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Microchip Technology 23LC1024-I/P
- Part No.:
- 23LC1024-I/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
23LC1024-I/P.pdf
- Description:
- IC SRAM 1MBIT SPI/QUAD 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:306
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Product details
Overview
23LC1024-I/P from Microchip Technology is a 1 Mbit (128K × 8) industrial-grade SPI Serial SRAM operating from 2.5V to 5.5V, supporting byte/page/sequential read/write modes, 20 MHz clock rate (I-temp), and dual/quad interface (SDI/SQI) capability. It delivers zero write time, unlimited endurance, and 4 µA standby current at +85°C - used in microcontroller-based data buffering for industrial control and sensor logging.
For engineers reviewing the 23LC1024-I/P datasheet, 23LC1024-I/P pinout, 23LC1024-I/P application, or 23LC1024-I/P equivalent, this page provides verified electrical specs, package mapping to 8-lead PDIP, confirmed SDI/SQI timing behavior, and real-world interface constraints including HOLD functionality limitations in quad mode.
Technical Context
The 23LC1024-I/P implements a serial memory controller with three configurable access modes (Byte, Page, Sequential) selected via a writable MODE register (bits 7–6). Its SPI-compatible bus supports standard single-data-rate operation plus enhanced SDI (2-bit/clock) and SQI (4-bit/clock) protocols using dedicated SIO0–SIO3 pins.
It features hardware-level HOLD suspension (active-low, functional only in SPI/SDI modes), automatic address rollover on array boundary, and internal address pointer incrementing during burst transfers. The device powers up in Standby mode (CS = high) and requires CS low-to-high transition to initiate any command sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (128K × 8 bits); supports full random-access addressing across 24-bit address space (0x000000–0x1FFFFF) |
| VCC Range | 2.5V to 5.5V; compatible with 3.3V and 5V logic systems without level shifting |
| Max Clock Frequency | 20 MHz at Industrial temp (−40°C to +85°C); enables ~2.5 MB/s peak throughput in quad mode |
| Read Current | 3 mA at 5.5V/20 MHz; defines active power budget during sustained data streaming |
| Standby Current | 4 µA at +85°C; enables ultra-low-power retention in battery-backed or energy-harvesting systems |
| Page Size | 32 bytes; constrains maximum atomic write length in Page mode before wraparound occurs |
| Data Retention Voltage | 1.0 V minimum VCC; guarantees RAM data integrity during brown-out or backup-battery operation |
Pinout & Package
23LC1024-I/P is packaged in an 8-lead Plastic Dual In-line Package (PDIP), 300 mil body width, through-hole mountable. Pin 1 is marked with a notch or dot; pin numbering follows standard counter-clockwise layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select Input | Active-low enable; forces device into Standby (high-Z SO) when high; required low pulse initiates all commands |
| 2 (SO/SIO1) | Serial Output / SDI/SQI I/O 1 | Tri-state output in SPI mode; bidirectional in SDI/SQI; latched on SCK rising edge (input), updated after falling edge (output) |
| 3 (SIO2) | Serial I/O 2 | Used only in SQI mode; must not float - tie high if unused to ensure safe recovery from accidental EQIO command |
| 4 (VSS) | Ground Reference | Primary return path for all digital and analog currents; requires low-impedance connection to system ground plane |
| 5 (SI/SIO0) | Serial Input / SDI/SQI I/O 0 | Input-only in SPI mode; bidirectional in SDI/SQI; data latched on SCK rising edge |
| 6 (SCK) | Serial Clock Input | Synchronizes all data transfers; rising edge clocks input data, falling edge updates output data |
| 7 (HOLD/SIO3) | Hold Input / SQI I/O 3 | HOLD active-low suspend in SPI/SDI modes; becomes bidirectional I/O in SQI mode (HOLD function disabled) |
| 8 (VCC) | Power Supply | Supplies core logic and memory array; requires local 0.1 µF ceramic decoupling capacitor placed near pin |
Key Features
| Feature | Design Value |
|---|---|
| Unlimited Read/Write Cycles | Enables continuous logging or buffer reuse without wear-out concerns - no refresh or erase cycles needed |
| Zero Write Time | Eliminates write latency overhead; data written immediately upon CS high assertion - no wait states or polling required |
| SDI & SQI Interface Support | Doubles (SDI) or quadruples (SQI) effective throughput vs. standard SPI - critical for high-speed firmware/data streaming |
| Industrial Temperature Range | Rated for −40°C to +85°C operation - validated for deployment in factory automation, motor drives, and outdoor instrumentation |
| Page and Sequential Modes | Reduces command overhead: Page mode auto-increments within 32-byte boundaries; Sequential mode wraps across full 128K address space |
Applications
| Industrial Data Logger | Microcontroller Peripheral Buffer |
|---|---|
Use Scenario: Captures sensor readings (temperature, pressure, vibration) at 1 kHz over 24-hour periods in unattended remote sites. IC Role / Device Role / Timing Role: Acts as volatile high-speed scratchpad memory for PIC® or ARM Cortex-M MCU, interfacing via SPI with 20 MHz clock to sustain 2.5 MB/s burst writes. Use Value: Eliminates need for external NAND/NOR flash wear leveling; zero write time ensures no sample loss during power interruption. | Use Scenario: Temporarily stores USB HID report packets or CAN message queues in embedded gateway devices before Ethernet forwarding. IC Role / Device Role / Timing Role: Provides low-latency, deterministic-access buffer between protocol stacks - accessed in Sequential mode to minimize command overhead per packet. Use Value: 4 µA standby current extends battery life in always-on gateways; 2.5–5.5V range matches wide-input DC-DC outputs. |
| Programmable Logic Controller (PLC) I/O Cache | Medical Diagnostic Instrument Memory |
Use Scenario: Holds real-time I/O state snapshots (digital inputs/outputs, analog channel values) for safety-critical cycle monitoring in PLC backplanes. IC Role / Device Role / Timing Role: Functions as deterministic-access shadow RAM synchronized to 10 ms control loop - accessed in Byte mode for individual bit manipulation. Use Value: Unlimited endurance prevents field failures from repeated state updates; industrial temp rating ensures reliability inside metal enclosures. | Use Scenario: Stores waveform buffers (ECG, EEG) during acquisition prior to compression and storage on SD card in portable diagnostic tools. IC Role / Device Role / Timing Role: Serves as high-bandwidth acquisition buffer interfaced via SQI to reduce SPI bus occupancy - enabling concurrent processing of prior frames. Use Value: 20 MHz SQI mode achieves 10 MB/s effective throughput - sufficient for multi-channel 10-bit @ 1 MSps sampling without bottleneck. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 23LC1024-I/SN | Same die, SOIC-8 package (3.9 mm width); 150°C max solder reflow rating vs. PDIP's 260°C | Better suited for automated SMT assembly; less suitable for prototyping or socket-based test fixtures | Select for volume production PCBs where surface-mount footprint and thermal profile align with assembly process. |
| 23LC1024T-I/P | Identical electrical specs and PDIP package, but supplied in tape-and-reel (T-suffix) instead of tube (no T-suffix) | Optimized for pick-and-place machine feeding; same pinout and soldering requirements as 23LC1024-I/P | Choose for high-volume manufacturing lines requiring automated placement; otherwise, 23LC1024-I/P (tube) is preferred for engineering samples and small-batch builds. |
Compared with 23LC1024-I/SN and 23LC1024T-I/P, the 23LC1024-I/P offers direct through-hole compatibility for lab validation and legacy board upgrades, while maintaining identical timing, voltage, and endurance specs - making it the default choice for design-in flexibility and manual assembly.
Availability
23LC1024-I/P is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and programmable logic controllers requiring stable component supply with guaranteed long-term sourcing.
Supply support for 23LC1024-I/P 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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 23LC1024-I/P belongs to Microchip's serial SRAM product line, engineered specifically for low-latency, high-reliability data buffering in resource-constrained embedded systems where EEPROM endurance or flash write latency are unacceptable.
FAQ
What is the maximum clock frequency supported by the 23LC1024-I/P in industrial temperature range?
The 23LC1024-I/P supports up to 20 MHz clock frequency when operated across its full industrial temperature range of −40°C to +85°C. This specification is validated per DS20005142C-page 3 AC CHARACTERISTICS table (Param. No. 1, FCLK). Exceeding 20 MHz may result in timing violations or data corruption, especially under worst-case voltage and temperature conditions. The 23LC1024-I/P does not support higher frequencies even with reduced load or ideal conditions.
Does the 23LC1024-I/P support Quad SPI (QSPI) mode, and how is it enabled?
Yes, the 23LC1024-I/P supports Serial Quad Interface (SQI) mode, which transfers four bits per clock cycle. It is enabled by issuing the EQIO command (0x38) via SPI. Once activated, pins SIO2 and HOLD/SIO3 become bidirectional data lines (SIO2 and SIO3), and the HOLD function is disabled. To revert, the RSTIO command (0xFF) must be sent in SQI mode - not SPI mode - as specified in DS20005142C-page 16–18.
What is the standby current consumption of the 23LC1024-I/P at +85°C?
The standby current of the 23LC1024-I/P is 4 µA maximum at +85°C, measured with CS = VCC = 5.5V and all inputs tied to VCC or VSS (DS20005142C-page 3, Param. No. D009). This value reflects worst-case leakage under industrial temperature stress and confirms suitability for battery-powered applications requiring multi-year shelf life or low-duty-cycle operation.
Can the 23LC1024-I/P retain data when VCC drops below normal operating voltage?
Yes, the 23LC1024-I/P guarantees data retention down to 1.0 V VCC (DS20005142C-page 3, Param. No. D011, VDR). Below this threshold, RAM contents are not assured. This feature allows integration with brown-out detection circuits or backup batteries, ensuring data integrity during controlled power-down sequences - but does not imply operation or read/write functionality at sub-2.5V levels.
Is the HOLD function available in all interface modes of the 23LC1024-I/P?
No, the HOLD function is only available in SPI and SDI modes. When the 23LC1024-I/P is configured in SQI mode (via EQIO command), the HOLD/SIO3 pin becomes a bidirectional data line (SIO3), and the HOLD suspend capability is disabled entirely (DS20005142C-page 13, Section 3.6). Attempting to assert HOLD in SQI mode has no effect on serial communication.
23LC1024-I/P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- SPI - Quad 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
23LC1024-I/P FAQ
1.How can I place an order for 23LC1024-I/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 23LC1024-I/P 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 23LC1024-I/P reliable?
The price and inventory of 23LC1024-I/P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 23LC1024-I/P is usually 5 days.
3.What payment methods are accepted for 23LC1024-I/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23LC1024-I/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 23LC1024-I/P?
23LC1024-I/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 23LC1024-I/P 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 23LC1024-I/P?
For technical support, including 23LC1024-I/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23LC1024-I/P requirements.
6.How does Aetrix verify that 23LC1024-I/P is sourced from the original manufacturer or authorized distributors?
All 23LC1024-I/P 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 23LC1024-I/P meets industry standards.
7.What is the process for return or replacement of 23LC1024-I/P?
All 23LC1024-I/P units undergo pre-shipment inspection (PSI). If there is an issue with 23LC1024-I/P, 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 23LC1024-I/P part is unused and in its original packaging.
Return procedure for 23LC1024-I/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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