SN74SSTU32866ZKER

Specialty Logic Overview

The SN74SSTU32866GKER is a Widebus+ registered buffer designed for DDR2 DIMM applications. It operates at VCC = 1.7V to 1.9V and accepts SSTL_18 data inputs with LVCMOS control signals. The device supports differential clock inputs (CLK, CLK) and registers data on the rising edge of CLK and falling edge of CLK. It features configurable pinouts: 25-bit 1:1 or 14-bit 1:2 (Register A/B). It includes parity checking on DIMM-independent data inputs, outputting errors via an open-drain QERR pin. Chip-select inputs (DCS, CSR) gate outputs to minimize power consumption.

Specialty Logic Feature Summary

• Configurable as a 25-bit 1:1 or 14-bit 1:2 registered buffer to optimize DDR2 DIMM PCB layout.
• Supports SSTL_18 data inputs and LVCMOS control/reset inputs with differential clock operation.
• Checks parity on DIMM-independent data inputs and indicates errors via an active-low open-drain QERR output.
• Chip-select inputs (DCS, CSR) gate data outputs from changing state to minimize system power consumption.

Specialty Logic Applications

• DDR2 Registered DIMM (RDIMM) memory systems
• High-speed data buffering in server memory architectures
• Parity-protected data path implementations

Specialty Logic Procurement Notes

Verify the specific ordering suffix GKER corresponds to the tape and reel packaging variant. Confirm the component meets RoHS compliance standards required for your assembly process. Ensure the design accommodates the LFBGA package thermal characteristics and pinout configuration selected via C0 and C1 hard-wired inputs.

Specialty Logic Selection Notes

Select this component when designing DDR2 memory interfaces requiring wide bus width buffering with integrated parity checking. Choose the 1:1 configuration for single-device driving or 1:2 for dual-device cascading. Ensure the system provides stable differential clocks and appropriate SSTL_18 termination voltages for reliable signal integrity.

Specialty Logic Part Context

Part of Texas Instruments' Widebus+ family, optimized for high-density memory modules. The SN74SSTU32866 addresses the need for robust data registration and error detection in modern server memory designs, replacing older discrete logic solutions with a highly integrated buffered approach.

Specialty Logic Replacement Considerations

No public confirmed substitute part numbers are documented in the provided datasheet.

Specialty Logic FAQ

How does the device handle parity errors?

The device checks parity on DIMM-independent data inputs. If an error occurs, the open-drain QERR output is driven low and latched for a minimum of two clock cycles or until RESET is asserted.

What is the function of the C0 and C1 inputs?

C0 and C1 are hard-wired configuration inputs that select between the 25-bit 1:1 mode and the 14-bit 1:2 Register A or Register B pinout configurations. They should not be switched during normal operation.