Winbond Electronics Corporation W9864G6JB-6I

Overview

W9864G6JB-6I from Winbond is a 1M × 4 banks × 16-bit synchronous DRAM (SDRAM) operating at 166 MHz with CAS Latency 3, 3.3V ±0.3V supply, and industrial temperature range (–40°C to +85°C). It delivers up to 166 million words/second bandwidth and supports burst lengths of 1, 2, 4, 8, or full page for high-throughput memory buffering in embedded controllers and display subsystems.

For engineers reviewing the W9864G6JB-6I datasheet, W9864G6JB-6I pinout, W9864G6JB-6I application, or W9864G6JB-6I equivalent, key selection criteria include its VFBGA-60 package, LVTTL interface compatibility, self-refresh capability, programmable mode register, and industrial-grade thermal reliability for long-lifecycle industrial HMI and network edge devices.

Technical Context

This SDRAM implements four independent 1M-word banks with interleaved access to hide precharge latency. Its command decoder synchronizes all operations-including Bank Activate, Read/Write, Auto-precharge, and Self Refresh-to the rising edge of CLK, with CKE enabling/disabling clock domain entry into Power Down or Clock Suspend modes.

The device uses multiplexed address pins (A0–A11) for row/column addressing, BS0/BS1 for bank selection, and UDQM/LDQM for per-byte write masking and output tri-state control. Mode Register configuration defines burst type (sequential/interleave), length, and CAS latency-enabling optimization for sequential streaming or random-access patterns in real-time video frame buffers.

Key Specifications

Pinout & Package

VFBGA-60 package (6.4 mm × 10.1 mm, 0.65 mm ball pitch, lead-free RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with W9864G6JB-6I, IS42S16100E-6BLI trades package compactness for assembly flexibility, while MT48LC16M16A2P-6A:G increases capacity at the cost of non-interchangeable timing and initialization-neither offers pin-to-pin or functional drop-in replacement without hardware or software adaptation.

Availability

W9864G6JB-6I is available at Aetrix Electronics and suitable for industrial HMI, network edge infrastructure, medical imaging subsystems, and automated test equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for W9864G6JB-6I 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, flash, and logic ICs, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The W9864G6JB series belongs to Winbond's industrial-grade SDRAM product line, designed specifically for reliable, low-power, high-bandwidth memory buffering in harsh-environment embedded systems where long-term supply stability and thermal robustness are critical.

FAQ

What is the maximum operating frequency and CAS latency of the W9864G6JB-6I?

The W9864G6JB-6I operates at a maximum clock frequency of 166 MHz with a fixed CAS latency of 3. This timing is guaranteed across its full industrial temperature range (–40°C to +85°C), and the device must be initialized via Mode Register Set to lock CL3 before normal operation. The W9864G6JB-6I does not support dynamic CAS latency switching.

Does the W9864G6JB-6I support self-refresh mode, and how is it activated?

Yes, the W9864G6JB-6I supports autonomous self-refresh mode. It is activated by asserting CS#, RAS#, CAS#, and WE# low while holding CKE low on the rising edge of CLK. Once entered, the device maintains data integrity without external clocks or commands for the duration of the 64 ms refresh interval, exiting only when CKE is returned high and tXSR delay is observed. The W9864G6JB-6I draws ≤2 mA in this state.

What package type and ball count does the W9864G6JB-6I use?

The W9864G6JB-6I uses a VFBGA-60 package measuring 6.4 mm × 10.1 mm with 0.65 mm ball pitch and 0.4 mm ball diameter. It is lead-free and RoHS compliant. Ball assignments include 12 address pins (A0–A11), 16 data I/Os (DQ0–DQ15), dual DQM lines, four command strobes (CS#, RAS#, CAS#, WE#), CLK, CKE, two bank selects (BS0/BS1), and dedicated VDD/VSS/VDDQ/VSSQ supplies.

How does auto-precharge work on the W9864G6JB-6I, and what is the role of A10?

Auto-precharge on the W9864G6JB-6I is triggered when A10 is driven high during a Read or Write command. This causes the active bank to begin precharging automatically before burst completion-reducing command overhead. For reads, precharge starts tCL clocks before burst end; for writes, it begins two clocks after final data input (tWR). The W9864G6JB-6I requires tRP ≥ 18 ns after auto-precharge initiation before reactivation.

Is the W9864G6JB-6I compatible with standard LVTTL logic levels?

Yes, the W9864G6JB-6I uses LVTTL-compatible input thresholds and drive strengths: VIH = 2.0 V min, VIL = 0.8 V max, VOH = VDD–0.4 V min, VOL = 0.4 V max at IOH/IOL = ±20 µA. Its VDDQ-supplied DQ outputs and VDD-supplied command/address inputs meet JEDEC Standard No. 15 for 3.3V SDRAM, ensuring interoperability with common microcontrollers, FPGAs, and ASICs without level shifters.