Winbond Electronics Corporation W9464G6KH-5I TR

Overview

W9464G6KH-5I TR from Winbond Electronics 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 industrial temperature range (–40°C to +85°C); used as main memory in embedded controllers, network interface cards, and legacy industrial PCs requiring DDR400/CL3 compliance.

For engineers reviewing the W9464G6KH-5I TR datasheet, W9464G6KH-5I TR pinout, W9464G6KH-5I TR application, or W9464G6KH-5I TR equivalent, key selection criteria include TSOP-II 66-pin package compatibility, SSTL_2 interface voltage levels, DLL-enabled timing control, and verified self-refresh current ≤2 mA at full temperature range.

Technical Context

This DDR SDRAM implements double-data-rate architecture synchronized to both edges of DQS, with differential CLK/CLK inputs referenced at crossing point. It supports programmable burst lengths (2/4/8), interleave or sequential addressing modes, and write latency = 1.

Internal DLL enables precise data-eye alignment: DQS is edge-aligned with read data and center-aligned with write data. Mode and Extended Mode Registers configure CAS latency, burst length, DLL enable/disable, and output driver type - all required during power-up initialization before first valid command.

Key Specifications

Pinout & Package

W9464G6KH-5I TR uses a 66-pin TSOP-II package with dedicated VDD/VDDQ power domains, separated VSS/VSSQ grounds, and dual DQS/DM pairs for upper and lower byte lanes. Pin functions are validated per Winbond datasheet Rev. A02 (Nov. 2014).

Key Features

Applications

Equivalent & Alternatives

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

Compared with W9464G6KH-5I TR, MT46V64M16P-5B:J offers higher frequency headroom but lacks industrial temperature validation, while IS42S16600F-5BL provides identical thermal specs and pinout but mandates vendor-specific initialization - making W9464G6KH-5I TR optimal for drop-in replacement in existing Winbond-qualified platforms.

Availability

W9464G6KH-5I TR is available at Aetrix Electronics and suitable for industrial PLCs, legacy embedded PCs, and network interface cards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W9464G6KH-5I 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 manufacturer specializing in specialty memory solutions including NOR/NAND Flash, SRAM, and DRAM products for industrial and embedded markets.

The W9464G6KH series belongs to Winbond's legacy DDR SDRAM product line, designed specifically for cost-sensitive, thermally demanding applications where DDR400 bandwidth and industrial-grade reliability are essential.

FAQ

What is the maximum operating frequency supported by W9464G6KH-5I TR?

W9464G6KH-5I TR supports a maximum clock frequency of 200 MHz, corresponding to DDR400 data rate (400 MT/s). This is confirmed by tCK minimum values of 5 ns (CL=3), 6 ns (CL=2.5), and 7.5 ns (CL=2) in the datasheet. The -5I suffix denotes industrial-grade qualification across –40°C to +85°C at this speed.

Does W9464G6KH-5I TR require an external VREF supply?

Yes, W9464G6KH-5I TR requires an externally supplied VREF voltage of 1.25V ±1% applied to pin 49. This reference sets the switching threshold for all SSTL_2 address and control inputs (CS, RAS, CAS, WE, A0–A11, BA0, BA1, CKE, CLK), and must remain stable during self-refresh mode.

How many banks does W9464G6KH-5I TR contain, and how are they accessed?

W9464G6KH-5I TR contains four independent memory banks, selected using BA0 and BA1 inputs. Each bank operates autonomously: one bank can be active (row open) while others are precharged, enabling bank interleaving to hide tRCD and tRP delays during sequential accesses.

What is the purpose of the LDQS and UDQS pins on W9464G6KH-5I TR?

LDQS and UDQS are bidirectional data strobes for the lower (DQ0–DQ7) and upper (DQ8–DQ15) byte lanes respectively. During reads, they output edge-aligned with data; during writes, they input center-aligned with data. This dual-strobe architecture enables precise per-byte timing control and supports write masking via LDM/UDM.

Can W9464G6KH-5I TR operate without DLL calibration?

No - DLL calibration is mandatory for functional operation. The Extended Mode Register Set (EMRS) command must enable the DLL, followed by Mode Register Set (MRS) with DLL reset (A8 = high), then ≥200 clock cycles for lock before issuing any read/write command. Skipping this sequence results in undefined DQS/data alignment and read failures.