Infineon Technologies S27KL0642DPBHI020

Overview

S27KL0642DPBHI020 from Infineon Technologies is a 64Mb self-refresh DRAM (PSRAM) with HYPERBUS™ interface, operating at 1.8 V or 3.0 V VCC/VCCQ, supporting DDR transfers up to 200 MHz clock rate and 400 MBps throughput. It features bidirectional RWDS strobe, configurable burst lengths (16–128 bytes), partial/full array refresh, and 24-ball FBGA package for industrial (-40°C to +85°C) applications including automotive infotainment display buffers.

For engineers reviewing the S27KL0642DPBHI020 datasheet, S27KL0642DPBHI020 pinout, S27KL0642DPBHI020 application, or S27KL0642DPBHI020 equivalent, this page delivers verified technical context, real-world timing behavior of RWDS in read/write cycles, burst configuration register mapping, DCARS phase-shifted strobe operation, and validated alternatives for HYPERRAM™-based memory expansion in MCU-hosted embedded systems.

Technical Context

The device implements a HYPERBUS™ DDR interface with 8-bit DQ bus and bidirectional RWDS used as both read data strobe and write mask-its edge alignment relative to CK determines data capture timing. Internal refresh logic operates autonomously during idle intervals, eliminating host-managed refresh but requiring transaction length limits to guarantee refresh window availability.

It supports linear and wrapped burst modes (16/32/64/128-byte), hybrid burst (wrapped + linear), and optional DDR center-aligned read strobe (DCARS) that shifts RWDS phase by one-half clock cycle to center transitions within the read data eye-critical for signal integrity at 200 MHz.

Key Specifications

Pinout & Package

Package: 24-ball FBGA (5 mm × 5 mm, 0.8 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PSRAM-based memory expansion applications.

Compared with S27KL0642DPBHI020, the Cypress variant offers identical functionality under a legacy name, while the ISSI SRAM trades bandwidth scalability and power efficiency for interface simplicity-making it suitable only where HYPERBUS™ infrastructure is unavailable.

Availability

S27KL0642DPBHI020 is available at Aetrix Electronics and suitable for automotive cluster displays, industrial HMIs, edge AI inference accelerators, and medical imaging preview systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for S27KL0642DPBHI020 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, automotive ICs, and memory solutions, with global R&D and manufacturing facilities.

This device belongs to the HYPERRAM™ product line, designed specifically to replace parallel NOR/NAND and SRAM in bandwidth-constrained embedded systems using low-pin-count, high-speed DDR interfaces.

FAQ

What is the function of the RWDS signal in read versus write operations?

RWDS serves dual roles: during reads, it is driven by the device as an output to indicate data validity and align with the first data byte; during writes, it is driven by the host as an input to mask individual bytes on the DQ bus. Its bidirectional nature eliminates need for separate read strobe and write mask lines, reducing pin count while maintaining timing precision.

Does S27KL0642DPBHI020 require external refresh circuitry?

No. The device integrates autonomous self-refresh logic that executes periodic row refreshes during CS# inactive periods. Host software does not manage refresh cycles, making it appear as static RAM to the system-though burst length must be limited to ensure sufficient idle time for internal refresh completion.

How does DCARS improve signal integrity at 200 MHz?

DCARS shifts the RWDS output phase by one-half clock cycle relative to CK, moving its transition edge from the data bit boundary into the center of the data eye. This increases setup/hold margin for high-speed read capture, especially critical on long or lossy PCB traces where jitter and skew degrade timing margins at maximum clock rate.

Can S27KL0642DPBHI020 operate with only single-ended clock (CK) instead of differential (CK/CK#)?

Yes. The device supports both configurations: single-ended CK uses 11-signal HYPERBUS™ mode (CS#, CK, RWDS, DQ[7:0], RESET#); differential CK/CK# uses 12-signal mode and improves noise immunity. Configuration is fixed at power-up based on CK# pin voltage level-no runtime switching.