Infineon Technologies S27KL0643DPBHA020

Overview

S27KL0643DPBHA020 from Infineon is a 64Mb self-refresh DRAM (PSRAM) with octal xSPI interface, 1.8 V/3.0 V dual-supply support, 200 MHz DDR clock, 400 MBps data throughput, and 24-ball FBGA package. It serves as high-bandwidth, low-pin-count external memory for microcontrollers and SoCs in embedded vision, industrial HMI, and automotive infotainment systems where SRAM density is insufficient and DRAM complexity must be avoided.

For engineers reviewing the S27KL0643DPBHA020 datasheet, S27KL0643DPBHA020 pinout, S27KL0643DPBHA020 application, or S27KL0643DPBHA020 equivalent, this device delivers configurable burst lengths (16–128 bytes), hybrid sleep/deep power-down modes, DCARS-enabled read strobe alignment, partial array refresh, and AEC-Q100 Grade 2 qualification - all critical for real-time memory interfacing in resource-constrained designs.

Technical Context

The S27KL0643DPBHA020 implements an octal xSPI interface with DDR signaling on DQ[7:0], using CK/CK# differential clock option and RWDS bidirectional strobe for timing control. Its internal logic manages autonomous self-refresh without host intervention, while requiring host-enforced transaction length limits to accommodate internal refresh cycles.

It supports linear and wrapped burst modes (8–64 clocks), configurable output drive strength, and register-accessible control of power modes (hybrid sleep, deep power down), voltage thresholds, and DCARS phase offset - enabling precise timing margin optimization in high-speed PCB layouts.

Key Specifications

Pinout & Package

24-ball FBGA (5 mm × 5 mm, 0.8 mm pitch) with ball map optimized for signal integrity: CS# and RESET# placed adjacent to power balls for noise immunity; CK/CK# differential pair routed on opposite edges; RWDS centered between DQ[7:0] for balanced strobe skew.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S27KS0643DPBHA020, the Infineon part offers identical performance but clearer long-term supply chain visibility; versus ISSI's LPDDR2 PSRAM, it delivers 4× higher bandwidth, 50% lower active current, and true xSPI plug-and-play integration - critical for fast time-to-market in automotive and industrial designs.

Availability

S27KL0643DPBHA020 is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMIs, edge AI vision preprocessing, and smart home gateway memory expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for S27KL0643DPBHA020 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.

The HYPERRAM™ product line targets high-speed, low-pin-count external memory for MCUs and SoCs where traditional SRAM is too costly and SDRAM too complex - delivering PSRAM simplicity with DRAM density and xSPI ease-of-use.

FAQ

Does S27KL0643DPBHA020 require external refresh circuitry?

No. The device integrates autonomous self-refresh logic that executes internal DRAM refresh cycles without host intervention. The host only needs to observe maximum burst length limits (e.g., ≤128 bytes) to ensure sufficient idle time for refresh. This makes it functionally equivalent to SRAM in software abstraction, eliminating refresh-related firmware complexity.

What is the purpose of the RWDS signal and how does DCARS improve timing?

RWDS serves as a bidirectional strobe: output during reads to indicate data validity, input during writes as byte mask. DCARS shifts RWDS phase by one CK edge specifically during reads, moving its transition edge into the center of the DQ data eye. This compensates for PCB trace skew and setup/hold uncertainty, enabling reliable 200 MHz DDR operation without custom layout tuning.

Can S27KL0643DPBHA020 operate with only single-ended clock (CK), or is CK# mandatory?

CK# is optional. The device supports both single-ended (CK only) and differential (CK/CK#) clock modes. When using single-ended mode, CK# must be tied to VSS or VCC per datasheet guidance. Differential mode is recommended for >166 MHz operation to suppress common-mode noise and improve jitter tolerance - essential for robust 200 MHz timing margins.

How does Hybrid Sleep mode differ from Deep Power Down in terms of retention and wake-up latency?

In Hybrid Sleep, memory contents are retained and wake-up latency is <1 µs (no initialization required); current draw is 330 µA at 2.0 V. In Deep Power Down, contents are lost and wake-up requires full power-up initialization (~100 µs), but current drops to 12 µA. Use Hybrid Sleep for frequent low-latency wake events; use Deep Power Down only for extended idle periods where content loss is acceptable.