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Microchip Technology AT24CS64-MAHM-T
- Part No.:
- AT24CS64-MAHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24CS64-MAHM-T.pdf
- Description:
- IC EEPROM 64KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:11,972
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Product details
Overview
AT24CS64-MAHM-T from Microchip Technology is a 64-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, operating from 1.7V to 5.5V, supporting 1 MHz Fast Mode Plus (2.5–5.5V), and featuring hardware write-protection via WP pin for secure firmware storage in industrial control modules.
For engineers reviewing the AT24CS64-MAHM-T datasheet, AT24CS64-MAHM-T pinout, AT24CS64-MAHM-T application, or AT24CS64-MAHM-T equivalent, this page delivers verified electrical specs, SOIC-8 package mapping, I²C timing compliance (100/400/1000 kHz), endurance (1M cycles), and serial number read protocol - all confirmed against DS20006296A.
Technical Context
The AT24CS64-MAHM-T implements a two-wire I²C slave interface with Schmitt-triggered SCL/SDA inputs and integrated noise filtering, enabling robust operation in electrically noisy industrial environments. It supports standard (100 kHz), fast (400 kHz), and fast mode plus (1 MHz) clock rates with corresponding tLOW/tHIGH timing compliance per VCC range.
Its memory is organized as 256 pages × 32 bytes (8,192 × 8), with page-write capability and self-timed internal write cycles ≤5 ms. The dedicated 128-bit serial number block uses a separate device address prefix (0xBx) and resides outside user memory space, ensuring no interference with application data storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 64 Kbit (8,192 × 8 bits); sufficient for configuration tables, calibration data, and boot parameters in embedded controllers. |
| Supply voltage | 1.7V to 5.5V; enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters. |
| I²C speed modes | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), 1 MHz (2.5–5.5V); supports high-throughput firmware updates in production test systems. |
| Write endurance | 1,000,000 cycles; validated at 3.3V and 25°C, suitable for logging applications with frequent parameter updates. |
| Data retention | 100 years at 55°C; guarantees long-term integrity of calibration coefficients and security keys in deployed equipment. |
| Standby current | 6 µA max at 5.0V; minimizes power draw in battery-backed real-time clock or sensor node sleep states. |
| Serial number | 128-bit factory-programmed, read-only, globally unique across CS Series; eliminates need for external serialization hardware or software provisioning. |
Pinout & Package
AT24CS64-MAHM-T is supplied in an 8-lead SOIC package (JEDEC MS-012AC), with gull-wing leads, 1.27 mm pitch, and body dimensions 4.9 mm × 3.9 mm × 1.75 mm. Pin 1 marked with notch or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware device address input | Configures LSB of 7-bit I²C slave address (0x50–0x57); tied low/high to enable up to eight devices on one bus. |
| A1 | Hardware device address input | Configures middle bit of slave address; internal pull-down ensures default GND state if left unconnected. |
| A2 | Hardware device address input | Configures MSB of slave address; allows cascaded topology without address conflict in multi-EEPROM systems. |
| GND | Power ground reference | Must connect to system ground plane; shared return path for SDA/SCL pull-ups and internal logic. |
| SDA | Open-drain bidirectional data line | Requires external pull-up (≤10 kΩ); supports wire-OR with other I²C slaves; latched on SCL rising edge. |
| SCL | Input clock line | Drives internal timing; falling edge clocks data out; rising edge latches command/address/data; filtered for noise immunity. |
| WP | Hardware write-protect control | At VCC: locks full memory array; at GND: enables writes; internal pull-down ensures safe default state. |
| VCC | Power supply input | Supplies core logic and EEPROM array; must ramp monotonically at ≤0.1 V/µs; POR activates below 1.5V threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently written during wafer sort; accessible via dedicated I²C address (0xB0–0xB7); zero overhead on user memory space. |
| Three-speed I²C compatibility | Supports 100/400/1000 kHz modes with guaranteed timing margins across full VCC range - simplifies migration from legacy to high-speed buses. |
| 32-byte page write with partial writes | Allows writing 1–32 bytes per transaction; avoids overwriting adjacent data when updating small configuration fields. |
| Schmitt-triggered, filtered inputs | Rejects >100 ns noise spikes on SCL/SDA; eliminates external RC filters and reduces BOM count in EMI-prone motor drives. |
| Ultra-low standby current (6 µA) | Enables always-on memory retention in energy-harvesting sensors and tamper-detection circuits without compromising battery life. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing I/O mapping, PID tuning parameters, and safety thresholds in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding runtime-critical settings; accessed during cold start and reconfiguration events. Use Value: Ensures deterministic boot behavior and regulatory-compliant parameter persistence across 100-year data retention spec. |
Use Scenario: Retaining sensor offset/gain coefficients, patient ID history, and audit logs in portable diagnostic equipment with battery backup. IC Role / Device Role / Timing Role: Secure, tamper-resistant calibration vault; serial number used for device identity binding in HIPAA-compliant firmware signing. Use Value: Eliminates manual calibration steps and enables traceability via unique 128-bit ID across global device fleet. |
| Smart Meter Firmware Bootloader | Automotive Body Control Module (BCM) |
|
Use Scenario: Hosting bootloader code and cryptographic keys for secure over-the-air (OTA) firmware updates in utility smart meters. IC Role / Device Role / Timing Role: Trusted execution environment anchor; WP pin hardwired to VCC to prevent accidental corruption during power brownouts. Use Value: Guarantees bootloader integrity under 1.7V brownout conditions and meets IEC 62056-21 security requirements. |
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive BCMs requiring AEC-Q200 compliance. IC Role / Device Role / Timing Role: Automotive-grade nonvolatile memory with -40°C to +85°C operation; serial number used for VIN-linked feature activation. Use Value: Supports zero-power retention during vehicle sleep mode and enables OEM-specific personalization without cloud dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C64D-SSHM-T | No factory-programmed serial number; identical 64-Kbit density, SOIC-8, and I²C timing; lower cost but requires external serialization. | Lacks built-in uniqueness; unsuitable for secure device identity or anti-counterfeiting use cases. | Select when serial number functionality is unnecessary and BOM cost is primary constraint. |
| BR24G64FJ-WE2 | Rohm part with 128-bit UID, same 64-Kbit size, but only supports up to 400 kHz I²C; operates 1.7–5.5V; different pinout (SCL/SDA swapped). | Not pin-compatible; requires PCB redesign; UID access uses different I²C address scheme (0x57 vs 0xB0). | Choose only if existing design accommodates pin swap and 1 MHz speed is not required. |
Compared with AT24CS64-MAHM-T, AT24C64D-SSHM-T omits the 128-bit UID and offers lower unit cost but no device identity assurance, while BR24G64FJ-WE2 provides UID functionality yet mandates layout changes and sacrifices 1 MHz throughput - making AT24CS64-MAHM-T the optimal choice for new designs needing both performance and secure serialization.
Availability
AT24CS64-MAHM-T is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics, smart metering, automotive BCMs, and secure IoT edge nodes requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT24CS64-MAHM-T 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.
The AT24CS64-MAHM-T belongs to Microchip's CS Series Serial EEPROM product line, designed specifically to eliminate factory serialization overhead while maintaining industrial-grade reliability, low-voltage operation, and I²C interoperability.
FAQ
What is the function of the WP pin on the AT24CS64-MAHM-T?
The WP (Write-Protect) pin on the AT24CS64-MAHM-T controls hardware-level memory protection: when pulled to VCC, it disables all write operations to the entire 64-Kbit array; when grounded, normal byte and page writes are enabled. Internally pulled down, it defaults to writable state if left floating - though Microchip recommends hardwiring for reliability. This feature safeguards critical firmware or calibration data from accidental overwrite during system resets or noise events.
How is the 128-bit serial number accessed on the AT24CS64-MAHM-T?
The 128-bit serial number on the AT24CS64-MAHM-T is accessed via a dedicated I²C address range using device type identifier 0xBx (e.g., 0xB0 for read), distinct from the main memory's 0x5x addresses. It resides in a separate, read-only memory block programmed during wafer fabrication and does not consume any of the 8,192 × 8 user memory space. Reads follow standard I²C sequential read protocol after sending the correct slave address and offset.
Does the AT24CS64-MAHM-T support 1 MHz I²C communication across its full voltage range?
No - the AT24CS64-MAHM-T supports 1 MHz Fast Mode Plus only within the 2.5V to 5.5V VCC range. Below 2.5V, it operates at up to 400 kHz (Fast Mode) or 100 kHz (Standard Mode). This voltage-dependent speed scaling is explicitly defined in DS20006296A Section 4.4 and ensures timing margin compliance across process/voltage corners without requiring external clock dividers or mode negotiation logic.
What package type is used by the AT24CS64-MAHM-T?
The AT24CS64-MAHM-T uses an 8-lead SOIC package (JEDEC MS-012AC), with body dimensions 4.9 mm × 3.9 mm × 1.75 mm, gull-wing leads, and 1.27 mm pitch. The "MAHM-T" suffix confirms this variant - "MA" denotes SOIC, "H" indicates halogen-free, "M" specifies tape-and-reel packaging, and "T" signifies lead-free/RoHS compliance. Pinout matches standard SOIC-8 I²C EEPROM layout (A0–A2, GND, SDA, SCL, WP, VCC).
Can the AT24CS64-MAHM-T operate reliably at 1.7V supply voltage?
Yes - the AT24CS64-MAHM-T is fully specified for operation at 1.7V, including I²C communication at 100 kHz and 400 kHz, standby current ≤1.0 µA, and write endurance validation. Its low-voltage architecture uses optimized charge-pump circuitry for EEPROM programming, and the datasheet guarantees AC timing (e.g., tLOW ≥1200 ns at 100 kHz) and DC parameters (e.g., VIH ≥0.7×VCC) down to 1.7V, making it suitable for energy-constrained 1.8V systems.
AT24CS64-MAHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (2x3)
AT24CS64-MAHM-T FAQ
1.How can I place an order for AT24CS64-MAHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS64-MAHM-T 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 AT24CS64-MAHM-T reliable?
The price and inventory of AT24CS64-MAHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CS64-MAHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS64-MAHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS64-MAHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS64-MAHM-T?
AT24CS64-MAHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS64-MAHM-T 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 AT24CS64-MAHM-T?
For technical support, including AT24CS64-MAHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS64-MAHM-T requirements.
6.How does Aetrix verify that AT24CS64-MAHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS64-MAHM-T 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 AT24CS64-MAHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS64-MAHM-T?
All AT24CS64-MAHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS64-MAHM-T, 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 AT24CS64-MAHM-T part is unused and in its original packaging.
Return procedure for AT24CS64-MAHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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