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MAX14979E

High-Bandwidth, ±15kV ESD Protection

LVDS Switch

19-5252; Rev 1; 6/11

Typical Operating Circuit appears at end of data sheet.

General Description

The MAX14979E is optimized for high-speed differential

switching applications. The device is ideal for low-volt-

age differential signal (LVDS) and low-voltage positive

emitter-coupled logic (LVPECL) switching applications.

The MAX14979E provides enhanced electrostatic dis-

charge (ESD) protection up to Q15kV and excellent high-

frequency response, making this device especially use-

ful for interfaces that must go to an outside connection.

The MAX14979E provides extremely low capacitance

) as well as low resistance (R

) for low-insertion

loss and bandwidth up to 650MHz (1.3Gbps). In addi-

tion 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.

Applications

Notebook Computers

Switch LVDS to Graphics Panels

LVDS and LVPECL Switching

Ordering Information

Features

S ±15kV ESD Protected per MIL-STD-883, Method

3015

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

S Low On-Resistance (R

): 4I (typ), 6.5I (max)

S Low On-Capacitance (C

): 8pF (typ)

S -23dB Return Loss (100MHz)

S -3dB Bandwidth: 650MHz

S Built-In AUX Switches for Switching Indicators

S Low 450µA (max) Quiescent Current

S Bidirectional 8 to 16 Multiplexer/Demultiplexer

S Space-Saving, Lead-Free, 36-Pin, 6mm x 6mm

TQFN Package

Eye Diagram

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

*EP = Exposed pad.

500ps/div

100mV/div

f = 300MHz

PART TEMP RANGE PIN-PACKAGE

MAX14979EETX+

-40NC to +85NC

36 TQFN-EP*

Summary of content (10 pages)

PAGE 1
9-5252; Rev 1; 6/11 High-Bandwidth, ±15kV ESD Protection LVDS Switch 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.
PAGE 2
MAX14979E High-Bandwidth, ±15kV ESD Protection LVDS Switch 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)............................
PAGE 3
High-Bandwidth, ±15kV ESD Protection LVDS Switch MAX14979E 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 SYMBOL CONDITIONS MIN TYP MAX UNITS Turn-On Time tON VCOM_ _ = 1V, RL = 100I, Figure 2 50 ns Turn-Off Time tOFF VCOM_ _ = 1V, RL = 100I, Figure 2 50 ns Propagation Delay Output Skew Between Ports tPLH, tPHL RS = RL = 50I, unbalanced, Figure 3 0.
PAGE 4
MAX14979E High-Bandwidth, ±15kV ESD Protection LVDS Switch SEL VIH 50% 3.0V 50% 2.0V VIL COM_ _ NC_ _ tON 1.0V tPLH tPHL 50% 50% tOFF tOFF VH 0V 2.0V NC_ _ NO_ _ tON NO_ _ 50% 50% VL PULSE SKEW = tSK(o) = |tPHL - tPLH| THE MAX14979E SWITCHES ARE FULLY BIDIRECTIONAL. 0V Figure 2. Turn-On and Turn-Off Times Figure 3. Propagation Delay Times 3.0V 2.0V COM_ _ 1.0V tPLH tPHL VOH 2.0V NC_ _ NO_ _ VOL tPLH tPHL VOH NC_ _ NO_ _ 2.
PAGE 5
High-Bandwidth, ±15kV ESD Protection LVDS Switch TA = -40°C 14 12 2 1 6 4 TA = +25°C TA = -40°C 36 32 1.0 1.5 2.0 2.5 20 16 12 0 0 3.0 0.5 IL(OFF) 1.0 1.5 2.0 2.5 3.0 -40 60 85 300 280 260 -1 -2 -3 -4 -5 240 -6 220 -7 200 MAX14979E toc05 0 INSERTION LOSS (dB) 320 35 SINGLE-ENDED INSERTION LOSS vs. FREQUENCY MAX14979E toc04 V+ = 3.6V 10 TEMPERATURE (°C) QUIESCENT SUPPLY CURRENT vs. TEMPERATURE 340 IL(ON) -15 VAUX_ (V) VCOM_ _ (V) QUIESCENT SUPPLY CURRENT (µA) 0.
PAGE 6
High-Bandwidth, ±15kV ESD Protection LVDS Switch SEL NC1+ NC1- NO1+ NO1- NC2+ NC2- NO2+ NO2- 27 26 25 24 23 22 21 20 19 TOP VIEW NO0- 28 18 NC3+ NO0+ 29 17 NC3- NC0- 30 16 NO3+ NC0+ 31 15 NO3- AUX2 32 14 AUX2B AUX1 33 13 AUX1B AUX0 34 12 AUX0B V+ 35 11 GND COM0+ 36 10 COM3- MAX14979E *EP 1 2 3 4 5 6 7 8 9 COM0- COM1- AUX0A AUX1A AUX2A COM2+ COM2- COM3+ + COM1+ MAX14979E Pin Configuration TQFN *CONNECT EP TO GND.
PAGE 7
High-Bandwidth, ±15kV ESD Protection LVDS Switch PIN NAME 22 NC2+ Normally Closed LVDS Differential Terminal for Switch 2 23 NO1- Normally Open LVDS Differential Terminal for Switch 1 24 NO1+ Normally Open LVDS Differential Terminal for Switch 1 25 NC1- Normally Closed LVDS Differential Terminal for Switch 1 26 NC1+ Normally Closed LVDS Differential Terminal for Switch 1 27 SEL Select Input. SEL selects switch connection. See Table1.
PAGE 8
MAX14979E High-Bandwidth, ±15kV ESD Protection LVDS Switch Applications Information Functional Diagram Typical Operating Circuit COM0+ NC0+ COM0- NC0NO0+ NO0- COM1+ NC1+ COM1- NC1NO1+ NO1- COM2+ NC2+ COM2- NC2NO2+ NO2- COM3+ NC3+ COM3- NC3- The Typical Operating Circuit shows the MAX14979E in a dual graphics application. Power-Supply Sequencing and Overvoltage Protection Caution: Do not exceed the absolute maximum ratings.
PAGE 9
High-Bandwidth, ±15kV ESD Protection LVDS Switch MAX14979E LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_- NO0+ NO0NO1+ NO1NO2+ NO2NO3+ NO3- COM0+ COM0- COM1+ COM1- INTERNAL GRAPHICS LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_- COM2+ COM2- NC0+ NC0NC1+ NC1NC2+ NC2NC3+ NC3- COM3+ COM3- SEL CONTROL LVDS LCD PANEL MAX14979E LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_- NO0+ NO0NO1+ NO1NO2+ NO2NO3+ NO3- COM0+ COM0- COM1+ COM1- SVDO TO LVDS LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CL
PAGE 10
MAX14979E High-Bandwidth, ±15kV ESD Protection LVDS Switch Revision History REVISION NUMBER REVISION DATE 0 4/10 Initial release 6/11 Updated Package Thermal Characteristics style; corrected Pin Configuration and Pin Description for AUX1_ and AUX2_ pins 1 DESCRIPTION PAGES CHANGED — 2, 6 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.