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Home > Products > Integrated Circuits (ICs) > Logic > Specialty Logic

Renesas SSTUAF32868AHLFT

Name: SSTUAF32868AHLFT
Brand: Renesas
SKU: SSTUAF32868AHLFT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SSTUAF32868AHLFT

Manufacturer:: Renesas

Category:: Specialty Logic

Package:: 176-TFBGA

Datasheet:: SSTUAF32868AHLFT.pdf

Description:: IC REGIST BUFF 25BIT DDR2 176BGA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SSTUAF32868AHLFT from Renesas Electronics is a 28-bit 1:2 configurable registered buffer with parity checking, designed for DDR2 RDIMM applications operating at 1.7–1.9 V. It supports SSTL_18 I/O, features differential CLK/CLK inputs, LVCMOS RESET/CSGEN/C control, and delivers edge-controlled outputs optimized for unterminated DIMM loads. Used in DDR2 memory modules supporting 400/533/667 MT/s data rates.

For engineers reviewing the SSTUAF32868AHLFT datasheet, SSTUAF32868AHLFT pinout, SSTUAF32868AHLFT application, or SSTUAF32868AHLFT equivalent, key selection criteria include DDR2 register-A/B configuration (C input), QERR open-drain error reporting latency (n+2 clock cycles), low-power standby gating via DCS0/DCS1/CSGEN, and 176-ball LFBGA package compatibility with JEDEC DDR2 RDIMM layouts.

Technical Context

The SSTUAF32868AHLFT implements dual-register architecture (Register-A when C = 0, Register-B when C = 1), with asynchronous LVCMOS RESET that forces all Qn outputs low and disables differential receivers. Its parity logic accepts PAR_IN one cycle after data and asserts QERR two cycles after registration-latched low for ≥2 clocks or until RESET deasserts.

It operates with differential clocking (CLK/CLK crossing), supports low-power mode when CSGEN, DCS0, and DCS1 are high, and gates Qn outputs during chip-select idle while allowing QCS0/QCS1/QCKE/QODT outputs to remain active regardless of DCS state-enabling independent command/address and timing signal buffering in DDR2 RDIMMs.

Key Specifications

Parameter	Value and Actual Design Meaning
VDD Supply	1.7 V to 1.9 V - Enables compatibility with DDR2 1.8 V nominal systems and reduces power vs. 2.5 V buffers.
Max Clock Frequency	410 MHz - Supports DDR2-800 (400 MHz clock) with margin for timing closure in high-speed DIMM designs.
Propagation Delay (CLK→Qn)	1.3–1.9 ns - Ensures tight skew control across 28-bit data paths critical for DDR2 timing budgets.
QERR Latency	2 clock cycles after data registration - Enables early parity error detection without blocking subsequent data flow.
Input Compatibility	SSTL_18 on D1–D28/DCS/CLK/CLK; LVCMOS on RESET/CSGEN/C - Allows direct interface to DDR2 controller and discrete logic control lines.
Parity Logic	Even-parity check across DIMM-independent D-inputs (configurable per C state); QERR active-low open-drain - Integrates error signaling into standard DIMM fault monitoring circuits.
Operating Temperature	0°C to +70°C - Qualified for commercial-grade DDR2 memory module environments.

Pinout & Package

Package: 176-ball Low-Profile Fine-Pitch Ball Grid Array (LFBGA), lead-free, RoHS-compliant. Thermal impedance θ_JA = 40.4°C/W (0 m/s airflow).

Pin/Terminal	Circuit Role	Design Meaning
CLK / CLK	Differential master clock inputs	Edge-triggered on rising CLK/falling CLK crossing; defines all register sampling points and output timing.
RESET	Asynchronous LVCMOS reset	Forces all Qn outputs low and disables differential receivers; must be held low during power-up for glitch-free initialization.
C	Configuration control input	Hardwired low/high to select Register-A (D1–D5,D7,D9–D12,D17–D28) or Register-B (D1–D12,D17–D20,D22,D24–D28) pin mapping.
PAR_IN	SSTL_18 parity input	Arrives one clock cycle after corresponding data; enables real-time even-parity validation across selected D-inputs.
QERR	Open-drain error output	Active-low, latched for ≥2 clocks on error; compatible with standard DIMM fault-bus pull-up networks.
VREF (A1/V1)	Reference voltage input	Internally tied (~150 Ω); only one pin requires external 0.9 V supply; unused pin terminated with coupling capacitor.

Key Features

Feature	Design Value
28-bit 1:2 registered buffering	Redrives DDR2 address/command/data to two independent DIMM ranks with cycle-aligned timing and minimal skew.
Configurable register mapping (C input)	Enables hardware-selectable I/O grouping for flexible DDR2 RDIMM layout-no firmware change required.
Integrated parity checking with QERR	Eliminates need for external parity logic; supports JEDEC-compliant error reporting in server-grade memory modules.
Low-power standby gating	Disables Qn output transitions when DCS0/DCS1/CSGEN all high-reducing dynamic power during rank-idle periods.
SSTL_18 I/O compliance	Guarantees interoperability with DDR2 SDRAM, controllers, and termination schemes without level-shifting.

Applications

DDR2 Registered DIMM (RDIMM)	Server Memory Module
Use Scenario: Buffering address, command, and data signals from memory controller to dual-rank DDR2 SDRAM on a 240-pin RDIMM. IC Role / Device Role / Timing Role: Acts as a 1:2 registered repeater with parity validation, synchronizing signals across ranks using differential CLK/CLK and managing chip-select gating. Use Value: Enables stable 667 MT/s operation with deterministic timing, reduced signal integrity risk, and built-in error detection for mission-critical server platforms.	Use Scenario: Implementing fault-tolerant memory subsystems in enterprise rack servers requiring ECC and parity-aware DIMM management. IC Role / Device Role / Timing Role: Provides QERR-driven parity error flagging to platform management controllers (e.g., BMC), synchronized to DDR2 clock domain with n+2 latency. Use Value: Reduces system-level debug time by localizing parity faults to specific DIMM channels before data corruption propagates.
DDR2 Memory Subsystem Validation	Industrial Embedded DDR2 Module
Use Scenario: Reference design for DDR2 RDIMM compliance testing per JEDEC JESD79-2E, including setup/hold, propagation delay, and QERR timing validation. IC Role / Device Role / Timing Role: Serves as golden timing reference for test fixtures-leveraging guaranteed tSU/tH (0.5–0.7 ns) and tPDM (1.3–1.9 ns) specs. Use Value: Accelerates lab verification by eliminating external timing adapters and providing production-testable, datasheet-guaranteed margins.	Use Scenario: Memory expansion in ruggedized industrial controllers where thermal stability and long-term supply continuity are critical. IC Role / Device Role / Timing Role: Delivers commercial-grade (0°C to +70°C) DDR2 buffering with robust RESET sequencing and floating-input tolerance during power transitions. Use Value: Ensures reliable boot and runtime operation in uncontrolled ambient environments without requiring custom power-rail sequencing.

DDR2 Registered DIMM (RDIMM)

Server Memory Module

Use Scenario: Buffering address, command, and data signals from memory controller to dual-rank DDR2 SDRAM on a 240-pin RDIMM.

IC Role / Device Role / Timing Role: Acts as a 1:2 registered repeater with parity validation, synchronizing signals across ranks using differential CLK/CLK and managing chip-select gating.

Use Value: Enables stable 667 MT/s operation with deterministic timing, reduced signal integrity risk, and built-in error detection for mission-critical server platforms.

Use Scenario: Implementing fault-tolerant memory subsystems in enterprise rack servers requiring ECC and parity-aware DIMM management.

IC Role / Device Role / Timing Role: Provides QERR-driven parity error flagging to platform management controllers (e.g., BMC), synchronized to DDR2 clock domain with n+2 latency.

Use Value: Reduces system-level debug time by localizing parity faults to specific DIMM channels before data corruption propagates.

DDR2 Memory Subsystem Validation

Industrial Embedded DDR2 Module

Use Scenario: Reference design for DDR2 RDIMM compliance testing per JEDEC JESD79-2E, including setup/hold, propagation delay, and QERR timing validation.

IC Role / Device Role / Timing Role: Serves as golden timing reference for test fixtures-leveraging guaranteed tSU/tH (0.5–0.7 ns) and tPDM (1.3–1.9 ns) specs.

Use Value: Accelerates lab verification by eliminating external timing adapters and providing production-testable, datasheet-guaranteed margins.

Use Scenario: Memory expansion in ruggedized industrial controllers where thermal stability and long-term supply continuity are critical.

IC Role / Device Role / Timing Role: Delivers commercial-grade (0°C to +70°C) DDR2 buffering with robust RESET sequencing and floating-input tolerance during power transitions.

Use Value: Ensures reliable boot and runtime operation in uncontrolled ambient environments without requiring custom power-rail sequencing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR2 registered buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT SSTUF32868AHLFT	No parity checking; lacks PAR_IN and QERR functionality; otherwise identical pinout, timing, and electrical specs.	Suitable for non-ECC DDR2 modules where parity is handled externally or omitted.	Select when cost reduction is prioritized over integrated error detection and system-level fault visibility.
Renesas SSTUA32868AHLFT	Fixed Register-A configuration only (no C input); same 176-ball LFBGA, VDD range, and DDR2 timing.	Used in legacy DDR2 designs with static pin mapping; no runtime reconfiguration capability.	Choose when board layout is fixed and Register-B functionality is unnecessary-simplifies control logic.

Compared with IDT SSTUF32868AHLFT and Renesas SSTUA32868AHLFT, the SSTUAF32868AHLFT uniquely provides hardware-configurable register mapping and integrated parity error reporting-making it the only option among the three that supports both flexible I/O grouping and on-die fault detection for DDR2 RDIMMs.

Availability

SSTUAF32868AHLFT is available at Aetrix Electronics and suitable for DDR2 memory modules, server memory subsystems, and industrial embedded DDR2 applications requiring stable component supply, long-lifecycle support, and JEDEC-compliant timing performance.

Supply support for SSTUAF32868AHLFT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT markets.

The SSTUAF32868AHLFT belongs to Renesas' DDR2 registered buffer product line, engineered specifically for high-reliability RDIMM implementations in servers and storage systems requiring integrated parity and dual-rank signal integrity.

FAQ

What is the function of the C input on the SSTUAF32868AHLFT?

The C input selects between Register-A (C = 0) and Register-B (C = 1) configurations, determining which subset of D-inputs (D1–D28) feeds each output bank. It must be hardwired-not toggled during operation-as SSTUAF32868AHLFT does not support dynamic reconfiguration. This enables layout flexibility for different DDR2 RDIMM topologies without changing firmware or PCB design.

How does the QERR output behave during a parity error on the SSTUAF32868AHLFT?

When a parity error occurs, SSTUAF32868AHLFT drives QERR low two clock cycles after the erroneous data is registered and holds it latched low for at least two full clock cycles-or until RESET is asserted low. If multiple errors occur consecutively, QERR remains low for the duration of the error sequence plus two clocks, ensuring reliable capture by external monitoring circuitry.

Can the SSTUAF32868AHLFT operate without an external VREF supply?

No. SSTUAF32868AHLFT requires an external 0.9 V VREF supply connected to either A1 or V1 (not both), as its SSTL_18 inputs depend on this reference for valid VIH/VIL thresholds. Leaving VREF unconnected causes undefined input behavior and violates JEDEC SSTL_18 specifications-potentially leading to metastability or incorrect sampling of DDR2 signals.

What happens to outputs when RESET is asserted low on the SSTUAF32868AHLFT?

When RESET is driven low, SSTUAF32868AHLFT immediately forces all Qn outputs low, disables differential input receivers (allowing CLK/CLK/VREF to float), and clears all internal registers. QERR is driven high. This state persists until RESET returns high and tINACT (≥15 ns) elapses-ensuring glitch-free power-up and safe idle conditions before clock stabilization.

Is the SSTUAF32868AHLFT pin-compatible with other IDT/Renesas DDR2 registered buffers?

SSTUAF32868AHLFT shares the same 176-ball LFBGA footprint and core signal assignments (CLK/CLK, D1–D28, Q1–Q28, RESET, etc.) with IDT SSTUF32868AHLFT and Renesas SSTUA32868AHLFT, but differs in C input functionality and QERR/PAR_IN presence. It is not a drop-in replacement for parts lacking parity-board-level changes are required to route PAR_IN and connect QERR to monitoring logic.

SSTUAF32868AHLFT Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 176-TFBGA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: 1:2 Configurable Registered Buffer with Parity

Supply Voltage:: 1.7V ~ 1.9V

Number of Bits:: 28

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 176-CABGA (6x15)

SSTUAF32868AHLFT FAQ

1.How can I place an order for SSTUAF32868AHLFT through Aetrix?

Please submit a Request for Quotation (RFQ) for SSTUAF32868AHLFT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SSTUAF32868AHLFT reliable?

The price and inventory of SSTUAF32868AHLFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SSTUAF32868AHLFT is usually 5 days.

3.What payment methods are accepted for SSTUAF32868AHLFT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSTUAF32868AHLFT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SSTUAF32868AHLFT?

SSTUAF32868AHLFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SSTUAF32868AHLFT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SSTUAF32868AHLFT?

For technical support, including SSTUAF32868AHLFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSTUAF32868AHLFT requirements.

6.How does Aetrix verify that SSTUAF32868AHLFT is sourced from the original manufacturer or authorized distributors?

All SSTUAF32868AHLFT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SSTUAF32868AHLFT meets industry standards.

7.What is the process for return or replacement of SSTUAF32868AHLFT?

All SSTUAF32868AHLFT units undergo pre-shipment inspection (PSI). If there is an issue with SSTUAF32868AHLFT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SSTUAF32868AHLFT part is unused and in its original packaging.

Return procedure for SSTUAF32868AHLFT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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