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Renesas R1LP5256ESP-7SI#S0
- Part No.:
- R1LP5256ESP-7SI#S0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-SOIC (0.330", 8.40mm Width)
- Datasheet:
-
R1LP5256ESP-7SI#S0.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,327
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Product details
Overview
R1LP5256ESP-7SI#S0 from Renesas Electronics is a 256Kb low-power static RAM organized as 32,768 × 8-bit, operating on a single 4.5V–5.5V supply with 55 ns access time, 0.6 µA typical standby current at 5.0V, and TTL-compatible I/O-designed for battery-backed memory systems in industrial controllers and portable instrumentation.
For engineers reviewing the R1LP5256ESP-7SI#S0 datasheet, R1LP5256ESP-7SI#S0 pinout, R1LP5256ESP-7SI#S0 application, or R1LP5256ESP-7SI#S0 equivalent, key selection criteria include low-voltage data retention (down to 2.0V), no-refresh operation, three-state OR-tie capable outputs, and 28-pin SOP packaging compatible with legacy board layouts.
Technical Context
The R1LP5256ESP-7SI#S0 implements a fully static CMOS memory array with asynchronous parallel interface logic, supporting independent chip select (CS#), output enable (OE#), and write enable (WE#) controls. Its architecture eliminates refresh circuitry and clock dependencies, enabling deterministic read/write timing across full temperature range (–40°C to +85°C).
All address (A0–A14), data (DQ0–DQ7), and control inputs are TTL-compatible with VIH ≥ 2.2V and VIL ≤ 0.8V. Output drive strength meets VOH ≥ 2.4V at IOH = –1mA and VOL ≤ 0.4V at IOL = 2mA, ensuring robust bus interfacing without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32k × 8-bit) - supports byte-wide data transfers without external multiplexing |
| Access time | 55 ns - guarantees sub-18 MHz bus operation with margin for setup/hold compliance |
| Supply voltage | 4.5V–5.5V - compatible with standard 5V logic rails and tolerant of ±10% regulation variation |
| Standby current | 0.6 µA typical at 5.0V/25°C - enables multi-year battery backup in always-on monitoring nodes |
| Data retention Vcc | 2.0V minimum - preserves stored values during brown-out or backup-only operation |
| I/O compatibility | TTL - interfaces directly with 74LS, 74HC, and microcontroller GPIO without translators |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded applications |
Pinout & Package
Package: 28-pin plastic SOP (450-mil width), surface-mount, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | Primary 4.5–5.5V supply rail; decoupling required within 10 mm of pin |
| Vss (GND) | Ground reference | Common return path for all I/O and internal logic; must be low-impedance |
| A0–A14 | Address inputs | 15-bit address bus accepting 0x0000–0x7FFF; latched on CS# assertion |
| DQ0–DQ7 | Bidirectional data I/O | Three-state TTL buffers; high-Z when CS# = high or OE# = high |
| CS# | Chip select | Active-low enable controlling address/data buffers and power state entry |
| WE# | Write enable | Active-low signal qualifying write cycles; sampled synchronously with CS# |
| OE# | Output enable | Active-low control for output drivers only; does not affect internal memory state |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Eliminates external refresh controller or timer overhead in microcontroller-based systems |
| Low standby current | 0.6 µA typical enables >10-year battery life in SRAM-retention mode at room temperature |
| OR-tie capability | Three-state outputs allow direct wire-OR connection of multiple devices on shared data bus |
| Easy memory expansion | CS#-based chip selection supports daisy-chained or decoded address decoding schemes |
| Single-supply operation | Removes need for dual-rail regulators or charge pumps in compact PCB designs |
Applications
| Industrial PLC Data Buffer | Portable Medical Instrument Memory |
|---|---|
Use Scenario: Storing real-time sensor logs and configuration parameters in programmable logic controllers with intermittent power loss. IC Role / Device Role / Timing Role: Non-volatile data buffer retaining critical state during mains dropout using battery backup. Use Value: 2.0V data retention threshold ensures reliable holdover even as backup battery depletes to nominal 2.4V. | Use Scenario: Capturing ECG waveform snapshots in handheld diagnostic devices powered by coin-cell batteries. IC Role / Device Role / Timing Role: High-speed, low-power scratchpad memory for temporary waveform storage prior to wireless upload. Use Value: 55 ns access time supports sampling at 10 MSPS with microcontroller DMA, while 0.6 µA standby extends battery life beyond 12 months. |
| Automotive Body Control Module | Legacy Industrial HMI Storage |
Use Scenario: Holding door lock status, lighting presets, and fault codes in automotive BCMs exposed to wide thermal cycling. IC Role / Device Role / Timing Role: Temperature-stable SRAM providing deterministic read/write latency across –40°C to +85°C ambient. Use Value: Guaranteed 55 ns max access time and 8 µA max standby at +70°C ensure consistent behavior under hood conditions. | Use Scenario: Replacing obsolete 28-pin SRAMs in aging factory HMIs where PCB layout cannot be modified. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for legacy 32k×8 SRAMs using identical SOP footprint and signal mapping. Use Value: Identical 28-pin SOP package, TTL I/O levels, and CS#/OE#/WE# control protocol enable zero-change retrofit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS61LV25616AL-10TLI | 16-bit bus width (256K × 16), 10 ns access, 3.3V supply only | Requires bus-width adaptation and level translation; unsuitable for 8-bit systems without glue logic | Select only if migrating to wider data paths and lower voltage domains |
| AS6C4008-55PCN | Same 8-bit bus, 55 ns access, but 2.7–3.6V supply range and 28-pin SOJ package | Not pin-compatible; requires PCB redesign due to different lead pitch and body dimensions | Consider only for new designs targeting 3V operation and SOJ mounting |
Compared with IS61LV25616AL-10TLI and AS6C4008-55PCN, the R1LP5256ESP-7SI#S0 uniquely delivers 5V-tolerant TTL I/O, 28-pin SOP compatibility, and sub-µA standby in a single-package solution optimized for legacy 5V industrial upgrades.
Availability
R1LP5256ESP-7SI#S0 is available at Aetrix Electronics and suitable for industrial PLC data buffering, portable medical instrument memory, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for R1LP5256ESP-7SI#S0 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT applications.
The R1LP5256E Series was developed specifically for low-power, battery-backed memory applications where simplicity, reliability, and long-term data retention outweigh high-speed requirements.
FAQ
What is the maximum operating frequency supported by the R1LP5256ESP-7SI#S0?
The R1LP5256ESP-7SI#S0 does not use a clock and has no maximum operating frequency specification. Its 55 ns access time defines the minimum read/write cycle period (≥18.2 MHz effective rate), but actual throughput depends on system-level timing margins for address setup, hold, and control signal propagation. The R1LP5256ESP-7SI#S0 is designed for asynchronous bus interfacing without clock domain constraints.
Does the R1LP5256ESP-7SI#S0 require external refresh circuitry?
No, the R1LP5256ESP-7SI#S0 is a true static RAM and requires no external refresh circuitry or periodic access to retain data. Its CMOS latch-based memory cells maintain state indefinitely as long as Vcc remains within specification and CS# is held high during standby. This eliminates refresh overhead in microcontroller firmware and simplifies system design compared to DRAM solutions.
Can the R1LP5256ESP-7SI#S0 retain data when Vcc drops below 4.5V?
Yes, the R1LP5256ESP-7SI#S0 supports data retention down to 2.0V Vcc when CS# is held high, enabling reliable operation during brown-out conditions or battery backup scenarios. At 3.0V, typical retention current is 0.6 µA at 25°C, rising to 10 µA at 85°C. Full functionality (read/write) resumes automatically once Vcc returns above 4.5V and stabilization time (tR = 5 ms) elapses.
Is the R1LP5256ESP-7SI#S0 pin-compatible with older Renesas SRAMs like the R1L5256ES?
Yes, the R1LP5256ESP-7SI#S0 shares identical pinout, signal definitions, and electrical characteristics with earlier members of the R1L5256E family, including the R1L5256ES. It maintains full functional and mechanical compatibility in 28-pin SOP packages, allowing direct replacement without PCB modification or firmware changes.
What is the meaning of the "-7SI#S0" suffix in R1LP5256ESP-7SI#S0?
The "-7SI#S0" suffix indicates a 55 ns access time grade (7 = 55 ns), industrial temperature range (–40°C to +85°C), 28-pin SOP package (SP), and embossed tape packaging (S) with assembly revision code 0. This matches Renesas' standardized ordering nomenclature for the R1LP5256E Series, confirming the device's timing, environmental, and packaging specifications.
R1LP5256ESP-7SI#S0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.330", 8.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 70ns
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOP
R1LP5256ESP-7SI#S0 FAQ
1.How can I place an order for R1LP5256ESP-7SI#S0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESP-7SI#S0 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 R1LP5256ESP-7SI#S0 reliable?
The price and inventory of R1LP5256ESP-7SI#S0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1LP5256ESP-7SI#S0 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESP-7SI#S0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESP-7SI#S0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESP-7SI#S0?
R1LP5256ESP-7SI#S0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESP-7SI#S0 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 R1LP5256ESP-7SI#S0?
For technical support, including R1LP5256ESP-7SI#S0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESP-7SI#S0 requirements.
6.How does Aetrix verify that R1LP5256ESP-7SI#S0 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESP-7SI#S0 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 R1LP5256ESP-7SI#S0 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESP-7SI#S0?
All R1LP5256ESP-7SI#S0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESP-7SI#S0, 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 R1LP5256ESP-7SI#S0 part is unused and in its original packaging.
Return procedure for R1LP5256ESP-7SI#S0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LP5256ESP-7SI#S0 Tags
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