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Renesas R1LP5256ESP-5SI#S1
- Part No.:
- R1LP5256ESP-5SI#S1
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-SOIC (0.330", 8.40mm Width)
- Datasheet:
-
R1LP5256ESP-5SI#S1.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,402
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Product details
Overview
R1LP5256ESP-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 systems in industrial controllers and portable instrumentation.
For engineers reviewing the R1LP5256ESP-5SI#S1 datasheet, R1LP5256ESP-5SI#S1 pinout, R1LP5256ESP-5SI#S1 application, or R1LP5256ESP-5SI#S1 equivalent, key selection criteria include its no-refresh operation, OR-tie capable three-state outputs, CS#-controlled data retention down to 2.0V, and compatibility with legacy 28-pin SOP-based memory interfaces.
Technical Context
The R1LP5256ESP-5SI#S1 implements a fully static memory architecture with no internal clocks or refresh circuitry, relying on address decoding and control signal timing (CS#, WE#, OE#) to manage read/write cycles. Its block diagram confirms separate column/row decoders, sense/write amplifiers, and address/data buffers-all fabricated in 0.15 µm CMOS/TFT process for low leakage.
It supports two distinct write modes (WE#-clocked and CS#-clocked), with defined timing parameters including tAW = 50 ns, tWP = 40 ns, and tOHZ ≤ 20 ns. Data retention is guaranteed at Vcc ≥ 2.0V when CS# is held high, with ICCDR ≤ 10 µA at +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32k × 8-bit): provides byte-wide data bus interface without external data multiplexing |
| Access time | 55 ns max: enables direct interfacing with 12–15 MHz microcontrollers without wait states |
| Supply voltage | 4.5–5.5 V: compatible with standard 5V logic rails and tolerant of ±10% regulation variation |
| Standby current | 0.6 µA typical at 5.0V/25°C: extends battery life in always-on backup memory applications |
| Data retention Vcc | 2.0 V min: maintains stored data during brown-out or backup battery operation |
| I/O compatibility | TTL input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (VOH ≥ 2.4 V @ –1 mA): ensures interoperability with legacy 5V logic families |
| Package | 28-pin SOP (450-mil): industry-standard footprint supporting through-hole and surface-mount assembly |
Pinout & Package
Package: 28-pin plastic SOP (450-mil), JEDEC MS-012AC compliant, body width 10.16 mm, lead pitch 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | Primary 4.5–5.5 V supply rail; decoupling capacitor required within 10 mm |
| Vss (GND) | Ground reference | Common return path for all signals and power; must be low-impedance connection |
| A0–A14 | Address inputs | 15-bit address bus accepting 0x0000–0x7FFF; latched on CS#/WE# transition per timing spec |
| DQ0–DQ7 | Bidirectional data I/O | Byte-wide data path with three-state control via OE# and CS#; supports OR-tie bus sharing |
| CS# | Chip select (active low) | Enables memory array; controls data retention mode when high and Vcc ≥ 2.0 V |
| WE# | Write enable (active low) | Initiates write cycle when CS# is low; timing-critical for tWP ≥ 40 ns pulse width |
| OE# | Output enable (active low) | Gates output drivers; prevents bus contention during shared-memory or multi-device configurations |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Eliminates external refresh controller or timer overhead, reducing firmware complexity and system power |
| Low standby current (0.6 µA) | Enables >10-year data retention on coin-cell batteries in tamper-proof logging or metering devices |
| CS#-controlled data retention | Automatically enters ultra-low-power retention mode when chip is deselected, independent of OE#/WE# state |
| Three-state outputs with OR-tie capability | Allows multiple R1LP5256ESP-5SI#S1 devices to share a common data bus without external bus transceivers |
| TTL-compatible signaling | Direct interface with 8051, Z80, and legacy microcontroller families without level-shifting components |
Applications
| Industrial Data Logger | Medical Infusion Pump Memory |
|---|---|
Use Scenario: Stores calibration coefficients, usage logs, and fault history in battery-powered field instruments with infrequent writes but long-term data integrity requirements. IC Role / Device Role / Timing Role: Non-volatile SRAM buffer retaining critical settings during main power loss or battery swap. Use Value: 0.6 µA standby current and 2.0 V data retention threshold ensure >5 years of backup operation on CR2032 cells. | Use Scenario: Holds real-time dosage parameters and safety-critical configuration data in Class II medical devices requiring continuous memory availability. IC Role / Device Role / Timing Role: Primary working memory with fail-safe retention during AC power interruption or battery transition. Use Value: 55 ns access time supports deterministic response to motor control interrupts; no refresh eliminates timing jitter in safety-critical paths. |
| Point-of-Sale Terminal EEPROM Backup | Legacy PLC Configuration Storage |
Use Scenario: Mirrors flash-based configuration storage to prevent corruption during power-down sequences in retail terminals. IC Role / Device Role / Timing Role: High-reliability shadow RAM co-located with microcontroller for atomic write operations. Use Value: OR-tie capability allows seamless integration into existing 8-bit data buses without redesigning PCB trace routing. | Use Scenario: Stores ladder logic runtime variables and I/O mapping tables in programmable logic controllers with extended temperature operation. IC Role / Device Role / Timing Role: Temperature-hardened (–40°C to +85°C) static RAM serving as volatile program workspace. Use Value: 28-pin SOP package matches legacy board layouts; TTL compatibility avoids adapter redesign for aging control systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS61LV25616AL-10TLI | 16-bit bus (256K × 16), 10 ns access, 3.3 V only, 44-pin TSOP | Higher density and speed but incompatible voltage and bus width; requires PCB redesign | Select only if migrating to 3.3 V systems and needing wider data path |
| AS6C4008-55PCN | Same 32k × 8 organization, 55 ns access, 4.5–5.5 V, 28-pin SOP-but 2.0 mA typical standby current | Pin-compatible drop-in replacement with higher power consumption in standby | Acceptable for non-battery applications where layout reuse is prioritized over ultra-low power |
Compared with IS61LV25616AL-10TLI and AS6C4008-55PCN, the R1LP5256ESP-5SI#S1 uniquely balances 5V compatibility, 28-pin SOP footprint, and sub-µA standby-making it the only option for retrofitting legacy 5V systems requiring multi-year battery backup without board changes.
Availability
R1LP5256ESP-5SI#S1 is available at Aetrix Electronics and suitable for industrial data loggers, medical infusion pumps, point-of-sale terminals, and legacy PLCs requiring stable component supply across extended product lifecycles.
Supply support for R1LP5256ESP-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 automotive, industrial, and infrastructure markets.
The R1LP5256E Series was developed to deliver ultra-low-power, no-refresh SRAM for battery-critical applications-targeting instrumentation, medical devices, and industrial controllers where reliability under voltage stress and long-term data retention are mandatory.
FAQ
What is the maximum operating temperature range for the R1LP5256ESP-5SI#S1?
The R1LP5256ESP-5SI#S1 is rated for continuous operation from –40°C to +85°C ambient temperature, validated per DC and AC specifications in the official Renesas datasheet R10DS0268EJ0200 Rev.2.00. This range covers industrial environments including factory automation equipment and outdoor metering hardware where thermal cycling is expected.
Does the R1LP5256ESP-5SI#S1 require an external clock or refresh signal?
No, the R1LP5256ESP-5SI#S1 is a fully static RAM with no internal clock or refresh circuitry. It retains data indefinitely as long as Vcc remains within specification and CS# is held high during standby. This eliminates timing constraints associated with DRAM refresh cycles and simplifies system design.
Can the R1LP5256ESP-5SI#S1 retain data when Vcc drops below 4.5 V?
Yes-the R1LP5256ESP-5SI#S1 guarantees data retention down to Vcc = 2.0 V when CS# is held high (≥ Vcc – 0.2 V), as specified in the Low Vcc Data Retention Characteristics table. At 3.0 V, typical retention current is 0.6 µA, enabling multi-year operation on small backup batteries.
Is the R1LP5256ESP-5SI#S1 pin-compatible with other 28-pin SOP SRAMs like the 62256 family?
The R1LP5256ESP-5SI#S1 uses standard 28-pin SOP pinout matching JEDEC MS-012AC, with identical Vcc, GND, address, data, and control signal placements as industry-standard 32k × 8 SRAMs. However, timing parameters (e.g., tAA = 55 ns) and standby current differ-system validation is required before substitution.
What is the meaning of the "#S1" suffix in R1LP5256ESP-5SI#S1?
The "#S1" suffix in R1LP5256ESP-5SI#S1 indicates embossed tape packaging (per Renesas ordering information), where "S" denotes tape-and-reel and "1" is the revision code for assembly site. This differs from "#B" (tube packaging) and does not affect electrical or functional characteristics of the R1LP5256ESP-5SI#S1 device itself.
R1LP5256ESP-5SI#S1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.330", 8.40mm 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-SOP
R1LP5256ESP-5SI#S1 FAQ
1.How can I place an order for R1LP5256ESP-5SI#S1 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESP-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 R1LP5256ESP-5SI#S1 reliable?
The price and inventory of R1LP5256ESP-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 R1LP5256ESP-5SI#S1 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESP-5SI#S1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESP-5SI#S1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESP-5SI#S1?
R1LP5256ESP-5SI#S1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESP-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 R1LP5256ESP-5SI#S1?
For technical support, including R1LP5256ESP-5SI#S1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESP-5SI#S1 requirements.
6.How does Aetrix verify that R1LP5256ESP-5SI#S1 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESP-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 R1LP5256ESP-5SI#S1 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESP-5SI#S1?
All R1LP5256ESP-5SI#S1 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESP-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 R1LP5256ESP-5SI#S1 part is unused and in its original packaging.
Return procedure for R1LP5256ESP-5SI#S1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LP5256ESP-5SI#S1 Tags
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