Availability of MAX4999ETJ

	To Download MAX4999ETJ Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .