STMicroelectronics

M93C56-WDW6TP

A: The M93C56-WDW6TP is designed for a wide operating voltage range, low power consumption, and high reliability. The table below summarizes its core specifications, drawn directly from manufacturer data and multiple distributor sources: Specification Value Memory Density 2 Kbit (256 Bytes) Memory Organization 256 × 8 bits or 128 × 16 bits (configurable) Memory Technology EEPROM (Non-Volatile) Memory Interface MICROWIRE™ (3-wire serial) bus Clock Frequency (fCLK) 2 MHz (max) Access Time (tAA) 200 ns (max) Write Cycle Time (tWC) 5 ms (max, self-timed) Supply Voltage (VCC) 2.5 V to 5.5 V Active Supply Current 2 mA (max) Standby Current 5 µA (max) Write Endurance 1,000,000 (1 million) write cycles (minimum) Data Retention 40 years (minimum) Operating Temperature (Industrial) –40°C to +85°C Package Type 8‑pin TSSOP (4.4 mm × 3.0 mm) Moisture Sensitivity Level (MSL) 1 (unlimited) — No special handling required RoHS Status ROHS3 Compliant (ECOPACK®) Product Lifecycle Status Conflicting (Refer to Section 5) Additional features include: Industry standard MICROWIRE™ bus for simplified connection to a wide range of microcontrollers and SoCs. Self‑timed programming cycle with auto-erase (5 ms) – No external timing control required. READY/BUSY signal during programming – Provides hardware status monitoring during write cycles. Sequential read operation – Allows the entire memory to be read in a single continuous operation. Enhanced ESD/latch-up behavior – Provides robust immunity to electrostatic discharge events and latch-up. Programming instructions that work on byte, word, or entire memory – Flexible memory management. Built‑in Power-On Reset (POR) and Write Enable Latch (WEL) – Prevent accidental writes during power‑up and power‑down transitions. Noise suppression function – Provides enhanced noise immunity on the input pins.

A: The M93C56-WDW6TP uses a standard MICROWIRE™ (3‑wire serial) bus for communication, which is a widely adopted serial protocol supported by a broad range of microcontrollers and SoCs [6†L22-L24]. The interface consists of the following signals: Signal Function CS (Chip Select) Enables the device when driven high (active‑high chip select) CLK (Serial Clock) Provides the clock signal for data transfer (up to 2 MHz) D (Serial Data Input) Transmits data (opcodes, addresses, and write data) from the host to the device Q (Serial Data Output) Transmits read data from the device to the host Communication is initiated by driving the Chip Select (CS) pin high. The first bit transmitted after CS goes high is the Start bit (logic '1'), followed by a 2‑bit Opcode that defines the operation to be performed (READ, WRITE, ERASE, WRAL, ERAL, etc.) [8†L15-L16]. After the Opcode, the device expects address and data bits depending on the selected operation. The device supports both x8 (byte) and x16 (word) organization, and the instruction set includes commands for byte/word programming, byte/word read, erase, and bulk operations. The self‑timed programming cycle with auto‑erase ensures that the address is automatically erased before writing, simplifying the software control loop [6†L27-L28]. During the internal write cycle, the device outputs the READY/BUSY signal (on the Q pin) which the host can monitor to determine when the write operation has completed [6†L28].

A: The M93C56-WDW6TP is engineered for long‑term reliability. The table below outlines its key reliability specifications: Reliability Parameter Specification Write Endurance 1,000,000 (1 million) write/erase cycles (minimum) [6†L29-L30] Data Retention 40 years (minimum) [6†L30] Write Cycle Time 5 ms (max, self‑timed) [9†L6-L7] Operating Temperature (Industrial) –40°C to +85°C These specifications, particularly the 1 million write cycles and 40‑year data retention, make the device well‑suited for applications that require occasional data updates (e.g., storing configuration parameters, device serial numbers, calibration constants) while also guaranteeing long‑term data integrity.

A: The M93C56-WDW6TP is well‑suited for a broad range of embedded applications requiring small-capacity, non‑volatile storage with a simple, low‑pin‑count 3‑wire interface. Its flexible x8/x16 organization allows it to interface easily with processors of varying bus widths. Typical use cases include: Industrial control systems – Storing configuration parameters, calibration constants, and operational logs in PLCs, sensors, and measurement equipment. Consumer electronics – Storing user settings, device preferences, and calibration constants in smart appliances, wearables, and portable devices. Medical devices – Securely storing critical device identification, calibration information, and usage logs in diagnostic equipment. Automotive electronics – For engine control units (ECUs), body control modules, and infotainment systems (industrial‑grade) [8†L13-L14]. Telecommunications equipment – Storing board‑specific configuration data and system parameters. ⚠️ Important Lifecycle Information: The product lifecycle status for the M93C56-WDW6TP is contradictory across authoritative sources: Active Status: Multiple distributor sources explicitly list the Part Status as Active — Datasheet5 shows "生命周期: Active" [7†L5-L6], Arrow Electronics lists the part as Active with ECCN EAR99 [10†L4-L6], and Unikey also shows Active status [11†L5-L6]. Not Recommended for New Designs (NRND): However, some other major distributor sources list the part as Not For New Designs or NRND (Not Recommended for New Designs), with one source listing the part status as "Not For New Designs" and another linking to a replacement recommendation page suggesting the M93C56‑WMN6TP (SO8N package) and M93C56‑RDW6TP (TSSOP‑8, 1.8V variant) as potential alternatives. According to STMicroelectronics' official product lifecycle policy, the M93Cx6‑W series (2.5V-5.5V) is an older generation; the manufacturer actively recommends the M93C56‑R series (1.8V-5.5V, extended voltage range) for new designs. ST's eStore displays the more active replacement model as M93C56‑R when searching for this series. Given the conflicting lifecycle reports, engineers are strongly advised to verify current lifecycle status, availability, and lead times directly with an authorised STMicroelectronics distributor (such as DigiKey, Mouser, Farnell, or Arrow) before committing this part to a new high‑volume design. For projects requiring long‑term supply assurance, the M93C56-RDW6TP (TSSOP‑8, 1.8V to 5.5V, extended voltage range) or the M93C56-WMN6TP (SO8 package, 2.5V-5.5V) may offer better long‑term availability, as they remain actively in production and recommended by ST for new designs.