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Microchip Technology 23LC512-E/ST
- Part No.:
- 23LC512-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
23LC512-E/ST.pdf
- Description:
- IC SRAM 512KBIT SPI/QUAD 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,392
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Product details
Overview
23LC512-E/ST from Microchip Technology is a 512-Kbit serial SRAM with SPI/SDI/SQI interface, operating at 20 MHz clock rate over 2.5V–5.5V supply, supporting byte/page/sequential read/write modes and zero write time. It delivers 3 mA read current at 5.5V/20 MHz and 4 µA standby current at +85°C, used in microcontroller-based data buffering and real-time logging applications.
For engineers reviewing the 23LC512-E/ST datasheet, 23LC512-E/ST pinout, 23LC512-E/ST application, or 23LC512-E/ST equivalent, key selection criteria include VCC range (2.5–5.5 V), industrial/extended temperature support (–40°C to +125°C), SDI/SQI mode compatibility, 32-byte page size, and HOLD functionality availability only in SPI/SDI modes.
Technical Context
The 23LC512-E/ST implements a serial SRAM architecture with an 8-bit instruction register and MSB-first data transfer protocol. It supports three configurable operation modes-Byte (00), Page (10), and Sequential (01)-via a writable MODE register, enabling flexible memory access granularity without address rollover constraints in sequential mode.
It features dual- and quad-I/O capability via EDIO/EQIO commands, with SDI using SIO0/SIO1 and SQI using SIO0–SIO3. HOLD functionality is active in SPI/SDI but disabled in SQI mode due to pin sharing, and SO transitions to high-impedance during HOLD assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8-bit) - provides 65,536 bytes of volatile RAM for temporary data storage |
| Interface | SPI/SDI/SQI - enables interoperability with standard SPI controllers, dual-data-rate hosts, or quad-data-rate SoCs |
| Max Clock Frequency | 20 MHz (I-temp), 16 MHz (E-temp) - determines maximum sustained data throughput (up to 20 MB/s in SQI mode) |
| Supply Voltage | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V logic systems without level shifting |
| Read Current | 3 mA at 5.5 V, 20 MHz - defines active power budget during continuous memory access |
| Standby Current | 4 µA at +85°C - enables ultra-low-power retention in battery-backed or energy-constrained systems |
| Page Size | 32 bytes - sets minimum efficient write block size and influences burst transaction efficiency |
| Data Retention Voltage | 1.0 V minimum - ensures RAM contents persist during brown-out or controlled power-down sequences |
Pinout & Package
23LC512-E/ST is packaged in an 8-lead TSSOP (ST) with 0.65 mm pitch, 3.0 mm × 4.4 mm body, and RoHS-compliant matte tin finish. Pin 1 is marked by a beveled corner or dot; leads are gull-wing shaped with 0.25 mm nominal width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: pulls device into active state; high = standby + SO tri-stated for bus sharing |
| SO/SIO1 | Serial Output / SDI/SQI Data Line | Primary output in SPI; dual-input in SDI; quad-input in SQI - shared function requires mode-aware PCB routing |
| SIO2 | SQI Data Line | Second quad I/O line - unused in SPI/SDI; must be terminated or tied per SQI timing requirements |
| VSS | Ground Reference | System ground return path; decoupling capacitor required within 5 mm of VCC/VSS pair |
| SI/SIO0 | Serial Input / SDI/SQI Data Line | Primary input in SPI; dual-input in SDI; quad-input in SQI - shares pin with SO in bidirectional configurations |
| SCK | Serial Clock Input | Edge-triggered synchronous clock; rising edge latches SI, falling edge updates SO |
| HOLD/SIO3 | Hold Control / SQI Data Line | Pauses ongoing SPI transaction without reset; disabled in SQI mode due to pin reuse |
| VCC | Power Supply | 2.5–5.5 V core supply; requires 100 nF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Unlimited Read/Write Cycles | Enables indefinite in-field reconfiguration and logging without wear-out concerns |
| Zero Write Time | Eliminates wait states after write command - improves deterministic latency in real-time control loops |
| Three Access Modes (Byte/Page/Sequential) | Allows optimization of bandwidth vs. address overhead: byte for random access, sequential for streaming |
| SDI/SQI High-Speed Modes | Doubles or quadruples effective throughput versus standard SPI - reduces host CPU load and bus occupancy |
| HOLD Functionality (SPI/SDI only) | Permits interruption of multi-byte transfers without losing internal address pointer state |
| Extended Temperature Range (–40°C to +125°C) | Validates operation in under-hood automotive, industrial motor drives, and outdoor IoT deployments |
Applications
| Industrial PLC Data Buffering | Automotive Telematics Logging |
|---|---|
Use Scenario: Storing sensor fusion outputs and CAN message timestamps in programmable logic controllers during transient power loss. IC Role / Device Role / Timing Role: Volatile SRAM buffer interfacing directly with ARM Cortex-M7 MCU via SPI at 20 MHz, holding up to 64 KB of pre-processed process data. Use Value: Zero write time ensures no data loss during rapid state changes; 4 µA standby preserves content across brief brown-outs without backup battery. | Use Scenario: Capturing GPS position, accelerometer, and diagnostic trouble codes in vehicle black-box recorders during crash events. IC Role / Device Role / Timing Role: High-reliability serial SRAM operating in E-temp range (–40°C to +125°C), accessed via SQI mode for burst capture of 100+ ms pre-crash telemetry. Use Value: 16 MHz SQI mode enables >6 MB/s effective throughput; 1.0 V data retention voltage allows graceful save-on-fail during main rail collapse. |
| Medical Infusion Pump Memory | Smart Meter Firmware Cache |
Use Scenario: Holding dosage history, calibration coefficients, and alarm logs in Class II medical devices requiring traceable, non-volatile-adjacent storage. IC Role / Device Role / Timing Role: SPI-connected SRAM used alongside external EEPROM; accessed by PIC18F MCU for low-latency parameter reads and writes during therapy delivery. Use Value: Unlimited endurance eliminates replacement cycles; 2.5–5.5 V VCC range matches pump's 3.3 V system rail and simplifies power design. | Use Scenario: Caching firmware update fragments and metering registers in ANSI C12.22-compliant smart electricity meters deployed in utility substations. IC Role / Device Role / Timing Role: Page-mode SRAM (32-byte pages) storing encrypted OTA packet payloads prior to CRC validation and flash programming. Use Value: Page write capability reduces SPI transaction count by 32× vs. byte mode; industrial temp rating ensures reliability at 85°C ambient cabinet temperatures. |
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/ST | 1 Mbit capacity (128K × 8), same 2.5–5.5 V VCC, identical pinout and instruction set | Requires no layout change; doubles memory depth for larger buffers or extended logging duration | Select when >64 KB RAM is needed without altering firmware SPI driver or PCB footprint |
| IS66WV51216BLL-10MLI | Parallel-interface 8 Mbit SRAM (512K × 16), 3.3 V only, 10 ns access, 44-pin TSOP | Requires full bus interface redesign, higher pin count, and different timing control logic | Choose only if system demands nanosecond-level random access latency and parallel bus infrastructure already exists |
Compared with 23LC1024-I/ST, the 23LC512-E/ST offers lower density and smaller package but maintains identical timing, voltage, and software compatibility; versus IS66WV51216BLL-10MLI, it trades raw speed and width for serial simplicity, reduced pin count, and direct microcontroller GPIO compatibility.
Availability
23LC512-E/ST is available at Aetrix Electronics and suitable for industrial automation, automotive telematics, medical device data buffering, and smart metering applications requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for 23LC512-E/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 leading provider of microcontrollers, analog, FPGA, and memory solutions, serving industrial, automotive, communications, and consumer markets with vertically integrated silicon and development tools.
The 23LC512-E/ST belongs to Microchip's serial SRAM product line, designed specifically for low-pin-count, high-reliability data buffering in resource-constrained embedded systems where SPI connectivity and extended temperature resilience are critical.
FAQ
What is the maximum clock frequency supported by the 23LC512-E/ST in extended temperature range?
The 23LC512-E/ST supports a maximum clock frequency of 16 MHz when operating across the extended temperature range (–40°C to +125°C). This is explicitly specified in Table 1-2 of the DS20005155C datasheet under "AC CHARACTERISTICS" and applies to all timing parameters including FCLK, TCSS, and TV. At industrial temperature (–40°C to +85°C), the device operates up to 20 MHz.
Does the 23LC512-E/ST support Quad SPI (QSPI) mode, and what pins are used?
Yes, the 23LC512-E/ST supports Serial Quad Interface (SQI) mode using pins SIO0 (SI/SIO0), SIO1 (SO/SIO1), SIO2, and SIO3 (HOLD/SIO3). The EQIO command (0x38) enables SQI mode. However, HOLD functionality is disabled in SQI mode due to pin sharing, and pin 3 (SIO2) must not be left floating during SQI operation per datasheet Section 3.8.
What is the meaning of "zero write time" for the 23LC512-E/ST?
"Zero write time" means the 23LC512-E/ST completes each write operation internally without requiring additional clock cycles or wait states after the final data bit is clocked in. Once CS is deasserted, the write is complete and the device is immediately ready for the next command - eliminating software delays or polling for write completion, which is critical for deterministic real-time systems.
Can the 23LC512-E/ST retain data during power loss, and at what minimum voltage?
Yes, the 23LC512-E/ST retains RAM data down to a minimum VCC of 1.0 V, as specified in Parameter D011 (VDR) of the DC Characteristics table. Below this threshold, data loss occurs. This retention voltage enables reliable save-on-fail behavior during brown-out conditions, provided the system can monitor VCC and trigger a final write before crossing 1.0 V.
Is the 23LC512-E/ST pin-compatible with the 23A512 series, and what are the key electrical differences?
No, the 23LC512-E/ST is not pin-compatible with the 23A512 series despite identical pinout numbering - they differ in VCC range (23LC512: 2.5–5.5 V; 23A512: 1.7–2.2 V) and are not interchangeable on the same PCB without voltage rail redesign. Both share the same instruction set and timing, but mixing them risks overvoltage damage to 23A512 or insufficient drive strength for 23LC512.
23LC512-E/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
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 16 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
23LC512-E/ST FAQ
1.How can I place an order for 23LC512-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 23LC512-E/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 23LC512-E/ST reliable?
The price and inventory of 23LC512-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 23LC512-E/ST is usually 5 days.
3.What payment methods are accepted for 23LC512-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23LC512-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 23LC512-E/ST?
23LC512-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 23LC512-E/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 23LC512-E/ST?
For technical support, including 23LC512-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23LC512-E/ST requirements.
6.How does Aetrix verify that 23LC512-E/ST is sourced from the original manufacturer or authorized distributors?
All 23LC512-E/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 23LC512-E/ST meets industry standards.
7.What is the process for return or replacement of 23LC512-E/ST?
All 23LC512-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 23LC512-E/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 23LC512-E/ST part is unused and in its original packaging.
Return procedure for 23LC512-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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