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Microchip Technology AT24C64D-UUM-T
- Part No.:
- AT24C64D-UUM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 6-XFBGA, WLCSP
- Datasheet:
-
AT24C64D-UUM-T.pdf
- Description:
- IC EEPROM 64KBIT I2C 1MHZ 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,902
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Product details
Overview
AT24C64D-UUM-T from Microchip Technology is a 64-Kbit I²C-compatible serial EEPROM organized as 8,192 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support (2.5V–5.5V), and hardware write-protection via WP pin-used for firmware storage, calibration data retention, and configuration memory in embedded controllers.
For engineers reviewing the AT24C64D-UUM-T datasheet, AT24C64D-UUM-T pinout, AT24C64D-UUM-T application, or AT24C64D-UUM-T equivalent, key selection criteria include VCC voltage range compatibility, I²C bus speed mode support (Standard/Fast/Fast Mode Plus), page write capability (32-byte), endurance (1M cycles), and package-specific pin mapping for UDFN-8.
Technical Context
The AT24C64D-UUM-T implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain bidirectional data transfer. It supports standard (100 kHz), fast (400 kHz), and fast mode plus (1 MHz) clock rates with distinct VCC requirements per mode.
Internally organized as 256 pages of 32 bytes, it uses A0–A2 hardware address pins to enable up to eight devices on one bus, and includes an internal power-on reset (POR) circuit with 100 µs tPUP delay and 1.5 V VPOR threshold to prevent spurious writes during power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8), enabling storage of boot parameters, device IDs, or sensor calibration tables in space-constrained designs. |
| 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 (1.7–5.5V), 400 kHz (1.7–5.5V), 1 MHz (2.5–5.5V) - allows flexible timing margin selection based on bus capacitance and noise environment. |
| Write Endurance | 1,000,000 cycles - ensures reliable field updates for firmware patching or logging applications over product lifetime. |
| Data Retention | 100 years at 55°C - guarantees long-term integrity of stored configuration or calibration data in industrial deployments. |
| Active/Standby Current | Max 3 mA active (5V, 400 kHz write), max 6 µA standby (5V) - minimizes power impact in battery-backed or energy-harvesting systems. |
| Page Write Size | 32-byte page - enables efficient bulk writes while avoiding cross-page boundary errors during partial updates. |
Pinout & Package
AT24C64D-UUM-T is supplied in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads for automated optical inspection. The exposed pad is internally connected to GND and must be soldered to PCB ground for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired to GND or VCC to set LSB of 7-bit I²C slave address (1010A2A1A0); enables multi-device bus addressing. |
| A1 | Device Address Input | Second bit of hardware address; combined with A0/A2, selects one of eight possible addresses (1010000 to 1010111). |
| A2 | Device Address Input | MSB of hardware address; floating state defaults to GND via internal strong pull-down (~0.5×VCC trip point). |
| GND | Ground Reference | System return path for VCC and signal references; must be low-impedance connection to PCB ground plane. |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up (≤10 kΩ); transmits/receives I²C data with ACK/NACK protocol. |
| SCL | Serial Clock Input | Input-only clock line; rising edge latches input data, falling edge outputs data; requires external pull-up resistor. |
| WP | Write-Protect Control | Logic high (VCC) disables all writes to entire memory array; floating defaults to GND (write enabled) but recommended tied explicitly. |
| VCC | Power Supply | 1.7–5.5V supply; slew rate ≤0.1 V/µs required; must stabilize ≥100 µs before first I²C command after power-up. |
Key Features
| Feature | Design Value |
|---|---|
| Fast Mode Plus Support | 1 MHz I²C operation at 2.5–5.5V enables faster configuration loading vs. legacy 400 kHz devices, reducing boot time in real-time systems. |
| Schmitt Trigger Inputs | Integrated noise filtering on SDA/SCL eliminates false triggering from EMI or slow-rising signals in noisy industrial environments. |
| Hardware Write Protection | WP pin provides unconditional, non-volatile lockout of memory writes-critical for safeguarding bootloader or security keys against accidental overwrite. |
| Low-Voltage Operation | Full functionality down to 1.7V allows direct integration with ultra-low-power MCUs (e.g., ARM Cortex-M0+) without voltage translation. |
| Green Packaging | UDFN-8 package is RoHS-compliant, halide-free, and lead-free-meets global environmental compliance requirements for industrial and consumer products. |
Applications
| Industrial Sensor Calibration | Embedded Bootloader Storage |
|---|---|
Use Scenario: Storing factory-calibrated coefficients and temperature compensation tables for pressure or humidity sensors deployed in HVAC or process control systems. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during sensor initialization; retains data across power cycles and withstands repeated field recalibration. Use Value: Eliminates need for external calibration hardware; enables plug-and-play sensor replacement with pre-loaded accuracy data. | Use Scenario: Holding secure boot images, public keys, and firmware signature verification data in microcontroller-based edge gateways. IC Role / Device Role / Timing Role: Trusted configuration store accessed early in boot sequence; protected by WP pin to prevent tampering during field updates. Use Value: Ensures cryptographic integrity of boot process without relying on internal flash security features that may be compromised. |
| Smart Meter Parameter Storage | Medical Device Configuration |
Use Scenario: Recording tariff schedules, billing history, and utility communication settings in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Tamper-resistant parameter memory with 100-year data retention; accessed via I²C during meter wake-up or firmware upgrade. Use Value: Meets ANSI/IEEE longevity requirements for revenue-grade metering; survives 1M+ write cycles during daily usage logging. | Use Scenario: Saving user-adjustable therapy parameters (e.g., infusion rate, alarm thresholds) and device serialization data in portable insulin pumps or ventilators. IC Role / Device Role / Timing Role: FDA-regulated persistent storage with guaranteed 100-year retention and write-cycle endurance for critical safety-critical settings. Use Value: Supports full traceability and audit compliance; enables zero-latency recall of last-safe configuration after power loss. |
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 | Same die, SOIC-8 package (5.0 mm × 4.4 mm); higher profile and larger footprint than UDFN-8. | Preferred for through-hole prototyping or legacy board layouts where UDFN rework is impractical. | Select when mechanical compatibility with existing SOIC footprints or hand-soldering is required. |
| M24C64-WMN6TP | STMicroelectronics part; identical 64-Kbit capacity and I²C interface, but supports only up to 400 kHz (no FM+), and has 1.7–5.5V VCC range. | Suitable for cost-sensitive designs where 1 MHz speed is unnecessary and ST's qualification ecosystem is preferred. | Choose when FM+ is not needed and dual-sourcing from ST is mandated for supply chain resilience. |
Compared with AT24C64D-UUM-T, the SOIC-packaged AT24C64D-SSHM-T offers identical electrical behavior but requires PCB layout changes, while M24C64-WMN6TP lacks Fast Mode Plus support and delivers lower maximum throughput-making AT24C64D-UUM-T optimal for compact, high-speed, or mixed-voltage I²C systems.
Availability
AT24C64D-UUM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded bootloader storage, and smart meter parameter storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT24C64D-UUM-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 AT24C64D belongs to Microchip's industry-standard I²C EEPROM product line, designed specifically for reliable, low-power, pin-compatible nonvolatile storage in resource-constrained embedded systems across industrial, automotive, and medical markets.
FAQ
What is the maximum I²C clock frequency supported by AT24C64D-UUM-T?
The AT24C64D-UUM-T supports 100 kHz (Standard Mode), 400 kHz (Fast Mode), and 1 MHz (Fast Mode Plus). Fast Mode Plus requires VCC ≥2.5V. All modes operate across the full 1.7–5.5V supply range except FM+, which is limited to 2.5–5.5V. This allows designers to select speed based on bus capacitance and noise immunity needs without changing the AT24C64D-UUM-T part number.
Does AT24C64D-UUM-T require external pull-up resistors on SDA and SCL lines?
Yes, AT24C64D-UUM-T requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is an input-only pin. Microchip specifies maximum values of 10 kΩ for SDA and recommends ≤10 kΩ for SCL. Pull-up values must be selected based on bus capacitance and desired rise time-e.g., 4.7 kΩ for 400 kHz operation with typical 200 pF bus load-to ensure compliance with AC timing specs in the AT24C64D-UUM-T datasheet.
How does the WP pin function on AT24C64D-UUM-T?
The WP (Write-Protect) pin on AT24C64D-UUM-T provides hardware-level protection: when pulled to VCC, it inhibits all write operations to the entire memory array; when grounded, normal writes are permitted. If left floating, the internal strong pull-down biases WP to GND (enabling writes), but Microchip recommends explicit connection to avoid noise-induced glitches. This feature ensures AT24C64D-UUM-T remains immune to accidental firmware corruption during system debug or power transients.
What is the memory organization of AT24C64D-UUM-T?
The AT24C64D-UUM-T organizes its 64 Kbit capacity as 8,192 words of 8 bits each, grouped into 256 pages of 32 bytes. This structure enables efficient page writes-up to 32 bytes per write cycle-with automatic wraparound within the page boundary. The 13-bit internal address counter increments on each read, supporting sequential access without retransmitting the address-critical for streaming calibration data or logging buffers in the AT24C64D-UUM-T.
Is AT24C64D-UUM-T compatible with other AT24Cxx devices on the same I²C bus?
Yes, AT24C64D-UUM-T is fully compatible with other AT24Cxx family members (e.g., AT24C02, AT24C16) on the same I²C bus due to shared 7-bit base address (1010b) and identical protocol implementation. Up to eight AT24C64D-UUM-T devices can coexist using unique A0–A2 combinations, and mixed-family operation is supported as long as address bits do not conflict. This interoperability simplifies design reuse and enables scalable memory expansion without modifying host driver code for the AT24C64D-UUM-T.
AT24C64D-UUM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 6-XFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 6-WLCSP
AT24C64D-UUM-T FAQ
1.How can I place an order for AT24C64D-UUM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C64D-UUM-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 AT24C64D-UUM-T reliable?
The price and inventory of AT24C64D-UUM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C64D-UUM-T is usually 5 days.
3.What payment methods are accepted for AT24C64D-UUM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C64D-UUM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C64D-UUM-T?
AT24C64D-UUM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C64D-UUM-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 AT24C64D-UUM-T?
For technical support, including AT24C64D-UUM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C64D-UUM-T requirements.
6.How does Aetrix verify that AT24C64D-UUM-T is sourced from the original manufacturer or authorized distributors?
All AT24C64D-UUM-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 AT24C64D-UUM-T meets industry standards.
7.What is the process for return or replacement of AT24C64D-UUM-T?
All AT24C64D-UUM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C64D-UUM-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 AT24C64D-UUM-T part is unused and in its original packaging.
Return procedure for AT24C64D-UUM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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