19-3641; Rev 0; 4/05
Hot-Swappable, 21-Bit, DC-Balanced LVDS
Deserializers
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 deseri-
alizer 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 DC-
balanced 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 single-
ended outputs is increased on the low-frequency version
parts (MAX9234/MAX9236) for reduced EMI. The LVDS
inputs meet ISO 10605 ESD specification, ±25kV for Air
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.
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
Applications
Automotive Navigation Systems
Automotive DVD Entertainment Systems
Digital Copiers
Laser Printers
Ordering Information
PART
MAX9234EUM
MAX9236EUM
MAX9238EUM
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
48 TSSOP
48 TSSOP
48 TSSOP
Functional Diagram and Pin Configuration appear at end of
data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
Hot-Swappable, 21-Bit, DC-Balanced LVDS
Deserializers
MAX9234/MAX9236/MAX9238
ABSOLUTE MAXIMUM RATINGS
V
CC
to 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 (VCCO + 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
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
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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, V
CCO
= +3.0V to +5.5V,
PWRDWN
= high, differential input voltage
V
ID
= 0.05V to 1.2V, input common-
mode voltage V
CM
=
V
ID
/2 to 2.4V -
V
ID
/2, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= V
CCO
=
+3.3V,
V
ID
= 0.2V, V
CM
= 1.25V, T
A
= +25°C.) (Notes 1, 2)
PARAMETER
High-Level Input Voltage
Low-Level Input Voltage
Input Current
Input Clamp Voltage
SYMBOL
V
IH
V
IL
I
IN
V
CL
V
IN
= high or low
I
CL
= -18mA
V
CCO
-
0.1
RxCLK OUT
High-Level Output Voltage
V
OH
I
OH
= -2mA
MAX9238
I
OL
= 100µA
Low-Level Output Voltage
V
OL
I
OL
= 2mA
MAX9234/
MAX9236
MAX9238
High-Impedance Output Current
I
OZ
PWRDWN
= low,
V
OUT_
= -0.3V to V
CCO
+ 0.3V
V
CCO
= 3.0V to
3.6V, V
OUT
= 0
I
OS
V
CCO
= 4.5V to
5.5V, V
OUT
= 0
MAX9234/
MAX9236
MAX9238
MAX9234/
MAX9236
MAX9238
RxCLK OUT
RxOUT_
RxCLK OUT
RxOUT_
-20
-10
-5
-10
-28
-14
-28
RxCLK OUT
RxOUT_
MAX9234/
MAX9236
RxOUT_
V
CCO
-
0.25
V
V
CCO
-
0.40
V
CCO
-
0.25
0.1
0.2
0.26
0.2
+20
-40
-20
-40
-75
-37
-75
mA
µA
V
CONDITIONS
MIN
2.0
-0.3
-70
TYP
MAX
5.5
+0.8
+70
-1.5
UNITS
V
V
µA
V
SINGLE-ENDED INPUT (PWRDWN)
SINGLE-ENDED OUTPUTS (RxOUT_, RxCLK OUT)
I
OH
= -100µA
Output Short-Circuit Current
(Note: Short one output at a
time.)
2
_______________________________________________________________________________________
Hot-Swappable, 21-Bit, DC-Balanced LVDS
Deserializers
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, V
CCO
= +3.0V to +5.5V,
PWRDWN
= high, differential input voltage
V
ID
= 0.05V to 1.2V, input common-
mode voltage V
CM
=
V
ID
/2 to 2.4V -
V
ID
/2, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= V
CCO
=
+3.3V,
V
ID
= 0.2V, V
CM
= 1.25V, T
A
= +25°C.) (Notes 1, 2)
PARAMETER
LVDS INPUTS
Differential Input-High Threshold
Differential Input-Low Threshold
Input Current
Power-Off Input Current
Input Resistor 1
POWER SUPPLY
8MHz
C
L
= 8pF,
worst-case
pattern; V
CC
=
V
CCO
= 3.0V to
3.6V, Figure 2
PWRDWN
= low
MAX9234/
MAX9236
16MHz
34MHz
16MHz
MAX9238
34MHz
66MHz
Power-Down Supply Current
I
CCZ
42
57
98
63
106
177
50
µA
mA
V
TH
V
TL
I
IN+,
I
IN-
I
INO+,
I
INO-
R
IN1
PWRDWN
= high or low
V
CC
= V
CCO
= 0 or open,
PWRDWN
= 0 or open
PWRDWN
= high or low (Figure 1)
V
CC
= V
CCO
= 0 or open (Figure 1)
-50
-25
-40
42
+25
+40
78
50
mV
mV
µA
µA
kΩ
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9234/MAX9236/MAX9238
Worst-Case Supply Current
I
CCW
_______________________________________________________________________________________
3
Hot-Swappable, 21-Bit, DC-Balanced LVDS
Deserializers
MAX9234/MAX9236/MAX9238
AC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CCO
= +3.0V to +3.6V, 100mV
P-P
at 200kHz supply noise, C
L
= 8pF,
PWRDWN
= high, differential input voltage
V
ID
=
0.1V to 1.2V, input common mode voltage V
CM
=
V
ID
/2 to 2.4V -
V
ID
/2, T
A
= -40°C to +85°C, unless otherwise noted. Typical
values are at V
CC
= V
CCO
= +3.3V,
V
ID
= 0.2V, V
CM
= 1.25V, T
A
= +25°C.) (Notes 3, 4, 5)
PARAMETER
Output Rise Time
SYMBOL
CLHT
0.1V
CCO
to
0.9V
CCO
,
Figure 3
0.9V
CCO
to
0.1V
CCO
,
Figure 3
CONDITIONS
MAX9234/
MAX9236
MAX9238
MAX9234/
MAX9236
MAX9238
8MHz
RxIN Skew Margin
RSKM
Figure 4
(Note 6)
MAX9238
RxCLK OUT High Time
RxCLK OUT Low Time
RxOUT Setup to RxCLK OUT
RxOUT Hold from RxCLK OUT
RxCLK IN to RxCLK OUT Delay
Deserializer Phase-Locked Loop
Set
Deserializer Power-Down Delay
RCOH
RCOL
RSRC
RHRC
RCCD
RPLLS
RPDD
Figures 5a, 5b
Figures 5a, 5b
Figures 5a, 5b
Figures 5a, 5b
Figures 6a, 6b
Figure 7
Figure 8
16MHz
34MHz
66MHz
RxOUT
RxCLK OUT
RxOUT
RxCLK OUT
MIN
3.52
2.2
2.2
1.95
1.3
1.3
6600
2560
900
330
0.35 x
RCOP
0.35 x
RCOP
0.30 x
RCOP
0.45 x
RCOP
4.9
6.17
8.1
32800
x RCIP
100
TYP
5.04
3.15
3.15
3.18
2.12
2.12
7044
3137
1327
685
ns
ns
ns
ns
ns
ns
ns
ps
MAX
6.24
3.9
3.9
4.35
2.9
2.9
ns
ns
UNITS
Output Fall Time
CHLT
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 V
TL
.
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.
4
_______________________________________________________________________________________
Hot-Swappable, 21-Bit, DC-Balanced LVDS
Deserializers
Typical Operating Characteristics
(V
CC
= V
CCO
= +3.3V, C
L
= 8pF,
PWRDWN
= high, differential input voltage
V
ID
= 0.2V, input common-mode voltage V
CM
= 1.2V,
T
A
= +25°C, unless otherwise noted.)
MAX9234/MAX9236/MAX9238
MAX9234/MAX9236
WORST-CASE PATTERN AND PRBS
SUPPLY CURRENT vs. FREQUENCY
MAX9234/6/8 toc01
MAX9238
WORST-CASE PATTERN AND PRBS
SUPPLY CURRENT vs. FREQUENCY
MAX9234/6/8 toc02
100
90
SUPPLY CURRENT (mA)
80
WORST CASE
70
60
2
7
-1 PRBS
50
40
30
5
10
15
20
25
30
35
180
160
SUPPLY CURRENT (mA)
140
120
100
80
60
40
2
7
-1 PRBS
WORST CASE
40
10
20
30
40
50
60
70
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX9234/MAX9236
RxOUT TRANSITION TIME
vs. OUTPUT SUPPLY VOLTAGE (V
CCO
)
MAX9234/6/8 toc03
MAX9238
RxOUT TRANSITION TIME
vs. OUTPUT SUPPLY VOLTAGE (V
CCO
)
MAX9234/6/8 toc04
7
6
CLHT
5
4
CHLT
3
2
1
2.5
3.0
3.5
4.0
4.5
5
OUTPUT TRANSITION TIME (ns)
OUTPUT TRANSITION TIME (ns)
4
CLHT
3
2
CHLT
1
0
5.0
2.5
3.0
3.5
4.0
4.5
5.0
OUTPUT SUPPLY VOLTAGE (V)
OUTPUT SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
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