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Microchip Technology 23LCV1024-I/ST
- Part No.:
- 23LCV1024-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
23LCV1024-I/ST.pdf
- Description:
- IC SRAM 1MBIT SPI/DUAL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,785
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Product details
Overview
23LCV1024-I/ST from Microchip Technology Inc. is a 1 Mbit (128K × 8) industrial-grade SPI Serial SRAM with battery backup support, SDI dual-interface capability, and 20 MHz clock rate. It operates across 2.5–5.5 V, delivers 3 mA read current at 5.5 V/20 MHz, and maintains data retention down to 1.0 V via VBAT. It serves as nonvolatile buffer memory in power-loss-critical embedded systems such as smart meters and industrial controllers.
For engineers reviewing the 23LCV1024-I/ST datasheet, 23LCV1024-I/ST pinout, 23LCV1024-I/ST application, or 23LCV1024-I/ST equivalent, this page provides verified package mapping (8-lead TSSOP), confirmed SDI/SPI mode behavior, VBAT switchover threshold (1.6–2.0 V), page/sequential/byte operation modes, and real-world timing constraints including 25 ns CS setup and 25 ns output valid delay.
Technical Context
The 23LCV1024-I/ST implements a true serial SRAM architecture with no internal refresh circuitry, enabling unlimited read/write cycles and zero write time. Its instruction register accepts 8-bit opcodes (e.g., 0x02 for WRITE, 0x03 for READ, 0x3B for EDIO) and supports MSB-first 24-bit addressing with 7 MSBs as "don't care" bits.
It features dual-mode interface logic: standard SPI (SI/SO/SCK/CS) and SDI (SIO0/SIO1/SCK/CS), where SDI mode requires explicit entry via EDIO command and exit via RSTIO. The MODE register (bits 7–6) selects Byte (00), Page (10), or Sequential (01) operation - defaulting to Sequential on power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 1 Mbit (128K × 8) - supports full array sequential access without page boundary wrap in Sequential mode |
| Interface protocol | SPI-compatible + SDI dual I/O - enables 2× data throughput vs. SPI when master supports dual mode |
| Max clock frequency | 20 MHz - defines maximum sustained data transfer rate of 2.5 MB/s in SPI mode (1 byte/clock) |
| VCC range | 2.5–5.5 V - compatible with 3.3 V and 5 V microcontroller I/O domains without level shifting |
| VBAT switchover | 1.6–2.0 V (typ. 1.8 V) - ensures seamless transition to backup supply before VCC drops below RAM retention voltage (1.0 V) |
| Standby current | 4 µA at +85°C - enables multi-year coin-cell backup operation in low-power monitoring applications |
| Page size | 32 bytes - constrains burst writes to page-aligned boundaries in Page mode; prevents unintended wraparound |
Pinout & Package
23LCV1024-I/ST is packaged in an 8-lead TSSOP (4.4 mm body width), RoHS-compliant and halogen-free, with 1.27 mm pitch and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select Input | Active-low enable; forces device into Standby mode and SO into high-impedance when high |
| 2 SO/SIO1 | Serial Output / SDI Data Pin 1 | Outputs data during SPI reads; functions as bidirectional data line in SDI mode |
| 3 NC | No Connect | Internally unconnected; must be left floating or tied to GND per layout best practice |
| 4 VSS | Ground Reference | Primary return path for VCC and VBAT supplies; requires low-inductance connection to system ground plane |
| 5 SI/SIO0 | Serial Input / SDI Data Pin 0 | Accepts instructions/addresses/data in SPI mode; bidirectional in SDI mode |
| 6 SCK | Serial Clock Input | Synchronizes all data transfers; rising edge latches SI/SIO0, falling edge updates SO/SIO1 |
| 7 VBAT | External Backup Supply | Provides hold power when VCC < VTRIP; requires 1.4–3.6 V source (e.g., CR2032) |
| 8 VCC | Primary Power Supply | Supplies core logic and memory array; decoupling capacitor (0.1 µF) required within 5 mm |
Key Features
| Feature | Design Value |
|---|---|
| Unlimited endurance | Supports infinite read/write cycles - eliminates wear-leveling firmware overhead in logging applications |
| Zero write time | Eliminates write latency; data is stored immediately upon CS deassertion - critical for power-fail capture |
| SDI dual-interface mode | Doubles effective throughput vs. SPI using same clock frequency - reduces bus occupancy in bandwidth-constrained designs |
| Battery backup with auto-switchover | Internal analog switch transitions cleanly at 1.6–2.0 V - preserves RAM contents during brownout without external supervision circuitry |
| Three configurable access modes | Byte (single-location), Page (32-byte burst), Sequential (full-array wrap) - enables optimal trade-off between address overhead and burst efficiency |
Applications
| Smart Energy Metering | Industrial PLC Data Logging |
|---|---|
Use Scenario: Captures real-time energy consumption data during AC mains failure, preserving last valid readings until power restoration. IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer with automatic VBAT switchover; retains data without software intervention during VCC dropout. Use Value: Guarantees >10-year data integrity on CR2032 coin cell due to 4 µA standby current and 1.0 V data retention voltage. | Use Scenario: Stores process alarm timestamps and sensor history in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: High-reliability serial memory interfaced directly to PIC MCU SPI port; supports burst writes via Page mode for efficient log updates. Use Value: Eliminates EEPROM wear-out concerns and enables 20 MHz logging speed - 4× faster than typical I²C EEPROMs. |
| Medical Diagnostic Equipment | Automotive Telematics Control Unit |
Use Scenario: Buffers ECG waveform samples during brief power interruptions in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-latency memory with zero write time - captures final pre-failure sample without missing edge-triggered events. Use Value: Meets IEC 60601-1 short-interruption immunity requirements via sub-100 ns CS-to-data-valid timing and guaranteed 1.0 V retention. | Use Scenario: Stores GPS position history and CAN bus error logs in vehicle telematics units subject to engine cranking voltage dips. IC Role / Device Role / Timing Role: Dual-supply SRAM with VBAT hold; maintains critical crash data even when battery voltage collapses to 6 V during cranking. Use Value: VTRIP range (1.6–2.0 V) ensures switchover occurs well above minimum CAN transceiver operating voltage (1.71 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14V101QS-SPXC | 1 Mbit nvSRAM with integrated lithium battery; no external VBAT required; 16-pin SOIC | Higher BOM cost but eliminates coin-cell holder and backup circuit design effort | Select when board space allows larger package and long-term maintenance-free operation is prioritized over component count |
| FM25V01-G | F-RAM with 1 Mbit density; 3.3 V only; 20 MHz SPI; no VBAT pin; 10¹⁴ write cycles | Lower standby current (200 nA) but lacks battery backup; requires external supercapacitor for hold time | Select when ultra-low power is critical and backup duration is limited to seconds/minutes rather than years |
Compared with CY14V101QS-SPXC and FM25V01-G, the 23LCV1024-I/ST offers lowest total system cost for decade-long battery-backed logging, direct 2.5–5.5 V compatibility, and flexible SDI mode for bandwidth scaling - without requiring redesign of power architecture or PCB layout.
Availability
23LCV1024-I/ST is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical diagnostics, automotive telematics, and battery-powered IoT edge nodes requiring stable component supply across extended product lifecycles.
Supply support for 23LCV1024-I/ST 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 embedded control applications.
The 23LCV1024-I/ST belongs to Microchip's serial SRAM product line, designed specifically for reliable, low-power, battery-backed data buffering in industrial and automotive systems where EEPROM endurance or Flash write latency are limiting factors.
FAQ
What is the VBAT voltage range and switchover behavior for the 23LCV1024-I/ST?
The 23LCV1024-I/ST accepts VBAT between 1.4 V and 3.6 V. Its internal analog switch transitions from VCC to VBAT when VCC falls below the VTRIP threshold of 1.6–2.0 V (typ. 1.8 V). Once switched, the device maintains SRAM data as long as VBAT remains ≥1.0 V - the specified data retention voltage. This behavior is fully autonomous and requires no firmware intervention.
Does the 23LCV1024-I/ST support true dual-SPI (quad I/O) or only dual I/O (SDI)?
The 23LCV1024-I/ST supports Serial Dual Interface (SDI), not quad I/O. SDI uses two data lines (SIO0 and SIO1) to transfer two bits per clock cycle, doubling throughput versus standard SPI. It does not support Quad SPI (QSPI) commands or four-line data transfer. Entry into SDI mode requires issuing the EDIO (0x3B) command; exit requires RSTIO (0xFF).
What are the timing constraints for reliable CS-controlled read operations on the 23LCV1024-I/ST?
For reliable read operations, the 23LCV1024-I/ST requires CS setup time (TCSS) ≥25 ns before first SCK rising edge, CS hold time (TCSH) ≥50 ns after last SCK falling edge, and CS disable time (TCSD) ≥25 ns before next access. Output data is valid within 25 ns after SCK falling edge (TV), and output hold time (THO) is 0 ns - meaning data may change on the next SCK rising edge.
How does the MODE register affect operation of the 23LCV1024-I/ST, and what is its default state?
The MODE register (accessed via RDMR/WRMR commands) controls access mode via bits 7–6: 00 = Byte, 10 = Page, 01 = Sequential (default on power-up). Bits 0–5 are reserved and must be written as '0'. The default Sequential mode enables continuous read/write across the full 128K address space with automatic rollover at 0x1FFFF, eliminating manual address management.
Can the 23LCV1024-I/ST be used without connecting the VBAT pin?
Yes - the VBAT pin may be left unconnected or tied to VSS if battery backup is not required. The device operates normally in standard SPI/SDI mode with VCC alone. However, doing so forfeits data retention during power loss. When unused, Microchip recommends connecting VBAT to VSS to prevent floating node noise coupling into the internal switchover comparator.
23LCV1024-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Synchronous
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- SPI - Dual I/O
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
23LCV1024-I/ST FAQ
1.How can I place an order for 23LCV1024-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 23LCV1024-I/ST 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 23LCV1024-I/ST reliable?
The price and inventory of 23LCV1024-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 23LCV1024-I/ST is usually 5 days.
3.What payment methods are accepted for 23LCV1024-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23LCV1024-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 23LCV1024-I/ST?
23LCV1024-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 23LCV1024-I/ST 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 23LCV1024-I/ST?
For technical support, including 23LCV1024-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23LCV1024-I/ST requirements.
6.How does Aetrix verify that 23LCV1024-I/ST is sourced from the original manufacturer or authorized distributors?
All 23LCV1024-I/ST 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 23LCV1024-I/ST meets industry standards.
7.What is the process for return or replacement of 23LCV1024-I/ST?
All 23LCV1024-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 23LCV1024-I/ST, 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 23LCV1024-I/ST part is unused and in its original packaging.
Return procedure for 23LCV1024-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
23LCV1024-I/ST Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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