Infineon Technologies S29AS008J70BFI040

Overview

S29AS008J70BFI040 from Infineon Technologies (formerly Cypress) is an 8 Mbit, 1.8 V-only boot sector Flash memory organized as 1M × 8-bit or 512K × 16-bit, featuring top/bottom boot architecture, 70 ns access time, and industrial temperature range (−40°C to +85°C). It supports in-system programming/erasure with single 1.8 V supply, includes Secured Silicon Sector with 256-byte factory-programmable serial ID, and is used in embedded boot code storage for microcontrollers and FPGA configuration.

For engineers reviewing the S29AS008J70BFI040 datasheet, S29AS008J70BFI040 pinout, S29AS008J70BFI040 application, or S29AS008J70BFI040 equivalent, key selection criteria include boot sector protection granularity, CFI compliance for host auto-configuration, erase suspend capability for real-time firmware updates, and 1.8 V-only operation for low-power portable systems.

Technical Context

This device implements a command-register–driven state machine for Embedded Erase and Embedded Program algorithms, automatically timing Fowler-Nordheim tunneling erase pulses and hot-electron injection programming. It uses separate CE#, OE#, and WE# controls to eliminate bus contention and supports both byte (x8) and word (x16) data bus configurations via BYTE# pin.

Hardware protection includes a low-VCC detector inhibiting writes during power transitions, RY/BY# pin for cycle completion signaling, and WP# input enabling hardware lock of two outermost boot sectors independent of software sector group protection. Erase Suspend/Erase Resume allows background read/program operations on non-erasing sectors.

Key Specifications

Pinout & Package

Package: 48-ball FBGA (VBK048, 8.15 mm × 6.15 mm, 0.8 mm pitch) - optimized for high-density PCB layouts and thermal performance in compact embedded modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boot sector Flash memory applications.

Compared with S29AS008J70BFI040, the S29GL032N90TFI010 offers greater density but sacrifices 1.8 V compatibility and boot-sector flexibility, while the MX29LV008CTTI-70G omits critical security and configurability features required for modern embedded certification.

Availability

S29AS008J70BFI040 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive body control module boot memory, and FPGA configuration storage requiring stable component supply, long-term lifecycle support, and guaranteed 1.8 V operation.

Supply support for S29AS008J70BFI040 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, sensor, and memory solutions for automotive, industrial, and IoT applications.

The S29AS008J belongs to Infineon's legacy Cypress Flash memory portfolio, designed specifically for reliable, low-voltage boot code storage in resource-constrained embedded systems requiring security, endurance, and JEDEC interoperability.

FAQ

Does S29AS008J70BFI040 support both x8 and x16 data bus widths?

Yes. The device operates in byte mode (x8, DQ7–DQ0 active) or word mode (x16, DQ15–DQ0 active) selected by the BYTE# pin. In byte mode, DQ15 functions as A-1 (address LSB), enabling full 1M-byte addressing. This dual-bus capability simplifies migration between 8-bit and 16-bit microcontroller platforms without redesigning the memory interface.

How is the Secured Silicon Sector programmed and locked?

The 256-byte Secured Silicon Sector is programmed using the Enter Secured Silicon Sector command sequence followed by standard program commands. Locking is performed via the Sector Protect command; once locked, the sector becomes permanently read-only unless unlocked via factory-level procedures. It ships unprogrammed and unlocked, allowing customer-specific serialization during final test or system assembly.

What is the function of the RY/BY# pin during erase and program operations?

RY/BY# is an open-drain output that goes low during active program or erase cycles and returns high when the operation completes. It provides hardware-level status feedback independent of polling DQ7 or DQ6, enabling interrupt-driven firmware handling and eliminating CPU polling overhead in real-time systems.

Can S29AS008J70BFI040 be used in place of older S29AL008J devices?

Yes, with qualification. Both share identical pinout, command set, and boot sector architecture, but S29AS008J uses 110 nm process technology versus 130 nm in S29AL008J, resulting in lower power consumption (8 µA standby vs 12 µA) and improved erase uniformity. System-level validation is recommended due to minor AC timing differences in high-speed interfaces.