RT9173CPSP

Overview

The RT9173CPSP is a high-speed linear regulator designed for DDR memory termination. It actively sinks or sources up to 2A while regulating output voltage within 40mV accuracy. The device supports SSTL_2, SSTL_18, HSTL, SCSI-2, and SCSI-3 interfaces. It features integrated power MOSFETs, current limiting protection, and on-chip thermal protection. The component operates with no VIN and VCNTL power sequence issues and includes a shutdown function for suspend-to-RAM applications. It is housed in an SOP-8 package with an exposed pad.

Feature Summary

• Capable of actively sinking and sourcing up to 2A continuous current for precise voltage regulation
• Generates termination voltages compliant with SSTL_2, SSTL_18, HSTL, SCSI-2, and SCSI-3 interface standards
• Includes integrated power MOSFETs, current limiting protection, and on-chip thermal shutdown
• Supports suspend-to-RAM functionality via a shutdown pin that creates a high-impedance output state

Applications

• DDR-I, DDR-II, and DDR-III memory system termination
• Graphics card memory termination circuits
• Desktop PCs, notebooks, and workstations
• Set-top boxes and digital TVs
• Active termination buses in embedded systems

Procurement Notes

Verify the specific suffix CPSP corresponds to the SOP-8 exposed pad package configuration. Confirm RoHS compliance and lead-free status as stated in official documentation. Ensure the ordering part number matches the exact electrical specifications required for your DDR termination design. Cross-reference with manufacturer datasheets to validate pinout and thermal characteristics before finalizing procurement.

Selection Notes

Select this component when designing termination circuits for DDR memory interfaces requiring high current capability and tight voltage accuracy. It is suitable for applications needing active sink/source regulation to maintain signal integrity. Consider the SOP-8 exposed pad package for thermal management requirements. Verify compatibility with specific interface standards like SSTL or HSTL used in the target system architecture.

Part Context

The RT9173C series from Richtek Technology Corporation is specialized for generating termination voltages in double data rate memory systems. This family addresses JEDEC SSTL and HSTL interface requirements. The CPSP variant denotes the specific packaging and tape-and-reel configuration available through distributors. It is part of Richtek's broader portfolio of power management solutions for consumer electronics and computing platforms.

Replacement Considerations

The RT9173CS is listed as a similar part number with comparable bus termination regulator functions. Verify pinout compatibility and current ratings before substitution. Check if alternative packages meet the thermal and spatial constraints of the existing design. Ensure the replacement maintains support for the required DDR generations and interface standards.

FAQ

What interface standards does the RT9173CPSP support?

It supports SSTL_2, SSTL_18, HSTL, SCSI-2, and SCSI-3 interface requirements.

How does the device handle power sequencing between VIN and VCNTL?

There is no power sequence issue between the VIN and VCNTL pins.

What protection features are integrated into the RT9173CPSP?

It includes current limiting protection and on-chip thermal protection.