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Microchip Technology AT24CS64-MAHM-E
- Part No.:
- AT24CS64-MAHM-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24CS64-MAHM-E.pdf
- Description:
- IC EEPROM 64KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,490
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Product details
Overview
AT24CS64-MAHM-E 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, and featuring hardware write protection (WP), 32-byte page write, and industrial temperature range (–40°C to +85°C). It serves as nonvolatile configuration storage in embedded systems requiring traceability and secure device identification.
For engineers reviewing the AT24CS64-MAHM-E datasheet, AT24CS64-MAHM-E pinout, AT24CS64-MAHM-E application, or AT24CS64-MAHM-E equivalent, this page delivers verified electrical specs, validated pin functions, confirmed package mapping (8-pad UDFN), real-world use cases, and two technically documented alternative parts for design-in flexibility.
Technical Context
The AT24CS64-MAHM-E implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) speeds across its full 1.7V–5.5V VCC range. Its memory is organized as 256 pages × 32 bytes, enabling partial-page writes and sequential reads without address wraparound.
It integrates a dedicated 128-bit read-only serial number block addressed separately via device type identifier '1011b', physically isolated from user memory and permanently programmed during wafer fabrication. The WP pin provides hardware-level full-array write inhibition when driven high, while A0–A2 pins enable up to eight devices on one bus via hardwired addressing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits), organized as 256 pages of 32 bytes - enables efficient firmware parameter storage with minimal address overhead. |
| VCC Range | 1.7V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifting. |
| I²C Speed Modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (FM+) - FM+ support at ≥2.5V allows high-throughput configuration updates in time-critical boot sequences. |
| Write Endurance | 1,000,000 cycles - ensures reliable logging of calibration data or field-updated settings over product lifetime. |
| Data Retention | 100 years at 55°C - guarantees long-term integrity of device identity and security-critical parameters in unattended deployments. |
| Standby Current | 6 µA max at 5.0V - minimizes quiescent power in battery-backed or energy-harvesting systems. |
| Serial Number | 128-bit factory-programmed, permanent, read-only, unique across entire CS Series - eliminates need for external serialization hardware or post-manufacturing programming steps. |
Pinout & Package
AT24CS64-MAHM-E is packaged in an 8-pad UDFN (2 mm × 3 mm, 0.5 mm pitch) with wettable flanks, RoHS-compliant and halide-free. The exposed pad is optional and may be connected to GND or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware Device Address Input | Configures LSB of 3-bit slave address; internally pulled down if floating - enables multi-device bus topology with deterministic addressing. |
| A1 | Hardware Device Address Input | Configures middle bit of 3-bit slave address; internal weak pull-down avoids floating-state uncertainty in PCB layout. |
| A2 | Hardware Device Address Input | Configures MSB of 3-bit slave address; combined with A0/A1, supports up to eight AT24CS64-MAHM-E devices on one I²C bus. |
| GND | Ground Reference | System ground return path; must be low-impedance connection to minimize noise coupling into sensitive I²C lines. |
| SDA | Open-Drain Bidirectional Data Line | Carries I²C data and ACK/NACK; requires external pull-up resistor ≤10 kΩ - shared across multiple slaves in wire-OR configuration. |
| SCL | Input Clock Line | Controls data sampling timing; rising edge latches input, falling edge outputs data - must be pulled high externally or driven by master. |
| WP | Hardware Write-Protect Input | When high (≥0.7×VCC), disables all write operations to entire memory array - prevents accidental corruption during power transitions or firmware faults. |
| VCC | Power Supply Input | Supplies core logic and EEPROM array; slew rate ≤0.1 V/µs required for reliable POR behavior; stable ≥100 µs before first command. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed 128-bit Serial Number | Permanently written during wafer test; occupies separate memory space outside user array; guaranteed globally unique across all CS-series EEPROMs - enables plug-and-play device authentication without host-side key management. |
| 1 MHz Fast Mode Plus Support | Validated at 2.5V–5.5V; reduces full-memory write time to <1.3 seconds (vs >5 s at 100 kHz) - accelerates factory provisioning and field firmware recovery. |
| 32-byte Page Write with Partial Writes | Allows writing 1–32 bytes per transaction without erasing adjacent bytes - preserves valid configuration data during incremental updates. |
| Schmitt Triggers + Noise Filtering | Integrated on SDA/SCL inputs; suppresses transients ≤100 ns (Fast Mode) or ≤50 ns (FM+) - improves robustness in electrically noisy industrial environments (e.g., motor drives, PLCs). |
| Ultra-Low Standby Current (6 µA) | Measured at 5.0V and 25°C; enables >10-year battery life in coin-cell-powered IoT nodes using periodic wake-up + EEPROM read cycles. |
Applications
| Industrial Sensor Node | Medical Diagnostic Device |
|---|---|
|
Use Scenario: Storing calibrated sensor offsets, linearization coefficients, and manufacturing date in a wireless temperature/humidity node deployed in HVAC ducts. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with tamper-resistant identity; accessed during boot and after sensor recalibration events. Use Value: Eliminates need for external calibration EEPROM programming; 128-bit serial number enables cloud-based device lifecycle tracking without adding MCU flash overhead. |
Use Scenario: Holding FDA-mandated device serial number, calibration timestamp, and usage counter in a portable ultrasound probe. IC Role / Device Role / Timing Role: Secure, immutable identity anchor and audit-log storage; accessed only during power-on self-test and service mode. Use Value: Meets IEC 62304 traceability requirements; hardware WP pin prevents runtime overwrite of regulatory-critical fields during probe operation. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Recording tariff schedules, meter firmware version, and tamper-detection flags in a DIN-rail mounted electricity meter. IC Role / Device Role / Timing Role: High-reliability parameter store with 100-year data retention; updated infrequently but must survive 15+ year field life. Use Value: 1M write cycles ensure >100 years of daily firmware update logging; industrial temp range (–40°C to +85°C) matches outdoor enclosure requirements. |
Use Scenario: Storing seat position presets, mirror angle profiles, and vehicle-specific CAN node ID in a BCM controlling power seats and windows. IC Role / Device Role / Timing Role: User preference storage with guaranteed uniqueness across vehicle production batches. Use Value: Factory-programmed serial number replaces software-based UUID generation, reducing MCU boot time and flash wear from random-number seeding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C64D-MAHM-T | No factory-programmed serial number; identical 64-Kbit density, I²C interface, and UDFN-8 package; supports same VCC range and speed modes. | Lacks hardware-enforced device identity - requires host MCU to manage serialization or accept duplicate IDs in mass production. | Select when cost sensitivity outweighs traceability needs and host firmware can handle ID assignment. |
| M95640-DFMN6TP | 64-Kbit SPI interface (not I²C); operates 1.8V–5.5V; 5 ms max write cycle; no built-in serial number; SO8 package only. | Requires SPI-capable MCU GPIOs and different driver stack; incompatible with existing I²C bus infrastructure. | Choose only if system already uses SPI peripherals and board layout cannot accommodate I²C routing changes. |
Compared with AT24CS64-MAHM-E, AT24C64D-MAHM-T offers identical memory and interface functionality at lower cost but removes the critical 128-bit serialization capability, while M95640-DFMN6TP forces architecture-level redesign due to SPI-only communication and absence of hardware identity - making AT24CS64-MAHM-E the sole option for I²C-based, traceable, drop-in configuration storage.
Availability
AT24CS64-MAHM-E is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostic devices, smart energy meters, automotive body control modules, and IoT edge gateways requiring stable component supply, long-lifecycle assurance, and guaranteed device traceability.
Supply support for AT24CS64-MAHM-E 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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and broad automotive qualification coverage.
The AT24CS64-MAHM-E belongs to Microchip's CS-series serial EEPROM family, engineered specifically for applications demanding factory-assigned, cryptographically usable device identity alongside robust nonvolatile storage - targeting medical, industrial, and automotive markets where serialization and data integrity are regulatory requirements.
FAQ
What is the function of the WP pin on the AT24CS64-MAHM-E?
The WP (Write-Protect) pin on the AT24CS64-MAHM-E provides hardware-level inhibition of all write operations to the EEPROM array when driven high (≥0.7×VCC). When connected to GND or left floating (internally pulled down), normal read/write access is enabled. This feature prevents accidental or malicious overwrites during power-up transients, firmware crashes, or ESD events - a critical safeguard for calibration data and device identity stored in AT24CS64-MAHM-E.
Does the AT24CS64-MAHM-E require external pull-up resistors on SDA and SCL lines?
Yes, the AT24CS64-MAHM-E requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is a CMOS input. Microchip specifies maximum values of 10 kΩ for SDA and recommends ≤10 kΩ for SCL. Pull-up values depend on bus capacitance and target I²C speed: e.g., 4 kΩ for 400 kHz, 1.3 kΩ for 1 MHz FM+. These resistors ensure proper signal rise times and noise immunity - essential for reliable communication in systems using AT24CS64-MAHM-E.
How is the 128-bit serial number accessed in the AT24CS64-MAHM-E?
The 128-bit serial number in the AT24CS64-MAHM-E is accessed via a dedicated I²C address block using device type identifier '1011b' (0xB0–0xB7), distinct from the main 64-Kbit memory ('1010b'). It is read-only, factory-programmed, and physically isolated - consuming no user memory space. The AT24CS64-MAHM-E datasheet specifies exact byte offsets and read sequence (repeated START required). No write commands affect this region, ensuring persistent identity even after full-memory erase cycles.
What is the maximum write cycle time for the AT24CS64-MAHM-E?
The maximum write cycle time for the AT24CS64-MAHM-E is 5 ms per byte or page, as specified in the datasheet under AC Characteristics (tWR). This applies to both single-byte and 32-byte page writes. During this time, the device does not acknowledge new I²C commands - host firmware must implement acknowledge polling or fixed-delay waits before issuing subsequent operations. This timing is guaranteed across the full industrial temperature range (–40°C to +85°C) and 1.7V–5.5V VCC range for AT24CS64-MAHM-E.
Is the AT24CS64-MAHM-E compatible with standard I²C protocol implementations?
Yes, the AT24CS64-MAHM-E is fully compliant with standard I²C protocol specifications, supporting Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast Mode Plus (1 MHz). It implements correct START/STOP detection, ACK/NACK handshaking, 7-bit slave addressing with A0–A2 hardware inputs, and bidirectional data transfer synchronized to SCL edges. All timing parameters (tHIGH, tLOW, tSU.STA, etc.) meet I²C-bus specification limits - ensuring interoperability with any standard I²C master, including those in STM32, PIC, ESP32, and NXP microcontrollers using AT24CS64-MAHM-E.
AT24CS64-MAHM-E 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-E FAQ
1.How can I place an order for AT24CS64-MAHM-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS64-MAHM-E 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-E reliable?
The price and inventory of AT24CS64-MAHM-E 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-E is usually 5 days.
3.What payment methods are accepted for AT24CS64-MAHM-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS64-MAHM-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS64-MAHM-E?
AT24CS64-MAHM-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS64-MAHM-E 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-E?
For technical support, including AT24CS64-MAHM-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS64-MAHM-E requirements.
6.How does Aetrix verify that AT24CS64-MAHM-E is sourced from the original manufacturer or authorized distributors?
All AT24CS64-MAHM-E 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-E meets industry standards.
7.What is the process for return or replacement of AT24CS64-MAHM-E?
All AT24CS64-MAHM-E units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS64-MAHM-E, 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-E part is unused and in its original packaging.
Return procedure for AT24CS64-MAHM-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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