Infineon Technologies S27KL0643DPBHA023

Overview

S27KL0643DPBHA023 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, 400 MBps data throughput, and industrial temperature range (–40°C to +85°C); used as high-bandwidth, low-pin-count external memory for microcontrollers in automotive instrument clusters and ADAS domain controllers.

For engineers reviewing the S27KL0643DPBHA023 datasheet, S27KL0643DPBHA023 pinout, S27KL0643DPBHA023 application, or S27KL0643DPBHA023 equivalent, key selection factors include xSPI octal DDR timing compliance, RWDS strobe behavior during read/write, configurable burst lengths (16–128 bytes), hybrid sleep power mode, and FBGA-24 package compatibility with high-density PCB layouts.

Technical Context

This PSRAM integrates DRAM array refresh control logic that autonomously manages partial/full array refresh without host intervention, enabling static RAM-like interface abstraction. It uses LV-CMOS signaling with optional differential clock (CK/CK#) and bidirectional RWDS for timing-critical DDR data capture.

The xSPI octal interface executes all transactions under chip select (CS#) framing, with 16-bit command fields (dual 8-bit opcodes sent on both CK edges), linear or wrapped burst addressing, and DCARS-enabled center-aligned read strobe for improved setup/hold margin at 200 MHz.

Key Specifications

Pinout & Package

Package: 24-ball FBGA, 5 mm × 5 mm, 0.8 mm pitch, RoHS-compliant, bottom-side thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S27KS0643DPBHA020, this part offers identical functionality and qualification; versus IS66WV1288GL-100BLLI, it trades pin count and simplicity for 4× bandwidth, autonomous refresh, and 90% lower active power at equivalent throughput.

Availability

S27KL0643DPBHA023 is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS domain controllers, and industrial HMI panels requiring stable component supply with AEC-Q100 Grade 3 qualification and long-term lifecycle support.

Supply support for S27KL0643DPBHA023 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 infrastructure.

S27KL0643DPBHA023 belongs to the HYPERRAM™ product line, designed specifically to replace parallel SRAM and low-density DDR in resource-constrained embedded systems needing high bandwidth with minimal pin count and zero refresh overhead.

FAQ

Does S27KL0643DPBHA023 require external refresh commands from the host processor?

No. The device contains integrated self-refresh logic that autonomously executes partial or full array refresh cycles during idle periods. Host software does not issue refresh commands; the xSPI interface presents a static RAM abstraction. Refresh timing is fully managed internally, including during Hybrid Sleep mode.

What is the function of the RWDS pin during write transactions?

During write operations, RWDS serves as a write data mask: each rising edge samples one byte of DQ[7:0] for latching into the memory array. This eliminates the need for separate write-enable signals and allows precise per-byte masking without additional control lines.

Can S27KL0643DPBHA023 operate with only single-ended clock (CK), or is differential clock (CK/CK#) mandatory?

Single-ended CK operation is fully supported and default; CK# is optional. The device detects presence of CK# via internal biasing and auto-configures for differential mode only when CK# is externally driven. No configuration register change is needed - mode selection is hardware-determined.

Is DCARS (DDR Center-Aligned Read Strobe) enabled by default, and how is it configured?

DCARS is disabled by default. It is activated by setting bit 4 (DCARS_EN) in Configuration Register 1 (CR1), accessible via READ/WRITE ANY REGISTER xSPI commands. Once enabled, RWDS output shifts by 90° relative to CK for all subsequent read transactions until disabled or reset.