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Microchip Technology 48LM01-I/SM
- Part No.:
- 48LM01-I/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
48LM01-I/SM.pdf
- Description:
- IC EERAM 1MBIT SPI 66MHZ 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,490
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Product details
Overview
48LM01-I/SM from Microchip Technology is a 1-Mbit (131,072 × 8) SPI serial EERAM integrating a full SRAM array with cell-based EEPROM backup. It delivers symmetrical read/write timing up to 66 MHz, supports SPI Modes 0 and 3, and operates across -40°C to +85°C at 2.7V–3.6V. Used in industrial data logging systems where persistent memory without software intervention is required.
For engineers reviewing the 48LM01-I/SM datasheet, 48LM01-I/SM pinout, 48LM01-I/SM application, or 48LM01-I/SM equivalent, this page provides verified electrical specs, VCAP capacitor requirements, AutoStore/AutoRecall behavior, STATUS register bit mapping, and real-world use cases for fail-safe SRAM retention in brown-out-prone environments.
Technical Context
The 48LM01-I/SM implements a dual-memory architecture: a volatile 131,072 × 8-bit SRAM core paired with a hidden, cell-mirrored EEPROM array. All SRAM-to-EEPROM transfers occur automatically on VCC drop below 2.30–2.65 V (D13), using energy stored in the external VCAP capacitor (47–100 μF).
It uses standard SPI protocol with Schmitt-trigger inputs, supports HOLD for mid-sequence pause, and includes a writable 8-bit STATUS register with BP[1:0] block protection, ASE auto-store enable, and RDY/BSY status flag. The device requires no user-initiated backup commands for power-loss recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 131,072 × 8-bit SRAM with parallel cell-for-cell EEPROM backup |
| SPI Clock Speed | Up to 66 MHz - enables high-throughput data buffering in real-time control loops |
| AutoStore Threshold | 2.30–2.65 V (VTRIP) - triggers seamless SRAM→EEPROM transfer before system reset |
| Standby Current | 200 μA max at 85°C - supports low-power battery-backed operation |
| Hibernate Current | 3 μA max at 85°C - enables ultra-low-power storage mode during extended idle periods |
| Data Retention | 100 years at 55°C, 10 years at 85°C - ensures long-term nonvolatile integrity without refresh |
| Endurance | 100,000 store cycles minimum at 85°C - validated for frequent power-cycle environments |
Pinout & Package
48LM01-I/SM is housed in an 8-lead SOIJ (Small Outline Integrated Circuit, J-bend) package, pin-compatible with SOIC but optimized for automated assembly and thermal performance in industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable; places SO in high-Z when deasserted to support multi-device SPI buses |
| SO | Serial Data Output | MSb-first output; data valid after falling edge of SCK; tri-states immediately on HOLD low |
| VCAP | External Capacitor Terminal | Connects to 47–100 μF capacitor (6.3V+ rating); supplies energy for SRAM→EEPROM transfer during VCC collapse |
| VSS | Ground Reference | System ground return path; must be low-impedance to ensure stable VCAP charging and noise immunity |
| SI | Serial Data Input | MSb-first input; latched on rising edge of SCK; ignored during HOLD active |
| SCK | Serial Clock Input | Master-generated clock; defines SPI Mode 0/3 timing; inactive state polarity determines mode selection |
| HOLD | Hold Input | Pauses ongoing SPI transfer without resetting sequence; requires SCK low to activate/deactivate |
| VCC | Supply Voltage | 2.7–3.6 V operation; internal VCC monitor triggers AutoStore when voltage falls below trip threshold |
Key Features
| Feature | Design Value |
|---|---|
| Unlimited SRAM reads/writes | No wear-out mechanism - SRAM core supports infinite access cycles independent of EEPROM endurance |
| Automatic power-loss backup | Zero-software-intervention SRAM→EEPROM transfer triggered by internal VCC monitoring and VCAP discharge |
| 16-byte nonvolatile user space | Dedicated writeable region for calibration data or configuration flags; backed up alongside SRAM and STATUS register |
| Schmitt-trigger inputs | Enhanced noise immunity on CS, SI, SCK, HOLD - critical for industrial environments with EMI or long trace runs |
| Block write protection | BP[1:0] bits in STATUS register enable hardware-level SRAM partition locking (none, upper quarter, half, or full array) |
Applications
| Industrial Data Logger | Smart Metering Endpoint |
|---|---|
Use Scenario: Continuous sensor sampling and timestamped event storage in remote utility meters with intermittent power. IC Role / Device Role / Timing Role: Primary volatile buffer with automatic nonvolatile persistence on AC dropout or battery depletion. Use Value: Eliminates need for external backup controllers or supercapacitor management ICs while guaranteeing last-known-state recovery. |
Use Scenario: Storing tariff schedules, consumption history, and firmware update staging in electricity/gas/water meters. IC Role / Device Role / Timing Role: Fail-safe memory for critical billing and regulatory data requiring 10+ year retention at elevated ambient temperatures. Use Value: Meets ANSI C12.19 and IEC 62056 standards for data integrity without host MCU involvement during brown-outs. |
| PLC I/O Module Cache | Medical Diagnostic Device Buffer |
Use Scenario: Temporary storage of analog input readings and digital output states in modular industrial controllers. IC Role / Device Role / Timing Role: High-speed SRAM interface for deterministic scan-cycle buffering, backed by EEPROM for safe shutdown logging. Use Value: Enables sub-millisecond read/write latency while preserving operational context across unexpected power loss per IEC 61131-2. |
Use Scenario: Capturing real-time waveform data (ECG, EEG) during portable diagnostic sessions with battery-only operation. IC Role / Device Role / Timing Role: Low-power, high-reliability memory for transient clinical data that must survive sudden battery removal or low-voltage cutoff. Use Value: Achieves <3 μA hibernate current and 100-year data retention at 55°C - compliant with IEC 62304 Class B software safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EERAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 48L512-I/SN | 512-Kbit (65,536 × 8) capacity; same SOIC-8 package; identical AutoStore architecture and timing | Lower density suitable for simpler control nodes or legacy designs with smaller memory footprints | Select when 512 Kbit suffices and board layout uses SOIC-8 footprint; shares same command set and VCAP requirements |
| FM25V01-G | F-RAM-based (not EERAM); 1-Mbit density; 3.3V only; no VCAP capacitor required; unlimited endurance | Better for high-write-frequency applications (e.g., counters, registers); lacks automatic power-loss backup logic | Choose for write-intensive use cases where deterministic latency matters more than zero-software backup; requires different power-fail detection design |
Compared with 48LM01-I/SM, 48L512-I/SN offers halved capacity in a pin-compatible SOIC package, while FM25V01-G replaces EEPROM backup with F-RAM's intrinsic nonvolatility-eliminating VCAP but requiring explicit power-fail signaling for data preservation.
Availability
48LM01-I/SM is available at Aetrix Electronics and suitable for industrial data loggers, smart metering endpoints, PLC I/O modules, and medical diagnostic device buffers requiring stable component supply across extended product lifecycles.
Supply support for 48LM01-I/SM 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 company specializing in microcontrollers, analog devices, and memory solutions for industrial, automotive, and communications markets.
The 48LM01-I/SM belongs to Microchip's EERAM family, designed specifically to replace battery-backed SRAM and simplify nonvolatile data retention in resource-constrained embedded systems without firmware overhead.
FAQ
What is the function of the VCAP pin on the 48LM01-I/SM?
The VCAP pin on the 48LM01-I/SM connects to an external 47–100 μF capacitor that stores charge used to power the internal SRAM→EEPROM transfer during VCC collapse. When system voltage drops below the AutoStore threshold (2.30–2.65 V), the device isolates VCC and draws energy from VCAP to complete the backup before shutdown. This ensures data integrity without external supervision.
Does the 48LM01-I/SM require initialization or special commands to enable AutoStore?
No. AutoStore is enabled by default (ASE bit = 0 in STATUS register) and operates autonomously. The 48LM01-I/SM continuously monitors VCC and initiates SRAM→EEPROM transfer whenever voltage falls below the factory-trimmed trip point. No host MCU intervention, polling, or command execution is needed - the feature is hardware-embedded and always active unless explicitly disabled via WRSR.
Can the 48LM01-I/SM be used with SPI Mode 1 or Mode 2?
No. The 48LM01-I/SM supports only SPI Modes 0 and 3, as confirmed in Section 4.0 of DS20006008C. In both modes, data is latched on the rising edge of SCK and output on the falling edge. Mode 0 uses low-idle SCK; Mode 3 uses high-idle SCK. Modes 1 and 2 (with opposite edge sampling) are not supported and will result in communication failure.
How does the HOLD pin behave during an active SRAM write cycle on the 48LM01-I/SM?
The HOLD pin on the 48LM01-I/SM suspends SPI communication but does not interrupt an ongoing SRAM write cycle. If a WRITE command is in progress when HOLD is asserted, the internal write completes normally. HOLD only pauses instruction/address/data transfer over SI/SO/SCK - it has no effect on the SRAM core or EEPROM backup engine once a write is initiated.
What is the purpose of the 16-byte nonvolatile user space in the 48LM01-I/SM?
The 16-byte nonvolatile user space in the 48LM01-I/SM provides a dedicated, separately addressable region for storing calibration constants, device IDs, or security keys. It is written using WRNUR and read using RDNUR commands, and - like the main SRAM array - is automatically backed up to EEPROM during power loss or via STORE command, ensuring critical metadata survives unattended.
48LM01-I/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EERAM
- Technology:
- EEPROM, SRAM
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K 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-SOIJ
48LM01-I/SM FAQ
1.How can I place an order for 48LM01-I/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 48LM01-I/SM 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 48LM01-I/SM reliable?
The price and inventory of 48LM01-I/SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 48LM01-I/SM is usually 5 days.
3.What payment methods are accepted for 48LM01-I/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 48LM01-I/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 48LM01-I/SM?
48LM01-I/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 48LM01-I/SM 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 48LM01-I/SM?
For technical support, including 48LM01-I/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 48LM01-I/SM requirements.
6.How does Aetrix verify that 48LM01-I/SM is sourced from the original manufacturer or authorized distributors?
All 48LM01-I/SM 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 48LM01-I/SM meets industry standards.
7.What is the process for return or replacement of 48LM01-I/SM?
All 48LM01-I/SM units undergo pre-shipment inspection (PSI). If there is an issue with 48LM01-I/SM, 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 48LM01-I/SM part is unused and in its original packaging.
Return procedure for 48LM01-I/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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