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STMicroelectronics M93S56-WMN6TP
- Part No.:
- M93S56-WMN6TP
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M93S56-WMN6TP.pdf
- Description:
- IC EEPROM 2KBIT SPI 2MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:732
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Product details
Overview
M93S56-WMN6TP from STMicroelectronics is a 2 Kbit (128 × 16-bit) serial EEPROM with MICROWIRE bus interface, user-configurable write protection, and OTP-locked protection register. It operates from 2.5 V to 5.5 V, supports 2 MHz clock, delivers ≤5 ms page/byte write time, and guarantees >4 million write cycles with >200-year data retention. Used in industrial control panels for parameter storage and calibration persistence.
For engineers reviewing the M93S56-WMN6TP datasheet, M93S56-WMN6TP pinout, M93S56-WMN6TP application, or M93S56-WMN6TP equivalent, key selection criteria include MICROWIRE compatibility, 8-pin SO8 package footprint, programmable protection register, 16-bit word organization, and -40 °C to +85 °C industrial temperature operation.
Technical Context
The M93S56-WMN6TP implements a synchronous serial MICROWIRE interface with strict clock-edge sampling: data input (D) latched on rising C edge after S activation, output (Q) updated post-rising C edge. All instructions-READ, WRITE, PAWRITE, WRAL, and protection register commands-are validated by an on-chip pulse counter that aborts execution if clock cycle count deviates from expected values (e.g., 27 cycles for WRITE).
It features dual-level write protection: software-defined via 8-bit Protection Register (PR), and hardware-permanent via One-Time-Programmable (OTP) bit that locks PR content. The device enters Standby Power mode when S is low and includes internal power-on reset (POR) to prevent spurious writes during voltage ramp-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (128 words × 16 bits); enables compact storage of configuration registers or calibration coefficients without external address decoding. |
| Interface protocol | MICROWIRE serial bus; compatible with legacy microcontrollers lacking SPI hardware but supporting 3-wire synchronous serial I/O. |
| Write time | ≤5 ms per byte or page; allows deterministic firmware timing for non-blocking write completion checks using Q busy signal. |
| Supply voltage | 2.5 V to 5.5 V; supports direct interfacing with 3.3 V and 5 V logic families without level shifters. |
| Temperature range | -40 °C to +85 °C; qualified for use in industrial automation controllers and outdoor metering equipment. |
| Data retention | >200 years at 25 °C; ensures long-term reliability of stored settings across product lifetime without refresh. |
| Endurance | >4 million write cycles; accommodates frequent field updates such as energy meter tariff changes or sensor recalibration logs. |
Pinout & Package
Package: SO8 (MN), 8-lead plastic small outline, 150 mil body width, ECOPACK®2 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S | Chip select input | Active-low enable; places device in Active Power mode when high, forces Q into high-impedance when low. |
| D | Serial data input | Latches instruction op-codes, addresses, and write data on rising edge of C; MSB-first protocol. |
| Q | Serial data output | Drives read data and protection register contents; outputs busy signal during internal write cycles. |
| C | Serial clock input | Provides synchronous timing; all D/Q transitions referenced to rising edge; max 2 MHz frequency. |
| PRE | Protection register enable | High-active control for accessing protection register; must be asserted before PRREAD/PRWRITE instructions. |
| W | Hardware write protect | Low disables all memory writes; must be actively driven-not left floating-to ensure reliable protection state. |
| VSS | Ground reference | Return path for VCC; requires local 10–100 nF decoupling capacitor near package pins for noise immunity. |
| VCC | Supply voltage | Single 2.5–5.5 V rail; internal POR prevents writes until stable VCC exceeds reset threshold. |
Key Features
| Feature | Design Value |
|---|---|
| User-defined write protection area | Configurable via 8-bit Protection Register; allows selective locking of critical calibration or security parameters while leaving other sectors writable. |
| One-Time-Programmable (OTP) lock | Permanently freezes Protection Register content after programming; prevents runtime tampering with protected region boundaries. |
| Page write capability | Writes up to 4 consecutive 16-bit words (64 bits total) in one ≤5 ms cycle; reduces firmware overhead vs. individual byte writes. |
| Ready/Busy signaling | Q pin asserts low during internal write; enables polling-based synchronization without fixed delay loops or interrupts. |
| No pre-erase requirement | Direct write to any unsecured location; eliminates erase/write latency and simplifies firmware update routines. |
Applications
| Industrial PLC Configuration Storage | Smart Energy Meter Calibration Data |
|---|---|
|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Non-volatile configuration register; retains settings across power cycles and firmware upgrades. Use Value: Enables field reconfiguration without hardware change; 200-year retention ensures integrity over multi-decade equipment lifespan. |
Use Scenario: Holding metrology calibration constants, tariff tables, and firmware version stamps in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: Secure parameter vault; OTP-locked protection register prevents unauthorized modification of revenue-critical values. Use Value: Meets ANSI/IEC anti-tampering requirements; >4M endurance supports daily firmware patch logging and seasonal tariff updates. |
| Automotive Body Control Module Settings | Medical Infusion Pump Safety Parameters |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and CAN node configuration in 12 V automotive BCMs operating at ambient -40 °C to +85 °C. IC Role / Device Role / Timing Role: Low-voltage EEPROM; interfaces directly to 3.3 V MCU via MICROWIRE without level translation. Use Value: 2.5 V min supply enables operation during cold-crank battery dips; SO8 package fits tight PCB layouts in junction boxes. |
Use Scenario: Storing drug library limits, occlusion pressure thresholds, and audit trail timestamps in Class IIa infusion pumps requiring IEC 62304 compliance. IC Role / Device Role / Timing Role: Fail-safe configuration store; write-protection prevents runtime corruption of life-critical safety bounds. Use Value: >200-year retention satisfies FDA long-term traceability mandates; 8-pin SO8 allows easy replacement during service without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25020B-MAHL-T | SPI interface (not MICROWIRE); 2 Kbit, 1.8–5.5 V, 20 MHz max clock; no OTP protection register. | Requires SPI-capable MCU; lacks hardware-enforced permanent protection; suited for cost-sensitive consumer designs. | Select only if existing design uses SPI and does not require OTP-locked configuration security. |
| M95256-WMN6TP | MICROWIRE-compatible but 256 Kbit (16 K × 16); same SO8 package; no OTP bit; uses W pin for software-controlled protection only. | Higher density for firmware patch storage; no permanent lock-protection can be reconfigured in-field. | Choose when larger capacity is needed and permanent protection is unnecessary; shares footprint and voltage range. |
Compared with AT25020B-MAHL-T and M95256-WMN6TP, the M93S56-WMN6TP uniquely combines MICROWIRE compatibility, OTP-locked protection, and industrial-grade endurance in an SO8 package-making it optimal for legacy MCU platforms requiring tamper-resistant parameter storage.
Availability
M93S56-WMN6TP is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, automotive body control modules, and medical infusion pumps requiring stable component supply across extended product lifecycles.
Supply support for M93S56-WMN6TP 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 microcontrollers, power ICs, sensors, and memory products for industrial, automotive, and consumer markets.
The M93Sxx-W series targets cost-sensitive, space-constrained embedded systems needing reliable, low-pin-count serial EEPROM with configurable and permanent write protection-especially where legacy MICROWIRE support is required.
FAQ
Is the M93S56-WMN6TP pin-compatible with the M93S46-W or M93S66-W?
Yes-M93S56-WMN6TP shares identical SO8 (MN) pinout and MICROWIRE interface signals with M93S46-W and M93S66-W. All three use the same 8-pin layout (S, D, Q, C, PRE, W, VSS, VCC), enabling drop-in replacement within the same family when memory size requirements change. However, address depth differs: M93S46 uses 6-bit addressing, M93S56/M93S66 use 8-bit addressing, so firmware must match the selected device's instruction set.
What happens if the W pin is left floating during operation?
Leaving the W pin floating violates the absolute maximum ratings and may cause unpredictable write-enable behavior. The datasheet explicitly states W must be actively driven high or low-never left open. Floating W can result in partial or intermittent write blocking, risking data corruption. A pull-up or pull-down resistor (typically 10 kΩ) is required to ensure deterministic protection state at power-up and during noise events.
Can the OTP bit be cleared once programmed?
No-the One-Time-Programmable (OTP) bit is physically fused during programming and cannot be reversed. Once set, the Protection Register becomes permanently locked, preventing any further modification to its content or the protected memory region boundaries. This irreversible action is intended for final production programming to meet security or regulatory requirements.
Does the M93S56-WMN6TP support read-before-write verification?
No-it does not perform automatic read-before-write verification. The device executes WRITE or PAWRITE instructions unconditionally if the target address lies outside the protected area. Firmware must implement explicit read-verify sequences if data integrity assurance is required, leveraging the READY/Busy signal on Q to synchronize post-write reads.
M93S56-WMN6TP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 128 x 16
- Memory Interface:
- SPI
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
M93S56-WMN6TP FAQ
1.How can I place an order for M93S56-WMN6TP through Aetrix?
Please submit a Request for Quotation (RFQ) for M93S56-WMN6TP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for M93S56-WMN6TP reliable?
The price and inventory of M93S56-WMN6TP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M93S56-WMN6TP is usually 5 days.
3.What payment methods are accepted for M93S56-WMN6TP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M93S56-WMN6TP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M93S56-WMN6TP?
M93S56-WMN6TP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M93S56-WMN6TP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for M93S56-WMN6TP?
For technical support, including M93S56-WMN6TP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M93S56-WMN6TP requirements.
6.How does Aetrix verify that M93S56-WMN6TP is sourced from the original manufacturer or authorized distributors?
All M93S56-WMN6TP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M93S56-WMN6TP meets industry standards.
7.What is the process for return or replacement of M93S56-WMN6TP?
All M93S56-WMN6TP units undergo pre-shipment inspection (PSI). If there is an issue with M93S56-WMN6TP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The M93S56-WMN6TP part is unused and in its original packaging.
Return procedure for M93S56-WMN6TP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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