74SSTUB32865AZJBR

Specialty Logic Overview

The Texas Instruments 74SSTUB32865AZJBR is a 28-bit to 56-bit registered buffer with address-parity test, designed for 1.7V to 1.9V VCC operation. It supports SSTL_18 data inputs and LVCMOS switching levels on chip-select gate-enable and RESET inputs. The device features differential clock (CK and CK) inputs, with data registered at the crossing of CK going high and CK going low. It includes an open-drain error (PTYERR) output that indicates parity errors on DIMM-independent data inputs. The component operates within an industrial temperature range of -40°C to 85°C.

Specialty Logic Feature Summary

• Supports SSTL_18 data inputs and LVCMOS switching levels on control inputs
• Checks parity on DIMM-independent data inputs via open-drain PTYERR output
• Features edge-controlled circuits optimized for unterminated DIMM loads
• RESET input disables differential input receivers and resets all registers

Specialty Logic Applications

• DDR2 Registered Dual In-line Memory Modules (RDIMMs)
• Stacked DDR2 RDIMMs requiring up to 36 SDRAM loads per DIMM
• Memory systems utilizing Widebus+ family components

Specialty Logic Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific ordering suffix matches the required package and tape-and-reel specifications. Ensure compliance with RoHS3 standards and check for any product change notices affecting availability or assembly sites. Validate that the part number corresponds to the exact 160-NFBGA configuration required for the design.

Specialty Logic Selection Notes

Select this component for designs requiring a 28-bit to 56-bit registered buffer with address-parity testing capabilities. It is suitable for applications needing high driver strength for heavily loaded DIMMs and support for stacked memory configurations. Consider the industrial temperature range and differential clock requirements when integrating into system architectures.

Specialty Logic Part Context

This component belongs to the Texas Instruments Widebus+ family of logic devices. It is specifically engineered for memory interface applications, providing buffering and parity checking functions essential for reliable data transmission in high-speed memory systems. The device integrates both data registration and error detection mechanisms within a single package.

Specialty Logic Replacement Considerations

Public confirmed substitute part numbers: 74SSTUB32868AZRHR

Specialty Logic FAQ

How does the device handle parity errors?

The device checks parity on DIMM-independent data inputs and drives the open-drain PTYERR pin low if an error occurs. The signal stays latched low for a minimum of two clock cycles or until RESET is driven low.

What are the input voltage levels supported by the 74SSTUB32865A?

All inputs are SSTL_18, except for the chip-select gate-enable (CSGateEN) and reset (RESET) inputs, which support LVCMOS switching levels.