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Renesas R1LP5256ESP-5SI#B0
- Part No.:
- R1LP5256ESP-5SI#B0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-SOIC (0.330", 8.40mm Width)
- Datasheet:
-
R1LP5256ESP-5SI#B0.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,914
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Product details
Overview
R1LP5256ESP-5SI#B0 from Renesas Electronics is a 256Kb low-power static RAM organized as 32,768 × 8-bit, operating on a single 4.5–5.5V supply with 55 ns access time, 0.6 µA typical standby current at 5.0V, and TTL-compatible I/O-designed for battery-backed memory systems in industrial controllers and portable instrumentation.
For engineers reviewing the R1LP5256ESP-5SI#B0 datasheet, R1LP5256ESP-5SI#B0 pinout, R1LP5256ESP-5SI#B0 application, or R1LP5256ESP-5SI#B0 equivalent, key selection criteria include no-refresh operation, OR-tie capable three-state outputs, CS#-controlled data retention down to 2.0V, and compatibility with legacy 28-pin SOP-based memory interfaces.
Technical Context
The R1LP5256ESP-5SI#B0 implements a fully static CMOS memory architecture with no internal clocks or refresh circuitry, relying on address decoding and control signal timing (CS#, WE#, OE#) to manage read/write cycles. Its block diagram confirms direct address-to-array mapping via row/column decoders and sense/write amplifiers without pipeline or cache layers.
It supports two distinct write modes-WE#-clocked and CS#-clocked-with defined setup/hold times (tAS = 0 ns, tDH = 0 ns) and overlap requirements (tDW = 25 ns). Data retention is activated by holding CS# high while reducing Vcc to ≥2.0V, drawing only 0.6 µA typical at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32k × 8), enabling byte-wide data access without external multiplexing |
| Access time | 55 ns max-guarantees timing compliance in 18 MHz bus systems with standard TTL propagation margins |
| Supply voltage | 4.5–5.5 V-supports direct interface with 5V logic families and tolerates ±10% rail variation |
| Standby current | 0.6 µA typical at 5.0V/25°C-enables multi-year battery backup in always-on monitoring nodes |
| Data retention Vcc | 2.0 V min-allows memory state preservation during brown-out or controlled power-down sequences |
| I/O compatibility | TTL input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (VOH ≥ 2.4 V @ –1 mA)-ensures plug-in replacement of legacy 28-pin SRAMs |
| Package | 28-pin SOP (450-mil width)-fits standard PCB footprints used in industrial control modules and test equipment |
Pinout & Package
Package: 28-pin plastic SOP (450-mil width), surface-mount, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | Primary 4.5–5.5V supply rail; decoupling capacitor required within 10 mm |
| Vss (GND) | Ground reference | Common return path for all I/O and internal logic; must be low-impedance plane |
| A0–A14 | Address inputs | 15-bit address bus accepting 0x0000–0x7FFF; latched on CS# assertion |
| DQ0–DQ7 | Bi-directional data I/O | 8-bit common bus with three-state control; supports OR-tie for shared-bus expansion |
| CS# | Chip select (active-low) | Enables memory access; high-Z mode when high; controls data retention entry |
| WE# | Write enable (active-low) | Initiates write cycle when CS# is low; timing-critical for tWP ≥ 40 ns |
| OE# | Output enable (active-low) | Gates DQ outputs to prevent bus contention; independent of CS#/WE# state |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Eliminates external refresh controller or timer circuitry-reduces BOM count and firmware overhead |
| Low standby current | 0.6 µA typical enables >10-year coin-cell backup in tamper-detection or real-time clock modules |
| OR-tie capable outputs | Allows multiple R1LP5256ESP-5SI#B0 devices to share a single data bus without external logic |
| CS#-controlled data retention | Automatically enters ultra-low-power retention mode when CS# is high and Vcc ≥ 2.0V |
| TTL-compatible I/O | Direct connection to 5V microcontrollers, FPGAs, and ASICs without level-shifting components |
Applications
| Industrial PLC Memory Buffer | Portable Medical Instrument Data Log |
|---|---|
Use Scenario: Stores configuration parameters and short-term process history in programmable logic controllers with intermittent power loss. IC Role / Device Role / Timing Role: Non-volatile buffer holding critical state data during mains interruption, using CS#-triggered retention. Use Value: 0.6 µA standby draw extends backup battery life beyond 5 years; 55 ns access supports scan-cycle updates at 10 kHz. | Use Scenario: Captures sensor waveforms (ECG, SpO₂) in handheld diagnostic tools powered by AA batteries. IC Role / Device Role / Timing Role: High-speed scratchpad memory buffering raw ADC samples before compression and transmission. Use Value: TTL-compatible DQ lines interface directly to 8-bit microcontroller ports; no-refresh operation avoids timing jitter in sample capture. |
| Legacy Industrial HMI Display Cache | Test Equipment Firmware Patch Storage |
Use Scenario: Holds GUI bitmap tiles and menu structures in panel-mounted HMIs where firmware upgrades are infrequent. IC Role / Device Role / Timing Role: Static frame buffer accessed via parallel bus from display controller ASIC. Use Value: 28-pin SOP footprint matches obsolete SRAMs (e.g., IS61LV256AL); 55 ns access meets 60 Hz refresh timing. | Use Scenario: Stores field-upgradable firmware patches in automated test systems requiring zero-downtime updates. IC Role / Device Role / Timing Role: Dual-port accessible memory bank allowing background patch load while main CPU executes current firmware. Use Value: Three-state DQ outputs enable safe hot-swap of patch data without bus contention; CS# isolation prevents corruption during update. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS61LV256AL-10TLI | 10 ns faster access (45 ns), higher ICC1 (45 mA typ), same 28-pin TSOP/SOP package | Targeted at high-speed embedded controllers; less optimized for ultra-low-power retention | Select when system clock >22 MHz requires tighter timing margins; verify Vcc stability for increased dynamic current |
| AS6C4008-55PCN | Same 55 ns speed, but 2.0–5.5V wide supply range and 1 µA standby (typ), 32-pin SOP | Designed for mixed-voltage systems; larger package requires PCB redesign | Choose for designs needing 3.3V/5V dual-rail support or extended temperature range (–40°C to +105°C) |
Compared with IS61LV256AL-10TLI and AS6C4008-55PCN, the R1LP5256ESP-5SI#B0 delivers superior battery-backed retention efficiency (0.6 µA vs. ≥1 µA) in a drop-in 28-pin SOP footprint, making it optimal for cost-sensitive, long-life industrial memory applications where 55 ns latency is acceptable.
Availability
R1LP5256ESP-5SI#B0 is available at Aetrix Electronics and suitable for industrial PLC memory buffers, portable medical instrument data logging, and legacy HMI display caching requiring stable component supply across extended product lifecycles.
Supply support for R1LP5256ESP-5SI#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 IoT applications.
The R1LP5256E Series was developed specifically for low-power, no-refresh memory applications in battery-operated and safety-critical industrial systems-emphasizing reliability, data retention, and legacy interface compatibility.
FAQ
What is the maximum operating temperature range for the R1LP5256ESP-5SI#B0?
The R1LP5256ESP-5SI#B0 is rated for continuous operation from –40°C to +85°C ambient temperature, validated per its DC and AC characteristics tables. This range covers most industrial control enclosures and portable medical devices without forced cooling. The device maintains full functionality-including 55 ns access time and 0.6 µA standby current-across this entire span, with derating applied only to absolute maximum ratings like storage temperature.
Does the R1LP5256ESP-5SI#B0 require an external clock or refresh signal?
No, the R1LP5256ESP-5SI#B0 is a fully static RAM with no internal clock or refresh circuitry. It retains data indefinitely as long as power is applied and CS# is held low during active use. When CS# is high and Vcc remains ≥2.0V, it enters data retention mode drawing only 0.6 µA typical-eliminating the need for refresh timers, clock generators, or associated firmware overhead in the R1LP5256ESP-5SI#B0 implementation.
Can the R1LP5256ESP-5SI#B0 be used in a 3.3V system?
No, the R1LP5256ESP-5SI#B0 requires a minimum Vcc of 4.5V and is not specified for 3.3V operation. Its TTL-compatible inputs demand VIH ≥ 2.2V and VIL ≤ 0.8V, but the core memory array and I/O drivers are designed for 4.5–5.5V. Using it below 4.5V risks data corruption, timing violations, or failure to enter retention mode. For 3.3V systems, consider alternatives like AS6C4008-55PCN instead of the R1LP5256ESP-5SI#B0.
What does "#B0" signify in the R1LP5256ESP-5SI#B0 part number?
The "#B0" suffix in R1LP5256ESP-5SI#B0 indicates the assembly revision code, where "B" denotes the manufacturing site and "0" is the initial revision level per Renesas's ordering nomenclature. It does not affect electrical specifications, timing, or packaging-it identifies traceability and process batch. All R1LP5256ESP-5SI#B0 units share identical functional behavior, AC/DC parameters, and pinout as defined in Rev.2.00 of the R10DS0268EJ0200 datasheet.
How does the R1LP5256ESP-5SI#B0 handle bus contention during read/write transitions?
The R1LP5256ESP-5SI#B0 prevents bus contention using independent OE# (output enable) and CS# (chip select) controls. OE# can disable DQ outputs while CS# remains active, and CS# alone forces all I/O into high-impedance state regardless of OE#/WE# status. Timing parameters tOHZ (0–20 ns) and tCHZ (0–20 ns) guarantee fast, predictable release from bus drive-critical when sharing DQ lines across multiple R1LP5256ESP-5SI#B0 devices or with other peripherals.
R1LP5256ESP-5SI#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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOP
R1LP5256ESP-5SI#B0 FAQ
1.How can I place an order for R1LP5256ESP-5SI#B0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESP-5SI#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-5SI#B0 reliable?
The price and inventory of R1LP5256ESP-5SI#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-5SI#B0 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESP-5SI#B0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESP-5SI#B0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESP-5SI#B0?
R1LP5256ESP-5SI#B0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESP-5SI#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-5SI#B0?
For technical support, including R1LP5256ESP-5SI#B0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESP-5SI#B0 requirements.
6.How does Aetrix verify that R1LP5256ESP-5SI#B0 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESP-5SI#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-5SI#B0 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESP-5SI#B0?
All R1LP5256ESP-5SI#B0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESP-5SI#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-5SI#B0 part is unused and in its original packaging.
Return procedure for R1LP5256ESP-5SI#B0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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