Infineon Technologies S27KS0643GABHB020

Overview

S27KS0643GABHB020 from Infineon is a 64Mb self-refresh DRAM (PSRAM) with octal xSPI interface, supporting 1.8 V/3.0 V I/O, 200 MHz DDR clock, and 400 MBps data throughput. It delivers linear/wrapped burst lengths (16–128 bytes), configurable drive strength, and operates across industrial temperature range (−40°C to +85°C) in 24-ball FBGA package. Used as high-bandwidth external memory for microcontrollers in embedded vision and real-time HMI systems.

For engineers reviewing the S27KS0643GABHB020 datasheet, S27KS0643GABHB020 pinout, S27KS0643GABHB020 application, or S27KS0643GABHB020 equivalent, key selection criteria include xSPI octal timing compliance, RWDS strobe behavior during read/write, partial array refresh support, and DCARS phase-shifted read strobe capability for timing margin optimization.

Technical Context

This PSRAM integrates DRAM array with on-die refresh controller and xSPI protocol engine, eliminating host-managed refresh. Its DDR octal interface uses CK (single-ended or differential) and RWDS as bidirectional strobe-output during reads (data valid indicator), input during writes (mask signal), and offset by phase-shifted clock in DCARS mode to center transitions within the read data eye.

The device supports hybrid sleep and deep power down modes, with standby current as low as 330 µA at 2.0 V/105°C. Memory access requires command-driven transactions (16-bit opcode), with latency insertion signaled via RWDS at transaction start when internal refresh is pending-enabling deterministic timing without host intervention.

Key Specifications

Pinout & Package

Package: 24-ball FBGA, 5 mm × 5 mm, 0.8 mm pitch, RoHS-compliant, industrial temperature grade (−40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with S27KS0643GABHB020, the Cypress variant offers zero migration risk, while the ISSI SRAM trades pin count and power efficiency for absolute timing determinism-making it suitable only where xSPI infrastructure is unavailable.

Availability

S27KS0643GABHB020 is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMI panels, edge AI vision modules, and medical patient monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for S27KS0643GABHB020 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, sensor, and memory solutions for automotive, industrial, and IoT markets.

The HYPERRAM™ product line delivers high-density, low-pin-count PSRAM optimized for MCU-based systems needing DRAM-like capacity without complex controller logic or high power consumption.

FAQ

What is the purpose of the RWDS signal in S27KS0643GABHB020?

RWDS serves three distinct roles: (1) as an output indicating refresh latency at transaction start, (2) as a read data strobe synchronized to CK edges during reads, and (3) as a write data mask input during writes. In DCARS mode, its phase is shifted to center transitions within the read data eye, improving timing margin at 200 MHz DDR operation.

Does S27KS0643GABHB020 require external refresh commands from the host MCU?

No. The device contains integrated self-refresh logic that autonomously manages DRAM array refresh during idle cycles. Host only issues standard xSPI commands (READ/WRITE/RESET); refresh timing and scheduling are fully internal and transparent to the host interface.

How does the DCARS feature improve system reliability?

DCARS offsets the RWDS signal by a phase-shifted clock, moving its transition edge from the data bit boundary into the center of the read data eye. This increases setup and hold time margins by up to 150 ps at 200 MHz, reducing bit errors in electrically noisy environments like automotive or industrial settings.

Can S27KS0643GABHB020 operate with both 1.8 V and 3.0 V I/O supplies simultaneously?

No. VCC and VCCQ are internally tied; the device is manufactured in separate voltage-grade variants. S27KS0643GABHB020 is specified for 1.8 V nominal operation (VCC/VCCQ = 1.7–1.95 V). A 3.0 V variant exists under different part number (e.g., S27KS0643GABHB030) with distinct electrical characteristics.