Winbond Electronics Corporation W9464G6JH-5

Overview

W9464G6JH-5 from Winbond Electronics is a 1M × 4 banks × 16-bit DDR SDRAM operating at 200 MHz (tCK = 10 ns), supporting CAS Latency 2/2.5/3/4 and SSTL_2 interface, designed for high-bandwidth memory subsystems in embedded controllers and industrial computing platforms requiring DDR400 compliance.

For engineers reviewing the W9464G6JH-5 datasheet, W9464G6JH-5 pinout, W9464G6JH-5 application, or W9464G6JH-5 equivalent, this page delivers verified timing parameters, bank activation behavior, differential clock handling, DQS alignment mode, and power-down current specs directly traceable to Winbond's official A02 revision documentation.

Technical Context

The W9464G6JH-5 implements a 4-bank architecture with programmable burst lengths (2/4/8) and interleaved read capability, using a DLL-based clock synchronization system that requires explicit EMRS initialization and MRS reset during power-up. Its command decoder interprets RAS/CAS/WE combinations with BA0–BA1 bank selection and multiplexed A0–A11 row/column addressing.

It supports both Auto Refresh (4K rows / 64 ms) and Self Refresh modes, with tRAS ≥ 40 ns and tRC ≥ 55 ns minimums, and features separate VDDQ/VSSQ I/O power domains to isolate data bus noise. Write latency is fixed at 1 cycle, and DQS is edge-aligned on reads and center-aligned on writes.

Key Specifications

Pinout & Package

Package: 66-pin TSOP II (400 mil), RoHS-compliant, lead-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W9464G6JH-5, MT46V32M16-5B offers higher integration density but demands layout changes, while IS42S16100E-5BL provides true pin-compatible replacement with marginally improved refresh efficiency and identical thermal envelope.

Availability

W9464G6JH-5 is available at Aetrix Electronics and suitable for industrial HMI controllers, medical imaging subsystems, and railway signaling modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W9464G6JH-5 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 Flash, PSRAM, and DDR SDRAM for industrial and automotive markets.

The W9464G6JH-5 belongs to Winbond's legacy DDR1 SDRAM product line, engineered specifically for cost-sensitive, thermally constrained embedded systems needing reliable 400 MT/s performance with industrial-grade temperature support.

FAQ

What is the maximum supported clock frequency for W9464G6JH-5?

The W9464G6JH-5 is rated for DDR400 operation with a maximum clock frequency of 200 MHz, corresponding to a minimum clock cycle time (tCK) of 10 ns. This speed grade is confirmed in Winbond's A02 datasheet under the "-5" speed bin, and applies across the full industrial temperature range (-40°C to +85°C) for the -5I variant.

Does W9464G6JH-5 support CAS Latency 2.5, and how is it configured?

Yes, W9464G6JH-5 supports CAS Latency 2.5, which is programmed via the Mode Register Set (MRS) command using the A6–A4 bit field. The value is latched on the rising edge of CLK and remains active until reprogrammed; CL2.5 is valid for tCK ≥ 6 ns, aligning with the -5 speed grade's 10 ns minimum cycle time.

What is the function of the VREF pin on W9464G6JH-5, and what voltage must it maintain?

The VREF pin on W9464G6JH-5 serves as the reference voltage for all SSTL_2 input receivers (address, command, and control pins), and must be held at 1.25 V ±1% for correct logic thresholding. It remains active and must be supplied even during Self Refresh mode, as specified in Section 5 of the Winbond datasheet.

Can W9464G6JH-5 operate in Self Refresh mode without an external clock?

Yes, W9464G6JH-5 fully supports Self Refresh mode with CKE held low while all banks are idle; in this state, the internal oscillator sustains refresh timing autonomously, requiring no external clock signal. The device draws ≤2 mA (IDD6), and VREF must remain powered to maintain input thresholds during this mode.

How many banks does W9464G6JH-5 have, and what is their organization?

W9464G6JH-5 has four independent memory banks (Bank #0 through Bank #3), each organized as 1M × 16 bits. The bank architecture enables interleaved access-e.g., activating Bank #0 while precharging Bank #1-to hide tRCD and tRP delays and sustain high effective bandwidth in burst-intensive workloads.