SN74SSTU32866GKER

Specialty Logic Overview

The SN74SSTU32866GKER is a 25-bit 1:1 or 14-bit 1:2 configurable registered buffer designed for 1.7-V to 1.9-V VCC operation. It features SSTL_18 data inputs and LVCMOS control inputs, with edge-controlled outputs optimized for unterminated DIMM loads. The device supports differential clock inputs (CLK and CLK) and includes parity checking on DIMM-independent data inputs via the PAR_IN pin. It allows cascading with a second SN74SSTU32866 for expanded parity monitoring.

Specialty Logic Feature Summary

• Configurable as a 25-bit 1:1 or 14-bit 1:2 registered buffer
• Supports SSTL_18 data inputs and LVCMOS control levels
• Includes parity error detection and open-drain QERR output
• Enables low-power standby and active modes via chip-select inputs

Specialty Logic Applications

• DDR2 Registered DIMM (RDIMM) memory systems
• High-speed data buffering for SDRAM loads
• Parity checking circuits in memory controllers

Specialty Logic Procurement Notes

Verify the GKE package suffix corresponds to the LFBGA form factor and tape-and-reel packing. Confirm the operating temperature range matches the 0°C to 70°C specification. Ensure the design accounts for the specific pinout configurations required for 1:1 versus 1:2 modes, particularly regarding unused DNU pins.

Specialty Logic Selection Notes

Select this component when designing DDR2 RDIMMs requiring configurable bus width and integrated parity checking. It is suitable for applications needing edge-controlled outputs to minimize switching noise on unterminated lines. Consider cascading capabilities if extended parity monitoring across multiple devices is required.

Specialty Logic Part Context

Part of the Texas Instruments Widebus+ family, the SN74SSTU32866 is optimized for DDR2 DIMM PCB layout. It provides a flexible solution for memory buffering by allowing configuration between 25-bit and 14-bit widths through hard-wired C0 and C1 inputs.

Specialty Logic Replacement Considerations

SN74SSTU32866GKER