Winbond Electronics Corporation W9464G6KH-5 TR

Overview

W9464G6KH-5 TR from Winbond is a 1M × 4 banks × 16-bit DDR SDRAM operating at 200 MHz with 2.5V ±0.2V supply, CAS latency options of 2/2.5/3, and SSTL_2 interface - designed for high-bandwidth memory subsystems in embedded controllers, industrial HMIs, and legacy PC-compatible platforms requiring DDR400/CL3 compliance.

For engineers reviewing the W9464G6KH-5 TR datasheet, W9464G6KH-5 TR pinout, W9464G6KH-5 TR application, or W9464G6KH-5 TR equivalent, key selection considerations include its TSOP-II 66-pin package, 7.5–10 ns clock cycle (tCK), 40 ns tRAS, 55 ns tRC, and support for auto/self-refresh with 2 mA standby current.

Technical Context

This DDR SDRAM implements double-data-rate architecture synchronized to both edges of DQS, with differential CLK/CLK inputs and edge-aligned read data / center-aligned write data. It uses a programmable Mode Register to configure burst length (2/4/8), addressing mode (sequential/interleave), and DLL reset state.

The device integrates four independent banks, each with row/column decoders, sense amplifiers, and prefetch registers. Its power management includes precharge power-down, active power-down, and self-refresh modes - all controlled via CKE, CS, RAS, CAS, and WE command decoding with strict timing constraints including tRFC ≥ 70 ns and tREFI = 64 ms.

Key Specifications

Pinout & Package

W9464G6KH-5 TR is housed in a RoHS-compliant, lead-free TSOP-II 66-pin package (13.0 mm × 20.0 mm × 1.2 mm height) with separate VDD/VDDQ and VSS/VSSQ rails for logic and I/O noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT46V64M16P-5B:J and IS42S16640B-5TL, W9464G6KH-5 TR offers the lowest self-refresh current (2 mA) and full CL flexibility in a proven TSOP-II form factor - making it optimal for cost-sensitive, thermally constrained, or long-lifecycle industrial designs where footprint stability is critical.

Availability

W9464G6KH-5 TR is available at Aetrix Electronics and suitable for industrial HMIs, legacy PC embedded controllers, and network appliance packet buffers requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for W9464G6KH-5 TR 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 computing markets.

The W9464G6KH series belongs to Winbond's DDR1 SDRAM product line, engineered for backward-compatible DDR400 systems where reliability, temperature stability, and pinout consistency outweigh next-generation bandwidth requirements.

FAQ

What is the operating temperature range for W9464G6KH-5 TR?

W9464G6KH-5 TR is rated for commercial temperature operation from 0°C to +70°C. This distinguishes it from the industrial-grade W9464G6KH-5I variant, which supports –40°C to +85°C. The -5 suffix explicitly denotes the commercial speed grade, and thermal derating of AC parameters must follow the datasheet's recommended DC operating conditions across this range.

Does W9464G6KH-5 TR support DLL reset and how is it configured?

Yes, W9464G6KH-5 TR supports DLL reset via bit A8 in the Mode Register Set (MRS) command. When A8 = 1 during MRS, the DLL is reset; when A8 = 0, DLL reset is disabled. A minimum of 200 clock cycles after DLL reset is required before issuing a Read command to ensure lock stability - a mandatory step in the documented power-up initialization sequence.

Can W9464G6KH-5 TR be used in systems requiring CL=2.5 latency?

Yes, W9464G6KH-5 TR fully supports CAS Latency 2.5 as specified in its features and KEY PARAMETERS table. CL=2.5 is selected by programming A6–A4 = 010 in the Mode Register. This setting yields a tCK min of 6 ns at CL=2.5, enabling tighter timing margins than CL=3 while retaining greater setup margin than CL=2 in marginal signal integrity environments.

What is the function of the VREF pin on W9464G6KH-5 TR and is it required during self-refresh?

The VREF pin provides the 2.5V reference voltage for SSTL_2 input thresholding on address, command, and control pins. Per the datasheet, VREF must remain stable and powered during self-refresh mode - even though CKE is driven low - because internal input receivers remain active and require valid reference levels to maintain command decode readiness upon exit.

How many auto-refresh commands must be issued to maintain data retention in W9464G6KH-5 TR?

W9464G6KH-5 TR requires 4,096 auto-refresh cycles every 64 ms (tREFI = 64 ms), averaging one refresh every 15.625 µs. The device allows up to eight pending auto-refresh commands, but the absolute interval between any two successive commands must not exceed 8 × tREFI = 512 ms to guarantee data retention across all rows and banks.