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Renesas R1LP5256ESA-5SI#B0
- Part No.:
- R1LP5256ESA-5SI#B0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
R1LP5256ESA-5SI#B0.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:2,261
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Product details
Overview
R1LP5256ESA-5SI#B0 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 R1LP5256ESA-5SI#B0 datasheet, R1LP5256ESA-5SI#B0 pinout, R1LP5256ESA-5SI#B0 application, or R1LP5256ESA-5SI#B0 equivalent, key selection criteria include TSOP-28 package compatibility, no-refresh operation, data retention down to 2.0V, three-state OR-tie capable outputs, and CS#/OE#/WE# control logic for seamless integration into legacy 8-bit microcontroller buses.
Technical Context
The R1LP5256ESA-5SI#B0 implements a fully static CMOS memory array with asynchronous parallel interface, using address latching via A0–A14 inputs and bidirectional DQ0–DQ7 I/O with independent chip select (CS#), output enable (OE#), and write enable (WE#) controls. Its architecture eliminates refresh circuitry and clock dependencies.
It supports standard read/write cycles with tRC = 55 ns, tAA = 55 ns, and tOE = 30 ns, while enabling low-voltage data retention (VDR = 2.0V) with ICCDR ≤ 10 µA at +85°C-critical for battery backup during power loss in embedded telemetry and metering applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32,768 × 8-bit) - supports full byte-wide data transfers without banking or multiplexing |
| Access time | 55 ns - enables direct interfacing with 8-bit MCUs running at ≤18 MHz system clock |
| Supply voltage | 4.5 V to 5.5 V - compatible with standard 5V logic rails and tolerant of ±5% regulation drift |
| Standby current | 0.6 µA typical at 5.0V/25°C - extends battery life to years in always-on backup mode |
| Data retention voltage | 2.0 V minimum - preserves contents during brown-out or main power failure without external capacitor hold-up |
| I/O interface | TTL-compatible inputs/outputs - eliminates level-shifter requirements when connecting to legacy 5V microcontrollers |
| Package | 28-pin TSOP (8 mm × 13.4 mm) - surface-mount footprint optimized for space-constrained industrial PCBs |
Pinout & Package
Package: 28-pin plastic TSOP (8 mm × 13.4 mm, 1.2 mm height), JEDEC standard MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | Primary 4.5–5.5V supply input; decoupling capacitor required within 10 mm |
| Vss (GND) | Ground reference | Common return path for all signals; must be connected to low-impedance system ground plane |
| A0–A14 | Address inputs | 15-bit address bus accepting 0x0000–0x7FFF; no internal latching-address must be stable before CS# active |
| DQ0–DQ7 | Bidirectional data I/O | 8-bit common bus; high-impedance when CS# high or OE# high; supports wired-OR expansion |
| CS# | Chip select | Active-low enable; places device in standby (high-Z) when high; controls data retention mode |
| WE# | Write enable | Active-low write strobe; initiates write on falling edge concurrent with CS# low |
| OE# | Output enable | Active-low output gate; prevents bus contention during multi-device sharing; independent of CS# |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Eliminates external refresh controller or timer overhead-reduces firmware complexity and BOM count |
| Low-voltage data retention | Maintains stored data at Vcc ≥ 2.0V, enabling reliable backup using coin-cell batteries or supercapacitors |
| Three-state OR-tie outputs | Allows multiple R1LP5256ESA-5SI#B0 devices to share a common data bus without external bus transceivers |
| TTL-compatible signaling | Direct connection to 5V microcontrollers (e.g., Renesas RL78, Intel 8051 derivatives) without level translation |
| Small stand-by current | 0.6 µA typical at 25°C ensures >10-year battery life in always-on backup configurations |
Applications
| Industrial Data Logger | Smart Electricity Meter |
|---|---|
Use Scenario: Continuous logging of sensor readings and event timestamps during mains power outage. IC Role / Device Role / Timing Role: Nonvolatile memory buffer retaining up to 32 KB of critical operational history without refresh. Use Value: Enables >10-year data retention on CR2032 coin cell due to 0.6 µA ISB1 and 2.0V VDR. | Use Scenario: Storing tariff schedules, billing registers, and tamper-event logs in ANSI C12.19-compliant meters. IC Role / Device Role / Timing Role: Battery-backed SRAM holding metrology data across power cycles and firmware updates. Use Value: Meets IEC 62056-21 retention requirements with guaranteed tCDR = 0 ns and tR = 5 ms recovery. |
| Programmable Logic Controller (PLC) I/O Module | Medical Patient Monitor |
Use Scenario: Caching real-time I/O status and configuration parameters in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Fast-access scratchpad memory for deterministic scan-cycle execution under EN 61131-2 timing constraints. Use Value: 55 ns tRC and tAA support 18 MHz bus timing margins while maintaining 5V TTL interoperability. | Use Scenario: Buffering ECG waveform segments and alarm history during AC power interruption in Class II medical devices. IC Role / Device Role / Timing Role: Safety-critical volatile memory with fail-safe data retention during brown-out conditions. Use Value: Validated operation from –40°C to +85°C and <10 µA ISB at +85°C ensures reliability in clinical environments. |
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, 44-pin TSOP | Higher bandwidth but incompatible voltage and bus width; requires redesign of data path and power rail | Select only if migrating to 3.3V system with wider data bus and need faster access |
| AS6C4008-55ZIN | Same 8-bit × 32k organization, 55 ns, 2.7–5.5V supply, 28-pin SOP/TSOP | Wider Vcc range and identical timing/package; slightly higher ISB (1.5 µA typ) | Drop-in replacement for cost-sensitive designs where 0.6 µA standby is not mandatory |
Compared with IS61LV25616AL-10TLI and AS6C4008-55ZIN, the R1LP5256ESA-5SI#B0 delivers superior ultra-low-power standby (0.6 µA vs. ≥1.5 µA) and guaranteed 5V TTL compatibility-making it optimal for legacy 5V industrial systems requiring long-term battery backup.
Availability
R1LP5256ESA-5SI#B0 is available at Aetrix Electronics and suitable for industrial data loggers, smart electricity meters, programmable logic controller I/O modules, and medical patient monitors requiring stable component supply across extended product lifecycles.
Supply support for R1LP5256ESA-5SI#B0 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 SoC solutions for automotive, industrial, infrastructure, and IoT applications.
The R1LP5256E Series targets low-power, battery-operated memory applications-specifically engineered for simplicity of interface, zero-refresh operation, and robust data retention under brown-out conditions in harsh industrial environments.
FAQ
What is the maximum operating temperature range for the R1LP5256ESA-5SI#B0?
The R1LP5256ESA-5SI#B0 is rated for continuous operation from –40°C to +85°C ambient temperature, validated per its DC and AC characteristics tables and thermal derating curves in the official Renesas datasheet R10DS0268EJ0200 Rev.2.00. This range supports deployment in uncontrolled industrial enclosures and outdoor metering equipment without forced cooling.
Does the R1LP5256ESA-5SI#B0 require an external clock or refresh signal?
No, the R1LP5256ESA-5SI#B0 is a fully static RAM and requires no external clock or periodic refresh cycles. Its internal CMOS latch-based memory cells retain data indefinitely as long as Vcc remains within specification and CS# is held high during standby-simplifying system design and reducing MCU resource usage.
Can the R1LP5256ESA-5SI#B0 be used with a 3.3V microcontroller interface?
The R1LP5256ESA-5SI#B0 is specified for 4.5V–5.5V operation only and is not 3.3V-tolerant. Its VIH minimum is 2.2V, but Vcc must be ≥4.5V; interfacing directly with 3.3V logic risks violating absolute maximum ratings and invalidating data integrity. A level-shifting solution is required for mixed-voltage systems.
What is the data retention capability of the R1LP5256ESA-5SI#B0 during power loss?
The R1LP5256ESA-5SI#B0 retains valid data down to Vcc = 2.0V with CS# held high, drawing ≤10 µA at +85°C. Retention is guaranteed for indefinite duration under bias, with tCDR = 0 ns and tR = 5 ms recovery-enabling seamless transition to battery backup without data loss in power-fail scenarios.
Is the R1LP5256ESA-5SI#B0 pin-compatible with other 28-pin TSOP SRAMs like the AS6C4008?
Yes, the R1LP5256ESA-5SI#B0 uses standard 28-pin TSOP pinout (MO-153) matching AS6C4008-55ZIN and similar 8-bit × 32k SRAMs. Pin functions-including A0–A14, DQ0–DQ7, CS#, WE#, OE#, Vcc, and Vss-are identically mapped, enabling mechanical and layout compatibility in most cases.
R1LP5256ESA-5SI#B0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- 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:
- 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#B0 FAQ
1.How can I place an order for R1LP5256ESA-5SI#B0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESA-5SI#B0 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#B0 reliable?
The price and inventory of R1LP5256ESA-5SI#B0 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#B0 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESA-5SI#B0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESA-5SI#B0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESA-5SI#B0?
R1LP5256ESA-5SI#B0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESA-5SI#B0 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#B0?
For technical support, including R1LP5256ESA-5SI#B0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESA-5SI#B0 requirements.
6.How does Aetrix verify that R1LP5256ESA-5SI#B0 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESA-5SI#B0 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#B0 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESA-5SI#B0?
All R1LP5256ESA-5SI#B0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESA-5SI#B0, 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#B0 part is unused and in its original packaging.
Return procedure for R1LP5256ESA-5SI#B0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LP5256ESA-5SI#B0 Tags
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