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Renesas R1LV5256ESP-7SR#B0
- Part No.:
- R1LV5256ESP-7SR#B0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-SOIC (0.330", 8.40mm Width)
- Datasheet:
-
R1LV5256ESP-7SR#B0.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,307
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Product details
Overview
R1LV5256ESP-7SR#B0 from Renesas Electronics is a 256Kb low-power static RAM organized as 32,768 × 8-bit, fabricated in 0.15µm CMOS/TFT process, operating from a single 2.7V–3.6V supply with 55ns access time, 0.6µA typical standby current at 3.0V, and TTL-compatible I/O - deployed in battery-backed memory subsystems for portable instrumentation and industrial control.
For engineers reviewing the R1LV5256ESP-7SR#B0 datasheet, R1LV5256ESP-7SR#B0 pinout, R1LV5256ESP-7SR#B0 application, or R1LV5256ESP-7SR#B0 equivalent, key selection criteria include low-voltage data retention down to 2.0V, no-refresh operation, chip-select expandability, three-state OR-tie capable outputs, and compatibility with legacy 28-pin SOP footprint designs.
Technical Context
The R1LV5256ESP-7SR#B0 implements a fully asynchronous SRAM architecture with independent address decoding, sense/write amplifiers, and clock-free operation - eliminating refresh circuitry and timing overhead. Its dual-buffered control path isolates CS#, WE#, and OE# inputs to ensure deterministic read/write transitions without internal synchronization delays.
All I/O pins are TTL-compatible (VIH = 2.0V min, VIL = 0.6V max), and the device supports seamless memory expansion via active-low chip select (CS#) with automatic high-impedance output disable during deselect. Standby mode is entered when CS# is high, reducing ICC to ≤0.33mA (max) and ISB1 to 0.6µA (typ) at +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256Kb (32k × 8-bit) - provides byte-wide data interface compatible with 8-bit microcontrollers and legacy bus architectures. |
| Access time | 55 ns - guarantees full-speed operation with MCUs and FPGAs requiring sub-60ns memory response, e.g., ARM7 or CPLD-based controllers. |
| Supply voltage | 2.7V–3.6V - enables direct integration into 3.3V systems without level-shifting and supports brown-out tolerant battery backup down to 2.0V retention. |
| Standby current | 0.6 µA (typ @ 3.0V, +25°C) - extends battery life in always-on monitoring nodes where memory must retain data for months on coin-cell power. |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade deployment in programmable logic controllers, medical handhelds, and automotive body-control modules. |
| I/O compatibility | TTL - ensures plug-and-play interoperability with legacy 5V-tolerant peripherals and simplifies mixed-voltage board design without external translators. |
| Package | 28-pin SOP (450-mil) - matches standard PCB footprints used in existing industrial control boards and allows drop-in replacement of prior-generation LPSRAMs. |
Pinout & Package
Package: 28-pin plastic SOP (450-mil), JEDEC MS-012AC compliant, body dimension 17.9mm × 7.5mm × 2.35mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply input | Single 2.7–3.6V supply rail; decoupling capacitor required within 10mm for stable read/write margins. |
| Vss (GND) | Ground reference | Common return for all signals; must be connected to system ground plane with low-inductance path. |
| A0–A14 | Address inputs | 15-bit address bus accepting 0x0000–0x7FFF; latched on rising edge of CS# for read, or falling edge of WE# for write. |
| DQ0–DQ7 | Bidirectional data I/O | Three-state TTL-compatible bus; driven during read (OE# = L, CS# = L), high-Z during write or disable (OE# = H or CS# = H). |
| CS# | Chip select | Active-low enable; places device in standby (high-Z I/O) when high; initiates address decoding and memory access when low. |
| WE# | Write enable | Active-low control; asserts write cycle when low and CS# low; must overlap DQ valid window per tDW/tDH timing. |
| OE# | Output enable | Active-low control; gates output drivers; prevents bus contention when multiple devices share DQ lines. |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Eliminates external refresh controller and associated firmware overhead - reduces BOM count and system power by ~1.2mA typical in continuous operation. |
| Low-voltage data retention | Maintains stored data at Vcc ≥ 2.0V with ISB1 ≤ 10µA up to +85°C - enables reliable backup during brown-out events in battery-powered field instruments. |
| OR-tie capability | Three-state outputs allow wired-OR connection of multiple R1LV5256ESP-7SR#B0 devices on shared DQ bus - simplifies memory expansion without external bus transceivers. |
| Easy memory expansion | CS#-based chip selection supports daisy-chained or decoded addressing schemes - enables 512KB+ memory banks using standard 74LVC138 or FPGA logic. |
| TTL-compatible interface | Direct connection to 3.3V/5V microcontrollers (e.g., STM32F1, PIC18F) without level shifters - cuts layout complexity and signal integrity risk. |
Applications
| Portable Medical Monitor | Industrial PLC Data Logger |
|---|---|
|
Use Scenario: Battery-powered ECG monitor storing waveform snapshots during intermittent wireless transmission. IC Role / Device Role / Timing Role: Nonvolatile buffer memory holding 32KB of raw sensor data between BLE bursts; retains content during sleep cycles. Use Value: 0.6µA standby current extends coin-cell life beyond 12 months; 55ns access enables real-time capture at 10ksps sampling rate. |
Use Scenario: DIN-rail mounted controller logging machine status every 100ms into local memory before Ethernet upload. IC Role / Device Role / Timing Role: Primary working RAM for cyclic data buffering; interfaces directly to Cortex-M4 MCU's 8-bit external bus. Use Value: –40°C to +85°C rating ensures reliability in unconditioned factory environments; SOP package supports automated reflow assembly. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: Door module storing fault codes, calibration offsets, and user preferences across ignition cycles. IC Role / Device Role / Timing Role: Retentive configuration memory accessed only during initialization or diagnostics; powered from always-on 3.3V rail. Use Value: 2.0V data retention threshold prevents corruption during cold-crank voltage sag (down to 2.2V); no refresh eliminates timing jitter in safety-critical boot path. |
Use Scenario: Utility meter retaining tariff tables, consumption history, and tamper logs during mains outage. IC Role / Device Role / Timing Role: Backup memory backed by supercapacitor; holds >10 years of hourly kWh data with CRC-protected writes. Use Value: Low 0.33mA max standby current minimizes supercap discharge rate; TTL I/O avoids extra level-shifter IC in cost-sensitive BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS61LV25616AL-10TLI | 16-bit bus (128K × 16), 10ns access, 3.3V-only supply, 32-pin TSOP | Higher bandwidth but incompatible pinout and data width; requires PCB redesign and bus-width adaptation. | Select when system demands >256KB capacity or faster access; not suitable for direct R1LV5256ESP-7SR#B0 replacement. |
| AS6C4008-55ZIN | 2.7–5.5V supply range, 55ns access, 28-pin SOP, 0.8µA standby (typ) | Wider voltage tolerance and identical package/pinout; slightly higher standby current but same functional interface. | Valid drop-in alternative where extended Vcc range (up to 5.5V) is needed; verified pin-compatible per datasheet pin mapping. |
Compared with IS61LV25616AL-10TLI and AS6C4008-55ZIN, the R1LV5256ESP-7SR#B0 offers optimal balance of ultra-low standby current, industrial temperature support, and proven 28-pin SOP compatibility - making it preferred for space-constrained, battery-sensitive designs where pin-for-pin continuity is critical.
Availability
R1LV5256ESP-7SR#B0 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC data loggers, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for R1LV5256ESP-7SR#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 R1LV5256E Series was designed specifically for low-power, battery-operated memory applications demanding zero-refresh operation, wide temperature resilience, and simple TTL-level interfacing - targeting portable instrumentation and industrial control systems.
FAQ
What is the minimum supply voltage for data retention in R1LV5256ESP-7SR#B0?
The R1LV5256ESP-7SR#B0 maintains stored data down to Vcc = 2.0V, as specified in the Low Vcc Data Retention Characteristics table. At this voltage, the device enters data retention mode when CS# is held high (≥ Vcc − 0.2V), and typical retention current is 0.6µA at +25°C. This enables reliable operation during brown-out conditions in battery-powered systems without external backup capacitors.
Is R1LV5256ESP-7SR#B0 pin-compatible with older Renesas LPSRAMs like R1LV0208ES?
No, R1LV5256ESP-7SR#B0 is not pin-compatible with R1LV0208ES. The R1LV0208ES is a 128Kb (16k × 8) device in 28-pin SOP but uses different pin assignments for A12–A14 and lacks dedicated OE# functionality. R1LV5256ESP-7SR#B0 follows the standardized 28-pin SOP pinout defined in the R1LV5256E Series datasheet, with A0–A14 mapped to pins 1–2, 21–28, and OE# on pin 20.
Does R1LV5256ESP-7SR#B0 require external refresh circuitry?
No, the R1LV5256ESP-7SR#B0 is a true static RAM and requires no refresh cycles. Its architecture uses flip-flop-based memory cells that retain data indefinitely as long as power is applied and CS# remains low during active use. This eliminates refresh timing constraints, simplifies firmware, and removes associated power spikes seen in DRAM-based solutions.
Can R1LV5256ESP-7SR#B0 be used with a 5V microcontroller system?
R1LV5256ESP-7SR#B0 is not 5V-tolerant: its absolute maximum input voltage is Vcc + 0.3V (≤3.9V at 3.6V supply), and VIH is specified as 2.0V minimum. Direct connection to 5V logic will exceed voltage ratings and risk damage. Interface requires level translation (e.g., TXB0108) or use of a 3.3V-compatible MCU such as the NXP LPC1769 or Microchip PIC32MX.
What is the maximum operating current of R1LV5256ESP-7SR#B0 during active read cycles?
The R1LV5256ESP-7SR#B0 draws up to 25mA average operating current (ICC1) under worst-case conditions: minimum cycle time, 100% duty cycle, and all I/O loaded. This value is measured at Vcc = 3.6V and Ta = +85°C. Typical ICC1 is 14mA at 3.0V and +25°C, enabling thermal design with minimal heatsinking in compact enclosures.
R1LV5256ESP-7SR#B0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.330", 8.40mm Width)
- Packaging:
- Tube
- 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:
- 70ns
- Access Time:
- 70 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOP
R1LV5256ESP-7SR#B0 FAQ
1.How can I place an order for R1LV5256ESP-7SR#B0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LV5256ESP-7SR#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 R1LV5256ESP-7SR#B0 reliable?
The price and inventory of R1LV5256ESP-7SR#B0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1LV5256ESP-7SR#B0 is usually 5 days.
3.What payment methods are accepted for R1LV5256ESP-7SR#B0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LV5256ESP-7SR#B0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LV5256ESP-7SR#B0?
R1LV5256ESP-7SR#B0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LV5256ESP-7SR#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 R1LV5256ESP-7SR#B0?
For technical support, including R1LV5256ESP-7SR#B0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LV5256ESP-7SR#B0 requirements.
6.How does Aetrix verify that R1LV5256ESP-7SR#B0 is sourced from the original manufacturer or authorized distributors?
All R1LV5256ESP-7SR#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 R1LV5256ESP-7SR#B0 meets industry standards.
7.What is the process for return or replacement of R1LV5256ESP-7SR#B0?
All R1LV5256ESP-7SR#B0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LV5256ESP-7SR#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 R1LV5256ESP-7SR#B0 part is unused and in its original packaging.
Return procedure for R1LV5256ESP-7SR#B0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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