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MAX9176EUB+T-MAX9177EUB+T
670MHz, LVDS-to-LVDS and Anything-to-LVDS, 2:1 Multiplexers
General DescriptionThe MAX9176/MAX9177 are 670MHz, low-jitter, low-
skew 2:1 multiplexers ideal for protection switching,
loopback, and clock distribution. The devices feature
ultra-low 68ps peak-to-peak deterministic jitter that
ensures reliable operation in high-speed links that are
highly sensitive to timing errors.
The MAX9176 has fail-safe LVDS inputs and an LVDS
output. The MAX9177 has “anything” differential inputs
(CML/LVDS/LVPECL) and an LVDS output. The output
can be put into high impedance using the power-down
input. The MAX9176 features fail-safe circuits that drive
the output high when a selected input is open, undriven
and shorted, or undriven and terminated. The MAX9177
has bias circuits that force the output high when a
selected input is open. The mux select and power-
down inputs are compatible with standard LVTTL/
LVCMOS logic.
The select and power-down inputs tolerate undershoot
of -1V and overshoot of VCC + 1V. The MAX9176/
MAX9177 are available in 10-pin µMAX and 10-lead
thin QFN packages, and operate from a single 3.3V
supply over the -40°C to +85°C temperature range.
ApplicationsProtection Switching
Loopback
Clock Distribution
Features1.0ps(RMS)Jitter (max) at 670MHz 68ps(P-P)Jitter at 800Mbps Data Rate3.3V SupplyLVDS Fail-Safe Inputs (MAX9176)Anything Inputs (MAX9177) Accept
CML/LVDS/LVPECLSelect and Power-Down Inputs Tolerate -1.0V
and VCC+ 1.0VLow-Power CMOS Design10-Lead µMAX and QFN Packages-40°C to +85°C Operating Temperature RangeConform to ANSI TIA/EIA-644 LVDS StandardIEC61000-4-2 Level 4 ESD Rating
MAX9176/MAX9177
670MHz LVDS-to-LVDS and
Anything-to-LVDS 2:1 MultiplexersOUT+
OUT-
VCCIN1+
GND
INO-
IN0+
MAX9176
μMAX
TOP VIEW
SELIN1-
OUT+
OUT-
VCCIN1+
GND
INO-
EXPOSED
PAD
IN0+
QFN
(LEADS UNDER PACKAGE) SELIN1-
PARTTEMP RANGEPIN-PACKAGE
MAX9176EUB-40°C to +85°C10 µMAX
MAX9176ETB*-40°C to +85°C10 Thin QFN-EP**
MAX9177EUB-40°C to +85°C10 µMAX
MAX9177ETB*-40°C to +85°C10 Thin QFN-EP**
Pin Configurations
Ordering Information19-2757; Rev 0; 1/03
Functional Diagram appears at end of data sheet.*Future product—contact factory for availability.
**EP = Exposed paddle.
MAX9176/MAX9177
670MHz LVDS-to-LVDS and
Anything-to-LVDS 2:1 Multiplexers
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(VCC= 3.0V to 3.6V, RL= 100Ω, PD= high, SEL = high or low, differential input voltage |VID|= 0.05V to 1.2V, MAX9176 input com-
mon-mode voltage VCM= |VID/2| to 2.4V - |VID/2|, MAX9177 input common-mode voltage VCM= |VID/2| to VCC- |VID/2|, TA= -40°C to
+85°C, unless otherwise noted. Typical values are at VCC= 3.3V, |VID|= 0.2V, VCM = 1.25V, TA= +25°C.) (Notes 1, 2, 3)
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.
VCCto GND...........................................................-0.3V to +4.0V
IN_+, IN_- to GND.................................................-0.3V to +4.0V
OUT+, OUT- to GND.............................................-0.3V to +4.0V
PD, SEL to GND.........................................-1.4V to (VCC+ 1.4V)
Single-Ended and Differential Output
Short-Circuit Duration (OUT+, OUT-)......................Continuous
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C)............444mW
10-Lead Thin QFN (derate 24.4mW/°C above +70°C)..1951mW
Operating Temperature Range...........................-40°C to +85°C
Maximum Junction Temperature.....................................+150°C
Storage Temperature Range.............................-65°C to +150°C
ESD Protection
Human Body Model (RD= 1.5kΩ, CS= 100pF)
(IN_+, IN_-, OUT+, OUT-)...............................................+16kV
IEC61000-4-2 Level 4 (RD= 330Ω, CS= 150pF)
Contact Discharge (IN_+, IN_-, OUT+, OUT-).................+8 kV
Air-Gap Discharge (IN_+, IN_-, OUT+, OUT-)................+15kV
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DIFFERENTIAL INPUTS (IN_+, IN_-)Differential Input High ThresholdVTH+50mV
Differential Input Low ThresholdVTL-50mV
Input CurrentIIN+, IIN-Figure 1-20+20µA
MAX9176VCC = 0 or open,
Figure 1
Power-Off Input CurrentIINO+,
IINO-
MAX9177
VIN+ = 3.6V or 0,
VIN- = 3.6V or 0,
VCC = 0 or open,
Figure 1
-20+20µA
RIN160108Fail-Safe Input Resistors
(MAX9176)RIN2
VCC = 3.6V, 0 or open,
Figure 1200394kΩ
Input Resistors
(MAX9177)RIN3VCC = 3.6V, 0 or open,
Figure 1212450kΩ
Input CapacitanceCININ_+ or IN_- to GND (Note 4)4.5pF
LVTTL/LVCMOS INPUTS (SEL, PD)Input High VoltageVIH2.0VCC + 1.0V
Input Low VoltageVIL-1.0+0.8V
-1.0V ≤ SEL, PD ≤ 0V-1.5mA
0V ≤ SEL, PD ≤ VCC-20+20µAInput CurrentIIN
VCC ≤ SEL, PD ≤ VCC + 1.0V+1.5mA
LVDS OUTPUT (OUT+, OUT-)Differential Output VoltageVODFigure 2250393475mV
Change in Differential Output
Voltage Between Logic StatesΔVODFigure 21.015mV
Offset VoltageVOSFigure 31.1251.251.375V
MAX9176/MAX9177
670MHz LVDS-to-LVDS and
Anything-to-LVDS 2:1 Multiplexers
DC ELECTRICAL CHARACTERISTICS (continued)(VCC= 3.0V to 3.6V, RL= 100Ω, PD= high, SEL = high or low, differential input voltage |VID|= 0.05V to 1.2V, MAX9176 input com-
mon-mode voltage VCM= |VID/2| to 2.4V - |VID/2|, MAX9177 input common-mode voltage VCM= |VID/2| to VCC- |VID/2|, TA= -40°C to
+85°C, unless otherwise noted. Typical values are at VCC= 3.3V, |VID|= 0.2V, VCM = 1.25V, TA= +25°C.) (Notes 1, 2, 3)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSChange in Offset Voltage
Between Logic StatesΔVOSFigure 3415mV
Fail-Safe Differential Output
Voltage (MAX9176)VODFigure 2250393475mV
Differential Output ResistanceRDIFFVCC = 3.6V or 095123146Ω
VOUT+ = open,
VOUT- = 3.6V or 0Power-Down Single-Ended
Output CurrentIPDPD = low
VOUT- = open,
VOUT+ = 3.6V or 0
-1.0±0.01+1.0µA
VOUT+ = open,
VOUT- = 3.6V or 0Power-Off Single-Ended Output
CurrentIOFFPD, SEL = low,
VCC = 0 or openVOUT- = open,
VOUT+ = 3.6V or 0
-1.0±0.01+1.0µA
VID = +50mV or -50mV, VOUT+ = 0 or VCCOutput Short-Circuit CurrentIOSVID = +50mV or -50mV, VOUT- = 0 or VCC-15+15mA
Differential Output Short-Circuit
Current MagnitudeIOSDVID = +50mV or -50mV, VOD = 0
(Note 4)15mA
Supply CurrentICCRL = 100Ω, PD = VCC, SEL = VCC or 02640mA
Power-Down Supply CurrentICCPDRL = 100Ω, PD = 0, other inputs open0.520µA
Output CapacitanceCOOUT+ or OUT- to GND (Note 4)5.2pF
MAX9176/MAX9177
670MHz LVDS-to-LVDS and
Anything-to-LVDS 2:1 Multiplexers
Note 1:Current into a pin is defined as positive. Current out of a pin is defined as negative. All voltages are referenced to ground
except VTH, VTL, VID, VOD, andΔVOD.
Note 2:Maximum and minimum limits over temperature are guaranteed by design and characterization. Devices are 100% tested
at TA= +25°C.
Note 3:Tolerance on all external resistors (including figures) is ±1%.
Note 4:Guaranteed by design and characterization.
Note 5:AC parameters are guaranteed by design and characterization and not production tested. Limits are set at ±6 sigma.
Note 6:CLincludes scope probe and test jig capacitance.
Note 7:Pulse-generator output for differential inputs IN_+, IN_- (unless otherwise noted): f = 670MHz, 50% duty cycle, RO= 50Ω,= 500ps, and tF= 500ps (0% to 100%). Pulse-generator output for single-ended inputs PD, SEL:tR = tF= 1.5ns (0.2VCC
to 0.8VCC), 50% duty cycle, VOH= VCC+ 1.0V settling to VCC, VOL = -1.0V settling to zero.
Note 8:Pulse-generator output for tDJ: VOD= 0.15V, VOS= 1.25V, bit rate = 800Mbps, 223- 1 PRBS, RO= 50Ω, tR= 500ps, and tF
= 500ps (0% to 100%).
Note 9:tSKPP1is the magnitude of the difference of any differential propagation delays between devices operating under identical
conditions.
Note 10:tSKPP2is the magnitude of the difference of any differential propagation delays between devices operating over rated
conditions.
Note 11:Meets all AC specifications.
Note 12:Input jitter subtracted from output jitter.
AC ELECTRICAL CHARACTERISTICS(VCC= 3.0V to 3.6V, RL= 100Ω, CL= 5pF, differential input voltage |VID|= 0.15V to 1.2V, MAX9176 input common-mode voltage
VCM= |VID/2| to 2.4V - |VID/2|, MAX9177 input common-mode voltage VCM= |VID/2| to VCC- |VID/2|, TA= -40°C to +85°C, unless oth-
erwise noted. Typical values are at VCC= 3.3V, |VID|= 0.2V, VCM= 1.25V, TA= +25°C.) (Notes 5, 6, 7)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DIFFERENTIAL INPUTS (IN_+, IN_-)High-to-Low Propagation DelaytPHLFigures 4, 51.332.463.23ns
Low-to-High Propagation DelaytPLHFigures 4, 51.332.493.31ns
Added Deterministic JittertDJFigures 4, 5 (Notes 8, 12)6880ps(P-P)
Added Random JittertRJFigures 4, 5 (Note 12)0.71.0ps(RMS)
Pulse Skew tPLH - tPHLtSKPFigures 4, 527142ps
tSKPP1Figures 4, 5 (Note 9)0.41.3Part-to-Part SkewtSKPP2Figures 4, 5 (Note 10)2.0ns
Rise TimetRFigures 4, 5217320383ps
Fall TimetFFigures 4, 5157340360ps
Select to Out DelaytPSOFigure 62.02.7ns
Power-Down TimetPDFigures 7, 86.0ns
Power-Up TimetPUFigures 7, 835µs
Maximum Data RateDRMAXFigures 4, 5, VOD ≥ 250mV (Note 11)800Mbps
Maximum Switching FrequencyfMAXFigures 4, 5, VOD ≥ 250mV (Note 11)670MHz
fIN = 670MHz3858Switching Supply CurrentICCSWfIN = 155MHz2647mA
PRBS Supply CurrentICCPRDR = 800Mbps, 223 - 1 PRBS input2749mA
MAX9176/MAX9177
670MHz LVDS-to-LVDS and
Anything-to-LVDS 2:1 MultiplexersVCC
VCC
0.3V
IN_+
RIN1
RIN2
RIN3
RIN3
RIN1
IN_-
IN_+
IN_-
TO MUXTO MUX
MAX9176 FAIL-SAFE INPUTMAX9177 INPUT
VCC
COMPARATOR
LVDS RCVR
5kΩ
5kΩ
VTEST =
0 TO VCC
IN_-
IN_+OUT+
OUT-
RL VOD
1.25V
1.20V
1.25V
1.20V
Figure 1. Input Structure
Figure 2. VODTest Circuit
5kΩ
50Ω50Ω
5kΩ
VTEST =
0 TO VCCIN_-
IN_+
PULSE
GENERATOR
OUT+
OUT-
CL CL
RL
Figure 4. Transition Time and Propagation Delay Test Circuit
VOS
IN_-
IN_+
OUT+
OUT-
RL/2
RL/2
1.25V
1.20V
1.25V
1.20V
Figure 3. VOSTest Circuit
tPLH
OUT+
OUT-
VOS = ((VOUT+) + (VOUT-))/2tF
tPHL
(OUT+) - (OUT)-20%VOD-
VOD+80%80%
20%0
IN_+
IN_-
Figure 5. Transition Time and Propagation Delay Timing
MAX9176/MAX9177
670MHz LVDS-to-LVDS and
Anything-to-LVDS 2:1 MultiplexerstPSO
OUT+
OUT-
SEL
tPSO
0.5 VCC
VCC + 1.0V
VCC
-1.0V
0.5 VCC
VID = +0.2V
IN1-
IN1+
VID = -0.2V
INO+
IN0-
GND
OUT+1.25V
1.20V
1.25V
1.20V
IN_+
IN_-
5pF
5pF
50Ω
1.25V
50Ω
OUT-
OUT+
VCC
GENERATOROUT-
50Ω
MAX9176
MAX9177
Figure 6. Select-to-Out Delay TimingFigure 7. Power-Up/Down Delay Test Circuit
Figure 8. Power-Up/Down Delay Waveform
tPU
1.0V + VCC
0.5VCC
-1.0V
VOH
1.25V
1.25V
VOL
50%
50%50%
50%
VCC
tPD
tPDtPU
OUT+ WHEN VID = +50mV
OUT- WHEN VID = -50mV
OUT+ WHEN VID = -50mV
OUT- WHEN VID = +50mV
MAX9176/MAX9177
670MHz LVDS-to-LVDS and
Anything-to-LVDS 2:1 Multiplexers
SUPPLY CURRENT
vs. TEMPERATUREMAX9176 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)3510-15
fIN = 155MHz
DIFFERENTIAL OUTPUT VOLTAGE
vs. FREQUENCYMAX9176 toc02
FREQUENCY (MHz)
DIFFERENTIAL OUTPUT VOLTAGE (mV)
OUTPUT RISE/FALL TIME
vs. TEMPERATURE
MAX9176 toc03
TEMPERATURE (°C)
RISE/FALL TIME (ps)3510-15
fIN = 155MHz
DIFFERENTIAL PROPAGATION DELAY
vs. TEMPERATUREMAX9176 toc04
TEMPERATURE (°C)
DIFFERENTIAL PROPAGATION DELAY (ns)3510-15
tPHL
tPLH
SUPPLY CURRENT
vs. FREQUENCYMAX9176 toc05
FREQUENCY (MHz)
SUPPLY CURRENT (mA)
SUPPLY CURRENT
vs. DATA RATE
MAX9176 toc06
FREQUENCY (Mbps)
SUPPLY CURRENT (mA)
PRBS 223 - 1
DC SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9176 toc07
SUPPLY VOLTAGE (V)
DC SUPPLY CURRENT (mA)
OUTPUT RISE/FALL TIME
vs. SUPPLY VOLTAGE
MAX9176 toc08
SUPPLY VOLTAGE (V)
OUTPUT RISE/FALL TIME (ps)tR
fIN = 155MHz
DIFFERENTIAL PROPAGATION DELAY
vs. SUPPLY VOLTAGE
MAX9176 toc09
SUPPLY VOLTAGE (V)
DIFFERENTIAL PROPAGATION DELAY (ns)
tPLH
tPHL
fIN = 155MHz
Typical Operating Characteristics((MAX9176) VCC= 3.3V, |VID|= 0.2V, VCM= 1.25V, RL= 100Ω, CL= 5pf, PD= VCC, SEL = 0V, IN1+, IN1- = open, TA= +25°C,
unless otherwise noted.)
