Infineon Technologies S27KL0643GABHI020

Overview

S27KL0643GABHI020 from Infineon is a 64Mb self-refresh DRAM (PSRAM) with octal xSPI interface, operating at 1.8 V or 3.0 V, supporting DDR transfers up to 200 MHz and delivering up to 400 MBps throughput. It integrates on-die refresh control, uses 24-ball FBGA (5 × 5 mm), and targets high-bandwidth, low-pin-count memory expansion in microcontroller-based systems requiring seamless SRAM-like access to DRAM density.

For engineers reviewing the S27KL0643GABHI020 datasheet, S27KL0643GABHI020 pinout, S27KL0643GABHI020 application, or S27KL0643GABHI020 equivalent, key selection criteria include xSPI octal timing compliance, RWDS strobe behavior, configurable burst lengths (16–128 bytes), hybrid sleep/deep power-down modes, and AEC-Q100 Grade 2 qualification for automotive embedded use.

Technical Context

This PSRAM implements a DDR xSPI interface with 11–12 signal pins (including optional CK#/RWDS/DCARS), using LV-CMOS I/Os and supporting both single-ended and differential clocking. Its internal logic manages autonomous partial/full array refresh without host intervention, while enforcing transaction-length limits to accommodate refresh latency windows.

The device supports linear and wrapped burst modes (8–64 clocks), configurable drive strength, and dual VCC/VCCQ supply domains - enabling interoperability across 1.8 V and 3.0 V host systems. DCARS functionality provides phase-shifted RWDS alignment to maximize read data eye margin 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 applications.

Compared with S27KL0643GABHI020, the Cypress variant offers identical performance and qualification but differs in branding and documentation lineage, while the ISSI SRAM demands significantly more board space and power, lacks integrated refresh, and cannot scale to equivalent bandwidth without bus widening.

Availability

S27KL0643GABHI020 is available at Aetrix Electronics and suitable for automotive infotainment, industrial HMI, and edge AI sensor fusion applications requiring stable component supply, AEC-Q100 compliance, and high-speed serial memory expansion.

Supply support for S27KL0643GABHI020 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.

S27KL0643GABHI020 belongs to the HYPERRAM™ product line, designed specifically to replace parallel SRAM and low-density SDRAM in bandwidth-constrained, pin-limited embedded systems while maintaining ease of integration and low system-level power.

FAQ

Does S27KL0643GABHI020 require external refresh circuitry?

No. It contains fully autonomous self-refresh logic that manages DRAM array refresh without host intervention. The host accesses it as if it were static RAM - no refresh commands, timers, or scheduling are needed. Refresh occurs transparently during idle periods or within configurable latency windows at transaction start.

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

In read operations, RWDS is an output that toggles to indicate valid data timing - its edge aligns with data centering, especially when DCARS is enabled. In write operations, RWDS becomes an input used as a per-byte write mask, allowing selective updating of DQ[7:0] lanes without full-bus writes.

Can S27KL0643GABHI020 operate with only single-ended clock (CK), or is differential (CK/CK#) mandatory?

Single-ended CK operation is fully supported and default; CK# is optional. The device automatically detects clock configuration during power-up initialization. Differential mode improves noise immunity in electrically noisy environments but requires matched trace routing and adds one PCB net.

How does Hybrid Sleep mode differ from Deep Power Down in terms of wake latency and power consumption?

Hybrid Sleep draws ~330 µA at 105 °C and resumes operation in ≤500 ns, preserving memory contents and register state. Deep Power Down consumes only 12 µA but requires ≥100 µs wake time and full reinitialization - including register reload and internal calibration - making it suitable only for extended idle periods.