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Renesas R1LP5256ESP-5SR#B0
- Part No.:
- R1LP5256ESP-5SR#B0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-SOIC (0.330", 8.40mm Width)
- Datasheet:
-
R1LP5256ESP-5SR#B0.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,409
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Product details
Overview
R1LP5256ESP-5SR#B0 from Renesas Electronics is a 256Kb low-power static RAM organized as 32,768 × 8-bit, fabricated in 0.15µm CMOS/TFT process, operating from a single 4.5–5.5V supply with 55ns access time and 1µA typical standby current at 5.0V, used in battery-backed memory subsystems for industrial controllers and embedded instrumentation.
For engineers reviewing the R1LP5256ESP-5SR#B0 datasheet, R1LP5256ESP-5SR#B0 pinout, R1LP5256ESP-5SR#B0 application, or R1LP5256ESP-5SR#B0 equivalent, key selection criteria include TTL-compatible I/O timing, no-refresh operation, OR-tie capable three-state outputs, chip-select expandability, and 28-pin SOP packaging for legacy board compatibility.
Technical Context
The R1LP5256ESP-5SR#B0 implements a fully static memory architecture with asynchronous parallel interface, no internal clocks or refresh circuitry, and independent address/data bus control via CS#, WE#, and OE# signals. Its block diagram confirms direct connection between A0–A14 address inputs, DQ0–DQ7 bidirectional data lines, and Vcc/Vss power rails without auxiliary logic or voltage translation.
It supports two distinct operational modes: read (CS#=L, OE#=L, WE#=H) and write (CS#=L, WE#=L), with output disable (CS#=L, OE#=H) and high-Z standby (CS#=H) states. Timing parameters are specified over 0°C to +70°C ambient, with tAA = 55ns, tOE = 30ns, and tWC = 55ns under standard test conditions (Vcc = 4.5–5.5V, CL = 30pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256Kb (32,768 words × 8 bits) - provides byte-addressable storage for firmware buffers or real-time data logging in space-constrained designs. |
| Access Time | 55 ns - enables reliable interfacing with 12–15 MHz microcontrollers without wait states in standard 8-bit bus systems. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with legacy 5V TTL logic families and eliminates need for level-shifting circuitry. |
| Standby Current | 1 µA typical at 5.0V/25°C - supports multi-year battery backup in non-volatile memory retention mode (Vcc ≥ 2.0V). |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade industrial equipment, including programmable logic controllers and HMI panels. |
| I/O Interface | TTL-compatible inputs and three-state outputs - allows direct connection to 5V microcontroller data/address buses without external drivers. |
| Package Type | 28-pin SOP (450-mil, PRSP0028DB-B) - supports through-hole assembly and legacy PCB layouts requiring standard SOIC footprint. |
Pinout & Package
Package: 28-pin plastic SOP (450-mil width), JEDEC MS-012AC compliant, body size 17.9mm × 7.6mm, lead pitch 1.27mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply input | Primary 4.5–5.5V supply rail; decoupling capacitor required within 10mm for stable read/write operation. |
| Vss | Ground reference | System ground return path; must be connected to low-impedance PCB plane to minimize noise coupling into memory array. |
| A0–A14 | Address inputs | 15-bit address bus accepting 0x0000–0x7FFF range; all inputs TTL-compatible with VIH ≥ 2.2V and VIL ≤ 0.8V. |
| DQ0–DQ7 | Bidirectional data I/O | 8-bit common data bus; three-state controlled by CS# and OE#; supports OR-tie for memory expansion without external logic. |
| CS# | Chip select (active-low) | Enables device operation; when high, places outputs in high-impedance state and reduces ICC to 1µA typical. |
| WE# | Write enable (active-low) | Controls write cycle initiation; low with CS# low initiates write; high during CS# low enables read or output disable. |
| OE# | Output enable (active-low) | Controls DQ bus direction and output drive; prevents contention on shared data bus when multiple devices are present. |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Fully static architecture eliminates periodic refresh cycles, reducing CPU overhead and simplifying system timing design. |
| Low standby current | 1 µA typical at 5.0V/25°C enables >10-year data retention on coin-cell backup without external power management ICs. |
| TTL-compatible I/O | Direct interface with legacy 5V microcontrollers (e.g., 8051, PIC18F, AVR Mega) without level shifters or bus transceivers. |
| OR-tie capability | Three-state outputs allow multiple R1LP5256ESP-5SR#B0 devices to share a common data bus using wired-OR configuration. |
| Easy memory expansion | CS#-based chip selection supports daisy-chained or decoded addressing schemes for building larger memory banks up to 1Mb. |
Applications
| Industrial PLC Data Buffer | Medical Instrumentation Log Memory |
|---|---|
|
Use Scenario: Storing real-time sensor readings and alarm history in a DIN-rail mounted programmable logic controller with limited board space and no external refresh controller. IC Role / Device Role / Timing Role: Primary volatile data buffer providing fast, deterministic 55ns read/write access for cyclic I/O scanning and event logging. Use Value: Eliminates need for DRAM refresh circuitry and reduces BOM count while maintaining 32KB of fast-access memory for runtime diagnostics. |
Use Scenario: Capturing waveform snapshots and calibration coefficients in portable ECG monitors powered by primary lithium batteries. IC Role / Device Role / Timing Role: Battery-backed SRAM holding critical patient data during power transitions and sleep modes. Use Value: 1µA standby current extends battery life beyond 3 years; 2.0V minimum retention voltage ensures data integrity during brown-out events. |
| Automotive Diagnostic Tool Cache | Legacy Industrial HMI Display Buffer |
|
Use Scenario: Caching OBD-II protocol responses and vehicle parameter tables in handheld diagnostic scanners operating across automotive battery voltage ranges. IC Role / Device Role / Timing Role: Non-refreshing memory subsystem interfacing directly with 8-bit MCU bus for rapid query-response buffering. Use Value: 4.5–5.5V supply range accommodates unregulated 12V automotive systems with minimal filtering; 55ns access supports real-time CAN message correlation. |
Use Scenario: Holding GUI frame buffers and menu state variables in panel-mounted HMIs using aging 5V microcontroller platforms. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for obsolete 28-pin SRAMs in field-upgraded equipment. Use Value: 28-pin SOP package and TTL I/O ensure zero-layout change migration from legacy parts like HM62256 or IS61LV256AL. |
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 |
|---|---|---|---|
| IS61LV256AL-10TLI | 100ns access time, 3.3V-only supply (2.7–3.6V), 32-pin TSOP package | Requires level-shifting for 5V systems; suited for newer low-voltage designs with tighter power budgets | Select if migrating to 3.3V architecture and board redesign is acceptable; not pin-compatible with R1LP5256ESP-5SR#B0. |
| HM62256ALP-70 | 70ns access time, 5V-only supply (4.5–5.5V), 28-pin DIP/SOP, 2µA standby current | Near-identical interface and package but slower timing and higher leakage; legacy part with limited availability | Use only for exact form-fit replacement where 70ns timing is acceptable; verify long-term supply chain stability before design-in. |
Compared with IS61LV256AL-10TLI and HM62256ALP-70, the R1LP5256ESP-5SR#B0 delivers faster 55ns access at identical 5V operation and lowest standby current (1µA), making it optimal for battery-critical, timing-sensitive industrial upgrades where SOP footprint and TTL compatibility are mandatory.
Availability
R1LP5256ESP-5SR#B0 is available at Aetrix Electronics and suitable for industrial PLC data buffering, portable medical instrumentation logging, and automotive diagnostic tool caching requiring stable component supply and long-lifecycle support.
Supply support for R1LP5256ESP-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 R1LP5256E Series was designed specifically for low-power, no-refresh memory applications in battery-operated and legacy 5V embedded systems, emphasizing reliability, TTL compatibility, and long-term data retention.
FAQ
What is the maximum operating temperature range for R1LP5256ESP-5SR#B0?
The R1LP5256ESP-5SR#B0 is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade specification aligns with its intended use in industrial controllers, HMIs, and diagnostic tools deployed in non-automotive environments. The datasheet explicitly defines this range in the Ordering Information table and confirms it in DC Operating Conditions on page 5.
Does R1LP5256ESP-5SR#B0 require an external clock or refresh signal?
No, the R1LP5256ESP-5SR#B0 is a fully static RAM and requires no external clock or refresh signal. Its architecture uses bistable latching circuits that retain data indefinitely as long as power is applied. This eliminates CPU overhead and timing complexity associated with DRAM refresh cycles, as confirmed in the Features section on page 1 of the datasheet.
What package type does R1LP5256ESP-5SR#B0 use, and is it RoHS-compliant?
R1LP5256ESP-5SR#B0 uses a 28-pin plastic SOP (450-mil width, PRSP0028DB-B) package. While the 2011 datasheet does not explicitly state RoHS status, Renesas' corporate policy mandates RoHS compliance for all products shipped after July 1, 2006, and this part carries the #B0 suffix indicating standard commercial packaging consistent with RoHS directives.
Can R1LP5256ESP-5SR#B0 retain data at reduced supply voltage?
Yes, the R1LP5256ESP-5SR#B0 supports data retention down to Vcc = 2.0V, with typical retention current of 1µA at 25°C. This feature enables reliable battery-backup operation during main power loss, as detailed in the Low Vcc Data Retention Characteristics table on page 12 of the datasheet.
How many address and data pins does R1LP5256ESP-5SR#B0 have?
The R1LP5256ESP-5SR#B0 has 15 address pins (A0–A14) supporting 32,768 locations, and 8 bidirectional data pins (DQ0–DQ7). This matches its 32k × 8-bit organization and is verified in the Pin Description table (page 2), Block Diagram (page 3), and Operation Table (page 4) of the official datasheet.
R1LP5256ESP-5SR#B0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.330", 8.40mm 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:
- 55ns
- Access Time:
- 55 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-5SR#B0 FAQ
1.How can I place an order for R1LP5256ESP-5SR#B0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESP-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 R1LP5256ESP-5SR#B0 reliable?
The price and inventory of R1LP5256ESP-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 R1LP5256ESP-5SR#B0 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESP-5SR#B0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESP-5SR#B0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESP-5SR#B0?
R1LP5256ESP-5SR#B0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESP-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 R1LP5256ESP-5SR#B0?
For technical support, including R1LP5256ESP-5SR#B0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESP-5SR#B0 requirements.
6.How does Aetrix verify that R1LP5256ESP-5SR#B0 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESP-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 R1LP5256ESP-5SR#B0 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESP-5SR#B0?
All R1LP5256ESP-5SR#B0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESP-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 R1LP5256ESP-5SR#B0 part is unused and in its original packaging.
Return procedure for R1LP5256ESP-5SR#B0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LP5256ESP-5SR#B0 Tags
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