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Microchip Technology 48L512-I/SN
- Part No.:
- 48L512-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
48L512-I/SN.pdf
- Description:
- IC EERAM 512KBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,256
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Product details
Overview
48L512-I/SN from Microchip Technology is a 512-Kbit serial EERAM integrating a 65,536 × 8-bit SRAM core with cell-based EEPROM backup, SPI interface (up to 66 MHz), and automatic power-loss data retention. It operates at 2.7V–3.6V, supports Industrial temperature (−40°C to +85°C), and uses an external VCAP capacitor for seamless SRAM-to-EEPROM store/recall during brown-out events. Used in industrial controllers and metering systems requiring nonvolatile SRAM behavior without software intervention.
For engineers reviewing the 48L512-I/SN datasheet, 48L512-I/SN pinout, 48L512-I/SN application, or 48L512-I/SN equivalent, this page delivers verified electrical specs (66 MHz SPI, 3 μA hibernate current, 100K store cycles), package mapping (8-Lead SOIC), validated pin functions (CS/SO/VCAP/SI/SCK/HOLD/VSS/VCC), and two confirmed alternative parts with documented functional and application differences.
Technical Context
The 48L512-I/SN implements a dual-memory architecture where SRAM provides unlimited read/write access while embedded EEPROM mirrors each SRAM cell for nonvolatile backup. VCC monitoring triggers autonomous store/recall-no host firmware involvement required. The device uses SPI Modes 0 and 3, latching input on SCK rising edge and outputting on falling edge.
It includes a volatile STATUS register with WEL, RDY/BSY, BP[1:0], and ASE bits; a 16-byte nonvolatile user space; and hardware HOLD functionality that suspends ongoing transfers without resetting sequence state. All store operations-including AutoStore on VCC drop below 2.30–2.65 V-use internal charge from the VCAP capacitor (47–100 μF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (65,536 × 8-bit SRAM array) |
| SPI Clock Frequency | Up to 66 MHz - enables high-throughput data logging in real-time control loops |
| Operating Voltage | 2.7V–3.6V - compatible with standard 3.3V industrial logic rails |
| Hibernate Current | 3 μA at 85°C - allows battery-backed operation for >1 year on coin cell |
| AutoStore Threshold | VTRIP = 2.30–2.65 V - ensures reliable data capture before system brown-out completes |
| Data Retention | 100 years at 55°C - guarantees long-term firmware parameter storage in sealed enclosures |
| Endurance | 100,000 store cycles at 85°C - supports daily power-cycle logging in energy meters |
Pinout & Package
48L512-I/SN is housed in an 8-Lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch) with gull-wing leads, RoHS-compliant, and rated for Industrial temperature range (−40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: drives device into standby when high; forces SO to high-Z for bus sharing |
| SO | Serial Data Output | Tri-state output: data shifted MSb-first on falling SCK edge; enters high-Z immediately on HOLD low |
| VCAP | External Capacitor Terminal | Connects to 47–100 μF capacitor: supplies energy for SRAM→EEPROM transfer during VCC loss |
| VSS | Ground | Reference return path for all digital and analog circuitry; must be low-impedance |
| SI | Serial Data Input | Accepts opcodes, addresses, and data MSb-first on rising SCK edge; ignored during HOLD |
| SCK | Serial Clock Input | Master-generated clock: defines timing for SI sampling (rising edge) and SO update (falling edge) |
| HOLD | Hold Input | Pauses ongoing SPI transfer without aborting; requires SCK low to activate/deactivate |
| VCC | Supply Voltage | Primary power rail (2.7–3.6V); monitored internally to trigger AutoStore/AutoRecall |
Key Features
| Feature | Design Value |
|---|---|
| Cell-Based EEPROM Backup | Full SRAM array mirrored bit-for-bit; parallel store/recall eliminates per-cell latency |
| Invisible Power-Loss Handling | No host intervention needed: VCC monitoring + VCAP discharge automates data preservation |
| Symmetrical Read/Write Timing | No page boundaries or write delays: identical AC specs for reads and writes simplify timing design |
| Hardware HOLD Function | Preserves SPI state mid-transfer; resumes from exact bit position after HOLD deassertion |
| 16-Byte Nonvolatile User Space | Dedicated area for calibration constants or device IDs; written/verified in single atomic operation |
Applications
| Industrial PLC Data Logging | Smart Energy Metering |
|---|---|
Use Scenario: Capturing sensor readings and operational timestamps during mains power interruptions. IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer that retains last valid measurement set across brown-outs without firmware overhead. Use Value: Eliminates need for external backup batteries or supercapacitors while guaranteeing data integrity per IEC 62056 standards. | Use Scenario: Storing tariff schedules, billing counters, and tamper-event logs in DIN-rail mounted meters. IC Role / Device Role / Timing Role: High-reliability memory for critical billing parameters with 100-year retention at 55°C ambient. Use Value: Meets ANSI C12.22 and DLMS/COSEM requirements for secure, long-life data persistence in unattended deployments. |
| Medical Diagnostic Equipment | Automotive Body Control Modules |
Use Scenario: Preserving calibration coefficients and fault history during unexpected shutdowns in portable ultrasound units. IC Role / Device Role / Timing Role: Fail-safe memory for FDA-critical configuration data with deterministic recall under 200 μs. Use Value: Supports IEC 62304 Class B software safety requirements by removing software-initiated store dependencies. | Use Scenario: Maintaining window position, seat memory, and lighting profiles across ignition cycles in 12V automotive systems. IC Role / Device Role / Timing Role: Low-power (3 μA hibernate) nonvolatile storage interfaced directly to CAN microcontroller SPI peripheral. Use Value: Enables seamless user experience without external power management ICs or EEPROM wear-leveling firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EERAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 48LM01-I/SO | 1-Mbit capacity (131,072 × 8-bit), same SOIC-8 package, identical timing and VCAP requirements | Used where larger buffer size is needed for extended event logging or firmware patch storage | Select when >512 Kbit SRAM is required; pinout and command set fully compatible |
| FM25V05-G | F-RAM-based (not EERAM); 512 Kbit, 40 MHz SPI, no VCAP capacitor, 10¹⁴ endurance cycles | Preferred in high-write-frequency applications (e.g., real-time sensor streaming) where EEPROM wear-out is a concern | Choose for ultra-high endurance; trade-off is higher active current (8 mA vs. 5 mA) and no AutoStore hibernate mode |
Compared with 48L512-I/SN, 48LM01-I/SO offers double memory density in identical footprint and timing, while FM25V05-G replaces EEPROM backup with F-RAM for infinite write cycles but removes autonomous power-loss protection-requiring host-controlled store commands.
Availability
48L512-I/SN is available at Aetrix Electronics and suitable for industrial automation, smart metering, medical diagnostics, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for 48L512-I/SN 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory solutions for industrial, automotive, and communications markets.
The 48L512-I/SN belongs to Microchip's EERAM product line, designed specifically to replace battery-backed SRAM and discrete EEPROM+SRAM combinations in systems demanding zero-software, autonomous nonvolatile data retention during power failure.
FAQ
What is the primary function of the VCAP pin on the 48L512-I/SN?
The VCAP pin on the 48L512-I/SN connects to an external 47–100 μF capacitor that supplies energy during VCC loss, enabling autonomous SRAM-to-EEPROM store operations without host intervention. This capacitor is charged to VCC during normal operation and discharges through VCAP to power internal backup circuitry when VCC drops below 2.30–2.65 V, ensuring data integrity across brown-out events. The 48L512-I/SN will not perform AutoStore without a properly sized and rated capacitor on VCAP.
Does the 48L512-I/SN require software commands to retain data during power loss?
No, the 48L512-I/SN does not require software commands to retain data during power loss. Its AutoStore feature automatically transfers the entire SRAM contents to EEPROM when VCC falls below the trip voltage (2.30–2.65 V), using energy stored in the external VCAP capacitor. Similarly, AutoRecall restores data to SRAM on power-up. These operations are fully hardware-managed-no firmware interaction, polling, or command execution is needed for basic nonvolatile behavior in the 48L512-I/SN.
What SPI modes does the 48L512-I/SN support, and how do they affect timing?
The 48L512-I/SN supports SPI Modes 0 and 3 only. In both modes, data is latched on the rising edge of SCK and output on the falling edge. The difference lies in SCK idle polarity: Mode 0 uses low-idle SCK, while Mode 3 uses high-idle SCK. The 48L512-I/SN requires consistent idle polarity before and after CS assertion-mismatched idle states will cause communication failure. AC timing parameters (e.g., TCSS = 6 ns, TV = 10 ns) apply identically across both supported modes.
Can the 48L512-I/SN be used as a direct replacement for standard SPI SRAMs?
Yes, the 48L512-I/SN is functionally compatible with standard SPI SRAMs in read/write operations-same opcodes (02h/03h), address format, and timing-but adds invisible nonvolatile backup. No changes to existing SRAM driver code are needed for basic operation. However, to leverage AutoStore, ensure proper VCAP capacitor placement and verify VCC ramp rates meet TVRISE/TvFALL specs (≥30 μs/V). Unlike pure SRAMs, the 48L512-I/SN also exposes STATUS register bits (WEL, RDY/BSY) and STORE/RECALL commands for advanced control.
What is the endurance rating of the EEPROM backup in the 48L512-I/SN?
The EEPROM backup in the 48L512-I/SN is rated for a minimum of 100,000 store cycles at 85°C, as specified in DS20006008C-page 5, Table 1-2, parameter #25. Each store cycle transfers the full 65,536 × 8-bit SRAM array to EEPROM in parallel. This endurance applies to both AutoStore (triggered by VCC drop) and Software Store (initiated via 08h opcode). Retention remains 100 years at 55°C even after maximum endurance cycles, per same datasheet section.
48L512-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EERAM
- Technology:
- EEPROM, SRAM
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 66 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
48L512-I/SN FAQ
1.How can I place an order for 48L512-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 48L512-I/SN 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 48L512-I/SN reliable?
The price and inventory of 48L512-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 48L512-I/SN is usually 5 days.
3.What payment methods are accepted for 48L512-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 48L512-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 48L512-I/SN?
48L512-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 48L512-I/SN 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 48L512-I/SN?
For technical support, including 48L512-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 48L512-I/SN requirements.
6.How does Aetrix verify that 48L512-I/SN is sourced from the original manufacturer or authorized distributors?
All 48L512-I/SN 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 48L512-I/SN meets industry standards.
7.What is the process for return or replacement of 48L512-I/SN?
All 48L512-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 48L512-I/SN, 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 48L512-I/SN part is unused and in its original packaging.
Return procedure for 48L512-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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