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Renesas R1LV5256ESA-7SR#B0
- Part No.:
- R1LV5256ESA-7SR#B0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
R1LV5256ESA-7SR#B0.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,239
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Product details
Overview
R1LV5256ESA-7SR#B0 from Renesas Electronics is a 256Kb low-power static RAM organized as 32,768 × 8-bit, operating from a single 2.7–3.6V supply, with 70ns access time, 0–+70°C temperature range, and packaged in 28-pin TSOP (PTSA0028ZA-A). It serves as non-volatile memory backup buffer in battery-powered instrumentation and portable industrial controllers requiring zero-refresh operation and TTL-compatible interfacing.
For engineers reviewing the R1LV5256ESA-7SR#B0 datasheet, R1LV5256ESA-7SR#B0 pinout, R1LV5256ESA-7SR#B0 application, or R1LV5256ESA-7SR#B0 equivalent, key selection criteria include standby current ≤8μA at +70°C, chip-select–controlled data retention down to 2.0V Vcc, three-state OR-tie capable I/Os, and compatibility with legacy 28-pin SRAM footprints in space-constrained embedded systems.
Technical Context
This device implements a fully static CMOS architecture with no internal clocks or refresh circuitry, relying on address latch control via CS#, WE#, and OE# signals. Its memory array uses high-performance 0.15μm CMOS and TFT processes to achieve low active current (ICC1 ≤25mA) and ultra-low standby current (ISB ≤8μA at +70°C).
The R1LV5256ESA-7SR#B0 supports asynchronous read/write cycles with defined timing windows including tAA = 70ns, tOE = 35ns, tWC = 70ns, and tWP = 50ns. All inputs/outputs are TTL-compatible, and output enable (OE#) prevents bus contention during shared-data-bus operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256Kb (32,768 × 8-bit) - provides byte-wide data path for microcontroller peripherals without external data-width conversion. |
| Supply Voltage | 2.7–3.6V - compatible with 3.3V logic rails and enables direct connection to Li-ion battery-backed systems. |
| Access Time | 70ns - supports reliable interface with mid-speed MCUs (e.g., ARM7, RL78, or legacy 8051 derivatives) without wait states. |
| Standby Current | ≤8μA at +70°C - extends battery life in always-on monitoring nodes where memory must retain data during sleep modes. |
| Operating Temperature | 0 to +70°C - qualified for commercial-grade industrial control panels, test equipment, and medical handheld devices. |
| Data Retention Vcc | 2.0V minimum - allows memory contents to persist during brown-out conditions or battery voltage sag below nominal 2.7V. |
| Package | 28-pin TSOP (PTSA0028ZA-A, 8mm × 13.4mm) - surface-mount footprint optimized for compact PCB layouts with standard reflow profiles. |
Pinout & Package
Package: 28-pin plastic TSOP (normal-bend type), JEDEC MO-153 compliant, body size 8mm × 13.4mm, lead pitch 0.55mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | Primary 2.7–3.6V supply input; decoupling capacitor required within 10mm for stable read/write operation. |
| Vss | Ground | Signal and power ground reference; must be connected to low-impedance system ground plane. |
| A0–A14 | Address inputs | 15-bit address bus supporting full 32k-word addressing; driven by MCU address lines A0–A14. |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus with three-state outputs; supports OR-tie configuration when multiple devices share same bus. |
| CS# | Chip select | Active-low enable controlling all internal buffers; high state places outputs in high-Z and enables data retention mode. |
| WE# | Write enable | Active-low write strobe; combined with CS# low initiates write cycle; must meet tWP ≥50ns pulse width. |
| OE# | Output enable | Active-low control for output drivers; prevents bus contention when multiple SRAMs or peripherals share DQ lines. |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Eliminates need for external refresh circuitry or periodic CPU intervention-ideal for ultra-low-power sleep modes. |
| TTL-compatible I/O | Direct interface with 3.3V microcontrollers and FPGAs without level-shifting components or additional logic. |
| Chip-select–controlled data retention | Enters ultra-low-power retention mode (ICCDR ≤10μA) automatically when CS# is high, even at Vcc = 2.0V. |
| OR-tie capability | Three-state outputs allow multiple R1LV5256ESA-7SR#B0 devices to share a common data bus without external bus transceivers. |
| Common data I/O | Reduces pin count and simplifies PCB routing versus separate data-in/data-out architectures. |
Applications
| Portable Data Loggers | Industrial HMI Panels |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 1Hz intervals over 72 hours. IC Role / Device Role / Timing Role: Non-volatile data buffer storing timestamped samples during main MCU sleep cycles; retains data across power interruptions. Use Value: Enables 70ns read access for rapid sample retrieval upon wake-up and consumes ≤8μA in standby-extending coin-cell battery life beyond 1 year. |
Use Scenario: Touch-enabled operator interface in factory automation cabinet with real-time alarm history and recipe storage. IC Role / Device Role / Timing Role: Fast-access scratchpad memory for GUI frame buffers and transient process data; interfaces directly to 3.3V ARM Cortex-M4 MCU. Use Value: 70ns access time eliminates wait states; OR-tie capability allows expansion to 16-bit data bus using two devices without added logic. |
| Medical Diagnostic Handhelds | Test & Measurement Equipment |
Use Scenario: Portable ECG analyzer capturing waveform segments and performing on-device FFT analysis before wireless upload. IC Role / Device Role / Timing Role: High-reliability intermediate storage for raw ADC samples prior to DSP processing; operates within 0–+70°C ambient range. Use Value: Single 3.3V supply simplifies power design; TTL compatibility avoids signal integrity issues at board-level interconnects. |
Use Scenario: Benchtop multimeter storing calibration coefficients, measurement logs, and user configurations across power cycles. IC Role / Device Role / Timing Role: Configuration memory retaining critical parameters during main power-off; supports data retention down to 2.0V Vcc. Use Value: Guarantees parameter persistence during brown-out events; 28-pin TSOP footprint fits legacy instrument PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS61LV25616AL-10TLI | 16-bit bus (256K × 16), 10ns access, 3.3V only, 44-pin TSOP | Higher bandwidth but larger footprint and higher power; requires PCB redesign. | Select when 16-bit data path and sub-10ns timing are mandatory; not drop-in compatible. |
| AS6C4008-70SCN | 256K × 8-bit, 70ns, 2.7–3.6V, 28-pin SOP (PRSP0028DB-B) | Same electrical specs but 450-mil SOP package; incompatible pinout and thermal profile vs. TSOP. | Choose for through-hole prototyping or legacy SOP-based designs; no PCB reuse possible. |
Compared with IS61LV25616AL-10TLI and AS6C4008-70SCN, the R1LV5256ESA-7SR#B0 uniquely combines 28-pin TSOP packaging, 70ns timing, and guaranteed data retention at 2.0V-making it optimal for compact, battery-sensitive designs where footprint and low-Vcc robustness outweigh raw speed or bus width.
Availability
R1LV5256ESA-7SR#B0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial HMIs, and medical handhelds requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for R1LV5256ESA-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 memory solutions for automotive, industrial, and enterprise applications.
The R1LV5256E Series was designed specifically for low-voltage, low-power memory applications in battery-operated and energy-conscious embedded systems-emphasizing simplicity, reliability, and seamless integration with 3.3V logic families.
FAQ
What is the maximum operating temperature range for R1LV5256ESA-7SR#B0?
The R1LV5256ESA-7SR#B0 is rated for operation from 0°C to +70°C (commercial grade). This range is confirmed in the ordering information table on page 1 of the R10DS0068EJ0100 datasheet and applies specifically to the "R" suffix variants like R1LV5256ESA-7SR#B0. Operation outside this range may result in timing violations or data retention failure.
Does R1LV5256ESA-7SR#B0 require a refresh clock or external refresh controller?
No, the R1LV5256ESA-7SR#B0 is a true static RAM and requires no refresh clock or external refresh controller. Its architecture uses latched flip-flops for each memory cell, enabling indefinite data retention as long as power and CS# are maintained-eliminating refresh overhead in MCU firmware and reducing system complexity.
What is the minimum Vcc required to retain data in R1LV5256ESA-7SR#B0 during standby?
The R1LV5256ESA-7SR#B0 guarantees data retention down to Vcc = 2.0V when CS# is held high, as specified in the Low Vcc Data Retention Characteristics table (page 12). At this voltage, retention current (ICCDR) remains ≤10μA up to +85°C, making it suitable for brown-out resilience in battery-backed systems.
Can R1LV5256ESA-7SR#B0 be used with a 5V microcontroller interface?
No-R1LV5256ESA-7SR#B0 is strictly a 2.7–3.6V device with TTL-compatible inputs (VIH ≥ 2.0V, VIL ≤ 0.6V), but its absolute maximum input voltage is Vcc + 0.3V (≤3.9V). Direct connection to 5V logic will exceed VIH limits and risk damage. A level translator or voltage divider is required for 5V host interfaces.
What package type does R1LV5256ESA-7SR#B0 use, and is it RoHS compliant?
R1LV5256ESA-7SR#B0 uses an 8mm × 13.4mm 28-pin plastic TSOP (normal-bend type), part number PTSA0028ZA-A. Per Renesas documentation and compliance statements in the datasheet colophon, the device meets EU RoHS Directive requirements and contains no restricted substances above threshold limits.
R1LV5256ESA-7SR#B0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Bulk
- 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-TSOP
R1LV5256ESA-7SR#B0 FAQ
1.How can I place an order for R1LV5256ESA-7SR#B0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LV5256ESA-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 R1LV5256ESA-7SR#B0 reliable?
The price and inventory of R1LV5256ESA-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 R1LV5256ESA-7SR#B0 is usually 5 days.
3.What payment methods are accepted for R1LV5256ESA-7SR#B0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LV5256ESA-7SR#B0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LV5256ESA-7SR#B0?
R1LV5256ESA-7SR#B0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LV5256ESA-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 R1LV5256ESA-7SR#B0?
For technical support, including R1LV5256ESA-7SR#B0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LV5256ESA-7SR#B0 requirements.
6.How does Aetrix verify that R1LV5256ESA-7SR#B0 is sourced from the original manufacturer or authorized distributors?
All R1LV5256ESA-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 R1LV5256ESA-7SR#B0 meets industry standards.
7.What is the process for return or replacement of R1LV5256ESA-7SR#B0?
All R1LV5256ESA-7SR#B0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LV5256ESA-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 R1LV5256ESA-7SR#B0 part is unused and in its original packaging.
Return procedure for R1LV5256ESA-7SR#B0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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