Infineon Technologies S70KL1281DABHI020

Overview

S70KL1281DABHI020 from Infineon Technologies (formerly Cypress) is a 128 Mb (16 MB) HyperRAM™ self-refresh DRAM with integrated refresh logic, operating as pseudo-static RAM (PSRAM) for seamless integration into memory-constrained embedded systems. It features an 8-bit DDR HyperBus interface, supports 1.8 V I/O with differential clock (CK/CK#), delivers up to 333 MBps throughput at 166 MHz, and uses a 24-ball FBGA package (5 mm × 5 mm). It is deployed in automotive instrument clusters requiring low-latency, high-bandwidth external memory with minimal pin count.

For engineers reviewing the S70KL1281DABHI020 datasheet, S70KL1281DABHI020 pinout, S70KL1281DABHI020 application, or S70KL1281DABHI020 equivalent, key selection criteria include DDR timing compliance, RWDS-based read/write strobe alignment, DCARS phase-shifted data capture, deep power-down current (20 µA at 1.8 V), and HyperBus command/address protocol compatibility with MCU HyperBus controllers such as those in Infineon's AURIX™ TC3xx series.

Technical Context

This device implements a dual-die stack of two 64 Mb HyperRAM dies in a single package, sharing common control and data signals while maintaining independent internal refresh management. Its HyperBus interface uses center-aligned command/address transfers and edge-aligned read data strobes via RWDS, with configurable initial latency (1× or 2×) signaled dynamically during CA phase.

The DDR architecture enables two 8-bit data transfers per clock cycle on DQ[7:0], supporting linear or wrapped burst lengths (16–128 bytes), selectable per transaction. RWDS serves three distinct roles: latency indicator during CA phase, source-synchronous read strobe during reads, and write mask during writes - all synchronized to a phase-shifted clock derived from CK for optimal data eye positioning.

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/HyperBus memory applications.

Compared with S70KL1281DABHI020, the S70KL1281DABHI023 trades automotive qualification for cost reduction in non-automotive settings, while the S27KL0641DABHI020 offers half the density and lower speed at 3.0 V - making it viable only where thermal margin and bandwidth headroom are relaxed.

Availability

S70KL1281DABHI020 is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMI displays, and ADAS camera preprocessing modules requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.

Supply support for S70KL1281DABHI020 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 global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive microcontrollers, and memory solutions with strong focus on safety-critical and high-reliability applications.

This part belongs to Infineon's HyperRAM™ product line, designed specifically to replace parallel SRAM and low-density SDRAM in resource-constrained embedded systems where pin count, power, and software simplicity are prioritized over raw density scalability.

FAQ

Is S70KL1281DABHI020 pin-compatible with S27KL0641DABHI020?

Yes - both devices use identical 24-ball FBGA packages with matching pinout, voltage assignments, and HyperBus interface signaling. The S70KL1281DABHI020 is a direct capacity upgrade; no PCB redesign is needed when migrating from 64 Mb to 128 Mb, provided the host controller supports the larger address space and extended burst timing.

Does this device require external refresh circuitry or software management?

No - the S70KL1281DABHI020 integrates autonomous self-refresh logic that executes internal row refresh cycles without host intervention. The HyperBus interface abstracts DRAM complexity entirely, presenting the device as a synchronous PSRAM with deterministic access timing and no refresh-related latency penalties during active transactions.

What is the significance of RWDS being bidirectional and its role in DCARS timing?

RWDS transitions from output (indicating initial latency during CA phase) to input (write mask) or output (read strobe) depending on transaction phase. In DCARS mode, RWDS is phase-shifted relative to CK to center its edge within the read data eye - this relaxes timing closure requirements by up to 150 ps compared to conventional source-synchronous DDR schemes, easing layout in high-speed automotive PCBs.

Can this part operate with a single 1.8 V supply, or are separate VCC and VCCQ rails mandatory?

Separate VCC (core) and VCCQ (I/O) supplies are mandatory per datasheet specifications. Both must be supplied at 1.8 V nominal for this variant ('D' suffix). Using a single rail violates absolute maximum ratings and risks data corruption due to I/O buffer undervoltage or core logic instability - dual-rail decoupling with dedicated 100 nF ceramic capacitors per supply is required.