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19-5252; Rev 0; 4/10
High-Bandwidth, 15kV ESD Protection LVDS Switch
General Description
The MAX14979E is optimized for high-speed differential switching applications. The device is ideal for low-voltage differential signal (LVDS) and low-voltage positive emitter-coupled logic (LVPECL) switching applications. The MAX14979E provides enhanced electrostatic discharge (ESD) protection up to Q15kV and excellent highfrequency response, making this device especially useful for interfaces that must go to an outside connection. The MAX14979E provides extremely low capacitance (CON) as well as low resistance (RON) for low-insertion loss and bandwidth up to 650MHz (1.3Gbps). In addition to the four pairs of double-pole/double-throw (DPDT) switches, the MAX14979E provides low-frequency (up to 50MHz) and AUX switching that can be used for LED lighting or other applications. The MAX14979E is available in a space-saving 36-pin TQFN package and operates over the standard -40NC to +85NC temperature range. 3015
S Single +3.0V to +3.6V Power-Supply Voltage S Low On-Resistance (RON): 4I (typ), 6.5I (max) S Low On-Capacitance (CON): 8pF (typ) S -23dB Return Loss (100MHz) S -3dB Bandwidth: 650MHz S Built-In AUX Switches for Switching Indicators S Low 450A (max) Quiescent Current S Bidirectional 8 to 16 Multiplexer/Demultiplexer S Space-Saving, Lead-Free, 36-Pin, 6mm x 6mm
Features
S 15kV ESD Protected per MIL-STD-883, Method
MAX14979E
TQFN Package
Eye Diagram
Applications
Notebook Computers Switch LVDS to Graphics Panels LVDS and LVPECL Switching
100mV/div
Ordering Information
PART MAX14979EETX+ TEMP RANGE -40NC to +85NC PIN-PACKAGE 36 TQFN-EP*
f = 300MHz 500ps/div
+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
Typical Operating Circuit appears at end of data sheet.
_______________________________________________________________ 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.
High-Bandwidth, 15kV ESD Protection LVDS Switch MAX14979E
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND.) V+ .........................................................................-0.3V to +4.0V All Other Pins...............................................-0.3V to (V+ + 0.3V) Continuous Current (COM_ _ to NC_ _/NO_ _) ............ Q120mA Continuous Current (AUX0_ to AUX1_/AUX2_)............... Q40mA Peak Current (COM_ _ to NC_ _/NO_ _) (pulsed at 1ms, 10% duty cycle) ............................... Q240mA Current into Any Other Pin .............................................. Q20mA Continuous Power Dissipation (TA = +70NC) 36-Pin TQFN (derate 35.7mW/NC above +70NC) .......2.85mW ESD Protection, Human Body Model (HBM) ....................Q15kV Junction-to-Ambient Thermal Resistance BJA (Note 1) ...................................................................8NC/W Junction-to-Case Thermal Resistance BJC (Note 1) ...................................................................1NC/W Operating Temperature Range ........................ -40NC to +85NC Junction Temperature .................................................. +150NC Storage Temperature Range ......................... -65NC to +150NC Lead Temperature (soldering 10s) ................................+300NC Soldering Temperature (reflow) ......................................+260NC
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer 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
(V+ = +3.0V to +3.6V, TA = TJ = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = +3.3V, TA = +25NC.) (Note 2) PARAMETER POWER SUPPLIES Operating Power-Supply Range ANALOG SWITCH On-Resistance On-Resistance AUX Switches On-Resistance Match Between Channels On-Resistance Flatness Off-Leakage Current On-Leakage Current SWITCH AC PERFORMANCE Insertion Loss Return Loss Crosstalk SWITCH AC CHARACTERISTICS -3dB Bandwidth Off-Capacitance On-Capacitance 2 BW COFF CON RS = RL = 50I, unbalanced f = 1MHz, COM_ _ f = 1MHz, COM_ _ 650 3.5 8 MHz pF pF ILOS RLOS VCT1 VCT2 RS = RL = 50I, unbalanced, f = 1MHz, (Note 3) f = 100MHz Any switch to any switch; RS = RL = 50I, unbalanced, Figure 1 f = 25MHz f = 125MHz 0.6 -23 -50 -26 dB dB dB RON RONAUX DRON RFLAT(ON) ILCOM_
_(OFF)
SYMBOL VCC
CONDITIONS
MIN +3.0
TYP
MAX +3.6
UNITS V
V+ = 3V, ICOM_ _ = -40mA, VCOM_ _ = 0V, 1.5V, 3V
TA = +25NC TMIN to TMAX
4
5.5 6.5 40
I I I I
V+ = 3V, IAUX0_ = -40mA, VAUX0_ = 0V, 1.5V, 3V V+ = 3V, ICOM_ _ = -40mA, VCOM_ _ = 0V, 3V (Note 3) V+ = 3V, ICOM_ _ = -40mA, VCOM_ _ = 0V, 1.5V V+ = 3.6V, VCOM_ _ = 0.3V, 3.3V; VNC_ _ or VNO_ _ = 3.3V, 0.3V V+ = 3.6V, VCOM_ _ = 0.3V, 3.3V; VNC_ _ or VNO_ _ = 3.3V, 0.3V or unconnected -1 -1 TA = +25NC TMIN to TMAX 0.01 0.5
1.5 2
+1 +1
FA FA
ILCOM_
_(ON)
High-Bandwidth, 15kV ESD Protection LVDS Switch
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +3.0V to +3.6V, TA = TJ = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = +3.3V, TA = +25NC.) (Note 2) PARAMETER Turn-On Time Turn-Off Time Propagation Delay Output Skew Between Ports SWITCH LOGIC Input-Voltage Low Input-Voltage High Input-Logic Hysteresis Input Leakage Current Quiescent Supply Current ESD PROTECTION ESD Protection All Other Pins COM_ _, NC_ _, NO_ _ HBM (spec MIL-STD-883, Method 3015) HBM (spec MIL-STD-883, Method 3015) Q15 Q2 kV kV VIL VIH VHYST ISEL I+ V+ = 3.0V V+ = 3.6V V+ = 3.3V V+ = 3.6V, VSEL = 0V or V+ V+ = 3.6V, VSEL = 0V or V+ -5 280 2.0 100 +5 450 0.8 V V mV FA FA SYMBOL tON tOFF tPLH, tPHL tSK(o) CONDITIONS VCOM_ _ = 1V, RL = 100I, Figure 2 VCOM_ _ = 1V, RL = 100I, Figure 2 RS = RL = 50I, unbalanced, Figure 3 Skew between any two ports, Figure 4 0.1 0.01 MIN TYP MAX 50 50 UNITS ns ns ns ns
MAX14979E
Note 2: Specifications at TA = -40NC are guaranteed by design. Note 3: Guaranteed by design.
MAX14979E SINGLE-ENDED BANDWIDTH NETWORK ANALYZER 50 TRACE COM0+ 36 NC0+ 31
50 TRACE
NETWORK ANALYZER
SINGLE-ENDED CROSSTALK NETWORK ANALYZER 50 TRACE
COM1+ 2
NC1+ 26
R13 49.9
NETWORK ANALYZER
50 TRACE
COM13
NC125
R14 49.9
SINGLE-ENDED OFF-ISOLATION NETWORK ANALYZER 50 TRACE R15 49.9
COM2+ 7
NC2+ 22
50 TRACE
NETWORK ANALYZER
Figure 1. Single-Ended Bandwidth, Crosstalk, and Off-Isolation 3
High-Bandwidth, 15kV ESD Protection LVDS Switch MAX14979E
SEL 50% 50% VIL NC_ _ 50% 50% tOFF tON NO_ _ 50% 50% 0V NC_ _ NO_ _ VH 2.0V VL COM_ _ VIH 3.0V 2.0V 1.0V
tON
tPLH
tPHL
tOFF
PULSE SKEW = tSK(o) = |tPHL - tPLH|
0V
THE MAX14979E SWITCHES ARE FULLY BIDIRECTIONAL.
Figure 2. Turn-On and Turn-Off Times
Figure 3. Propagation Delay Times
3.0V 2.0V COM_ _ 1.0V tPLH tPHL VOH NC_ _ NO_ _ tPLH tPHL VOH NC_ _ NO_ _ 2.0V VOL 2.0V VOL
OUTPUT SKEW = tSK = |tPLH - tPLH| OR |tPHL - tPHL| THE MAX14979E SWITCHES ARE FULLY BIDIRECTIONAL.
Figure 4. Output Skew
4
High-Bandwidth, 15kV ESD Protection LVDS Switch
Typical Operating Characteristics
(V+ = 3.3V, TA = +25NC, unless otherwise noted.)
ON-RESISTANCE vs. VCOM_ _
MAX14979E toc01
MAX14979E
AUX_ ON-RESISTANCE vs. VAUX_
MAX14979E toc02
LEAKAGE CURRENT vs. TEMPERATURE
36 32 LEAKAGE CURRENT (pA) 28 24 20 16 12 8 4 0 IL (OFF) IL (ON)
MAX14979E toc03
6 5 4 RON () 3 2 1 0 0 0.5 1.0 1.5 VCOM_ _ (V) 2.0 2.5 TA = +85C TA = +25C TA = -40C
24 22 20 18 16 RONLED () 14 12 10 8 6 4 2 0 TA = -40C TA = +25C TA = +85C
40
3.0
0
0.5
1.0
1.5 VAUX_ (V)
2.0
2.5
3.0
-40
-15
10
35
60
85
TEMPERATURE (C)
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
340 QUIESCENT SUPPLY CURRENT (A) 320 300 280 260 240 220 200 -40 -15 10 35 60 85 TEMPERATURE (C) V+ = 3.6V
MAX14979E toc04
SINGLE-ENDED INSERTION LOSS vs. FREQUENCY
-1 INSERTION LOSS (dB) -2 -3 -4 -5 -6 -7 -8 1 10 100 1000 FREQUENCY (MHz)
MAX14979E toc05
0
5
High-Bandwidth, 15kV ESD Protection LVDS Switch MAX14979E
Pin Configuration
NC1+ NO1+ NC2+ NO2+
20
NC1-
NO1-
NC221
27
26
25
24
23
22
NO0NO0+ NC0NC0+ AUX2 AUX1 AUX0 V+ COM0+
19
NO2-
SEL
TOP VIEW
28 29 30 31 32 33 34 35 36
18 17 16 15
NC3+ NC3NO3+ NO3AUX2A AUX1A AUX0B GND COM3-
MAX14979E
14 13 12
+
1 2 3 4 5 6 7
EP
11 10
8
COM1+
AUX0A
COM0-
COM1-
AUX1B
AUX2B
COM2+
COM2-
TQFN (6mm x 6mm)
COM3+
9
Pin Description
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 NAME COM0COM1+ COM1AUX0A AUX1B AUX2B COM2+ COM2COM3+ COM3GND AUX0B AUX1A AUX2A NO3NO3+ NC3NC3+ NO2NO2+ NC2FUNCTION Common LVDS Differential Terminal for Switch 0 Common LVDS Differential Terminal for Switch 1 Common LVDS Differential Terminal for Switch 1 AUX0A Input AUX1B Output. Drive SEL low (SEL = 0) to connect AUX0A to AUX1B. AUX2B Output. Drive SEL high (SEL = 1) to connect AUX0A to AUX2B. Common LVDS Differential Terminal for Switch 2 Common LVDS Differential Terminal for Switch 2 Common LVDS Differential Terminal for Switch 3 Common LVDS Differential Terminal for Switch 3 Ground AUX0B Input AUX1A Output. Drive SEL low (SEL = 0) to connect AUX0B to AUX1A. AUX2A Output. Drive SEL high (SEL = 1) to connect AUX0B to AUX2A. Normally Open LVDS Differential Terminal for Switch 3 Normally Open LVDS Differential Terminal for Switch 3 Normally Closed LVDS Differential Terminal for Switch 3 Normally Closed LVDS Differential Terminal for Switch 3 Normally Open LVDS Differential Terminal for Switch 2 Normally Open LVDS Differential Terminal for Switch 2 Normally Closed LVDS Differential Terminal for Switch 2
6
High-Bandwidth, 15kV ESD Protection LVDS Switch
Pin Description (continued)
PIN 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 -- NAME NC2+ NO1NO1+ NC1NC1+ SEL NO0NO0+ NC0NC0+ AUX2 AUX1 AUX0 V+ COM0+ EP FUNCTION Normally Closed LVDS Differential Terminal for Switch 2 Normally Open LVDS Differential Terminal for Switch 1 Normally Open LVDS Differential Terminal for Switch 1 Normally Closed LVDS Differential Terminal for Switch 1 Normally Closed LVDS Differential Terminal for Switch 1 Select Input. SEL selects switch connection. See Table1. Normally Open LVDS Differential Terminal for Switch 0 Normally Open LVDS Differential Terminal for Switch 0 Normally Closed LVDS Differential Terminal for Switch 0 Normally Closed LVDS Differential Terminal for Switch 0 AUX2 Output. Drive SEL high (SEL = 1) to connect AUX0 to AUX2. AUX1 Output. Drive SEL low (SEL = 0) to connect AUX0 to AUX1. AUX0 Input Positive-Supply Voltage Input. Bypass V+ to GND with a 0.1FF ceramic capacitor. Common LVDS Differential Terminal for Switch 0 Exposed Pad. Connect exposed pad to GND or leave it unconnected.
MAX14979E
Detailed Description
The MAX14979E is a high-speed analog switch targeted at LVDS and other low-voltage switching up to 600MHz. In a typical application, the MAX14979E switches two sets of LVDS sources to a laptop LVDS panel. For extra security, the MAX14979E is protected against Q15kV ESD shocks. See the Functional Diagram. With its low resistance and capacitance, as well as highESD protection, the MAX14979E can be used to switch most low-voltage differential signals, such as LVDS and LVPECL, as long as the signals do not exceed the maximum ratings of the device. The MAX14979E switches provide low capacitance and on-resistance to meet low insertion loss and return-loss specifications. The MAX14979E has three additional AUX switches. The MAX14979E provides a single digital control SEL. SEL controls the switches as well as the AUX switches, as shown in Table 1. The on-resistance of the MAX14979E is very low and stable as the analog input signals are swept from ground to V+ (see the Typical Operating Characteristics). The
switches are bidirectional, allowing COM_ _ and NC_ _/ NO_ _ to be configured as either inputs or outputs.
ESD Protection
The MAX14979E is characterized using the HBM for Q15kV of ESD protection. Figure 5 shows the HBM. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kI resistor. All signal and control pins are ESD protected to Q15kV HBM.
RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST
Digital Control Inputs
Cs 100pF
STORAGE CAPACITOR
Analog-Signal Levels
Figure 5. Human Body ESD Test Model (MIL-STD-883, Method 3015)
7
High-Bandwidth, 15kV ESD Protection LVDS Switch MAX14979E
Functional Diagram Applications Information
The Typical Operating Circuit shows the MAX14979E in a dual graphics application.
Typical Operating Circuit
COM0+ COM0-
NC0+ NC0NO0+ NO0-
COM1+ COM1-
NC1+ NC1NO1+ NO1-
Caution: Do not exceed the absolute maximum ratings. Stresses beyond the listed ratings may cause permanent damage to the device. Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+ before applying analog signals, especially if the analog signal is not current limited. High-speed switches require proper layout and design procedures for optimum performance. Keep designcontrolled-impedance PCB traces as short as possible. Ensure that bypass capacitors are as close as possible to the device. Use large ground planes where possible.
Power-Supply Sequencing and Overvoltage Protection
COM2+ COM2-
NC2+ NC2NO2+ NO2-
Layout
COM3+ COM3-
NC3+ NC3NO3+ NO3-
Chip Information
PROCESS: BiCMOS
AUX0A AUX0B AUX0
AUX1A AUX2A AUX1B AUX2B AUX1 AUX2
Package Information
For the latest package outline information and land patterns, 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 36 TQFN-EP PACKAGE CODE T3666+3 DOCUMENT NO. 21-0141
SEL
MAX14979E
Table 1. Truth Table
SEL 0 1 CONNECTION COM_ _ to NC_ _, AUX0_ to AUX1_ COM_ _ to NO_ _, AUX0_ to AUX2_
8
High-Bandwidth, 15kV ESD Protection LVDS Switch
Typical Operating Circuit
MAX14979E LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_INTERNAL GRAPHICS
MAX14979E
NO0+ NO0NO1+ NO1NO2+ NO2NO3+ NO3-
COM0+ COM0-
COM1+ COM1COM2+ COM2-
LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_-
NC0+ NC0NC1+ NC1NC2+ NC2NC3+ NC3SEL
COM3+ COM3-
CONTROL
LVDS LCD PANEL
MAX14979E LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_NO0+ NO0NO1+ NO1NO2+ NO2NO3+ NO3-
COM0+ COM0-
COM1+ COM1COM2+ COM2-
SVDO TO LVDS
LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_-
NC0+ NC0NC1+ NC1NC2+ NC2NC3+ NC3SEL
COM3+ COM3-
CONTROL
NOTE: THE MAX14979E HAS THREE SPDT AUXILLIARY SWITCHES (AUX) THAT CAN BE USED FOR OTHER SWITCHING SUCH AS LEDs AND I2C. THESE ARE NOT SHOWN IN THE DIAGRAM.
9
High-Bandwidth, 15kV ESD Protection LVDS Switch MAX14979E
Revision History
REVISION NUMBER 0 REVISION DATE 4/10 Initial release DESCRIPTION PAGES CHANGED --
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
(c)
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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