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Renesas R1EX24064ASAS0I#U0
- Part No.:
- R1EX24064ASAS0I#U0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
R1EX24064ASAS0I#U0.pdf
- Description:
- IC EEPROM 64KBIT I2C 400KHZ 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
R1EX24064ASAS0I from Renesas Electronics is a 64 kbit (8,192 × 8-bit) two-wire serial EEPROM with I²C interface, 400 kHz clock support, 1.8–5.5 V single-supply operation, and 32-byte page write capability-used for nonvolatile parameter storage in embedded control modules, industrial sensors, and power management units.
For engineers reviewing the R1EX24064ASAS0I datasheet, R1EX24064ASAS0I pinout, R1EX24064ASAS0I application, or R1EX24064ASAS0I equivalent, key selection considerations include its SOP-8 package, −40°C to +85°C industrial temperature range, WP pin-based hardware write protection, 5 ms write cycle time, and MONOS memory technology enabling 1,000k endurance cycles and 100-year data retention at 25°C.
Technical Context
This device implements a standard I²C-compatible two-wire serial interface with fixed 1010 device code, supporting up to eight devices on one bus via A0–A2 address pins. It uses MONOS (Metal-Oxide-Nitride-Oxide-Silicon) charge-trap memory cells fabricated in advanced CMOS process, delivering low-power operation and high reliability without external high-voltage programming circuitry.
The internal architecture includes a serial-parallel converter, voltage detector, high-voltage generator for write/erase, and address/data latches synchronized to SCL edges. Write operations are internally timed (tWC = 5 ms max), with acknowledge polling supported to detect write completion; WP pin enables full-array hardware write protection when driven high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 64 kbit (8,192 × 8-bit) - supports firmware configuration tables, calibration data, and event logs in space-constrained designs. |
| Interface | I²C two-wire serial (SCL/SDA) - simplifies PCB routing with only two signal lines and standard protocol stack compatibility. |
| Max clock frequency | 400 kHz - enables ~32 kbit/s effective write throughput with page writes, suitable for infrequent but deterministic updates. |
| Supply voltage | 1.8 V to 5.5 V - interoperable with 1.8 V, 3.3 V, and 5 V microcontrollers without level-shifting. |
| Write endurance | 1,000,000 cycles @ 25°C - sufficient for daily parameter logging over 27 years before wear-out. |
| Data retention | 100 years @ 25°C - ensures long-term validity of stored calibration coefficients or security keys across product lifetime. |
| Standby current | 2.0 μA max @ 5.5 V - minimizes battery drain in always-on IoT edge nodes and portable instrumentation. |
| Page size | 32 bytes - reduces I²C transaction overhead by up to 31× vs. byte-write mode for bulk configuration writes. |
Pinout & Package
Package: 150-mil 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), lead-free and halogen-free (#U0 suffix), 2.5 mm × 4.89 mm body, 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device address inputs | Hard-wired to VSS or VCC to select one of eight possible I²C addresses (1010xxxR/W); internally pulled down-safe if left unconnected. |
| VSS | Ground reference | Primary return path for all internal logic and memory array currents; must be low-impedance and decoupled near device. |
| VCC | Power supply | Single 1.8–5.5 V rail powering logic, memory, and I/O; requires 0.1 μF ceramic bypass capacitor between VCC and VSS. |
| WP | Hardware write protect | Active-high input disabling all write operations when ≥0.7×VCC; internally pulled down-write enabled by default if unconnected. |
| SCL | Serial clock input | Open-drain compatible; controls timing of data sampling (rising edge) and output (falling edge); max 400 kHz frequency. |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up; carries device address, memory address, and data with ACK/NACK signaling. |
Key Features
| Feature | Design Value |
|---|---|
| MONOS memory technology | Enables 1.8 V operation and eliminates need for external charge pump, reducing system BOM and layout complexity. |
| 32-byte page write | Reduces I²C bus occupancy by consolidating up to 32 sequential byte writes into one stop-initiated transaction. |
| Write protect (WP) pin | Provides hardware-level immunity against accidental writes during power transitions or firmware faults-no software dependency. |
| Power-on reset (POR) circuit | Prevents spurious writes during VCC ramp-up/down by blocking SCL/SDA activity until stable supply is detected. |
| Noise suppression (50 ns) | Filters transient noise on SCL/SDA lines, improving robustness in electrically noisy industrial environments. |
| Lead-free & halogen-free (#U0) | Meets RoHS Directive 2011/65/EU and JEDEC JS709C requirements for environmentally compliant manufacturing. |
Applications
| Industrial Sensor Calibration | Smart Meter Firmware Storage |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in pressure, flow, or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent parameters read at power-up and updated only during recalibration. Use Value: Eliminates need for external trimming components and enables field recalibration without hardware modification-supported by 100-year data retention and 1M-cycle endurance. |
Use Scenario: Retaining tariff schedules, metering history, and cryptographic keys in residential/utility smart electricity meters operating for >15 years. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter vault accessed via I²C during boot and firmware update sequences. Use Value: WP pin prevents unauthorized firmware rewrites; 1.8 V min operation ensures compatibility with low-power metrology SoCs during brownout conditions. |
| Embedded Power Supply Sequencing | IoT Edge Node Configuration |
|
Use Scenario: Holding startup delay values, voltage thresholds, and enable/disable states for multi-rail DC/DC converters in telecom base station PSUs. IC Role / Device Role / Timing Role: System-level configuration manager storing sequencing logic parameters used by PMIC or FPGA controller. Use Value: 32-byte page writes allow atomic updates of entire sequencing table; 2.0 μA standby current extends hold-up time during AC loss events. |
Use Scenario: Saving Wi-Fi credentials, OTA update flags, and sensor sampling intervals in battery-powered environmental monitors deployed in remote locations. IC Role / Device Role / Timing Role: Low-energy persistent state keeper retaining operational context across sleep/wake cycles and cold resets. Use Value: 1.8 V operation enables direct interfacing with ultra-low-power MCUs; halogen-free construction meets stringent eco-design standards for consumer IoT. |
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 (Microchip) | Same 64 kbit I²C EEPROM, 400 kHz, SOP-8, but uses floating-gate flash; 1M endurance, 100-year retention, 1.7–5.5 V. | Identical functional scope; differs in memory cell physics (flash vs. MONOS) and slightly tighter VCC min (1.7 V). | Select AT24C64D-SSHM-T if sourcing flexibility across multiple qualified suppliers is prioritized and MONOS-specific radiation tolerance is not required. |
| M95640-DRMN6TP/K (STMicroelectronics) | 64 kbit SPI EEPROM (not I²C); 20 MHz SPI interface, same SOP-8, 1.8–5.5 V, 1M endurance, 40-year retention. | Requires SPI host interface instead of I²C; lacks WP pin-relies on software write protection or status register lock. | Choose M95640-DRMN6TP/K only if existing design already uses SPI peripherals and I²C bus loading is a constraint. |
Compared with AT24C64D-SSHM-T, R1EX24064ASAS0I offers MONOS-based immunity to write disturbance under high-temperature bias stress; versus M95640-DRMN6TP/K, it provides native I²C compatibility and hardware WP-critical for fail-safe industrial control systems.
Availability
R1EX24064ASAS0I is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, and embedded power supply sequencing requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for R1EX24064ASAS0I 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
Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and enterprise applications.
R1EX24064ASAS0I belongs to the R1EX24xxx family of I²C EEPROMs designed specifically for high-reliability, low-voltage embedded systems where long-term data integrity and minimal power consumption are critical.
FAQ
What is the maximum I²C clock frequency supported by the R1EX24064ASAS0I?
The R1EX24064ASAS0I supports a maximum I²C clock frequency of 400 kHz, as specified in its AC characteristics table. This allows reliable communication with standard-mode I²C controllers while maintaining noise immunity and timing margins across the full −40°C to +85°C operating range. The device does not support fast-mode (1 MHz) or higher speeds.
Does the R1EX24064ASAS0I require an external pull-up resistor on the SDA line?
Yes, the R1EX24064ASAS0I requires an external pull-up resistor on the SDA line because its SDA pin uses an open-drain output structure. A typical value is 4.7 kΩ for 3.3 V systems, selected based on bus capacitance, VOL specification (≤0.4 V at 3.0 mA), and rise time constraints (≤300 ns). SCL also requires a pull-up for the same reason.
How does the WP pin function on the R1EX24064ASAS0I?
The WP (Write Protect) pin on the R1EX24064ASAS0I is an active-high hardware lock: when driven to VIH (≥0.7×VCC), it disables all write operations-including byte, page, and erase-to the entire 64 kbit memory array. When WP is low or floating (internally pulled down), full read/write access is enabled. This provides fail-safe protection independent of firmware state.
What is the write cycle time for the R1EX24064ASAS0I, and how is it managed?
The R1EX24064ASAS0I has a maximum write cycle time (tWC) of 5 ms, which is internally controlled after a STOP condition. During this period, the device ignores further I²C commands. Engineers must use acknowledge polling-repeatedly sending the device address with R/W=0-to detect completion, as no external busy signal is provided.
Is the R1EX24064ASAS0I compatible with 1.8 V microcontrollers?
Yes, the R1EX24064ASAS0I operates across 1.8 V to 5.5 V, making it fully compatible with 1.8 V microcontrollers. Its VIH threshold is defined as 0.7×VCC (min 1.26 V at 1.8 V), and VOL remains ≤0.2 V at 1.5 mA, ensuring robust logic-level interoperability without level shifters in mixed-voltage systems.
R1EX24064ASAS0I#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- 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:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
R1EX24064ASAS0I#U0 FAQ
1.How can I place an order for R1EX24064ASAS0I#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1EX24064ASAS0I#U0 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 R1EX24064ASAS0I#U0 reliable?
The price and inventory of R1EX24064ASAS0I#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1EX24064ASAS0I#U0 is usually 5 days.
3.What payment methods are accepted for R1EX24064ASAS0I#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1EX24064ASAS0I#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1EX24064ASAS0I#U0?
R1EX24064ASAS0I#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1EX24064ASAS0I#U0 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 R1EX24064ASAS0I#U0?
For technical support, including R1EX24064ASAS0I#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1EX24064ASAS0I#U0 requirements.
6.How does Aetrix verify that R1EX24064ASAS0I#U0 is sourced from the original manufacturer or authorized distributors?
All R1EX24064ASAS0I#U0 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 R1EX24064ASAS0I#U0 meets industry standards.
7.What is the process for return or replacement of R1EX24064ASAS0I#U0?
All R1EX24064ASAS0I#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R1EX24064ASAS0I#U0, 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 R1EX24064ASAS0I#U0 part is unused and in its original packaging.
Return procedure for R1EX24064ASAS0I#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1EX24064ASAS0I#U0 Tags
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