Revision 4.1
January 2008
VSC056 Data Sheet
Enhanced Two-Wire Serial Backplane Controller
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Up to 16 subaddressed Master mode two-wire serial
interface ports
FEATURES
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Up to 64 bits of user-definable, bidirectional
general-purpose inputs and outputs
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External reset of the slave two-wire serial core
Enhanced fan speed monitor input filters
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Integrated port bypass, clock recovery and signal
detect support for up to 16 drives
20% of package pins are power and ground for
excellent noise immunity and long-term reliability
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Eight programmable fan speed monitoring inputs
Eight programmable pulse-width modulated fan
control outputs
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Up to 32 programmable input-to-output bypass pairs
Two clock input ranges: 8.0 MHz to 12.5 MHz
(external crystal or external clock source) and
32.0 MHz to 75.0 MHz (external clock source)
APPLICATIONS
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Enterprise storage environments
Storage Area Network (SAN) appliances
Network Attached Storage (NAS) systems
Fabric Attached Storage (FAS) systems
Rack-mounted servers with RAID
JBOD arrays
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Selectable direct LED drive flashing capability
Pin-programmable addressing for up to 16 devices
on a single serial bus
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5-V tolerant high current I/O, Slave mode two-wire
serial interface and interrupt output
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Ten programmable LED pulse train circuits
Disk-based backup storage
One 24-bit general-purpose timer (supports a
timeout greater than four seconds with a 12.5 MHz
core clock)
Near-line storage replacement systems
Fixed-content storage systems
To order the VSC056 device, see “Ordering Information,” page 134.
GENERAL DESCRIPTION
The VSC056 device is an I/O-intensive peripheral device that is intended to be part of a cost-effective Fibre Channel
Arbitrated Loop (FC-AL), Small Computer System Interface (SCSI), Serial Attached SCSI (SAS), or Serial ATA
(SATA) enclosure management solution. The device contains an address-programmable two-wire serial interface, a
block of control and status registers, I/O port control logic, specialized port bypass control logic, and a clock-
generation block.
Along with an external crystal, the device can be configured to support up to 64 bits of general-purpose I/O; or 16 bits
of general-purpose I/O, 32 bits of port bypass control (16 pairs supporting 16 drives), eight fan speed monitoring
inputs, and eight pulse-width modulated general-purpose control outputs.
The VSC056 supports various combinations of individual port bypass circuit (PBC), clock recovery unit (CRU), and
signal detect unit (SDU) functions, as well as integrated solutions. The control register portion of the device allows
the user to individually program each I/O pin as an input, an output, or an open-drain or open-source output.
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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