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Renesas R1LV5256ESA-7SI#S0
- Part No.:
- R1LV5256ESA-7SI#S0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
R1LV5256ESA-7SI#S0.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
R1LV5256ESA-7SI#S0 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, -40°C to +85°C industrial temperature range, and packaged in 28-pin TSOP (PTSA0028ZA-A). It serves as non-volatile backup memory in battery-powered instrumentation and embedded control systems requiring zero-refresh operation and TTL-compatible interfacing.
For engineers reviewing the R1LV5256ESA-7SI#S0 datasheet, R1LV5256ESA-7SI#S0 pinout, R1LV5256ESA-7SI#S0 application, or R1LV5256ESA-7SI#S0 equivalent, key selection criteria include standby current ≤10µA at +85°C, no-clock/no-refresh architecture, chip-select–based memory expansion capability, and compatibility with 3.3V microcontroller buses in space-constrained industrial modules.
Technical Context
The R1LV5256ESA-7SI#S0 implements a fully static CMOS memory array with independent address, data, and control buffers-no internal clocks or refresh circuitry required. Its three-state bidirectional DQ0–DQ7 I/Os support OR-tie bus configurations, while CS#, WE#, and OE# enable precise cycle control for read, write, and output disable operations.
Designed for low-voltage battery backup, it supports data retention down to VCC = 2.0V with ICCDR ≤10µA at +85°C and tCDR = 0ns chip-deselect-to-retention transition. All DC inputs meet TTL voltage thresholds (VIH ≥ 2.0V, VIL ≤ 0.6V), ensuring interoperability with legacy 3.3V logic families without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256Kb (32,768 × 8-bit) - supports byte-wide data paths without external multiplexing |
| Access time | 70ns max - enables reliable interface with 10–14 MHz microcontrollers using standard timing margins |
| Supply voltage | 2.7–3.6V - compatible with regulated 3.3V rails and brown-out tolerant in battery-backed systems |
| Standby current | ≤10µA at +85°C - extends battery life in always-on monitoring devices for >10 years |
| Data retention VCC | 2.0–3.6V - maintains stored contents during deep sleep or main power loss without external capacitor hold-up |
| Operating temperature | -40°C to +85°C - qualified for industrial-grade deployment in factory automation and outdoor telemetry |
| Input/Output compatibility | TTL-level - eliminates need for voltage translators when interfacing with legacy MCU GPIOs |
Pinout & Package
Package: 28-pin TSOP (normal-bend type), 8mm × 13.4mm footprint (PTSA0028ZA-A), surface-mount, embossed tape reel (1000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | Primary 2.7–3.6V supply rail; decoupling capacitor required within 10mm for noise immunity |
| Vss | Ground | Digital ground reference; must be connected to system GND plane with low-inductance path |
| A0–A14 | Address input | 15-bit address bus supporting full 32k-word addressing; no latching required |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus with three-state outputs; supports shared bus topology via OE# control |
| CS# | Chip select | Active-low enable; controls all internal buffers and initiates data retention mode when high |
| WE# | Write enable | Active-low write strobe; combined with CS# to define write cycle boundaries per JEDEC timing |
| OE# | Output enable | Active-low output gate; prevents bus contention during multi-device sharing or CPU wait states |
Key Features
| Feature | Design Value |
|---|---|
| No clock, no refresh | Eliminates timing-critical clock distribution and periodic refresh overhead in MCU firmware |
| Low standby current | 1µA typical at 3.0V/25°C enables decade-scale battery backup in portable meters and sensors |
| Easy memory expansion | CS#-based chip selection allows daisy-chained or parallel expansion up to 512KB without glue logic |
| OR-tie capability | Three-state outputs permit wired-OR bus architectures for interrupt aggregation or status polling |
| TTL-compatible I/O | Direct connection to 3.3V microcontrollers (e.g., Renesas RL78, RA series) without level shifters |
Applications
| Industrial Data Logger | Medical Patient Monitor |
|---|---|
|
Use Scenario: Continuous acquisition of ECG, SpO₂, and temperature data during power interruption. IC Role / Device Role / Timing Role: Non-volatile buffer storing 30+ seconds of waveform data during AC failure or battery switchover. Use Value: Maintains data integrity with ≤10µA retention current at +85°C and zero-latency restore upon VCC recovery. |
Use Scenario: Real-time storage of calibration coefficients and alarm history in portable diagnostic equipment. IC Role / Device Role / Timing Role: Static configuration memory accessed only at boot or user-initiated recalibration. Use Value: Eliminates EEPROM wear-out concerns and reduces BOM count by replacing serial flash + backup capacitor. |
| Smart Meter Communication Module | Factory Automation PLC I/O Expander |
|
Use Scenario: Storing last-read utility meter values and communication logs during RF module sleep cycles. IC Role / Device Role / Timing Role: Low-power shadow RAM holding critical billing data between GPRS transmission bursts. Use Value: 70ns access time ensures fast readout before RF wake-up timeout; 2.7V minimum VCC supports wide-input DC-DC converters. |
Use Scenario: Local buffering of sensor input states and actuator command queues in distributed I/O nodes. IC Role / Device Role / Timing Role: Fast-access scratchpad memory for deterministic cyclic data exchange with main controller. Use Value: CS#-controlled enable/disable synchronizes memory access with fieldbus cycle timing, avoiding bus arbitration delays. |
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 active current (45mA typ) | Select when 16-bit data path and faster timing outweigh board area and power constraints |
| AS6C4008-70ZIN | 8-bit bus, 70ns access, 2.7–3.6V, 28-pin SOJ (not TSOP), 1µA standby at 25°C | Same speed and voltage but different package (SOJ vs TSOP); not pin-compatible | Choose only if SOJ mounting is acceptable and thermal profile permits same industrial temp range |
Compared with R1LV5256ESA-7SI#S0, IS61LV25616AL-10TLI delivers higher throughput at cost of layout area and quiescent power, while AS6C4008-70ZIN matches electrical specs but requires PCB redesign due to SOJ lead form and incompatible pinout.
Availability
R1LV5256ESA-7SI#S0 is available at Aetrix Electronics and suitable for industrial data loggers, medical patient monitors, smart meter communication modules, and factory automation PLC I/O expanders requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for R1LV5256ESA-7SI#S0 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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and enterprise applications.
The R1LV5256E Series was designed specifically for low-power, battery-backed memory applications where simplicity, reliability, and long-term data retention outweigh density or speed requirements.
FAQ
What is the maximum operating temperature specification for R1LV5256ESA-7SI#S0?
The R1LV5256ESA-7SI#S0 is rated for industrial temperature operation from -40°C to +85°C. This is confirmed in the Ordering Information table on page 1 of the R10DS0068EJ0100 datasheet, where the "I" suffix denotes the -40°C to +85°C range, and the "SI" variant explicitly maps to this grade. The device meets all DC and AC specifications across this full range.
Does R1LV5256ESA-7SI#S0 require an external clock signal to operate?
No, the R1LV5256ESA-7SI#S0 is a fully static RAM and requires no external clock. As stated in the Features section on page 1, it operates with "No clocks, No refresh." All timing is controlled solely by the asynchronous assertion of CS#, WE#, and OE# signals, making it ideal for simple microcontroller interfaces without clock domain management.
What is the minimum supply voltage at which R1LV5256ESA-7SI#S0 retains stored data?
The R1LV5256ESA-7SI#S0 guarantees data retention down to VCC = 2.0V, as specified in the "Low Vcc Data Retention Characteristics" table on page 12. At this voltage, with CS# held high and ambient temperature ≤+85°C, the device draws ≤10µA and maintains memory contents indefinitely-critical for battery-failover scenarios in industrial systems.
Is R1LV5256ESA-7SI#S0 pin-compatible with other variants in the R1LV5256E Series?
Yes, all R1LV5256E Series parts-including R1LV5256ESA-7SI#S0-share identical 28-pin TSOP pinouts per the Pin Arrangement diagram on page 2. The "ESA" prefix denotes TSOP packaging, and the pin functions (A0–A14, DQ0–DQ7, CS#, WE#, OE#, Vcc, Vss) are fixed across speed grades (-5S/-7S) and temperature versions (-SR/-SI), enabling drop-in replacement within the same package type.
What is the purpose of the OE# pin on R1LV5256ESA-7SI#S0?
The OE# (Output Enable) pin on R1LV5256ESA-7SI#S0 is an active-low control that places the DQ0–DQ7 data lines in high-impedance state when deasserted (OE# = high), preventing bus contention during multi-device sharing. As shown in the Operation Table on page 4, OE# must be low during read cycles to enable valid output; its timing (tOE ≤35ns) directly determines data valid window relative to address and CS# transitions.
R1LV5256ESA-7SI#S0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Bulk
- 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:
- 70ns
- Access Time:
- 70 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
R1LV5256ESA-7SI#S0 FAQ
1.How can I place an order for R1LV5256ESA-7SI#S0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LV5256ESA-7SI#S0 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-7SI#S0 reliable?
The price and inventory of R1LV5256ESA-7SI#S0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1LV5256ESA-7SI#S0 is usually 5 days.
3.What payment methods are accepted for R1LV5256ESA-7SI#S0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LV5256ESA-7SI#S0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LV5256ESA-7SI#S0?
R1LV5256ESA-7SI#S0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LV5256ESA-7SI#S0 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-7SI#S0?
For technical support, including R1LV5256ESA-7SI#S0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LV5256ESA-7SI#S0 requirements.
6.How does Aetrix verify that R1LV5256ESA-7SI#S0 is sourced from the original manufacturer or authorized distributors?
All R1LV5256ESA-7SI#S0 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-7SI#S0 meets industry standards.
7.What is the process for return or replacement of R1LV5256ESA-7SI#S0?
All R1LV5256ESA-7SI#S0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LV5256ESA-7SI#S0, 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-7SI#S0 part is unused and in its original packaging.
Return procedure for R1LV5256ESA-7SI#S0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LV5256ESA-7SI#S0 Tags
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