VSC7153SS-02

Overview

The VSC7153SS-02 is a multimode, user-configurable 24-PHY Serial Attached SCSI (SAS) expander supporting 1.5Gbps and 3.0Gbps data rates. It provides SAS port expansion for edge and fanout topologies using an internal nonblocking cross-bar matrix. The device integrates 24 serializer/deserializers (SerDes), per-PHY diagnostics, retiming elasticity buffers, and SMP/STP virtual PHY engines. An embedded Stanford-1 32-bit RISC CPU handles enclosure management via I²C or Ethernet interfaces. It supports table routing with up to 320 destination addresses and operates in parallel master/slave, I²C slave, or SPI master modes.

Feature Summary

• Supports independent 1.5Gbps or 3.0Gbps operation per PHY with automatic speed detection.
• Features a nonblocking switch architecture enabling any-to-any PHY connectivity.
• Integrates an embedded Stanford-1 32-bit RISC processor for local control and SES functions.
• Includes programmable output deemphasis and input signal equalization for high-speed signal integrity.

Applications

• Blade Servers
• JBOD Arrays
• Enterprise Storage Environments

Procurement Notes

This component is designated as Not Recommended for New Designs. Availability may be limited due to discontinuation status. Verify Last Time Buy eligibility before procurement planning. Confirm package variants such as the 484-pin TESBGA against specific design requirements. Ensure firmware compatibility with existing Maxim enclosure management controllers if upgrading from legacy systems.

Selection Notes

Select this expander for midrange and enterprise storage applications requiring 24-port SAS expansion. It serves as a technology upgrade for systems relying on parallel SCSI infrastructure. Consider its support for STP/SATA bridging when connecting SATA drives. Evaluate the embedded management capabilities for simplified enclosure monitoring compared to external controllers.

Part Context

The VSC7153 series represents a high-integration solution for SAS expanders within the Maxim Integrated portfolio. It combines high-speed SerDes with robust management features. The device targets environments needing scalable storage connectivity without complex external switching logic. Its architecture facilitates efficient distribution of SAS signals across disk drive arrays.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the device is marked Not Recommended for New Designs, alternative solutions should be evaluated based on port count and SAS generation support rather than direct pin-compatible replacements.