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Renesas R1LV5256ESP-5SR#B0
- Part No.:
- R1LV5256ESP-5SR#B0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-SOIC (0.330", 8.40mm Width)
- Datasheet:
-
R1LV5256ESP-5SR#B0.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,025
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Product details
Overview
R1LV5256ESP-5SR#B0 from Renesas Electronics is a 256Kb low-power static RAM (32k × 8-bit) in 28-pin SOP package, operating from 2.7V to 3.6V with 55 ns access time and 1 µA typical standby current at 3.0V. It features TTL-compatible I/O, no refresh requirement, and chip-select–based memory expansion-ideal for battery-backed instrumentation and portable embedded systems requiring deterministic timing and zero-refresh operation.
For engineers reviewing the R1LV5256ESP-5SR#B0 datasheet, R1LV5256ESP-5SR#B0 pinout, R1LV5256ESP-5SR#B0 application, or R1LV5256ESP-5SR#B0 equivalent, key selection criteria include its 55 ns read cycle time, 1 µA standby current at +25°C, 28-pin SOP mechanical compatibility, and support for OR-tie data bus configurations without external bus transceivers.
Technical Context
The R1LV5256ESP-5SR#B0 implements a fully static CMOS memory array with separate address, data, and control buffers. Its architecture eliminates internal clocks and refresh circuitry, enabling true zero-cycle maintenance during low-power sleep modes. The device uses standard asynchronous SRAM timing with independent CS#, WE#, and OE# controls.
All inputs meet TTL voltage thresholds (VIH ≥ 2.0 V, VIL ≤ 0.6 V), and outputs drive ±0.5 mA with VOH ≥ 2.4 V and VOL ≤ 0.4 V. Three-state outputs support direct bus sharing via OE#-controlled high-impedance state, while CS#-driven data retention mode allows VCC as low as 2.0 V with ICCDR ≤ 10 µA at +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32,768 words × 8 bits): supports byte-wide data paths without external multiplexing. |
| Access time | 55 ns max (tAA, tACS): guarantees deterministic read latency for real-time microcontroller interfaces. |
| Supply voltage | 2.7 V to 3.6 V: compatible with single-cell Li-ion or regulated 3.3 V rails without level shifting. |
| Standby current | 1 µA typical at 3.0 V / +25°C: enables multi-year battery life in always-on backup memory applications. |
| Data retention VCC | 2.0 V min: maintains stored data during brown-out or battery depletion down to critical threshold. |
| Operating temperature | 0°C to +70°C: qualified for commercial-grade industrial control panels and consumer electronics enclosures. |
| I/O interface | TTL-compatible inputs/outputs: interoperable with legacy 5 V logic families using pull-up resistors or direct 3.3 V MCU connections. |
Pinout & Package
Package: 450-mil 28-pin plastic SOP (PRSP0028DB-B). Lead-free, RoHS-compliant, surface-mountable with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | Primary 2.7–3.6 V supply rail; decoupling capacitor required within 10 mm of pin. |
| Vss | Ground | Digital ground reference; must be connected to system GND plane with low-inductance path. |
| A0–A14 | Address inputs | 15-bit address bus (32k word capacity); driven by MCU or FPGA address lines with <5 ns rise/fall time. |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus; three-state controlled by OE# and CS#; supports OR-tie bus sharing. |
| CS# | Chip select | Active-low enable; controls address/data buffers and enters data retention mode when high. |
| WE# | Write enable | Active-low write strobe; initiates write cycle when CS# is low and overlaps with valid address/data. |
| OE# | Output enable | Active-low output gate; places DQ pins in high-Z when high, preventing bus contention during read cycles. |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Eliminates periodic memory refresh overhead in MCU firmware and guarantees data integrity across power cycles. |
| Low-voltage data retention | Maintains stored contents at VCC ≥ 2.0 V with ICCDR ≤ 10 µA, enabling seamless backup during main supply failure. |
| OR-tie capable outputs | Three-state DQ pins allow multiple SRAMs to share a common data bus without external bus switches or transceivers. |
| TTL-compatible signaling | Direct interface with legacy 5 V microcontrollers and FPGAs using simple resistor-based level adaptation if needed. |
| Easy memory expansion | CS#-based chip selection enables straightforward banked memory architectures using address-line decoding. |
Applications
| Portable Medical Monitors | Industrial PLC Data Loggers |
|---|---|
|
Use Scenario: Battery-powered ECG or SpO₂ monitors storing waveform snapshots between wireless uploads. IC Role / Device Role / Timing Role: Nonvolatile buffer memory holding acquired sensor data during intermittent RF transmission windows. Use Value: 1 µA standby current extends single-charge battery life beyond 3 years; 55 ns access enables real-time display buffering without frame drops. |
Use Scenario: DIN-rail mounted controllers logging machine status, temperature, and fault codes over 24/7 operation. IC Role / Device Role / Timing Role: Primary working memory for cyclic data acquisition and timestamped event storage. Use Value: Zero-refresh operation prevents data corruption during brown-outs; 28-pin SOP simplifies PCB layout in space-constrained enclosures. |
| Smart Meter Firmware Cache | Automotive Diagnostic Tools |
|
Use Scenario: Electricity/water meters caching billing intervals and tamper events before secure upload to utility servers. IC Role / Device Role / Timing Role: Secure, low-power scratchpad memory retaining critical billing data during mains interruption. Use Value: Data retention down to 2.0 V ensures integrity through full battery discharge; TTL compatibility avoids level-shifter BOM cost. |
Use Scenario: Handheld OBD-II scanners capturing live CAN bus diagnostics and error codes during vehicle service. IC Role / Device Role / Timing Role: Temporary storage for decoded diagnostic messages prior to USB/Bluetooth transfer to technician tablet. Use Value: 55 ns read latency supports real-time protocol parsing; SOP package enables compact, drop-resistant tool housing design. |
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), 10 ns access, 3.3 V only, 44-pin TSOP | Higher bandwidth but wider bus and larger footprint; requires PCB redesign | Select only when 16-bit data path and faster timing outweigh board space and layout change costs. |
| AS6C4008-55ZIN | 2.7–3.6 V, 55 ns, 28-pin SOP, 1 µA standby-but rated –40°C to +85°C | Same pinout and timing, extended temp range; slightly higher ISB (2 µA typ) | Prefer for automotive or outdoor deployments where ambient exceeds +70°C; otherwise R1LV5256ESP-5SR#B0 offers lower standby current. |
Compared with IS61LV25616AL-10TLI and AS6C4008-55ZIN, the R1LV5256ESP-5SR#B0 delivers optimal balance of ultra-low standby current (1 µA), commercial-temp reliability, and drop-in 28-pin SOP compatibility-making it ideal for cost-sensitive, battery-constrained designs where 8-bit bus width suffices.
Availability
R1LV5256ESP-5SR#B0 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC data loggers, and smart meter firmware cache applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for R1LV5256ESP-5SR#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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.
The R1LV5256E Series was designed specifically for low-power, battery-operated memory applications demanding zero-refresh operation, wide supply tolerance, and robust data retention-targeting instrumentation, portable diagnostics, and energy metering systems.
FAQ
What is the maximum operating temperature range for the R1LV5256ESP-5SR#B0?
The R1LV5256ESP-5SR#B0 is specified 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, where the "R" suffix denotes the 0°C to +70°C temperature grade. It is not rated for extended industrial temperatures (–40°C to +85°C), which apply to variants like R1LV5256ESP-5SI#B0.
Does the R1LV5256ESP-5SR#B0 require an external clock or refresh signal?
No, the R1LV5256ESP-5SR#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 and CS# remain within specification-enabling ultra-low-power sleep modes in battery-backed systems without firmware intervention.
What is the minimum supply voltage at which the R1LV5256ESP-5SR#B0 retains data?
The R1LV5256ESP-5SR#B0 maintains stored data down to VCC = 2.0 V, as specified in the Low Vcc Data Retention Characteristics table (page 12). At this voltage, data retention current (ICCDR) remains ≤10 µA up to +85°C, and chip deselect-to-retention time (tCDR) is 0 ns-ensuring immediate entry into low-power retention upon supply sag.
Can the R1LV5256ESP-5SR#B0 be used with a 5 V microcontroller?
Yes-the R1LV5256ESP-5SR#B0 has TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.6 V) and outputs (VOH ≥ 2.4 V at –0.5 mA), allowing direct connection to 5 V logic families. For reliable interfacing, tie unused address lines high/low, use series resistors on DQ lines if driving 5 V inputs, and ensure VCC stays within 2.7–3.6 V.
What package type does the R1LV5256ESP-5SR#B0 use, and is it RoHS compliant?
The R1LV5256ESP-5SR#B0 uses a 450-mil 28-pin plastic SOP package (PRSP0028DB-B), as documented in the Ordering Information table (page 1). It is RoHS compliant and lead-free, meeting EU Directive 2011/65/EU requirements-confirmed in Renesas's environmental compliance documentation referenced on page 13 of the datasheet.
R1LV5256ESP-5SR#B0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.330", 8.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOP
R1LV5256ESP-5SR#B0 FAQ
1.How can I place an order for R1LV5256ESP-5SR#B0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LV5256ESP-5SR#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-5SR#B0 reliable?
The price and inventory of R1LV5256ESP-5SR#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-5SR#B0 is usually 5 days.
3.What payment methods are accepted for R1LV5256ESP-5SR#B0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LV5256ESP-5SR#B0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LV5256ESP-5SR#B0?
R1LV5256ESP-5SR#B0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LV5256ESP-5SR#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-5SR#B0?
For technical support, including R1LV5256ESP-5SR#B0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LV5256ESP-5SR#B0 requirements.
6.How does Aetrix verify that R1LV5256ESP-5SR#B0 is sourced from the original manufacturer or authorized distributors?
All R1LV5256ESP-5SR#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-5SR#B0 meets industry standards.
7.What is the process for return or replacement of R1LV5256ESP-5SR#B0?
All R1LV5256ESP-5SR#B0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LV5256ESP-5SR#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-5SR#B0 part is unused and in its original packaging.
Return procedure for R1LV5256ESP-5SR#B0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LV5256ESP-5SR#B0 Tags
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