Infineon Technologies S27KL0643GABHB020

Overview

S27KL0643GABHB020 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 integrates on-die refresh control, uses 24-ball FBGA (5×5 mm), and operates across industrial (-40°C to +85°C) and automotive AEC-Q100 Grade 2 (-40°C to +105°C) temperature ranges.

For engineers reviewing the S27KL0643GABHB020 datasheet, S27KL0643GABHB020 pinout, S27KL0643GABHB020 application, or S27KL0643GABHB020 equivalent, key selection criteria include xSPI octal DDR timing compliance, RWDS strobe behavior, configurable burst lengths (16–128 bytes), hybrid sleep/deep power-down current specs (12 µA @ 1.8 V), and DCARS phase-shifted read strobe support.

Technical Context

This PSRAM implements a self-refresh DRAM core with integrated logic that autonomously schedules array refresh during idle cycles - eliminating host refresh management. Its xSPI octal interface uses 12 signals (including optional CK#/RWDS) and transfers two 8-bit words per CK edge in DDR mode.

The device supports linear and wrapped burst modes (8–64 clocks), configurable output drive strength, and dual VCC/VCCQ supply domains. RWDS serves as bidirectional strobe: output for read latency indication and write mask input, with optional DDR center-aligned read strobe (DCARS) enabling precise data capture within the read eye.

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 S27KL0643GABHB020, the Cypress variant offers identical performance and drop-in compatibility, while the ISSI SRAM trades pin count and power efficiency for simpler timing - making it viable only where xSPI infrastructure is unavailable.

Availability

S27KL0643GABHB020 is available at Aetrix Electronics and suitable for automotive ADAS displays, industrial HMIs, and edge AI accelerators requiring stable component supply, AEC-Q100 qualification, and high-bandwidth, low-pin-count memory expansion.

Supply support for S27KL0643GABHB020 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.

S27KL0643GABHB020 belongs to the HYPERRAM™ family - designed specifically to replace parallel SRAM and LPDDR in bandwidth-constrained, pin-limited embedded systems while delivering DRAM density and SRAM-like ease of use.

FAQ

Does S27KL0643GABHB020 require external refresh commands from the host processor?

No. The device contains an integrated self-refresh controller that autonomously manages DRAM array refresh during idle cycles. Host systems interact with it as a pseudo-static RAM - no refresh commands, timers, or scheduling logic are needed in firmware or hardware.

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

During write operations, RWDS functions as an input serving as byte-level write mask: each bit corresponds to one DQ byte lane, allowing selective updating of individual bytes within an 8-byte word without read-modify-write overhead.

Can S27KL0643GABHB020 operate with only single-ended clock (CK), or is differential clock (CK#) mandatory?

Single-ended clock (CK only) is fully supported and default configuration. CK# is optional and used only when differential signaling is implemented for improved noise immunity and timing margin - no hardware or firmware change is needed to disable CK#.

How does the DCARS feature improve timing margin in high-speed read operations?

DCARS generates a phase-shifted version of CK to drive RWDS during reads, positioning the RWDS edge near the center of the DQ data eye. This increases effective setup and hold time at 200 MHz DDR, especially on boards with trace-length mismatches or signal degradation.