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Renesas R1LP5256ESA-5SI#S1
- Part No.:
- R1LP5256ESA-5SI#S1
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
R1LP5256ESA-5SI#S1.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:4,835
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Product details
Overview
R1LP5256ESA-5SI#S1 from Renesas Electronics is a 256Kb low-power static RAM organized as 32,768 × 8-bit, operating from 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 in industrial controllers and portable instrumentation.
For engineers reviewing the R1LP5256ESA-5SI#S1 datasheet, R1LP5256ESA-5SI#S1 pinout, R1LP5256ESA-5SI#S1 application, or R1LP5256ESA-5SI#S1 equivalent, key selection criteria include TSOP-28 package compatibility, no-refresh operation, data retention down to 2.0V VCC, three-state output capability, and CS#/OE#/WE# control logic for seamless integration into legacy 8-bit microcontroller systems.
Technical Context
The R1LP5256ESA-5SI#S1 implements a fully static memory architecture with no internal clocks or refresh circuitry, relying on address decoding and asynchronous control signals (CS#, OE#, WE#) to manage read/write cycles. Its block diagram confirms direct connection between address buffer, row/column decoders, and sense/write amplifiers without timing dependencies beyond tRC (55 ns), tAA (55 ns), and tOE (30 ns).
It supports OR-tie bus expansion via three-state outputs and prevents data contention using OE#-controlled output disable. Standby mode is activated by high CS#, reducing current to ≤10 µA at +85°C while retaining data at VCC ≥ 2.0V-enabling reliable backup during brownout conditions in embedded systems.
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 max; enables direct interfacing with 8-bit MCUs running at ≤18 MHz system clock |
| Supply voltage | 4.5V–5.5V; compatible with standard 5V logic rails and tolerant of ±5% regulation variation |
| Standby current | 0.6 µA typical at 25°C; extends battery life in always-on backup applications |
| Data retention VCC | 2.0V min; maintains stored data during power loss or deep sleep modes |
| I/O interface | TTL-compatible inputs/outputs; eliminates level-shifting requirements in legacy 5V designs |
| Operating temperature | −40°C to +85°C; qualified for industrial-grade deployment in uncontrolled environments |
Pinout & Package
Package: 28-pin plastic TSOP (8 mm × 13.4 mm), JEDEC standard, surface-mount compatible with reflow soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | Primary 4.5–5.5V supply input; must be decoupled locally to suppress switching noise |
| Vss (GND) | Ground reference | Common return path for all digital and I/O circuits; requires low-inductance connection |
| A0–A14 | Address inputs | 15-bit address bus supporting full 32k-word addressing; no latching required |
| DQ0–DQ7 | Bi-directional data I/O | Common data bus with three-state control; enables shared bus topology with other peripherals |
| CS# | Chip select (active-low) | Enables memory access when low; places device in ultra-low-power standby when high |
| WE# | Write enable (active-low) | Controls write cycle initiation; asserts write operation only when CS# and WE# are both low |
| OE# | Output enable (active-low) | Gates output drivers; prevents bus contention during multi-device sharing or CPU read cycles |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Eliminates external refresh controller or timer overhead-reduces firmware complexity and BOM count |
| Low standby current (0.6 µA) | Extends battery life in backup memory applications beyond 10 years under typical conditions |
| TTL-compatible I/O | Direct interface with legacy 5V microcontrollers (e.g., 8051, Z80, PIC18F) without level shifters |
| OR-tie capability | Supports parallel memory expansion using wired-OR bus configurations without external logic |
| Data retention at 2.0V | Maintains valid contents during brownout or battery depletion-critical for nonvolatile state preservation |
Applications
| Industrial PLC Data Buffer | Medical Device Parameter Storage |
|---|---|
Use Scenario: Storing real-time sensor logs and configuration settings in programmable logic controllers during mains power interruption. IC Role / Device Role / Timing Role: Non-refreshing SRAM providing deterministic 55 ns read/write latency and guaranteed data retention at 2.0V VCC. Use Value: Enables uninterrupted operation through brief outages and preserves critical process state without supercapacitor or backup battery overhead. | Use Scenario: Holding calibration coefficients and patient-specific therapy parameters in portable infusion pumps and ECG monitors. IC Role / Device Role / Timing Role: Battery-backed memory with sub-microamp standby draw and TTL-level compatibility with analog front-end microcontrollers. Use Value: Meets IEC 62304 Class C software safety requirements by ensuring parameter integrity across power cycles and low-voltage events. |
| Automotive Body Control Module | Test Equipment Configuration Memory |
Use Scenario: Storing door lock status, lighting presets, and fault codes in 12V-powered BCMs with wide input voltage transients. IC Role / Device Role / Timing Role: Industrial-temperature SRAM interfaced directly to 8-bit automotive MCUs via CS#/OE#/WE# control lines. Use Value: Withstands load-dump spikes up to 7.0V and operates reliably from −40°C to +85°C without derating. | Use Scenario: Retaining instrument calibration tables and user-defined test sequences in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: High-reliability static RAM with 55 ns access and zero refresh overhead for deterministic firmware execution. Use Value: Eliminates periodic memory refresh interrupts-ensuring precise timing-critical measurement cycles remain unperturbed. |
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 (256K × 16), 10 ns access, 3.3V-only supply | Requires 16-bit data path and voltage translation for 5V systems | Select only if migrating to 3.3V design with wider bus bandwidth needs |
| AS6C4008-55ZIN | Same 32k × 8 organization, 55 ns access, but 2.7–3.6V supply range | Not suitable for 5V-only legacy systems; lacks 2.0V data retention | Prefer for new 3.3V designs where lower active current outweighs retention voltage requirement |
Compared with IS61LV25616AL-10TLI and AS6C4008-55ZIN, the R1LP5256ESA-5SI#S1 uniquely combines 5V operation, 2.0V data retention, and TSOP-28 packaging-making it the only drop-in solution for industrial 5V systems requiring battery backup without redesign.
Availability
R1LP5256ESA-5SI#S1 is available at Aetrix Electronics and suitable for industrial PLC data buffering, medical device parameter storage, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for R1LP5256ESA-5SI#S1 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 headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.
The R1LP5256E Series was developed to deliver low-power, no-refresh SRAM for battery-operated and backup-critical applications-emphasizing reliability, TTL compatibility, and industrial temperature resilience over raw speed or density scaling.
FAQ
What is the maximum operating frequency supported by the R1LP5256ESA-5SI#S1?
The R1LP5256ESA-5SI#S1 does not operate on a clock signal-it is an asynchronous SRAM. Its performance is defined by access timing: 55 ns maximum address access time (tAA) and 55 ns read cycle time (tRC). When interfaced with an 8-bit MCU, this supports effective throughput up to ~18 MHz without wait states, assuming proper setup/hold timing compliance.
Does the R1LP5256ESA-5SI#S1 require external refresh circuitry?
No, the R1LP5256ESA-5SI#S1 is a true static RAM and requires no refresh cycles or external refresh control. Its internal latch-based memory cells retain data indefinitely as long as power is applied and CS# remains asserted. This eliminates timing-critical refresh overhead in firmware and simplifies system design.
Can the R1LP5256ESA-5SI#S1 retain data at voltages below 4.5V?
Yes-the R1LP5256ESA-5SI#S1 guarantees data retention down to 2.0V VCC when CS# is held high. At 3.0V, typical data retention current is 0.6 µA at 25°C, rising to 10 µA at +85°C. This feature enables robust battery-backup operation during brownout or main power failure scenarios.
Is the R1LP5256ESA-5SI#S1 pin-compatible with other 28-pin TSOP SRAMs like the CY62256?
No-while both use 28-pin TSOP packages, the R1LP5256ESA-5SI#S1 has distinct pin assignments: A14 is on pin 28, Vcc on pin 27, and GND on pin 15. The CY62256 places Vcc on pin 28 and GND on pin 14. Direct replacement requires PCB layout revision due to incompatible pinout.
What is the meaning of the "#S1" suffix in R1LP5256ESA-5SI#S1?
The "#S1" suffix indicates embossed tape packaging (8 mm carrier tape) and revision code "1" for assembly site or process change per Renesas ordering nomenclature. It does not affect electrical specifications or functionality-the R1LP5256ESA-5SI#S1 shares identical AC/DC characteristics and timing with R1LP5256ESA-5SI#B* (tray-packaged variant).
R1LP5256ESA-5SI#S1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 55ns
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP I
R1LP5256ESA-5SI#S1 FAQ
1.How can I place an order for R1LP5256ESA-5SI#S1 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESA-5SI#S1 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 R1LP5256ESA-5SI#S1 reliable?
The price and inventory of R1LP5256ESA-5SI#S1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1LP5256ESA-5SI#S1 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESA-5SI#S1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESA-5SI#S1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESA-5SI#S1?
R1LP5256ESA-5SI#S1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESA-5SI#S1 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 R1LP5256ESA-5SI#S1?
For technical support, including R1LP5256ESA-5SI#S1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESA-5SI#S1 requirements.
6.How does Aetrix verify that R1LP5256ESA-5SI#S1 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESA-5SI#S1 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 R1LP5256ESA-5SI#S1 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESA-5SI#S1?
All R1LP5256ESA-5SI#S1 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESA-5SI#S1, 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 R1LP5256ESA-5SI#S1 part is unused and in its original packaging.
Return procedure for R1LP5256ESA-5SI#S1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LP5256ESA-5SI#S1 Tags
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