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PDF VSC7173 Data sheet ( Hoja de datos )
| Número de pieza | VSC7173 | |
| Descripción | Enhanced 2:1 Port Selector and 1:2 Port Multiplier | |
| Fabricantes | Maxim Integrated Products | |
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Revision 4.1
May 23, 2005
Confidential
www.DataSheet4U.com
VSC7173 Data Sheet
Enhanced 2:1 Port Selector and 1:2 Port Multiplier for Serial ATA and Serial Attached SCSI
FEATURES
● 2:1 port selector and 1:2 port multiplier for both
Serial ATA (SATA) and Serial Attached SCSI
(SAS) links
● Serial ATA 1.0 compliant at 1.5 Gbps
(3.0 Gbps capable)
● Passes Serial ATA patterns transparently
● Programmable receiver sensitivity
● High output swing mode with pre-emphasis
● Compatible with VSC7175 and VSC7177 designs
● 0.7 W power dissipation
● 3.3 V power supply
● 32-pin, 7 mm x 7 mm QFP-N package
APPLICATIONS
● Active-passive redundant failover systems
● Dual-port Serial ATA and Serial Attached SCSI
disk arrays (JBODs)
● NAS servers
● RAID subsystems
● Disk-based backup systems
● Serial ATA and Serial Attached SCSI routing
applications
● Buffers for externally connected links
● Serial ATA port replicators
● Serial ATA Host Bus Adapters selecting between
internal and external connectors
To order the VSC7173 device, see “Ordering Information,” page 17.
GENERAL DESCRIPTION
The VSC7173 is a Serial ATA and Serial Attached SCSI multiplexer and buffer that implements a 2:1 port selector
function for 1.5 Gbps and 3.0 Gbps links. This function is used when dual hosts, such as I/O controllers, must access
single-port disk drives in high availability storage subsystems where redundancy and load sharing are important. The
outputs from the I/O controllers are multiplexed to a Serial ATA or Serial Attached SCSI drive. The output from the
Serial ATA drive is buffered and replicated to the I/O controllers. When switching from one I/O controller to the
other, a Serial ATA link must be re-initialized with out-of-band (OOB) signals, which are transferred through the
VSC7173 transparently. The VSC7173 provides high output swings with pre-emphasis, and programmable receiver
sensitivity that are needed to drive long backplanes and external cables.
In addition to the above features, the VSC7173 also supports a 1:2 port multiplier mode where one host can connect
two drives.
Port connectivity for the device is configured by driving external I/O pins. See the block diagram on page 2.
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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VSC7173
Data Sheet
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Reset State
The power-up state of the VSC7173 is based on the PORTSEL0 and PORTSEL1 input signals. When in level-
sensitive mode, the active port connected to port 2 is controlled directly by the PORTSEL0 input. This is the same
behavior as the normal operating condition described above. When in edge-sensitive mode, the active port connected
to port 2 is defined in Table 3. The state diagram in Figure 3 indicates the same result in a different format.
Table 3. Power-up State (Edge-Sensitive Mode)
PORTSEL0
0
1
0
1
PORTSEL1
0
0
1
1
Active Port
Port 0 selected
Port 0 selected
Port 1 selected
Port 0 selected
P0SLTD Output
1
1
0
1
Reset=1
Reset State
Reset=1
(PORTSEL0=1, PORTSEL1=1
or PORTSEL1=0)
and Reset=0
PORTSEL0=0, PORTSEL1=1
and Reset=0
Port 0 Selected
PORTSEL0
PORTSEL1
Port 1 Selected
Figure 3. Reset State Machine (Edge-Sensitive Mode)
5 of 17
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VSC7173
Data Sheet
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Operating Conditions
Table 11. Recommended Operating Conditions
Symbol
VDD
T
Parameter
Power supply voltage
Operating temperature(1)
Minimum
3.0
0
Typical
3.3
Maximum
3.6
+90
1. Lower limit of specification is ambient temperature, and upper limit is case temperature.
Unit
V
°C
Maximum Ratings
Table 12. Absolute Maximum Ratings
Symbol
VDD
VINT
VOUTT
IOT
VINS
VOUTS
IOS
TS
VESD
Parameter
Power supply voltage
LVTTL input voltage
LVTTL output voltage
LVTTL output current
Serial input voltage
Serial output voltage
Serial output current
Storage temperature
Electrostatic voltage discharge, human body model
Minimum
–0.5
–0.5
–0.5
–50
–0.5
–0.5
–50
–65
–4000
Maximum
+4.0
VDD + 0.5
VDD + 0.5
+50
VDD + 0.5
VDD + 0.5
+50
+140
+4000
Unit
V
V
V
mA
V
V
mA
°C
V
Stresses listed under Maximum Ratings may be applied to devices one at a time without causing permanent damage. Functionality at or above the values listed is
not implied. Exposure to these values for extended periods may affect device reliability.
ELECTROSTATIC DISCHARGE
This device can be damaged by ESD. Maxim recommends that all integrated circuits
be handled with appropriate precautions. Failure to observe proper handling and
installation procedures may adversely affect reliability of the device.
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| PDF Descargar | [ Datasheet VSC7173.PDF ] | |
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