MAX9240GTM+ Maxim Integrated, MAX9240GTM+ Datasheet - Page 43

• Manufacturer Part Number: MAX9240GTM+
• Description: Serializers & Deserializers - Serdes 28Bit GMSL Deserializer
• Manufacturer: Maxim Integrated

Specifications of MAX9240GTM+

• Rohs: yes

Separate the LVCMOS logic signals and CML/coax high-
speed signals to prevent crosstalk. Use a four-layer PCB
with separate layers for power, ground, CML/coax, and
LVCMOS logic signals. Layout PCB traces close to each
other for a 100I differential characteristic impedance.
The trace dimensions depend on the type of trace used
(microstrip or stripline). Note that two 50I PCB traces
do not have 100I differential impedance when brought
close together—the impedance goes down when the
traces are brought closer. Use a 50I trace for the single-
ended output when driving coax.
Route the PCB traces for differential CML channel in par-
allel to maintain the differential characteristic impedance.
Avoid vias. Keep PCB traces that make up a differential
pair equal length to avoid skew within the differential pair.
ESD tolerance is rated for Human Body Model, IEC
61000-4-2, and ISO 10605. The ISO 10605 and IEC
61000-4-2 standards specify ESD tolerance for electronic
systems. The serial link inputs are rated for ISO 10605
ESD protection and IEC 61000-4-2 ESD protection. All
pins are tested for the Human Body Model. The Human
Body Model discharge components are C
R
components are C
The ISO 10605 discharge components are C
and R
Maxim Integrated
D
= 1.5kI
6.25MHz to 100MHz, 25-Bit GMSL Deserializer for
D
= 2kI
(Figure
(Figure
S
= 150pF and R
Coax or STP Cable With Line Fault Detect
32). The IEC 61000-4-2 discharge
34).
D
= 330I
ESD Protection
Board Layout
S
= 100pF and
(Figure
S
= 330pF
33).
Figure 32. Human Body Model ESD Test Circuit
Figure 33. IEC 61000-4-2 Contact Discharge ESD Test Circuit
Figure 34. ISO 10605 Contact Discharge ESD Test Circuit
VOLTAGE
VOLTAGE
VOLTAGE
SOURCE
SOURCE
SOURCE
HIGH-
HIGH-
HIGH-
DC
DC
DC
CHARGE-CURRENT-
CHARGE-CURRENT-
CHARGE-CURRENT-
LIMIT RESISTOR
LIMIT RESISTOR
LIMIT RESISTOR
1MI
150pF
100pF
330pF
C
C
C
S
S
S
RESISTANCE
RESISTANCE
RESISTANCE
DISCHARGE
DISCHARGE
DISCHARGE
STORAGE
CAPACITOR
STORAGE
CAPACITOR
STORAGE
CAPACITOR
1.5kI
330I
2kI
R
R
R
D
D
D
MAX9240
DEVICE
UNDER
DEVICE
UNDER
DEVICE
UNDER
TEST
TEST
TEST
43