Winbond Electronics Corporation W971GG6KB-18

Overview

W971GG6KB-18 from Winbond Electronics is a 1G-bit DDR2 SDRAM organized as 8M words × 8 banks × 16 bits, supporting DDR2-1066 (7-7-7) timing at 533 MHz clock frequency with 1.8 V supply. It implements differential clock inputs (CLK/CLK), bi-directional DQS strobes, on-die termination (ODT), and off-chip driver (OCD) impedance calibration for high-signal-integrity memory subsystems in embedded networking and industrial control applications.

For engineers reviewing the W971GG6KB-18 datasheet, W971GG6KB-18 pinout, W971GG6KB-18 application, or W971GG6KB-18 equivalent, key selection considerations include its -18 speed grade compliance with DDR2-1066, 84-ball WBGA package, SSTL_18 interface, CAS latency programmability (CL=3–7), and support for auto-precharge, self-refresh, and power-down modes.

Technical Context

This DDR2 SDRAM uses a double-data-rate architecture synchronized to differential CLK/CLK inputs, with all address/control latched at clock crossings and I/Os referenced to source-synchronous DQS/DQS strobes. Its internal DLL aligns DQ and DQS transitions to clock edges, enabling precise timing at 533 MHz.

The device supports programmable additive latency (AL=0–2), burst lengths of 4 or 8, write latency = read latency − 1, and on-die termination controlled via ODT pin and extended mode registers. OCD calibration allows dynamic output driver impedance tuning for improved signal integrity across varying PCB trace conditions.

Key Specifications

Pinout & Package

W971GG6KB-18 is packaged in an 84-ball Wafer-Level Ball Grid Array (WBGA) measuring 8 mm × 12.5 mm with pitch 0.8 mm. The package separates VDDQ/VSSQ from VDD/VSS to reduce I/O noise coupling and includes dedicated DLL power (VDDL) and ground (VSSDL) pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT47H128M16HR-37E and IS42S16160F-6BLI, W971GG6KB-18 delivers highest sustained bandwidth (1066 Mb/sec/pin), integrated differential strobes, and calibrated OCD-making it optimal for new designs targeting DDR2-1066 timing margins and signal integrity in dense, thermally constrained layouts.

Availability

W971GG6KB-18 is available at Aetrix Electronics and suitable for industrial automation, network infrastructure, medical imaging, and automotive ADAS applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for W971GG6KB-18 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

Winbond Electronics is a Taiwan-based semiconductor company specializing in specialty memory solutions including NOR/NAND Flash, SRAM, and DDR SDRAM for industrial, automotive, and communications markets.

The W971GG6KB series belongs to Winbond's DDR2 SDRAM product line, designed specifically for cost-optimized, high-reliability embedded systems needing JEDEC-compliant DDR2-1066 performance in compact WBGA packages.

FAQ

What is the maximum clock frequency supported by W971GG6KB-18?

W971GG6KB-18 supports a maximum clock frequency of 533 MHz, corresponding to DDR2-1066 operation (1066 Mb/sec/pin). This is validated under the -18 speed grade with tCK(min) = 1.875 ns at CL=7, and requires strict adherence to setup/hold timing relative to CLK/CLK differential crossings.

Does W971GG6KB-18 require external termination resistors?

No, W971GG6KB-18 integrates on-die termination (ODT) controlled via the ODT pin and extended mode registers, eliminating the need for external parallel termination. However, proper VREF (VDDQ/2 ± 300 mV) must be supplied externally to ensure correct SSTL_18 input threshold referencing.

How is the burst length configured for W971GG6KB-18?

Burst length for W971GG6KB-18 is set via A[2:0] bits during the Mode Register Set (MRS) command and is programmable to either 4 or 8. The device defaults to undefined after power-up, so the MRS command must be issued during initialization to configure BL before normal operation begins.

What is the purpose of the VDDL and VSSDL pins on W971GG6KB-18?

VDDL (DLL power) and VSSDL (DLL ground) provide isolated power and ground for the internal delay-locked loop circuitry. Separating DLL supply from core VDD/VSS prevents switching noise from degrading DLL jitter performance-critical for maintaining tight DQ–DQS alignment at 533 MHz operation.

Can W971GG6KB-18 operate in self-refresh mode at 85°C case temperature?

Yes, W971GG6KB-18 is rated for self-refresh current (IDD6) ≤8 mA at TCASE ≤ 85°C, as specified in the -18 speed grade datasheet. This enables low-power retention during system sleep states without external refresh controller intervention, provided VDD/VDDQ remain within 1.8 V ± 0.1 V.