Datasheet

Maxim Integrated │ 9
www.maximintegrated.com
MAX14970 Ruggedized 6Gbps SATA Redriver with High ESD
and Extended Temperature Operation
Cable-Detect Input
The device features an active-low, cable-detect input (CAD)
for use in external SATA applications. CAD has an internal
390kI (typ) pullup resistor. Drive CAD
high or leave uncon-
nected to place the device into low-power standby mode.
In this mode, the buffers are disabled, reducing supply
current to 20FA (typ). This signal is normally driven low by
attaching a SATA cable into a properly wired socket (see
Figure 4). If the cable-detect feature is not desired, connect
CAD to GND.
Dynamic Power-Down Mode
The device features a dynamic power-down mode where
the device shuts down the major power-consuming cir-
cuitry. The device detects if the input signal is not present
for a 4Fs (typ) duration. Normal operation resumes after
20ns (max) when a signal above the OOB threshold level
is detected at the input. This function is implemented
separately for both channels. The output common mode
remains virtually unchanged when entering or exiting
dynamic power-down mode, making the device ideal for
internal SATA applications.
Output Preemphasis Selection Inputs
The device has two preemphasis control-logic inputs, PA
and PB. PA and PB have internal 390kI (typ) pulldown
resistors. PA and PB enable preemphasis to the outputs of
their corresponding buffers (see the Functional Diagram/
Truth Table). Drive PA or PB low or leave unconnected
for standard SATA output levels. Drive PA or PB high to
provide preemphasis to the output. The preemphasis out-
put signal compensates for attenuation from longer trace
lengths or to meet internal SATA specifications.
Applications Information
Figure 1 shows a typical application circuit with the MAX14970
used to drive an internal SATA SDD or HDD. Figure 4 shows
a typical application circuit with the MAX14970 used to drive
an external SATA SSD or HDD.
Figure 1. Typical Application Circuit for Internal SATA Applications
SATA HOST
CONTROLLER
INTERNAL
SATA
DEVICE
CONNECTOR
HARD DRIVE/
SOLID-STATE
DRIVE
Rx
1
5
6
7
2
3
Tx
10nF (X7R)
10nF (X7R)
AINP
AINM
BOUTM
BOUTP
AOUTP
AOUTM
BINM
BINP
CAD
Tx
Rx
10nF (X7R) 10nF (X7R)
10nF (X7R) 10nF (X7R)
10nF (X7R)
MAX14970
4
10nF (X7R)
GNDPBPA
V
CC
EN
GPIO
MODE
GPIO
+3.3V
0.01µF1µF
V
CC