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Renesas R1LP5256ESP-7SR#B0
- Part No.:
- R1LP5256ESP-7SR#B0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-SOIC (0.330", 8.40mm Width)
- Datasheet:
-
R1LP5256ESP-7SR#B0.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,132
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Product details
Overview
R1LP5256ESP-7SR#B0 from Renesas Electronics is a 256Kb low-power static RAM (32k × 8-bit) in 450-mil 28-pin SOP package, operating on single 4.5–5.5V supply with 70 ns access time and 1 µA typical standby current at 5.0V. It supports TTL-compatible interfacing, no refresh, and battery backup operation - used in embedded controllers requiring nonvolatile memory retention during power loss.
For engineers reviewing the R1LP5256ESP-7SR#B0 datasheet, R1LP5256ESP-7SR#B0 pinout, R1LP5256ESP-7SR#B0 application, or R1LP5256ESP-7SR#B0 equivalent, key selection criteria include access time (70 ns), standby current (≤3 µA over full temperature range), TSOP/SOP package compatibility, and CS#/OE#/WE# control logic for seamless integration into legacy 8-bit microcontroller memory buses.
Technical Context
This SRAM implements asynchronous parallel interface architecture with three-state bidirectional DQ0–DQ7 I/Os, chip-select (CS#) and output-enable (OE#) controlled high-impedance states, and write-enable (WE#) driven byte-write timing. Address decoding covers A0–A14 (15-bit), enabling full 32k-word addressing without external address latching.
It uses Renesas' 0.15 µm CMOS process to achieve low ICC1 (35 mA max) during active read/write cycles and ultra-low ISB (≤10 µA at +85°C) in standby - critical for battery-backed systems. Data retention is guaranteed down to VCC = 2.0 V with tCDR = 0 ns and tR = 5 ms recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8-bit) - supports 8-bit data bus without multiplexing or external byte masking. |
| Access Time | 70 ns - ensures compatibility with 12 MHz Z80, 8051, and similar legacy microcontrollers' memory wait-state requirements. |
| Supply Voltage | 4.5 V to 5.5 V - operates across standard 5V TTL/CMOS logic rails without regulation overhead. |
| Standby Current | 1 µA typical at 5.0V/25°C; ≤10 µA at +85°C - enables multi-year battery backup in real-time clock or configuration memory applications. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade industrial control panels and instrumentation enclosures without forced cooling. |
| Input/Output Compatibility | TTL-compatible VIH ≥ 2.2 V, VIL ≤ 0.8 V - interfaces directly with 74LS, 74HC, and microcontroller GPIO without level-shifting. |
| Data Retention Voltage | 2.0 V minimum - retains stored data during brown-out or backup battery discharge down to 2.0 V without corruption. |
Pinout & Package
Package: 450-mil 28-pin plastic SOP (PRSP0028DB-B / 28P2W-C). Lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | +4.5V to +5.5V main supply rail; decoupling capacitor required within 10 mm. |
| Vss | Ground | System reference ground; must be low-impedance connection shared with controller logic ground. |
| A0–A14 | Address inputs | 15-bit unidirectional address bus; fully decoded internally - no external address latch needed. |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus with three-state outputs; OR-tie capable for memory expansion. |
| CS# | Chip select | Active-low enable; places device in standby (high-Z) when high; controls data retention mode when asserted during low-Vcc. |
| WE# | Write enable | Active-low write strobe; initiates write cycle when CS# and WE# both low; defines write pulse width (50 ns min). |
| OE# | Output enable | Active-low output control; prevents bus contention during read; high disables outputs to high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | True static RAM architecture eliminates DRAM-style refresh circuitry, reducing MCU firmware overhead and system complexity. |
| Low standby current | 1 µA typical at 5.0V/25°C enables >10-year coin-cell battery life in backup memory applications. |
| TTL-compatible I/O | Direct interface with legacy 5V microcontrollers (e.g., 8051, PIC18F, Z8) without level translators or pull-up resistors. |
| Easy memory expansion | CS#-based chip select allows daisy-chained or decoded multi-chip configurations using standard address decoding logic. |
| Common data I/O | Single 8-bit bidirectional bus reduces PCB trace count and simplifies routing versus separate input/output pins. |
Applications
| Industrial PLC Data Buffer | Medical Device Configuration Storage |
|---|---|
Use Scenario: Storing runtime I/O mapping and calibration tables in programmable logic controllers during power interruption. IC Role / Device Role / Timing Role: Nonvolatile shadow RAM holding volatile configuration data; retains values during AC dropout via backup battery. Use Value: Enables seamless resumption of control sequences after brown-out without reinitialization or host reprogramming. |
Use Scenario: Holding user-adjusted therapy parameters and device ID in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Battery-backed parameter store interfaced to 8-bit MCU via parallel bus; accessed only during setup or fault recovery. Use Value: Guarantees regulatory-compliant data persistence (IEC 62304 Class B) under 2.0 V VCC with zero data loss risk. |
| Automotive Body Control Module | Point-of-Sale Terminal Memory Expansion |
Use Scenario: Caching door lock status, mirror position, and lighting presets in BCMs where EEPROM endurance is insufficient. IC Role / Device Role / Timing Role: High-endurance, fast-access scratchpad memory mapped into MCU's external memory space. Use Value: Supports >1 million write cycles per location (vs. EEPROM's 100k), eliminating wear-leveling firmware overhead. |
Use Scenario: Extending RAM capacity for receipt buffering and transaction queueing in thermal receipt printers with 8-bit controllers. IC Role / Device Role / Timing Role: Parallel SRAM acting as FIFO buffer between printer engine and host UART interface. Use Value: 70 ns access time sustains 10 kB/s print throughput without CPU polling delays or interrupt latency bottlenecks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power parallel 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 | Requires bus-width adaptation and voltage translation; unsuitable for direct 8-bit 5V systems. | Select only if migrating to 3.3V design with wider data path and higher speed. |
| AS6C4008-70PCN | Same 8-bit/256K format, 70 ns, 5V, 28-pin SOP - but 5 µA typical ISB (5× higher than R1LP5256ESP-7SR#B0) | Higher standby current limits battery life in always-on backup applications. | Acceptable for mains-powered systems where ultra-low ISB is not critical. |
Compared with IS61LV25616AL-10TLI and AS6C4008-70PCN, the R1LP5256ESP-7SR#B0 uniquely balances 5V TTL compatibility, 70 ns timing, and sub-µA standby current in a drop-in 28-pin SOP footprint - making it optimal for cost-sensitive, battery-backed 8-bit embedded designs where layout reuse and power budget are primary constraints.
Availability
R1LP5256ESP-7SR#B0 is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostics equipment, and automotive body electronics requiring stable component supply across extended product lifecycles.
Supply support for R1LP5256ESP-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and memory solutions for industrial, automotive, and infrastructure markets.
The R1LP5256E Series was designed specifically for low-voltage, low-power static RAM applications in battery-operated and backup-memory systems - emphasizing data retention integrity, TTL interoperability, and long-term supply stability.
FAQ
What is the maximum operating temperature range for R1LP5256ESP-7SR#B0?
The R1LP5256ESP-7SR#B0 is rated for 0°C to +70°C ambient operation. This commercial-grade temperature range is specified in the ordering information table and confirmed in the DC Operating Conditions section (page 5) of the R10DS0070EJ0100 datasheet. It is not qualified for industrial (-40°C to +85°C) operation - that variant is designated by the "I" suffix (e.g., R1LP5256ESP-7SI#B0).
Does R1LP5256ESP-7SR#B0 require a refresh circuit?
No, the R1LP5256ESP-7SR#B0 is a true static RAM (SRAM) and does not require any refresh cycles. Its internal six-transistor memory cell design maintains data indefinitely as long as power is applied and CS# remains asserted. This eliminates timing-critical refresh overhead in MCU firmware and simplifies system design versus DRAM solutions.
What is the minimum supply voltage for data retention on R1LP5256ESP-7SR#B0?
The R1LP5256ESP-7SR#B0 guarantees data retention down to VCC = 2.0 V, as specified in the Low Vcc Data Retention Characteristics table (page 12) of the datasheet. At this voltage, with CS# held high (≥ Vcc − 0.2 V), the device draws ≤10 µA and retains stored data without corruption - essential for battery backup scenarios.
Can R1LP5256ESP-7SR#B0 be used with a 3.3V microcontroller?
No - the R1LP5256ESP-7SR#B0 is strictly a 5V-only device with VIH minimum of 2.2 V and VIL maximum of 0.8 V, but its VCC range is fixed at 4.5–5.5 V. Driving its inputs from a 3.3V MCU violates the absolute maximum input voltage rating (VIH ≤ Vcc + 0.3 V) and risks damage. A level translator or 5V-compatible controller is required.
What package type is used for R1LP5256ESP-7SR#B0?
The R1LP5256ESP-7SR#B0 uses a 450-mil 28-pin plastic SOP (Small Outline Package), identified in the datasheet as PRSP0028DB-B (28P2W-C). This surface-mount package has gull-wing leads, 1.27 mm pitch, and is RoHS-compliant - distinct from the TSOP variant (R1LP5256ESA-7SR#B0) which uses PTSA0028ZA-A (28P2C-A).
R1LP5256ESP-7SR#B0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.330", 8.40mm Width)
- Packaging:
- Tray
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOP
R1LP5256ESP-7SR#B0 FAQ
1.How can I place an order for R1LP5256ESP-7SR#B0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESP-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 R1LP5256ESP-7SR#B0 reliable?
The price and inventory of R1LP5256ESP-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 R1LP5256ESP-7SR#B0 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESP-7SR#B0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESP-7SR#B0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESP-7SR#B0?
R1LP5256ESP-7SR#B0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESP-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 R1LP5256ESP-7SR#B0?
For technical support, including R1LP5256ESP-7SR#B0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESP-7SR#B0 requirements.
6.How does Aetrix verify that R1LP5256ESP-7SR#B0 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESP-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 R1LP5256ESP-7SR#B0 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESP-7SR#B0?
All R1LP5256ESP-7SR#B0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESP-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 R1LP5256ESP-7SR#B0 part is unused and in its original packaging.
Return procedure for R1LP5256ESP-7SR#B0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LP5256ESP-7SR#B0 Tags
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