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Microchip Technology AT24CS64-SSHM-T
- Part No.:
- AT24CS64-SSHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24CS64-SSHM-T.pdf
- Description:
- IC EEPROM 64KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:16,571
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Product details
Overview
AT24CS64-SSHM-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, 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 controllers, sensor nodes, and IoT edge devices requiring traceable device identity.
For engineers reviewing the AT24CS64-SSHM-T datasheet, AT24CS64-SSHM-T pinout, AT24CS64-SSHM-T application, or AT24CS64-SSHM-T equivalent, key selection criteria include its guaranteed unique serial number across the CS Series, ultra-low standby current (6 µA max), 1,000,000 write endurance, and compatibility with multi-device I²C bus topologies using A0/A1/A2 address inputs.
Technical Context
The AT24CS64-SSHM-T 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 depending on VCC level. 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 locked during wafer fabrication. The WP pin provides hardware-level full-array write inhibition when driven high, while internal weak pull-downs on A0/A1/A2 ensure deterministic addressing if pins are left unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 64 Kbit (8,192 × 8), organized as 256 pages of 32 bytes each - enables efficient firmware parameter storage with page-aligned updates. |
| Interface | I²C-compatible two-wire bus - supports standard, fast, and fast mode plus protocols up to 1 MHz at VCC ≥ 2.5V - simplifies integration with microcontrollers lacking SPI peripherals. |
| Supply voltage | 1.7V to 5.5V - allows direct interfacing with 1.8V, 3.3V, and 5V logic domains without level shifters. |
| Write endurance | 1,000,000 cycles - ensures reliable logging or calibration data retention over 10+ years in field-deployed industrial sensors. |
| Data retention | 100 years at 55°C - guarantees long-term integrity of device identity and configuration data without refresh. |
| Standby current | 6 µA maximum at 5.0V - minimizes battery drain in always-on IoT endpoints and portable medical devices. |
| Serial number | 128-bit factory-programmed, permanent, and globally unique across all CS Series EEPROMs - eliminates need for external serialization infrastructure in manufacturing. |
Pinout & Package
AT24CS64-SSHM-T is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm), with gull-wing leads and RoHS-compliant lead-free finish. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware device address input | Configures LSB of 3-bit slave address; pulled down internally if floating - enables up to eight devices on one I²C bus. |
| A1 | Hardware device address input | Configures middle bit of 3-bit slave address; internal pull-down ensures default '0' state - supports flexible bus topology without external resistors. |
| A2 | Hardware device address input | Configures MSB of 3-bit slave address; bias above ~0.5×VCC disables internal pull-down - allows deterministic addressing in noisy environments. |
| GND | Power ground reference | System return path for VCC and I/O; must be low-impedance connection to minimize noise coupling into SDA/SCL lines. |
| SDA | Open-drain bidirectional data line | Transfers command/data/ACK/NACK; requires external pull-up resistor ≤10 kΩ - supports wired-AND bus sharing with other I²C slaves. |
| SCL | Input clock line | Controls data sampling timing; rising edge latches input, falling edge outputs data - must be pulled high externally or driven actively by master. |
| WP | Hardware write-protect enable | Drives high to inhibit all writes to entire memory array; internal pull-down defaults to write-enable - prevents accidental corruption during power transients. |
| VCC | Power supply input | Supplies core logic and EEPROM programming voltage; slew rate limited to ≤0.1 V/µs for reliable POR behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently programmed and locked during wafer test - removes serialization step from production line and ensures cryptographic uniqueness across Microchip's CS Series. |
| Multi-speed I²C support | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), and 1 MHz (2.5–5.5V) operation - enables optimal throughput scaling based on host controller capability and supply voltage. |
| Noise-immune interface | Schmitt-trigger inputs with integrated spike suppression filters - maintains reliable communication in electrically noisy industrial enclosures without external RC filtering. |
| Low-power standby mode | 6 µA max standby current at 5.0V - extends battery life in energy-constrained wireless sensor nodes and portable diagnostic tools. |
| Page write architecture | 32-byte page buffer with partial-write capability - reduces write time per byte and avoids unnecessary erase cycles when updating small configuration fields. |
Applications
| Secure Device Authentication | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Embedded systems requiring tamper-resistant device identity for secure boot or firmware validation. IC Role / Device Role / Timing Role: Nonvolatile storage of cryptographic keys and immutable hardware serial number used during authentication handshake. Use Value: The factory-programmed 128-bit serial number provides cryptographically verifiable uniqueness without software-based randomization or external provisioning. | Use Scenario: Factory-calibrated pressure, temperature, or flow sensors deployed in harsh industrial environments. IC Role / Device Role / Timing Role: Persistent storage of sensor-specific offset/gain coefficients and linearization tables updated once during calibration. Use Value: 100-year data retention and 1M write cycles ensure calibration data remains intact across product lifetime without periodic refresh. |
| IoT Edge Node Configuration | Medical Device Parameter Archiving |
Use Scenario: Battery-powered environmental monitors collecting air quality or occupancy data at remote sites. IC Role / Device Role / Timing Role: Storing network credentials, sampling intervals, and firmware update flags between wake cycles. Use Value: Ultra-low 6 µA standby current minimizes quiescent drain, extending operational life on coin-cell batteries beyond 5 years. | Use Scenario: Portable ultrasound or ECG devices requiring regulatory-compliant storage of usage logs and calibration history. IC Role / Device Role / Timing Role: Audit-trail memory for FDA 21 CFR Part 11 compliance, recording timestamps and operator IDs for critical settings changes. Use Value: Hardware write-protection (WP pin) prevents unauthorized modification of archived records during clinical use. |
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 | Lacks factory-programmed serial number; identical 64-Kbit density, SOIC-8 package, and I²C timing - no hardware differentiation capability. | Suitable only where device identity is managed externally (e.g., MCU flash or cloud database). | Select when serial number functionality is unnecessary and cost sensitivity outweighs traceability requirements. |
| M95640-DFMN6TP | SPI interface instead of I²C; same 64-Kbit capacity and 1.7–5.5V operation; no built-in serial number - requires different host peripheral and PCB routing. | Preferred in designs already using SPI peripherals and requiring higher burst read throughput than I²C supports. | Choose only if host MCU lacks I²C or system architecture mandates SPI-based memory expansion. |
Compared with AT24C64D-SSHM-T, the AT24CS64-SSHM-T adds irreplaceable device identity assurance; versus M95640-DFMN6TP, it trades interface flexibility for simplified two-wire bus integration and guaranteed serialization - making it optimal for I²C-based, identity-critical embedded systems.
Availability
AT24CS64-SSHM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostics equipment, and secure IoT gateways requiring stable component supply, long-lifecycle support, and guaranteed traceability through factory-serialized memory.
Supply support for AT24CS64-SSHM-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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.
The AT24CS64 belongs to Microchip's CS Series of serial EEPROMs, engineered specifically to eliminate manufacturing-line 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-SSHM-T?
The WP (Write-Protect) pin on the AT24CS64-SSHM-T provides hardware-level inhibition of all write operations to the entire memory array when driven high (to VCC). When connected to GND or left floating (due to internal pull-down), normal read and write functions operate. This feature prevents accidental or malicious overwrites during power-up transients or firmware errors, ensuring data integrity in safety-critical applications like medical devices and industrial controllers. The AT24CS64-SSHM-T's WP pin behavior is explicitly defined in Microchip's DS20006296A datasheet Section 2.5.
Does the AT24CS64-SSHM-T support 1 MHz I²C communication across its full voltage range?
No, the AT24CS64-SSHM-T supports 1 MHz Fast Mode Plus (FM+) operation only when VCC is between 2.5V and 5.5V. At VCC levels from 1.7V to 2.5V, maximum supported speed is 400 kHz (Fast Mode). This voltage-dependent timing is specified in Table 4-3 of the official datasheet and reflects internal driver strength limitations at lower voltages. Designers must configure their I²C master accordingly - the AT24CS64-SSHM-T does not auto-negotiate speed modes.
How is the 128-bit serial number accessed on the AT24CS64-SSHM-T?
The 128-bit serial number on the AT24CS64-SSHM-T is accessed via a separate I²C device address using the type identifier '1011b' (0xB0–0xB7) instead of the standard '1010b' (0xA0–0xA7) used for user memory. It resides in a dedicated, read-only memory block physically isolated from the 64-Kbit EEPROM array and cannot be modified after factory programming. The AT24CS64-SSHM-T datasheet Section 6.1 and Figure 6-1 detail the exact addressing sequence and byte layout required to read this value.
What is the maximum write cycle time for the AT24CS64-SSHM-T?
The maximum self-timed write cycle time for the AT24CS64-SSHM-T is 5 ms, as confirmed in Section 7.4 and Table 4-3 of the Microchip datasheet. This applies to both byte and page write operations and represents the worst-case duration before the device releases the SDA line and responds to subsequent commands. During this period, the host must perform acknowledge polling or wait - the AT24CS64-SSHM-T does not support ready/busy signaling via external pins.
Is the AT24CS64-SSHM-T compatible with standard I²C protocol analyzers and development tools?
Yes, the AT24CS64-SSHM-T is fully compliant with the standardized I²C specification (NXP UM10204) for Standard, Fast, and Fast Mode Plus modes, including start/stop conditions, ACK/NACK handshaking, and 7-bit slave addressing with R/W bit. It has been validated with common protocol analyzers (e.g., Total Phase Beagle I²C) and development platforms (e.g., Arduino Wire library, STM32 HAL_I2C). All timing parameters in the AT24CS64-SSHM-T datasheet align with I²C bus requirements, ensuring interoperability without custom driver modifications.
AT24CS64-SSHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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-SOIC
AT24CS64-SSHM-T FAQ
1.How can I place an order for AT24CS64-SSHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS64-SSHM-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-SSHM-T reliable?
The price and inventory of AT24CS64-SSHM-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-SSHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS64-SSHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS64-SSHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS64-SSHM-T?
AT24CS64-SSHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS64-SSHM-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-SSHM-T?
For technical support, including AT24CS64-SSHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS64-SSHM-T requirements.
6.How does Aetrix verify that AT24CS64-SSHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS64-SSHM-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-SSHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS64-SSHM-T?
All AT24CS64-SSHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS64-SSHM-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-SSHM-T part is unused and in its original packaging.
Return procedure for AT24CS64-SSHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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