MAX9257AGCM/V+T Maxim Integrated, MAX9257AGCM/V+T Datasheet - Page 39

• Manufacturer Part Number: MAX9257AGCM/V+T
• Description: Serializers & Deserializers - Serdes Prog Serializer / Deserializer
• Manufacturer: Maxim Integrated
• Type: Serializerr

Specifications of MAX9257AGCM/V+T

• Rohs: yes
• Data Rate: 840 Mbit/s
• Input Type: LVCMOS
• Output Type: LVDS
• Number Of Inputs: 18
• Number Of Outputs: 1
• Operating Supply Voltage: 1.7 V to 3.6 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: LQFP-48
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 1.71 V, 3 V

The ECU writes the sync frame, 7-bit device address plus
read/write bit (R/W = 1 for read), 8-bit register address,
and number of bytes to be read. The addressed device
responds with read data bytes
delay is maximum 4 bit times when reading from the
MAX9257A or the MAX9258A.
Up to two high bit times are allowed between frames.
A high time ranging from 14 UART bit times or more
resets the packet boundary. In this case, the next frame
received is assumed to belong to a new packet by
the MAX9257A/MAX9258A and UART-to-I
Resetting the boundary is required. Not resetting the
boundary treats the following packets as part of the first
packet, and they may be processed incorrectly.
The control channel data rate in base mode is between
95kbps to 4.25Mbps
allowed data rate is DC to 10Mbps
rates faster than 4.25Mbps in bypass mode, REG8[5]
in MAX9257A and REG7[5] in MAX9258A must be set
high. Set the control channel data rate in base mode by
writ ing to REG8[1:0] in the MAX9257A and REG7[1:0] in
the MAX9258A. These write commands take effect in the
next control channel.
Programming the FAST bit takes effect in the same con-
trol channel. Both the MAX9257A and the MAX9258A
should have the same settings for FAST. It is recom-
mended to first program the FAST bit in the MAX9257A.
Programming FAST to 1 results in shorter UART pulses
on the differential link.
The MAX9257A/MAX9258A have device addresses that
can be programmed to any 7-bit address.
shows the default addresses.
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Device Address Programming
Fully Programmable Serializer/Deserializer
(Table
MAX9257A/MAX9258A
Reset of Packet Boundary
28). In bypass mode, the
(Figure
Time Between Frames
(Table
29). UART read
2
Read Packet
29). For data
Data Rate
C converter.
with UART/I
Table 30
Figure 29. UART Read Packet
Table 28. Control Channel Data Rate in
Base Mode
Table 29. Control Channel Data Rate in
Bypass Mode
Table 30. Default Device Address
SYNC
MAX9257A
MAX9258A
MAX9257A REG8[1:0]
MAX9258A REG7[1:0]
MAX9257A REG8[5]
MAX9258A REG7[5]
MAX9257A/MAX9258A
DEVICE
DEV ADDR +
R/W
2
00
01
10
11
0
1
C Control Channel
REG ADDRESS
1111 1010
1111 1000
BINARY
NUMBER OF BYTES
DEFAULT
4.25Mbps–10Mbps
1Mbps–4.25Mbps
1Mbps–4.25Mbps
95kbps–400kbps
400kbps–1Mbps
DC–4.25Mbps
(default)
RANGE
RANGE
BYTE 1
0xFA
HEX
0xF8
BYTE N