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Microchip Technology 24CS256T-I/MS
- Part No.:
- 24CS256T-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
24CS256T-I/MS.pdf
- Description:
- IC EEPROM 256KBIT I2C 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,206
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Product details
Overview
24CS256T-I/MS from Microchip Technology is a 256-Kbit I²C serial EEPROM organized as 32,768 × 8-bit, featuring 3.4 MHz High-Speed mode support, built-in ECC for single-bit error correction, 128-bit factory-programmed serial number, and dual write protection (hardware WP pin + software-configurable zone locking). It operates across 1.7V–5.5V and is AEC-Q100 qualified for automotive infotainment and body control modules.
For engineers reviewing the 24CS256T-I/MS datasheet, 24CS256T-I/MS pinout, 24CS256T-I/MS application, or 24CS256T-I/MS equivalent, key selection considerations include its 8-lead MSOP package with A0/A1/A2 address pins, 5 ms max self-timed write cycle, 1 µA standby current at 5.5V, ECC latch reporting via Configuration register, and compatibility with legacy 24AA256/24LC256 devices in shared-bus systems.
Technical Context
The 24CS256T-I/MS implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its memory architecture supports byte and page writes (up to 64 bytes per page) within a single 32-Kbyte array, plus a separate 1-Kbit Security register containing a read-only 128-bit serial number and user-lockable 64-byte ID page.
Device operation is governed by three register types: Configuration register (enables enhanced software write protection across eight independent 32-Kbit zones), Security register (factory-programmed serial number + programmable ID), and Manufacturer ID register (24-bit I²C-compliant identifier). Write protection can be enforced either via the hardware WP pin or through software configuration - with the Configuration register lockable to prevent further changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbits (32,768 × 8-bit), organized as 512 pages of 64 bytes each |
| I²C Speed Modes | Up to 3.4 MHz High-Speed mode (2.5V–5.5V, Industrial temp); also supports 1 MHz / 400 kHz / 100 kHz |
| Write Cycle Time | ≤5 ms maximum for byte or page writes; self-timed with no external timing required |
| Operating Voltage | 1.7V to 5.5V - enables direct interfacing with 1.8V, 2.5V, 3.3V, and 5V microcontrollers |
| Reliability | 1 million erase/write cycles; >200 years data retention at 55°C; built-in ECC corrects up to one bit per 4-byte read |
| Security Features | Factory-programmed 128-bit globally unique serial number; 64-byte user-programmable & lockable ID page |
| Protection Options | Hardware WP pin for full-array protection; software-configurable zone locking via Configuration register |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), RoHS-compliant, rated for Industrial temperature (-40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | LSB of 3-bit hardware client address; sets device I²C address (000–111) when multiple units share bus |
| A1 | Device Address Input | Middle bit of 3-bit hardware client address; enables up to eight 24CS256T-I/MS devices on same I²C bus |
| A2 | Device Address Input | MSB of 3-bit hardware client address; must be hardwired to VSS or VCC (not floating) |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O; requires low-impedance connection to system ground |
| SDA | Serial Data Line | Open-drain bidirectional I²C data line; requires external pull-up resistor (e.g., 2 kΩ for 400 kHz) |
| VCC | Power Supply | Single supply input (1.7V–5.5V); powers EEPROM core, logic, and I/O buffers |
| WP | Write-Protect Control | Active-high hardware lock; when tied to VCC, disables all writes to memory and Security register |
| SCL | Serial Clock Input | Input-only I²C clock line; synchronizes all data transfers; slope-controlled for EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Backward Compatibility | Fully compatible with 24AA256/24LC256/24FC256 and AT24C256C - simplifies drop-in replacement in existing designs |
| Enhanced Software Protection | Configuration register allows per-zone (32-Kbit) write locking - enables selective firmware parameter protection without disabling full array |
| Integrated ECC Logic | Corrects single-bit errors during reads and reports correction status via Error Correction State (ECS) latch in Configuration register |
| I²C Manufacturer ID Support | Returns unique 24-bit ID on command - enables automatic device identification and firmware validation in multi-EEPROM systems |
| Low-Power Operation | 1 µA standby current at 5.5V (I-Temp) and 1 mA read current - extends battery life in portable and automotive applications |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing calibration data, door lock settings, and seat position profiles in vehicle body control units. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with AEC-Q100 qualification and ECC for fault-tolerant operation in harsh environments. Use Value: Prevents data corruption due to voltage transients or EMI; 128-bit serial number enables secure unit-level traceability in production. | Use Scenario: Retaining I/O mapping, PID tuning parameters, and firmware update flags across power cycles in programmable logic controllers. IC Role / Device Role / Timing Role: Reliable parameter storage interfaced directly to 3.3V ARM Cortex-M microcontrollers via I²C. Use Value: 3.4 MHz High-Speed mode reduces configuration load time; software zone locking prevents accidental overwrites of critical control parameters. |
| Consumer Smart Appliance UI Settings | Medical Diagnostic Equipment Calibration |
Use Scenario: Saving user preferences (brightness, language, timer defaults) in washing machines and ovens. IC Role / Device Role / Timing Role: Low-voltage (1.7V–5.5V) EEPROM supporting mixed-voltage SoC interfaces and long-term data retention. Use Value: >200-year data retention ensures settings persist over product lifetime; 64-byte lockable ID page stores encrypted device keys. | Use Scenario: Storing sensor offset values, gain coefficients, and regulatory compliance logs in portable ultrasound and ECG devices. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory with factory-unique serial number for audit trail and anti-counterfeiting. Use Value: ECC guarantees integrity of calibration data; preprogrammed serial number eliminates post-manufacturing serialization steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA256-I/MS | No ECC; no Security register; max I²C speed = 1 MHz; no AEC-Q100 qualification | Lacks error correction and serial number - unsuitable for safety-critical or traceability-required applications | Select only for cost-sensitive, non-automotive designs where ECC and serialization are unnecessary |
| AT24C256C-SSHL-T | No built-in ECC; no 128-bit serial number; no enhanced software write protection; max I²C speed = 1 MHz | Compatible pinout but lacks security and reliability features - requires external error handling and serialization logic | Choose when migrating legacy Atmel-based designs with minimal feature requirements and no automotive certification needs |
Compared with 24AA256-I/MS and AT24C256C-SSHL-T, the 24CS256T-I/MS delivers higher reliability via ECC, stronger security via factory-unique ID and lockable zones, and broader system compatibility via 3.4 MHz I²C and AEC-Q100 qualification - making it the preferred choice for next-generation automotive and industrial control systems.
Availability
24CS256T-I/MS is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, consumer smart appliances, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant memory solutions.
Supply support for 24CS256T-I/MS 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
Microchip Technology Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, serving automotive, industrial, communications, and consumer markets with high-reliability silicon and development tools.
The 24CS256 series is designed specifically for applications demanding robust nonvolatile storage with integrated security, ECC, and automotive-grade qualification - targeting body electronics, ADAS subsystems, and mission-critical industrial controllers.
FAQ
What is the maximum I²C clock frequency supported by the 24CS256T-I/MS?
The 24CS256T-I/MS supports up to 3.4 MHz in High-Speed mode when operating at 2.5V–5.5V and within the Industrial temperature range (-40°C to +85°C). At lower voltages (1.7V–2.5V) or extended temperature, the maximum clock frequency is limited to 1 MHz. This enables faster configuration loading compared to standard 400 kHz EEPROMs while maintaining signal integrity via slope-controlled outputs.
Does the 24CS256T-I/MS require external components for I²C bus operation?
Yes - the 24CS256T-I/MS requires external pull-up resistors on both SDA and SCL lines. Recommended values are 2 kΩ for 400 kHz operation and 330 Ω for 3.4 MHz High-Speed mode. No external capacitors or voltage translators are needed, as the device operates natively from 1.7V to 5.5V and includes Schmitt-trigger inputs for noise immunity.
How does the built-in ECC in the 24CS256T-I/MS function during read operations?
The 24CS256T-I/MS applies ECC correction automatically during every read operation across four-byte boundaries. If a single-bit error is detected and corrected, the Error Correction State (ECS) latch in the Configuration register is set. This latch remains asserted until cleared by software, enabling firmware to log or respond to memory integrity events - a capability absent in standard EEPROMs like the 24AA256-I/MS.
Can the 128-bit serial number in the 24CS256T-I/MS be overwritten or modified?
No - the 128-bit serial number in the 24CS256T-I/MS is factory-programmed, globally unique across the entire CS series, and permanently read-only. It resides in the first 16 bytes of the Security register (address 0800h–080Fh) and cannot be altered, erased, or reprogrammed. This ensures unambiguous device identification for traceability, anti-counterfeiting, and secure boot applications.
What write protection mechanisms does the 24CS256T-I/MS offer beyond the WP pin?
In addition to the hardware WP pin, the 24CS256T-I/MS provides enhanced software write protection via its Configuration register. This allows users to lock any of eight independent 32-Kbit memory zones individually. Once configured, the Configuration register itself can be permanently locked to prevent further changes - offering granular, irreversible protection for firmware parameters, calibration data, or security keys without disabling full-array access.
24CS256T-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 3.4 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 70 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
24CS256T-I/MS FAQ
1.How can I place an order for 24CS256T-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CS256T-I/MS 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 24CS256T-I/MS reliable?
The price and inventory of 24CS256T-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24CS256T-I/MS is usually 5 days.
3.What payment methods are accepted for 24CS256T-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CS256T-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CS256T-I/MS?
24CS256T-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CS256T-I/MS 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 24CS256T-I/MS?
For technical support, including 24CS256T-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CS256T-I/MS requirements.
6.How does Aetrix verify that 24CS256T-I/MS is sourced from the original manufacturer or authorized distributors?
All 24CS256T-I/MS 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 24CS256T-I/MS meets industry standards.
7.What is the process for return or replacement of 24CS256T-I/MS?
All 24CS256T-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 24CS256T-I/MS, 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 24CS256T-I/MS part is unused and in its original packaging.
Return procedure for 24CS256T-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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