MAXIM MAX9176, MAX9177 User Manual

General Description

The MAX9176/MAX9177 are 670MHz, low-jitter, low­skew 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 power­down inputs are compatible with standard LVTTL/
LVCMOS logic.

The select and power-down inputs tolerate undershoot
of -1V and overshoot of V

CC

+ 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.

Applications

Protection Switching

Loopback

Clock Distribution

Features

♦ 1.0ps

(RMS)

Jitter (max) at 670MHz

♦ 68ps

(P-P)

Jitter at 800Mbps Data Rate

♦ 3.3V Supply

♦ LVDS Fail-Safe Inputs (MAX9176)

♦ Anything Inputs (MAX9177) Accept

CML/LVDS/LVPECL

♦ Select and Power-Down Inputs Tolerate -1.0V

and V

CC

+ 1.0V

♦ Low-Power CMOS Design

♦ 10-Lead µMAX and QFN Packages

♦ -40°C to +85°C Operating Temperature Range

♦ Conform to ANSI TIA/EIA-644 LVDS Standard

♦ IEC61000-4-2 Level 4 ESD Rating

MAX9176/MAX9177

670MHz LVDS-to-LVDS and

Anything-to-LVDS 2:1 Multiplexers

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

Ordering Information

19-2757; Rev 0; 1/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Functional Diagram appears at end of data sheet.

*Future product—contact factory for availability.
**EP = Exposed paddle.

PART TEMP RANGE PIN-PACKAGE

MAX9176EUB -40°C to +85°C 10 µMAX

MAX9176ETB* -40°C to +85°C 10 Thin QFN-EP**
MAX9177EUB -40°C to +85°C 10 µMAX
MAX9177ETB* -40°C to +85°C 10 Thin QFN-EP**

TOP VIEW

1

1

IN0+

2

INO-

GND

MAX9176

3

4

5

µMAX

10

OUT+

9

OUT-

8

V

CC

7

PDIN1+

SELIN1-

6

IN0+

2

INO-

3

GND

4

5

(LEADS UNDER PACKAGE)

EXPOSED
PAD

QFN

10

OUT+

9

OUT-

8

V

CC

7

PDIN1+

SELIN1-

6

MAX9176/MAX9177

670MHz LVDS-to-LVDS and
Anything-to-LVDS 2:1 Multiplexers

2 _______________________________________________________________________________________

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 com­mon-mode voltage V

CM

= |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 V

CC

= 3.3V, |VID| = 0.2V, V

CM

= 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 (V

CC

+ 1.4V)

Single-Ended and Differential Output

Short-Circuit Duration (OUT+, OUT-) ......................Continuous

Continuous Power Dissipation (T

A

= +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 (R

D

= 1.5kΩ, CS= 100pF)

(IN_+, IN_-, OUT+, OUT-) ...............................................+

16kV

IEC61000-4-2 Level 4 (R

D

= 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

DIFFERENTIAL INPUTS (IN_+, IN_-)

Differential Input High Threshold V

Differential Input Low Threshold V

Input Current I

Power-Off Input Current

Fail-Safe Input Resistors
(MAX9176)

Input Resistors
(MAX9177)

Input Capacitance C

LVTTL/LVCMOS INPUTS (SEL, PD)

Input High Voltage V

Input Low Voltage V

LVDS OUTPUT (OUT+, OUT-)

Differential Output Voltage V

Change in Differential Output
Voltage Between Logic States

Offset Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TH

TL

IN+, IIN-

I

INO+,

I

INO-

R

IN1

R

IN2

R

IN3

IN

IH

IL

IN

OD

∆V

OD

OS

Figure 1 -20 +20 µA

MAX9176

MAX9177

V
Figure 1

V
Figure 1

IN_+ or IN_- to GND (Note 4) 4.5 pF

-1.0V ≤ SEL, PD ≤ 0V -1.5 mA
0V ≤ SEL, PD ≤ V

VCC ≤ SEL, PD ≤ VCC + 1.0V +1.5 mA

Figure 2 250 393 475 mV

Figure 2 1.0 15 mV

Figure 3 1.125 1.25 1.375 V

= 3.6V, 0 or open,

CC

= 3.6V, 0 or open,

CC

+50 mV

-50 mV

V

= 0 or open,

CC

Figure 1

= 3.6V or 0,

V

CC

IN+

V

= 3.6V or 0,

IN-

= 0 or open,

V

CC

Figure 1

-20 +20 µA

60 108

200 394

212 450 kΩ

2.0 VCC + 1.0 V

-1.0 +0.8 V

-20 +20 µAInput Current I

kΩ

MAX9176/MAX9177

670MHz LVDS-to-LVDS and

Anything-to-LVDS 2:1 Multiplexers

_______________________________________________________________________________________ 3

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 com­mon-mode voltage V

CM

= |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 V

CC

= 3.3V, |VID| = 0.2V, V

CM

= 1.25V, TA= +25°C.) (Notes 1, 2, 3)

Change in Offset Voltage
Between Logic States

Fail-Safe Differential Output
Voltage (MAX9176)

Differential Output Resistance R

Power-Down Single-Ended
Output Current

Power-Off Single-Ended Output
Current

Output Short-Circuit Current I

Differential Output Short-Circuit
Current Magnitude

Supply Current I

Power-Down Supply Current I

Output Capacitance C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

∆V

OS

V

OD

DIFF

I

PD

I

OFF

OS

I

OSD

CC

CCPD

O

Figure 3 4 15 mV

Figure 2 250 393 475 mV

VCC = 3.6V or 0 95 123 146 Ω

PD = low

PD, SEL = low,

V

VID = +50mV or -50mV, V

VID = +50mV or -50mV, V

VID = +50mV or -50mV, VOD = 0
(Note 4)

RL = 100Ω, PD = VCC, SEL = VCC or 0 26 40 mA

RL = 100Ω, PD = 0, other inputs open 0.5 20 µA

OUT+ or OUT- to GND (Note 4) 5.2 pF

= 0 or open

CC

V

OUT+ =

V

OUT- =

V

OUT- =

V

OUT+ =

V

OUT+ =

V

OUT- =

V

OUT- =

V

OUT+ =

OUT+

OUT-

open,

3.6V or 0

open,

3.6V or 0

open,

3.6V or 0

open,

3.6V or 0

= 0 or V

= 0 or V

CC

CC

-1.0 ±0.01 +1.0 µA

-1.0 ±0.01 +1.0 µA

-15 +15 mA

15 mA

MAX9176/MAX9177

670MHz LVDS-to-LVDS and
Anything-to-LVDS 2:1 Multiplexers

4 _______________________________________________________________________________________

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 V

TH

, VTL, VID, VOD, and ∆VOD.

Note 2: Maximum and minimum limits over temperature are guaranteed by design and characterization. Devices are 100% tested

at T

A

= +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: C

L

includes scope probe and test jig capacitance.

Note 7: Pulse-generator output for differential inputs IN_+, IN_- (unless otherwise noted): f = 670MHz, 50% duty cycle, R

O

=

50Ω,

tR= 500ps, and tF= 500ps (0% to 100%). Pulse-generator output for single-ended inputs PD, SEL: tR = tF= 1.5ns (0.2V

CC

to 0.8VCC), 50% duty cycle, VOH= VCC+ 1.0V settling to VCC, V

OL

= -1.0V settling to zero.

Note 8: Pulse-generator output for t

DJ

: VOD= 0.15V, VOS= 1.25V, bit rate = 800Mbps, 223- 1 PRBS, R

O

=

50Ω, t

R

= 500ps, and t

F

= 500ps (0% to 100%).

Note 9: t

SKPP1

is the magnitude of the difference of any differential propagation delays between devices operating under identical

conditions.

Note 10: t

SKPP2

is 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
V

CM

= |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 V

CC

= 3.3V, |VID| = 0.2V, VCM= 1.25V, TA= +25°C.) (Notes 5, 6, 7)

(

)

(

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DIFFERENTIAL INPUTS (IN_+, IN_-)

High-to-Low Propagation Delay t

Low-to-High Propagation Delay t

PHL

PLH

Figures 4, 5 1.33 2.46 3.23 ns

Figures 4, 5 1.33 2.49 3.31 ns

Added Deterministic Jitter t

Added Random Jitter t

Pulse Skew  t

PLH

- t

 t

PHL

Part-to-Part Skew

DJ

RJ

SKP

t

SKPP1

t

SKPP2

Rise Time t

Fall Time t

Select to Out Delay t

Power-Down Time t

Power-Up Time t

PSO

PD

PU

Maximum Data Rate DR

Maximum Switching Frequency f

Switching Supply Current I

PRBS Supply Current I

MAX

CCSW

CCPR

Figures 4, 5 (Notes 8, 12) 68 80 ps

Figures 4, 5 (Note 12) 0.7 1.0 ps

Figures 4, 5 27 142 ps

Figures 4, 5 (Note 9) 0.4 1.3

Figures 4, 5 (Note 10) 2.0

Figures 4, 5 217 320 383 ps

R

Figures 4, 5 157 340 360 ps

F

Figure 6 2.0 2.7 ns

Figures 7, 8 6.0 ns

Figures 7, 8 35 µs
Figures 4, 5, VOD ≥ 250mV (Note 11) 800 Mbps

MAX

Figures 4, 5, VOD ≥ 250mV (Note 11) 670 MHz

fIN = 670MHz 38 58

fIN = 155MHz 26 47

DR = 800Mbps, 223 - 1 PRBS input 27 49 mA

P-P

RMS

ns

mA

MAX9176/MAX9177

670MHz LVDS-to-LVDS and

Anything-to-LVDS 2:1 Multiplexers

_______________________________________________________________________________________ 5

Figure 1. Input Structure

Figure 2. V

OD

Test Circuit

Figure 4. Transition Time and Propagation Delay Test Circuit

Figure 3. VOSTest Circuit

Figure 5. Transition Time and Propagation Delay Timing

R

IN2

IN_+

R

IN1

R

IN1

IN_-

1.25V

1.20V

1.25V

1.20V

IN_+

IN_-

V

CC

COMPARATOR

V

0.3V

CC

LVDS RCVR

MAX9176 FAIL-SAFE INPUT

OUT+

V

OD

OUT-

V

CC

R

IN3

TO MUX

5kΩ

=

V

R

L

TEST

0 TO V

CC

PULSE

GENERATOR

5kΩ

IN_+

IN_-

IN_+

IN_-

R

50Ω50Ω

IN3

MAX9177 INPUT

OUT+

OUT-

C

L

C

TO MUX

R

L

5kΩ

V

=

L

5kΩ

TEST

0 TO V

CC

1.25V

1.20V

1.25V

1.20V

IN_+

IN_-

OUT+

RL/2

RL/2

OUT-

IN_-

IN_+

OUT-

V

OS

OUT+

VOS = ((V

OUT+

(OUT+) - (OUT)-

) + (V

OUT-

20%

))/2

t

PLH

80%

0

t

PHL

V

OD+

t

R

80%

0

V

OD-

20%

t

F