Input Equalization (EQ0A, EQ1A, EQ0B, EQ1B)
The MAX14980 features control logic inputs (EQ0A,
EQ1A, EQ0B, EQ1B) to enable input equalization on
each channel, providing 3dB of boost (see Note 4 in
the Electrical Characteristics table). Drive EQ_ high to
enable input equalization. Drive EQ_ low to disable input
equalization (see Table 3). EQ0A, EQ1A, EQ0B, and
EQ1B have internal pulldown resistors of 70kΩ (typ).
Output Preemphasis (PE0A, PE1A, PE0B, PE1B)
The MAX14980 features control logic inputs (PE0A,
PE1A, PE0B, PE1B) to enable output preemphasis on
either channel, providing 3dB of boost. The MAX14980
true preemphasis, the transition signal, is increased after
a changing bit, thus increasing the total energy content
of the signal when employed. Drive PE_ high to enable
output preemphasis. Drive PE_ low to disable output pre-
emphasis (see Table 4). PE0A, PE1A, PE0B, and PE1B
have internal pulldown resistors of 70kΩ (typ).
Applications Information
Exposed Pad Package
The exposed pad, 42-pin TQFN package incorporates
features that provide a very low thermal resistance path
for heat removal from the IC. The exposed pad on the
MAX14980 must be soldered to GND for proper thermal
and electrical performance. For more information on
exposed paddle packages, refer to Maxim Application
Note HFAN-08.1: Thermal Considerations of QFN and
Other Exposed-Paddle Packages.
Layout
Use controlled-impedance transmission lines to interface
with high-speed inputs and outputs of the MAX14980.
Place 2.2µF and 0.01µF power-supply bypass capacitors
as close as possible to VCC, recommended on each VCC
pin.
Power-Supply Sequencing
Caution: Do not exceed the absolute maximum rat-
ings because stresses beyond the listed ratings can
cause permanent damage to the device.
Proper power-supply sequencing is recommended for all
devices. Always apply VCC before applying signals, espe-
cially if the signal is not current limited.
Table 3. Input Equalization (EQ0_, EQ1_)
Table 4. Output Preemphasis (PE0_, PE1_) +Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
EQ1_ EQ0_ CHANNEL 1_
(dB)
CHANNEL 0_
(dB)
0 0 0 0
0 1 0 3 (typ)
1 0 3 (typ) 0
1 1 3 (typ) 3 (typ)
PE1_ PE0_ CHANNEL 1_
(dB)
CHANNEL 0_
(dB)
0 0 0 0
0 1 0 3 (typ)
1 0 3 (typ) 0
1 1 3 (typ) 3 (typ)
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
42 TQFN-EP T423590M+1 21-0181 90-0079
PART PIN-PACKAGE TEMP RANGE
MAX14980ETO+ 42 TQFN-EP* -40°C to +85°C
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
Chip Information
PROCESS: BiCMOS
Ordering Information
MAX14980 Ruggedized Quad SAS/SATA Redriver/Equalizer
with Extended Operating Temperature
www.maximintegrated.com Maxim Integrated
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