19-5891; Rev 0; 6/11
EVALUATION KIT AVAILABLE
MAX9257A/MAX9258A
Fully Programmable Serializer/Deserializer
with UART/I
2
C Control Channel
General Description
The MAX9257A serializer pairs with the MAX9258A
deserializer to form a complete digital video serial link.
The devices feature programmable parallel data width,
parallel clock frequency range, spread spectrum, and
preemphasis. An integrated control channel transfers
data bidirectionally at power-up during video blank-
ing over the same differential pair used for video data.
This feature eliminates the need for external CAN or LIN
interface for diagnostics or programming. The clock is
recovered from input serial data at MAX9258A, hence
eliminating the need for an external reference clock.
The MAX9257A serializes 10, 12, 14, 16, and 18 bits
with the addition of two encoding bits for AC-coupling.
The MAX9258A deserializer links with the MAX9257A to
deserialize a maximum of 20 (data + encoding) bits per
pixel/parallel clock period for a maximum serial-data rate
of 840Mbps. The word length can be adjusted to accom-
modate a higher pixel/parallel clock frequency. The pixel
clock can vary from 5MHz to 70MHz, depending on the
serial-word length. Enabling parity adds two parity bits to
the serial word. The encoding bits reduce ISI and allow
AC-coupling.
The MAX9258A receives programming instructions from
the electronic control unit (ECU) during the control
channel and transmits to the MAX9257A over the serial
video link. The instructions can program or update the
MAX9257A, MAX9258A, or an external peripheral device,
such as a camera. The MAX9257A communicates with
the peripheral device with I
2
C or UART.
The devices operate from a +3.3V core supply and fea-
ture separate supplies for interfacing to +1.8V to +3.3V
logic levels. These devices are available in 40-lead TQFN
or 48-pin LQFP packages. These devices are specified
over the -40NC to +105NC temperature range.
Features
S
10/12/14/16/18-Bit Programmable Parallel Data
Width
S
MAX9258A Does Not Require Reference Clock
S
Parity Protection for Video and Control Channels
S
Programmable Spread Spectrum
S
Programmable Rising or Falling Edge for HSYNC,
VSYNC, and Clock
S
Up to 10 Remotely Programmable GPIO on
MAX9257A
S
Automatic Resynchronization in Case of Loss of
Lock
S
MAX9257A Parallel Clock Jitter Filter PLL with
Bypass
S
DC-Balanced Coding Allows AC-Coupling
S
Levels of Preemphasis for Up to 20m STP Cable
Drive
S
Integrity Test Using On-Chip Programmable PRBS
Generator and Checker
S
LVDS I/O Meet ISO 10605 ESD Protection (±10kV
Contact and ±30kV Air Discharge)
S
LVDS I/O Meet IEC 61000-4-2 ESD Protection
(±8kV Contact and ±20kV Air Discharge)
S
LVDS I/O Meet ±200V Machine Model ESD
Protection
S
-40NC to +105NC Operating Temperature Range
S
Space-Saving, 40-Pin TQFN (5mm x 5mm) with
Exposed Pad or 48-Pin LQFP Packages
S
3.3V Core Supply and 1.8V to 3.3V I/O Supply
Applications
Automotive Cameras
Industrial Cameras
Navigation Systems Display
In-Vehicle Entertainment Systems
Ordering Information
appears at end of data sheet.
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
For related parts and recommended products to use with this part,
refer to
www.maxim-ic.com/MAX9257A.related.
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
1
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.
MAX9257A/MAX9258A
Fully Programmable Serializer/Deserializer
with UART/I
2
C Control Channel
ABSOLUTE MAXIMUM RATINGS
V
CC_
to GND ........................................................-0.5V to +4.0V
Any Ground to Any Ground .................................-0.5V to +0.5V
SDI+, SDI-, SDO+, SDO- to GND ........................-0.5V to +4.0V
SDO+, SDO- Short Circuit to GND or V
CCLVDS
.......Continuous
DIN[0:15], GPIO[0:9], PCLK_IN, HSYNC_IN, VSYNC_IN,
SCL/TX, SDA/RX, REM to GND ......... -0.5V to (V
CCIO
+ 0.5V)
DOUT[0:15], PCLK_OUT, CCEN, HSYNC_OUT,
VSYNC_OUT, RX, LOCK, TX,
PD,
ERROR to GND .............................. -0.5V to (V
CCOUT
+ 0.5V)
Continuous Power Dissipation (TA = +70NC)
40-Lead TQFN
Multilayer PCB (derate 35.7mW/NC above +70NC) ...2857mW
48-Lead LQFP
Multilayer PCB (derate 21.7mW/NC above +70NC) ...1739mW
ESD Protection
Human Body Model (RD = 1.5kI, CS = 100pF)
All Pins to GND ............................................................Q3kV
IEC 61000-4-2 (RD = 330I, CS = 150pF)
Contact Discharge
(SDI+, SDI-, SDO+, SDO-) to GND..............................Q8kV
Air Discharge
(SDI+, SDI-, SDO+, SDO-) to GND............................Q20kV
ISO 10605 (RD = 2kI, CS = 330pF)
Contact Discharge
(SDI+, SDI-, SDO+, SDO-) to GND............................Q10kV
Air Discharge
(SDI+, SDI-, SDO+, SDO-) to GND............................Q30kV
Machine Model (RD = 0I, CS = 200pF)
All Pins to GND .........................................................
Q200V
Storage Temperature Range............................ -65NC to +150NC
Junction Temperature .....................................................+150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
Junction-to-Ambient Thermal Resistance (q
JA
)
40-Pin TQFN ................................................................28NC/W
48-Pin LQFP ................................................................46NC/W
Junction-to-Case Thermal Resistance (q
JC
)
40-Pin TQFN ...............................................................1.7NC/W
48-Pin LQFP ................................................................10NC/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
MAX9257A DC ELECTRICAL CHARACTERISTICS
(V
CC_
= +3.0V to +3.6V, V
CCIO
= +1.71V to +3.6V, R
L
= 50I
Q1%,
T
A
= -40NC to +105NC, unless otherwise noted. Typical values are
at V
CC_
= +3.3V, T
A
= +25NC.) (Notes 2, 3)
PARAMETER
SINGLE-ENDED INPUTS
V
CCIO
= +1.71V to +3V
High-Level Input Voltage
V
IH
V
CCIO
= +3V to +3.6V
REM input
V
CCIO
= +1.71V to +3V
Low-Level Input Voltage
V
IL
V
CCIO
= +3V to +3.6V
REM input
0.65 x
V
CCIO
2
2
0
0
0
V
CCIO
+
0.3
V
CCIO
+
0.3
V
CC
+
0.3
0.3 x
V
CCIO
0.8
0.8
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
2
MAX9257A/MAX9258A
Fully Programmable Serializer/Deserializer
with UART/I
2
C Control Channel
MAX9257A DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC_
= +3.0V to +3.6V, V
CCIO
= +1.71V to +3.6V, R
L
= 50I
Q1%,
T
A
= -40NC to +105NC, unless otherwise noted. Typical values are
at V
CC_
= +3.3V, T
A
= +25NC.) (Notes 2, 3)
PARAMETER
Input Current
Input Clamp Voltage
SINGLE-ENDED OUTPUTS
I
OH
= -100FA
High-Level Output Voltage
V
OH
I
OH
= -2mA
Low-Level Output Voltage
V
OL
I
OL
= 100FA
I
OL
= 2mA
Shorted to GND
Output Short-Circuit Current
I
OS
Shorted to V
CCIO
I2C/UART I/O
Input Leakage Current
High-Level Input Voltage SDA/RX
Low-Level Input Voltage SDA/RX
Low-Level Output Voltage
SCL, SDA
LVDS OUTPUTS (SDO+, SDO-)
Differential Output Voltage
Change in VOD Between
Complementary Output States
Common-Mode Voltage
Change in VOS Between
Complementary Output States
Output Short-Circuit Current
Magnitude of Differential Output
Short-Circuit Current
Differential Output Voltage
Input Hysteresis
(Figure 2)
V
OD
DV
OD
V
OS
DV
OS
I
OS
I
OSD
V
SDO+
or V
SDO-
= 0 or 3.6V
V
OD
= 0V
-15
Preemphasis off
(Figure 1)
250
350
460
25
1.050
1.25
1.375
30
+15
15
mV
mV
V
mV
mA
mA
I
ILKG
V
IH2
V
IL2
V
OL2
R
PULLUP
= 1.6kI to V
CCIO
V
I
= V
CCIO
-1
0.7 x
V
CCIO
0.3 x
V
CCIO
0.4
+1
FA
V
V
V
V
CCIO
= +1.71V to +3V
V
CCIO
= +3V to +3.6V
V
CCIO
= +1.71V to +3V
V
CCIO
= +3V to +3.6V
-40
-50
4
10
V
CCIO
-
0.1
V
CCIO
-
0.35
0.1
0.3
-4
-10
40
50
mA
SYMBOL
I
IN
V
CL
CONDITIONS
V
IN
= 0 to V
CCIO
V
IN
= 0 to V
CC
, REM input
I
CL
= -18mA
MIN
-20
-20
TYP
MAX
+20
+20
-1.5
UNITS
FA
V
V
V
CONTROL CHANNEL TRANSCEIVER
V
OD
VHYST+
250
Differential low-to-high threshold
Differential high-to-low threshold
25
-25
350
90
-90
460
165
-165
mV
mV
V
HYST-
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
3
MAX9257A/MAX9258A
Fully Programmable Serializer/Deserializer
with UART/I
2
C Control Channel
MAX9257A DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC_
= +3.0V to +3.6V, V
CCIO
= +1.71V to +3.6V, R
L
= 50I
Q1%,
T
A
= -40NC to +105NC, unless otherwise noted. Typical values are
at V
CC_
= +3.3V, T
A
= +25NC.) (Notes 2, 3)
PARAMETER
POWER SUPPLY
Q2%
spread, preemphasis off,
PRATE = 60MHz, SRATE = 840Mbps
No spread, preemphasis off,
PRATE = 60MHz, SRATE = 840Mbps
No spread, preemphasis = 20%,
PRATE = 60MHz, SRATE = 840Mbps
No spread, preemphasis = 60%,
PRATE = 60MHz, SRATE = 840Mbps
No spread, preemphasis = 100%,
PRATE = 60MHz, SRATE = 840Mbps
Q2%
spread, preemphasis off,
PRATE = 28.57MHz, SRATE = 400Mbps
No spread, preemphasis off,
PRATE = 28.57MHz, SRATE = 400Mbps
No spread, preemphasis = 100%,
PRATE = 28.57MHz, SRATE = 400Mbps
Worst-Case Supply Current
(Figure 3)
C
L
= 8pF, 12 bits
I
CCW
Q2%
spread, preemphasis off,
PRATE = 14.29MHz, SRATE = 200Mbps
No spread, preemphasis off,
PRATE = 14.29MHz, SRATE = 200Mbps
No spread, preemphasis = 100%,
PRATE = 14.29MHz, SRATE = 200Mbps
Q2%
spread, preemphasis off,
PRATE = 7.14MHz, SRATE = 100Mbps
No spread, preemphasis off,
PRATE = 7.14MHz, SRATE = 100Mbps
No spread, preemphasis = 100%,
PRATE = 7.14MHz, SRATE = 100Mbps
Q2%
spread, preemphasis off,
PRATE = 5MHz, SRATE = 70Mbps
No spread, preemphasis off,
PRATE = 5MHz, SRATE = 70Mbps
No spread, preemphasis = 100%,
PRATE = 5MHz, SRATE = 70Mbps
Sleep Mode Supply Current
I
CCS
Sleep mode
102
101
102
111
113
80
79
88
56
55
61
45
44
47
34
34
36
138
130
135
137
139
104
100
111
74
72
78
59
57
61
45
44
47
92
FA
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
4
MAX9257A/MAX9258A
Fully Programmable Serializer/Deserializer
with UART/I
2
C Control Channel
MAX9257A AC ELECTRICAL CHARACTERISTICS
(V
CC_
= +3.0V to +3.6V, V
CCIO
= +1.71V to +3.6V, R
L
= 50I
Q1%,
T
A
= -40NC to +105NC, unless otherwise noted. Typical values are
at V
CC_
= +3.3V, T
A
= +25NC.) (Notes 5, 9)
PARAMETER
Clock Period
Clock Frequency
Clock Duty Cycle
Clock Transition Time
SWITCHING CHARACTERISTICS
LVDS Output Rise Time
LVDS Output Fall Time
Control Transceiver Transition
Time
Input Setup Time
Input Hold Time
t
R
t
F
t
R1A
, t
F1A
t
R2
, t
F2
t
R1B
, t
F1B
t
S
t
H
t
PSD1
Parallel-to-Serial Delay
t
PSD2
PLL Lock Time
Random Jitter
Deterministic Jitter
SCL/TX, SDA/RX
Rise Time
Fall Time
Pulse Width of Spike Suppressed
in SDA
t
RS
t
FS
0.3 x V
CCIO
to 0.7 x
V
CCIO
, C
L
= 30pF
R
PULLUP
= 10kI
R
PULLUP
= 1.6kI
100
50
10
10
100
60
100
0
ns
ns
ns
400
60
40
ns
ns
t
LOCK
t
RJ
t
DJ
Q4%
spread
Combined FPLL and SPLL; PCLK_IN stable
420MHz LVDS output, spread off,
FPLL = bypassed
218 - 1 PRBS, SRATE = 840Mbps, 18 bits,
no spread
20% to 80% (Figure 4)
20% to 80% (Figure 4)
642
20% to 80% (Figure 16)
(Figure 5)
(Figure 5)
Spread off (Figure 6)
810
290
0
3
(4.55 x t
T
)
+ 11
(36.55 x t
T
)
+ 11
32,768
x t
T
12
142
ns
ps
(RMS)
ps (P-P)
315
315
970
1140
386
370
370
1390
1420
490
ns
ns
ps
ps
ps
SYMBOL
t
T
f
CLK
DC
t
R
, t
F
1/t
T
t
HIGH
/t
T
or t
LOW
/t
T
(Figure 7)
CONDITIONS
MIN
14.28
5
35
50
TYP
MAX
200.00
70
65
4
UNITS
ns
MHz
%
ns
PCLK½IN TIMING REQUIREMENTS
ns
0.7 x V
CCIO
to 0.3 x V
CCIO
, C
L
= 30pF
95kbps to 400kbps
400kbps to 1000kbps
1000kbps to 4250kbps
DC to 10Mbps (bypass mode)
400kbps
4.25Mbps, CL = 10pF
400kbps
4.25Mbps, CL = 10pF
t
SPK
Data Setup Time
Data Hold Time
t
SETUP
t
HOLD
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
