MAX9257GCM/V+ Maxim Integrated Products, MAX9257GCM/V+ Datasheet - Page 37

• Manufacturer Part Number: MAX9257GCM/V+
• Description: IC SER/DESER PROG 48-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX9257GCM/V+

• Function: Serializer/Deserializer
• Data Rate: 840Mbps
• Input Type: Serial
• Output Type: LVDS
• Number Of Inputs: 16
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX9257 features a UART-to-I
converts UART packets to I
verter works as a repeater between the ECU and exter-
nal I
and converts UART read/write packets from the ECU to
I
the UART-to-I
directly into I
follows the UART packet protocol. The I
period is approximately the same as the UART bit clock
period (t
I
ETO timer. Choose ETO large enough so that I
commands are not lost due to ETO timing out.
The MAX9257 acts like a master in I
with the peripheral device. The MAX9257 takes less
than 22 UART bit times to convert UART packets into
Table 31. Timing Information for I
* t
2
2
SCL Clock Frequency
Start Condition Hold Time
Low Period of SCL Clock
High Period of SCL Clock
Repeated START Condition
Setup Time
Data Hold Time
Data Setup Time
Setup Time for STOP Condition
Bus Free Time
C read/write for external I
C reads from the peripheral device do not disable the
UCLK
2
C slave devices. The MAX9257 acts as the master
is equal to one UART period.
UCLK
PARAMETER
Fully Programmable Serializer/Deserializer
2
). The I
2
C. For reads, the UART-to-I
C converts the UART packets received
______________________________________________________________________________________
2
C speed varies with UART speed.
2
C slave devices. For writes,
2
C. The UART-to-I
SYMBOL
t
t
t
t
t
2
HD:DAT
HD:STA
SU:STA
SU:DAT
SU:STO
2
t
t
t
C communication
f
HIGH
LOW
BUF
C converter that
SCL
with UART/I
2
C SCL clock
2
C converter
2
I
2
C Data Rates Greater than 400kbps
C Timing
2
2
C con-
C read
I
2
C
MIN
0.25
0.25
0.25
0.25
0.5
0.5
0.5
1
1
I
bit clock. The I
can range from 95kbps to 4.25Mbps. The I
requirements scale linearly from fast mode to higher
speeds. Table 31 shows the I
data rates greater than 400kbps. The I
scale with t
The MAX9257/MAX9258 have built-in circuits for testing
bit errors on the serial link. The MAX9257 has a PRBS
generator and the MAX9258 has a PRBS checker. The
length of the PRBS pattern is programmable from 2
2
REG9[7:4] in the MAX9257. In case of errors, errors are
counted in the MAX9258 PRBSERR register (REG12),
and the ERROR output on the MAX9258 goes low. To
start the test, the ECU writes a 1 to PRBSEN bit of both
the MAX9257 and the MAX9258. The PRBS test can be
2
35
C. The SCL and SDA timings are based on the UART
word length or continuous by programming
2
UCLK
TYP
0.25
0.25
0.25
0.25
C Control Channel
0.5
0.5
0.5
1
1
2
C data rate is determined by UART and
Applications Information
. See Figure 30 for timing parameters.
MAX
2
C timing information for
2
C parameters
PRBS Test
t
t
t
t
t
t
t
t
t
UNIT
UCLK*
UCLK
UCLK
UCLK
UCLK
UCLK
UCLK
UCLK
UCLK
2
C timing
21
37
to