STMicroelectronics M29W128FT70N6E

Overview

M29W128FT70N6E from STMicroelectronics is a 128-Mbit (16Mb × 8 or 8Mb × 16) parallel NOR Flash memory with single 2.7–3.6V supply operation, 70 ns access time, and uniform 64KB block architecture. It integrates an on-chip Program/Erase Controller, supports JEDEC-standard command set, and includes a dedicated 256-byte Extended Block for irreversible security data storage.

For engineers reviewing the M29W128FT70N6E datasheet, M29W128FT70N6E pinout, M29W128FT70N6E application, or M29W128FT70N6E equivalent, key selection criteria include block erase timing (800 ms typical), hardware write protection via VPP/WP and RP pins, asynchronous random/page read capability, and compatibility with microprocessor bus interfaces requiring no external logic.

Technical Context

The device implements a command-based interface where Program and Erase operations are initiated via specific address/data sequences written to the Command Interface. Its internal state machine handles voltage sequencing, timing control, and status reporting through the RB (Ready/Busy) pin.

Hardware protection operates at two levels: VPP/WP pin locks the top block (M29W128FH) or bottom block (M29W128FL), while RP pin enables temporary unprotection of blocks secured by High Voltage Block Protection. The Extended Block supports dedicated CFI-accessible security storage with irreversible lock.

Key Specifications

Pinout & Package

Package: TSOP-56 (Thin Small Outline Package, 56-pin, 14 mm × 20 mm, 0.5 mm pitch).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar parallel NOR Flash memory applications.

Compared with S29GL128P11TFI010 and MX29LV128DTTC-90G, M29W128FT70N6E uniquely delivers 70 ns speed, RP-enabled temporary unprotection, and irreversible Extended Block security - making it optimal for safety-critical embedded systems requiring deterministic timing and hardened firmware integrity.

Availability

M29W128FT70N6E is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code, and automotive infotainment head unit applications requiring stable component supply and long-term lifecycle support.

Supply support for M29W128FT70N6E 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

M29W128FT70N6E belongs to ST's parallel NOR Flash memory product line, engineered for reliable code execution and firmware storage in resource-constrained embedded systems requiring deterministic timing and hardware-level security features.

FAQ

What is the function of the RP_N pin on M29W128FT70N6E?

The RP_N (Reset/Temporary Unprotect) pin is an active-low input that, when asserted, temporarily disables High Voltage Block Protection on previously locked blocks. This allows safe field firmware updates without permanently removing hardware protection. It does not affect VPP/WP-locked blocks and requires no external voltage - operation is purely logic-level.

Does M29W128FT70N6E support x8 and x16 data bus widths simultaneously?

No. The BYTE pin selects bus width at power-up: logic high enables x16 mode (DQ0–DQ15 active), logic low enables x8 mode (DQ0–DQ7 active, DQ15 functions as A-1). The device operates in one mode per power cycle; dynamic switching between widths is not supported.

How is the Extended Block protected, and can protection be reversed?

The Extended Block (256 bytes) is protected via a dedicated CFI command sequence. Once locked, protection is irreversible - no command or voltage sequence can unlock it. This design ensures cryptographic keys or calibration data remain permanently secure after initial programming.

What is the role of the RB (Ready/Busy) pin during erase operations?

The RB pin is an open-drain output that goes low during active Program or Erase operations and returns high upon completion or error detection. It provides hardware handshaking for microcontrollers to avoid polling - critical for deterministic timing in real-time systems where interrupt latency must be minimized.