MAXIM MAX9420, MAX9423 Technical data

General Description

The MAX9420–MAX9423 are extremely fast, low-skew
quad LVECL-to-LVPECL translators designed for high­speed signal and clock driver applications. The
devices feature ultra-low propagation delay of 336ps
and channel-to-channel skew of 17ps.

The four channels can be operated synchronously with
an external clock, or in asynchronous mode, deter­mined by the state of the SEL input. An enable input
provides the ability to force all the outputs to a differen­tial low state.

These devices operate with a negative supply voltage
of -2.0V to -3.6V, compatible with LVECL input signals.
The positive supply range is 2.375V to 3.6V for differen­tial LVPECL output signals.

A variety of input and output terminations are offered for
maximum design flexibility. The MAX9420 has open
inputs and open-emitter outputs. The MAX9421 has
open inputs and 50Ω series outputs. The MAX9422 has
100Ω differential input impedance and open-emitter
outputs. The MAX9423 has 100Ω differential input
impedance and 50Ω series outputs.

The MAX9420–MAX9423 are specified for operation
from -40°C to +85°C, and are offered in space-saving
32-pin 5mm ✕ 5mm TQFP and 32-lead 5mm ✕ 5mm
QFN packages.

Applications

Data and Clock Driver and Buffer

Central Office Backplane Clock Distribution

DSLAM Backplane

Base Station

ATE

Features

♦ >500mV Differential Output at 3.0GHz Clock

♦ 336ps (typ) Propagation Delay in Asynchronous

Mode

♦ 17ps (typ) Channel-to-Channel Skew

♦ Integrated 50Ω Outputs (MAX9421/MAX9423)

♦ Integrated 100Ω Inputs (MAX9422/MAX9423)

♦ Synchronous/Asynchronous Operation

MAX9420–MAX9423

Quad Differential LVECL-to-LVPECL Translators

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

TQFP (5mm x 5mm)

TOP VIEW

32 28

293031

25

26

27

IN0

VCCOUT0

OUT0

IN0

GND

IN1

IN1

10

13

15

14

1611 12

9

IN3

V

CC

IN3

OUT3

OUT3

IN2

GND

IN2

17

18

19

20

21

22

23

OUT1

24 V

CC

OUT1

GND

GND

OUT2

OUT2

V

CC

2

3

4

5

6

7

8V

EE

EN

EN

CLK

CLK

SEL

SEL

1V

EE

MAX9420
MAX9421
MAX9422
MAX9423

Pin Configurations

19-2285; Rev 0; 1/02

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.

Pin Configurations continued at end of data sheet.

*Future product—contact factory for availability.

PART

TEMP

RANGE

MAX9420EHJ -40°C to +85°C 32 TQFP Open Open

MAX9420EGJ* -40°C to +85°C 32 QFN Open Open

MAX9421EHJ -40°C to +85°C 32 TQFP Open 50Ω

MAX9421EGJ* -40°C to +85°C 32 QFN Open 50Ω

MAX9422EHJ -40°C to +85°C 32 TQFP 100Ω Open

MAX9422EGJ* -40°C to +85°C 32 QFN 100Ω Open

MAX9423EHJ -40°C to +85°C 32 TQFP 100Ω 50Ω

MAX9423EGJ* -40°C to +85°C 32 QFN 100Ω 50Ω

PIN-

PACKAGE

DATA

INPUT

OUTPUT

MAX9420–MAX9423

Quad Differential LVECL-to-LVPECL Translators

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VEE= -2.0V to -3.6V, VCC= 2.375V to 3.6V, GND = 0, MAX9420/MAX9422 outputs terminated with 50Ω ±1% to VCC- 2.0V. Typical val­ues are at V

EE

= -3.3V, VCC= 3.3V, TA= +25°C, V

IHD

= -0.9V, V

ILD

= -1.7V, unless otherwise noted.) (Notes 1, 2, and 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 +4.1V

V

EE

to GND............................................................-4.1V to +0.3V

Inputs to GND .............................................(V

EE

- 0.3V) to +0.3V

Differential Input Voltage .......................................................±3V

Continuous Output Current .................................................50mA

Surge Output Current........................................................100mA

Continuous Power Dissipation (T

A

= +70°C)

Single-Layer PC Board

32-Pin 5mm

✕ 5mm TQFP

(derate 9.5mW/°C above +70°C)................................761mW

32-Lead 5mm

✕ 5mm QFN

(derate 21.3mW/°C above +70°C).................................1.7W

Junction-to-Ambient Thermal Resistance in Still Air

32-Pin 5mm

✕ 5mm TQFP......................................+105°C/W

32-Lead 5mm

✕ 5mm QFN......................................+47°C/W

Junction-to-Ambient Thermal Resistance with 500

LFPM Airflow
32-Pin 5mm

✕ 5mm TQFP.........................................+73°C/W

Junction-to-Case Thermal Resistance

32-Pin 5mm

✕ 5mm TQFP.........................................+25°C/W

32-Lead 5mm

✕ 5mm QFN.........................................+2°C/W

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

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

ESD Protection

Human Body Model (IN_, IN_) ........................................500V

Others.............................................................................1.2kV

Lead Temperature (soldering, 10s) .................................+300°C

LVECL INPUTS (IN_, IN_, CLK, CLK, EN, EN, SEL, SEL)

Differential Input High Voltage V

Differential Input Low Voltage V

Differential Input Voltage V

Input Current IIH, I

Differential Input Resistance
(IN, IN)

LVPECL OUTPUTS (OUT_, OUT_)

Differential Output Voltage

Output Common-Mode Voltage V

Internal Current Source I

Output Impedance R

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

IHD

ILD

ID

Figure 1

Figure 1 V

Figure 1

MAX9420/
MAX9421

IL

MAX9422/
MAX9423

MAX9422/MAX9423 86 100 114 Ω

IN

­Figure 1 600 660 mV

OL

Figure 1

MAX9421/MAX9423, Figure 2 6.5 8.2 10.0 mA

MAX9421/MAX9423, Figure 2 40 50 60 Ω

V

V

SINK

R

OH

OCM

OUT

V

+

EE

1.4

EE

VEE ≤ -3.0V 0.2 3.0

> -3.0V 0.2 V

V

EE

EN, EN, SEL, SEL , IN_, IN_,
CLK, or CLK = V

IHD

or V

ILD

EN, EN, SEL, SEL, CLK, or
CLK = V

IHD

or V

ILD

-10 25

-10 25

V

-

CC

1.5

VCC -

1.25

VCC -

0V

-0.2 V

EE

1.1

V

µA

V

MAX9420–MAX9423

Quad Differential LVECL-to-LVPECL Translators

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VEE= -2.0V to -3.6V, VCC= 2.375V to 3.6V, GND = 0, MAX9420/MAX9422 outputs terminated with 50Ω ±1% to VCC- 2.0V. Typical val­ues are at V

EE

= -3.3V, VCC= 3.3V, TA= +25°C, V

IHD

= -0.9V, V

ILD

= -1.7V, unless otherwise noted.) (Notes 1, 2, and 3)

AC ELECTRICAL CHARACTERISTICS

(VEE= -2.0V to -3.6V, VCC= 2.375V to 3.6V, GND = 0, outputs terminated with 50Ω ±1% to VCC- 2.0V. For SEL = high, CLK = high
or low, f

IN

= 2.0GHz. For SEL = low, FIN= 1.5GHz, CLK = 3.0GHz, input transition time = 125ps (20% to 80%), V

IHD

= VEE+ 1.4V to

0, V

ILD

= VEEto -0.2V, V

IHD

- V

ILD

= 0.2V to the smaller of 3.0V or |VEE|. Typical values are at VEE= -3.3V, VCC= 3.3V, GND = 0, T

A

= +25°C, V

IHD

= -0.9V, V

ILD

= -1.7V, unless otherwise noted.) (Note 4)

)

)

(

)

(

)

(

)

POWER SUPPLY

Negative Supply Current I

Positive Supply Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

EE

CC

OUT_, OUT_
open

OUT_, OUT_
open

MAX9421/MAX9422/
MAX9423

710mA

MAX9421/MAX9423 153 -180

MAX9420/MAX9422 87 105

mA

IN-to-OUT Differential

CLK-to-OUT Differential

IN-to-OUT Channel-to-Channel
Skew (Note 5)

CLK-to-OUT Channel-to­Channel Skew (Note 5)

Maximum Clock Frequency f

Maximum Data Frequency f

Added Random Jitter (Note 6) t

Added Deterministic Jitter
(Note 6)

IN-to-CLK Setup Time t

CLK-to-IN Hold Time t

Output Rise Time t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

t

P LH 1, tP H L 1

t

P LH 2, tP H L 2

t

SKD1

t

SKD2

CLK(MAX

IN(MAX

RJ

t

DJ

SEL = high, Figure 3 250 336 450 ps

SEL = low, Figure 4 350 506 575 ps

SEL = high 17 60 ps

SEL = low 17 55 ps

V

VOL ≥ 500mV, SEL = low 3.0 GHz

OH

-

V

VOL ≥ 400mV, SEL = high 2 GHz

OH

-

SEL = low, f

SEL = high, fIN = 2GHz 0.53 1.0 ps

SEL = low, f

23

- 1 PRBS pattern

2

SEL = high, IN_ = 3.0Gbps 223 - 1 PRBS

= 3.0GHz, fIN = 1.5GHz 0.65 1.0 ps

CLK

= 3.0GHz, IN_ = 3.0Gbps,

CLK

pattern

Figure 4 80 ps

S

H

Figure 4 80 ps

Figure 3 90 120 ps

R

28 45

23 45

RMS

RMS

ps

P-P

AC ELECTRICAL CHARACTERISTICS (continued)

(VEE= -2.0V to -3.6V, VCC= 2.375V to 3.6V, GND = 0, outputs terminated with 50Ω ±1% to VCC- 2.0V. For SEL = high, CLK = high
or low, f

IN

= 2.0GHz. For SEL = low, FIN= 1.5GHz, CLK = 3.0GHz, input transition time = 125ps (20% to 80%), V

IHD

= VEE+ 1.4V to

0, V

ILD

= VEEto -0.2V, V

IHD

- V

ILD

= 0.2V to the smaller of 3.0V or |VEE|. Typical values are at VEE= -3.3V, VCC= 3.3V, GND = 0, T

A

= +25°C, V

IHD

= -0.9V, V

ILD

= -1.7V, unless otherwise noted.) (Note 4)

MAX9420–MAX9423

Quad Differential LVECL-to-LVPECL Translators

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VEE= -3.3V, VCC= 3.3V, GND = 0, MAX9420/MAX9422 outputs terminated with 50Ω ±1% to VCC- 2.0V, SEL = high, f

CLK

= 3.0GHz,

fIN= 1.5GHz, input transition time = 125ps (20% to 80%), V

IHD

= -0.9V, V

ILD

= -1.7V, TA= +25°C, unless otherwise noted.)

Note 1: Measurements are made with the device in thermal equilibrium.
Note 2: Current into a pin is defined as positive. Current out of a pin is defined as negative.
Note 3: DC parameters are production tested at +25°C. DC limits are guaranteed by design and characterization over the full oper-

ating temperature range.

Note 4: Guaranteed by design and characterization. Limits are set to ±6 sigma.
Note 5: Measured between outputs of the same part at the signal crossing points for a same-edge transition.
Note 6: Device jitter added to the input signal.

Output Fall Time t

Propagation Delay Temperature
Coefficient

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Figure 3 90 120 ps

F

∆tPD/

∆T

0.2 1 ps/°C

SUPPLY CURRENT (ICC)

vs. TEMPERATURE

100

MAX9420/MAX9422
SEL = HIGH

95

OUTPUTS NOT TERMINATED

90

85

80

SUPPLY CURRENT (mA)

75

70

-40 10-15 35 60 85
TEMPERATURE (°C)

9

MAX9420 toc01

8

7

6

OUTPUT AMPLITUDE (mV)

5

4

-40 10-15 35 60 85

OUTPUT RISE/FALL TIME

vs. TEMPERATURE

100

MAX9420/MAX9422
SEL = HIGH

95

t

90

85

OUTPUT RISE/FALL TIME (ps)

80

75

-40 10-15 35 60 85
TEMPERATURE (°C)

R

t

F

370

360

MAX9420 toc04

350

340

330

320

PROPAGATION DELAY (ps)

310

300

290

-40 10-15 35 60 85

SUPPLY CURRENT (IEE)

vs. TEMPERATURE

MAX9420/MAX9422
SEL = HIGH
OUTPUTS NOT TERMINATED

TEMPERATURE (°C)

IN-TO-OUT PROPAGATION DELAY

vs. TEMPERATURE

MAX9420/MAX9422
SEL = HIGH

t

PLH1

t

PHL1

TEMPERATURE (°C)

1000

MAX9420 toc02

800

600

400

OUTPUT AMPLITUDE (mV)

200

0

0 1000500 1500 2000 2500 3000 3500

600

575

MAX9420 toc05

550

525

500

475

PROPAGATION DELAY (ps)

450

425

-40 10-15 35 60 85

OUTPUT AMPLITUDE (VOH - VOL)

vs. FREQUENCY

MAX9420/MAX9422
SEL = HIGH

IN_ FREQUENCY (MHz)

CLK-TO-OUT PROPAGATION DELAY

vs. TEMPERATURE

MAX9420/MAX9422
SEL = LOW

TEMPERATURE (°C)

t

PLH2

t

PHL2

MAX9420 toc03

MAX9420 toc06