MAX9273GTL+ Maxim Integrated, MAX9273GTL+ Datasheet - Page 40

• Manufacturer Part Number: MAX9273GTL+
• Description: Serializers & Deserializers - Serdes 1.5Gbps 22-bit Coax/STP serializer
• Manufacturer: Maxim Integrated
• Type: Serializerr

Specifications of MAX9273GTL+

• Rohs: yes
• Data Rate: 1.5 Gbit/s
• Input Type: CMOS/LVCMOS
• Output Type: CML
• Number Of Inputs: 22
• Number Of Outputs: 1
• Operating Supply Voltage: 1.7 V to 3.6 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: TQFN-40 EP
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

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
Figure 34. Human Body Model ESD Test Circuit
Figure 35. IEC 61000-4-2 Contact Discharge ESD Test Circuit
Maxim Integrated
VOLTAGE
VOLTAGE
SOURCE
SOURCE
HIGH-
HIGH-
DC
DC
CHARGE-CURRENT-
CHARGE-CURRENT-
LIMIT RESISTOR
LIMIT RESISTOR
1MI
150pF
100pF
C
C
S
S
RESISTANCE
RESISTANCE
DISCHARGE
DISCHARGE
STORAGE
CAPACITOR
STORAGE
CAPACITOR
1.5kI
330I
R
R
D
D
22-Bit GMSL Serializer with Coax or
Board Layout
DEVICE
DEVICE
UNDER
UNDER
TEST
TEST
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 in parallel 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 outputs 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
1.5kI
nents are C
ISO 10605 discharge components are C
R
Figure 36. ISO 10605 Contact Discharge ESD Test Circuit
D
= 2kI
(Figure
VOLTAGE
SOURCE
HIGH-
DC
(Figure
S
= 150pF and R
CHARGE-CURRENT-
34). The IEC 61000-4-2 discharge compo-
LIMIT RESISTOR
36).
STP Cable Drive
330pF
C
S
RESISTANCE
DISCHARGE
STORAGE
CAPACITOR
D
2kI
R
= 330I
D
MAX9273
S
ESD Protection
= 100pF and R
(Figure
S
= 330pF and
DEVICE
UNDER
TEST
35). The
D
40
=