Infineon Technologies S27KL0643DPBHB020

Overview

S27KL0643DPBHB020 from Infineon Technologies is a 64Mb self-refresh DRAM (PSRAM) with octal xSPI interface, supporting 1.8 V/3.0 V I/O and core supplies, 200 MHz DDR clock, 400 MBps data throughput, and industrial temperature range (–40°C to +85°C). It serves as high-bandwidth, low-pin-count external memory for microcontrollers and SoCs in embedded graphics, display buffers, and real-time data logging.

For engineers reviewing the S27KL0643DPBHB020 datasheet, S27KL0643DPBHB020 pinout, S27KL0643DPBHB020 application, or S27KL0643DPBHB020 equivalent, this device delivers deterministic latency, configurable burst modes (16–128 bytes), hybrid sleep/deep power down modes, and RWDS-based timing control - critical for resource-constrained MCU-based systems requiring SRAM-like simplicity with DRAM density.

Technical Context

The S27KL0643DPBHB020 implements an xSPI-compliant octal DDR interface with 11–12 signal lines (including optional CK#/RWDS), using LV-CMOS signaling and supporting both single-ended and differential clocking. Its internal refresh controller autonomously manages DRAM array refresh without host intervention, enabling pseudo-static behavior.

It features configurable output drive strength, DCARS-enabled read strobe alignment for timing margin optimization, and supports linear/wrapped/hybrid burst modes across 16-, 32-, 64-, and 128-byte lengths. Memory access uses 16-bit command opcodes followed by optional address and data phases, all synchronized to CK edges in DDR mode.

Key Specifications

Pinout & Package

24-ball FBGA package (5 mm × 5 mm, 0.8 mm pitch) with ball grid arranged in 5×5 array (corner balls omitted). Designed for automated placement and reflow compatibility in high-volume industrial PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S27KS0643DPBHB020, the Infineon part offers identical functionality and supply chain continuity; versus ISSI's parallel SRAM, it reduces signal count by >60%, cuts active power by 40% at 200 MHz, and adds autonomous refresh - making it superior for modern MCU-based edge devices.

Availability

S27KL0643DPBHB020 is available at Aetrix Electronics and suitable for display frame buffers, MCU external code/data memory, and automotive instrument clusters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant variants.

Supply support for S27KL0643DPBHB020 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, sensing, and memory solutions for industrial, automotive, and IoT applications.

The HYPERRAM™ product line targets high-speed, low-pin-count external memory expansion for resource-constrained MCUs and SoCs - bridging the gap between SRAM simplicity and DRAM density.

FAQ

Does S27KL0643DPBHB020 require external refresh management?

No. The device integrates autonomous self-refresh logic that maintains data integrity without host intervention. Refresh occurs transparently during idle cycles or configured partial-array intervals, presenting a pseudo-static interface to the host controller.

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

RWDS functions as a read data strobe during reads - its transitions indicate valid data windows on DQ - and as a write byte mask during writes, allowing selective updating of individual bytes within an 8-bit transfer without additional control signals.

Can S27KL0643DPBHB020 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#) clocking. Differential mode improves noise immunity and timing margin in electrically noisy environments but requires matched trace lengths and proper termination.

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

Hybrid Sleep retains full memory contents and resumes operation in under 100 ns after CS# assertion, while Deep Power Down reduces current to 12 µA but requires ~100 µs initialization before first access. Use Hybrid Sleep for frequent low-latency wake-ups; use Deep Power Down for extended idle periods.