Infineon Technologies S27KS0642GABHM023

Overview

S27KS0642GABHM023 from Infineon is a 64-Mbit Automotive Grade 1 HyperRAM self-refresh DRAM with HyperBus interface, operating at 1.8 V or 3.0 V, supporting up to 200 MHz DDR clock rate and delivering 400 MBps throughput. It integrates on-die refresh control, presents as pseudo-static RAM to host controllers, and features bidirectional RWDS for latency indication, read strobe, and write masking - deployed in automotive ADAS display buffers and infotainment memory expansion.

For engineers reviewing the S27KS0642GABHM023 datasheet, S27KS0642GABHM023 pinout, S27KS0642GABHM023 application, or S27KS0642GABHM023 equivalent, key selection criteria include HyperBus timing compliance (tACC ≤ 35 ns), AEC-Q100 Grade 1 temperature range (–40 °C to +125 °C), configurable burst lengths (16–128 bytes), DCARS support, and FBGA-24 package compatibility with 5 mm × 5 mm footprint.

Technical Context

The S27KS0642GABHM023 implements a DDR HyperBus interface with 8-bit DQ bus, single-ended or optional differential CK/CK#, and bidirectional RWDS used for initial latency signaling, source-synchronous read strobe, and byte-level write masking. Its internal logic manages partial or full array refresh autonomously without host intervention.

It supports linear and wrapped burst modes (16/32/64/128-byte), hybrid burst (wrapped + linear), configurable output drive strength, and four power modes: Interface Standby, Active Clock Stop, Hybrid Sleep, and Deep Power Down - enabling dynamic power scaling in automotive real-time systems.

Key Specifications

Pinout & Package

Package: 24-ball FBGA, 5 mm × 5 mm, 0.8 mm ball pitch, RoHS-compliant, moisture sensitivity level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with S27KS0642GABHM013, the S27KS0642GABHM023 adds AEC-Q100 Grade 1 qualification and automotive-grade screening; versus IS66WV12816EBLL-15BLI, it reduces signal count by >60%, eliminates refresh overhead, and doubles bandwidth - making it optimal for new automotive SoC designs with HyperBus support.

Availability

S27KS0642GABHM023 is available at Aetrix Electronics and suitable for ADAS display buffers, infotainment UI framestores, and instrument cluster memory expansion requiring stable component supply across automotive production lifecycles.

Supply support for S27KS0642GABHM023 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.

This part belongs to the HyperRAM product line - designed specifically to bridge the cost-performance gap between SRAM and DRAM in automotive and industrial embedded systems requiring high bandwidth, low pin count, and autonomous refresh.

FAQ

Does S27KS0642GABHM023 require external refresh circuitry?

No. The device contains integrated self-refresh logic that autonomously manages DRAM array refresh during idle periods or Hybrid Sleep mode. Host processors interact with it as a pseudo-static RAM - no refresh commands, timers, or scheduling are needed. Refresh occurs transparently and does not interrupt active transactions, though burst length must be limited per datasheet guidelines to ensure sufficient idle time.

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

During write transactions, RWDS acts as a byte-level write mask: when RWDS is HIGH, the corresponding DQ[7:0] byte is masked and not written to memory; when LOW, the byte is valid and stored. This enables unaligned writes and merging of partial-word updates within a single burst - critical for efficient firmware patching or configuration table updates without read-modify-write cycles.

Can S27KS0642GABHM023 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. Differential mode must be enabled via configuration register and improves timing margin in noisy automotive environments. Single-ended operation is fully functional and commonly used in space-constrained layouts where routing a matched CK/CK# pair is impractical.

Is DCARS functionality enabled by default, and how is it configured?

DCARS is disabled by default. It is activated by setting bit 4 (DCARS_EN) in the Device Configuration Register (DCR), accessible via HyperBus register write. Once enabled, RWDS transitions are phase-shifted relative to CK to center the strobe edge in the read data eye - improving setup/hold margins at 200 MHz, especially with longer trace lengths or marginal signal integrity.