MAXIM MAX9234, MAX9236, MAX9238 User Manual

General Description

The MAX9234/MAX9236/MAX9238 deserialize three
LVDS serial-data inputs into 21 single-ended
LVCMOS/LVTTL outputs. A parallel-rate LVDS clock
received with the LVDS data streams provides timing for
deserialization. The outputs have a separate supply,
allowing 1.8V to 5V output logic levels. All these devices
are hot-swappable and allow “on-the-fly” frequency
programming.

The MAX9234/MAX9236/MAX9238 feature DC balance,
which allows isolation between a serializer and deseri­alizer using AC-coupling. Each deserializer decodes
data transmitted by one of the MAX9209/MAX9211/
MAX9213/MAX9215 serializers.

The MAX9234 has a rising-edge output strobe. The
MAX9236/MAX9238 have a falling-edge output strobe.
The MAX9234/MAX9236/MAX9238 operate in DC­balanced mode only.

The MAX9234/MAX9236 operate with a parallel input
clock of 8MHz to 34MHz, while the MAX9238 operates
from 16MHz to 66MHz. The transition time of the single­ended outputs is increased on the low-frequency version
parts (MAX9234/MAX9236) for reduced EMI. The LVDS
inputs meet ISO 10605 ESD specification, ±25kV for Air­Gap Discharge and ±8kV Contact Discharge.

The MAX9234/MAX9236/MAX9238 are available in 48-pin
TSSOP packages and operate over the -40°C to +85°C
temperature range.

Applications

Automotive Navigation Systems

Automotive DVD Entertainment Systems

Digital Copiers

Laser Printers

Features

♦ DC Balance Allows AC-Coupling for Wider Input

Common-Mode Voltage Range

♦ On-the-Fly Frequency Programming
♦ Operating Frequency Range

8MHz to 34MHz (MAX9234/MAX9236)
16MHz to 66MHz (MAX9238)

♦ Falling-Edge Output Strobe (MAX9236/MAX9238)
♦ Slower Output Transitions for Reduced EMI

(MAX9234/MAX9236)

♦ High-Impedance Outputs when PWRDWN Is Low

Allow Output Busing

♦ 5V-Tolerant PWRDWN Input
♦ PLL Requires No External Components
♦ Up to 1.386Gbps Throughput
♦ Separate Output Supply Pins Allow Interface to

1.8V, 2.5V, 3.3V, and 5V Logic

♦ LVDS Inputs Meet ISO 10605 ESD Requirements
♦ LVDS Inputs Conform to ANSI TIA/EIA-644 LVDS

Standard

♦ Low-Profile, 48-Lead TSSOP Package
♦ +3.3V Main Power Supply
♦ -40°C to +85°C Operating Temperature Range

MAX9234/MAX9236/MAX9238

Hot-Swappable, 21-Bit, DC-Balanced LVDS

Deserializers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3641; Rev 1; 10/07

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.

Functional Diagram and Pin Configuration appear at end of
data sheet.

PART

TEMP RANGE

PIN­PACKAGE

PKG

CODE

MAX9234EUM

48 TSSOP

U48-1

MAX9236EUM

48 TSSOP

U48-1

MAX9238EUM

48 TSSOP

U48-1

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

MAX9234/MAX9236/MAX9238

Hot-Swappable, 21-Bit, DC-Balanced LVDS
Deserializers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, V

CCO

= +3.0V to +5.5V, PWRDWN = high, differential input voltage ⏐VID⏐ = 0.05V to 1.2V, input common-

mode voltage V

CM

= ⏐VID/2⏐ to 2.4V - ⏐VID/2⏐, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= V

CCO

=

+3.3V, ⏐V

ID

⏐ = 0.2V, VCM= 1.25V, TA= +25°C.) (Notes 1, 2)

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...........................................................-0.5V to +4.0V

V

CCO

to GND.........................................................-0.5V to +6.0V

RxIN_, RxCLK IN_ to GND ....................................-0.5V to +4.0V

PWRDWN to GND....................................................-0.5V to 6.0V

RxOUT_, RxCLK OUT to GND ................-0.5V to (V

CCO

+ 0.5V)

Continuous Power Dissipation (TA= +70°C)

48-Pin TSSOP (derate 16mW/°C above +70°C) ....... 1282mW

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

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

ESD Protection

Human Body Model (RD= 1.5kΩ, CS= 100pF)

All Pins to GND ..................................………………….±5kV

IEC 61000-4-2 (RD= 330Ω, CS = 150pF)

Contact Discharge (RxIN_, RxCLK IN_) to GND .........±8kV

Air-Gap Discharge (RxIN_, RxCLK IN_) to GND .......±15kV

ISO 10605 (RD= 2kΩ, CS= 330pF)

Contact Discharge (RxIN_, RxCLK IN_) to GND ........±8kV

Air Discharge (RxIN_, RxCLK IN_) to GND ...............±25kV

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SINGLE-ENDED INPUT (PWRDWN)

High-Level Input Voltage V

IH

2.0 5.5 V

Low-Level Input Voltage V

IL

V

Input Current I

IN

VIN = high or low -70

µA

Input Clamp Voltage V

CL

ICL = -18mA

V

SINGLE-ENDED OUTPUTS (RxOUT_, RxCLK OUT)

IOH = -100µA

V

CCO

-

0.1

V

CCO

-

MAX9234/
MAX9236

RxOUT_

V

CCO

-

High-Level Output Voltage V

OH

IOH = -2mA

MAX9238

V

CCO

-

V

IOL = 100µA 0.1

RxOUT_

Low-Level Output Voltage V

OL

IOL = 2mA

MAX9238 0.2

V

High-Impedance Output Current

I

OZ

PWRDWN = low,
V

OUT_

= -0.3V to V

CCO

+ 0.3V

-20

µA

-10 -40

MAX9234/

RxOUT_ -5 -20

V

CCO

= 3.0V to

MAX9238 -10 -40

-28 -75

MAX9234/

RxOUT_ -14 -37

Output Short-Circuit Current

(Note: Short one output at a
time.)

I

OS

V

CCO

= 4.5V to

MAX9238 -28 -75

mA

3.6V, V

5.5V, V

OUT

OUT

-0.3 +0.8

+70

-1.5

RxCLK OUT

RxCLK OUT 0.2

MAX9234/
MAX9236

MAX9236

= 0

MAX9236

= 0

RxCLK OUT

RxCLK OUT

0.25

0.40

0.25

0.26

+20

MAX9234/MAX9236/MAX9238

Hot-Swappable, 21-Bit, DC-Balanced LVDS

Deserializers

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V, V

CCO

= +3.0V to +5.5V, PWRDWN = high, differential input voltage ⏐VID⏐ = 0.05V to 1.2V, input common-

mode voltage V

CM

= ⏐VID/2⏐ to 2.4V - ⏐VID/2⏐, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= V

CCO

=

+3.3V, ⏐V

ID

⏐ = 0.2V, VCM= 1.25V, TA= +25°C.) (Notes 1, 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

LVDS INPUTS

Differential Input-High Threshold

V

TH

50 mV

Differential Input-Low Threshold V

TL

-50 mV

Input Current

PWRDWN = high or low -25

µA

Power-Off Input Current

VCC = V

CCO

= 0 or open,

PWRDWN = 0 or open

-40

µA

PWRDWN = high or low (Figure 1)

Input Resistor 1 R

IN1

VCC = V

CCO

= 0 or open (Figure 1)

42 78 kΩ

POWER SUPPLY

8MHz 42

16MHz 57

MAX9234/
MAX9236

34MHz 98

16MHz 63

34MHz

Worst-Case Supply Current I

CCW

CL = 8pF,
worst-case
pattern; V

CC

=

V

CCO

= 3.0V to

3.6V, Figure 2

MAX9238

66MHz

mA

Power-Down Supply Current I

CCZ

PWRDWN = low 50 µA

I

IN+, IIN-

I

INO+, IINO-

+25

+40

106

177

MAX9234/MAX9236/MAX9238

Hot-Swappable, 21-Bit, DC-Balanced LVDS
Deserializers

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

and VTL.

Note 2: Maximum and minimum limits overtemperature are guaranteed by design and characterization. Devices are production

tested at T

A

= +25°C.

Note 3: AC parameters are guaranteed by design and characterization, and are not production tested. Limits are set at ±6 sigma.
Note 4: C

L

includes probe and test jig capacitance.

Note 5: RCIP is the period of RxCLK IN. RCOP is the period of RxCLK OUT. RCIP = RCOP.
Note 6: RSKM measured with

≤

150ps cycle-to-cycle jitter on RxCLK IN.

AC ELECTRICAL CHARACTERISTICS

(VCC= V

CCO

= +3.0V to +3.6V, 100mV

P-P

at 200kHz supply noise, CL= 8pF, PWRDWN = high, differential input voltage ⏐VID⏐ =

0.1V to 1.2V, input common mode voltage V

CM

= ⏐VID/2⏐ to 2.4V - ⏐VID/2⏐, TA= -40°C to +85°C, unless otherwise noted. Typical

values are at V

CC

= V

CCO

= +3.3V, ⏐VID⏐ = 0.2V, VCM= 1.25V, TA= +25°C.) (Notes 3, 4, 5)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

RxOUT

MAX9234/
MAX9236

2.2

3.9

Output Rise Time CLHT

0.1V

CCO

to

0.9V

CCO

,

Figure 3

MAX9238 2.2

3.9

ns

RxOUT

MAX9234/
MAX9236

1.3

2.9Output Fall Time CHLT

0.9V

CCO

to

0.1V

CCO

,

Figure 3

MAX9238 1.3

2.9

ns

8MHz

16MHz

34MHz

RxIN Skew Margin RSKM

Figure 4
(Note 6)

MAX9238 66MHz

ps

RxCLK OUT High Time RCOH Figures 5a, 5b

0.35 x
ns

RxCLK OUT Low Time RCOL Figures 5a, 5b

0.35 x
ns

RxOUT Setup to RxCLK OUT RSRC Figures 5a, 5b

0.30 x
ns

RxOUT Hold from RxCLK OUT RHRC Figures 5a, 5b

0.45 x
ns

RxCLK IN to RxCLK OUT Delay RCCD Figures 6a, 6b 4.9

8.1 ns

Deserializer Phase-Locked Loop
Set

RPLLS Figure 7

32800

ns

Deserializer Power-Down Delay RPDD Figure 8

ns

3.52 5.04 6.24

RxCLK OUT

1.95 3.18 4.35

RxCLK OUT

6600 7044

2560 3137

900 1327

330 685

RCOP

RCOP

3.15

3.15

2.12

2.12

RCOP

RCOP

6.17

x RCIP

100

MAX9234/MAX9236/MAX9238

Hot-Swappable, 21-Bit, DC-Balanced LVDS

Deserializers

_______________________________________________________________________________________ 5

MAX9234/MAX9236
WORST-CASE PATTERN AND PRBS
SUPPLY CURRENT vs. FREQUENCY

MAX9234/6/8 toc01

FREQUENCY (MHz)

SUPPLY CURRENT (mA)

3025201510

40

30

50

60

70

80

90

100

54035

WORST CASE

27 - 1 PRBS

MAX9238
WORST-CASE PATTERN AND PRBS
SUPPLY CURRENT vs. FREQUENCY

MAX9234/6/8 toc02

FREQUENCY (MHz)

SUPPLY CURRENT (mA)

6050403020

60

40

80

100

120

140

160

180

10 70

WORST CASE

27 - 1 PRBS

MAX9234/MAX9236

RxOUT TRANSITION TIME

vs. OUTPUT SUPPLY VOLTAGE (V

CCO

)

MAX9234/6/8 toc03

OUTPUT SUPPLY VOLTAGE (V)

OUTPUT TRANSITION TIME (ns)

4.54.03.53.0

1

2

3

4

5

6

7

2.5 5.0

CLHT

CHLT

MAX9238

RxOUT TRANSITION TIME

vs. OUTPUT SUPPLY VOLTAGE (V

CCO

)

MAX9234/6/8 toc04

OUTPUT SUPPLY VOLTAGE (V)

OUTPUT TRANSITION TIME (ns)

4.54.03.53.0

0

1

2

3

4

5

2.5 5.0

CLHT

CHLT

Typical Operating Characteristics

(VCC= V

CCO

= +3.3V, CL= 8pF, PWRDWN = high, differential input voltage ⏐VID⏐ = 0.2V, input common-mode voltage VCM= 1.2V,

T

A

= +25°C, unless otherwise noted.)