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Renesas R1LP5256ESA-5SR#B0
- Part No.:
- R1LP5256ESA-5SR#B0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
R1LP5256ESA-5SR#B0.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:25,686
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Product details
Overview
R1LP5256ESA-5SR#B0 from Renesas Electronics is a 256Kb low-power static RAM organized as 32,768 × 8-bit, operating on a single 4.5V–5.5V supply with 55 ns access time and 1 µA typical standby current at 5.0V. It features TTL-compatible I/O, no refresh requirement, and three-state outputs for bus sharing-designed for battery-backed memory systems in industrial controllers and portable instrumentation.
For engineers reviewing the R1LP5256ESA-5SR#B0 datasheet, R1LP5256ESA-5SR#B0 pinout, R1LP5256ESA-5SR#B0 application, or R1LP5256ESA-5SR#B0 equivalent, key selection criteria include its TSOP-28 package, -40°C to +85°C industrial temperature grade, 30 ns output enable timing (tOE), and compatibility with legacy 8-bit parallel memory interfaces requiring zero-refresh operation and ultra-low standby power.
Technical Context
This device implements a fully static CMOS SRAM architecture with independent address, data, and control buffers-no internal clocks or dynamic timing constraints. Its memory array uses a 32k-word × 8-bit organization with row/column decoding and sense/write amplifiers optimized for low-voltage operation and fast random-access reads/writes.
Control logic supports chip-select–driven standby mode (ISB ≤ 3 µA), OE#–gated output tri-state, and WE#–controlled write latching without external timing strobes. All inputs meet TTL voltage thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V), enabling direct interfacing with legacy microcontrollers and FPGAs without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32,768 × 8-bit) - supports byte-wide data buses without external multiplexing |
| Access time | 55 ns - enables operation with 12–15 MHz microcontroller bus cycles |
| Supply voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerant of ±10% regulation variation |
| Standby current | 1 µA typical at 5.0 V / 25°C - sustains data retention for years on coin-cell backup power |
| Operating temperature | -40°C to +85°C - qualified for industrial environments including factory automation and outdoor telemetry |
| Output enable delay | tOE = 30 ns max - ensures valid data within one clock cycle after OE# assertion in synchronous read protocols |
| Package | 28-pin TSOP (PTSA0028ZA-A, 8 mm × 13.4 mm) - surface-mount compatible with high-density PCB layouts |
Pinout & Package
Package: 28-pin plastic TSOP (normal-bend type), 8 mm × 13.4 mm footprint (JEDEC PTSA0028ZA-A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | +4.5 V to +5.5 V main supply rail for core and I/O circuitry |
| Vss | Ground | Reference return path for all signals and internal logic |
| A0–A14 | Address input | 15-bit address bus supporting full 32k-word addressing (215 = 32,768) |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus with three-state output drivers for shared bus topology |
| CS# | Chip select | Active-low enable controlling device activation and standby entry (ISB ≤ 3 µA when high) |
| WE# | Write enable | Active-low signal initiating write cycles; latches DQ inputs on falling edge |
| OE# | Output enable | Active-low control for output buffer; prevents bus contention during multi-device reads |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Eliminates external refresh circuitry and timing overhead-ideal for simple microcontroller-based systems |
| TTL-compatible I/O | Direct interface with legacy 5 V logic families (e.g., 8051, Z80, CPLDs) without level shifters |
| OR-tie capability | Three-state outputs allow multiple R1LP5256ESA-5SR#B0 devices to share a common data bus without external logic |
| Low-voltage data retention | Maintains stored data down to Vcc = 2.0 V-enables seamless transition to battery backup without data loss |
| Easy memory expansion | CS#-based chip selection simplifies adding multiple R1LP5256ESA-5SR#B0 devices for larger memory maps |
Applications
| Industrial PLC Data Buffer | Portable Medical Instrument Memory |
|---|---|
|
Use Scenario: Storing real-time sensor logs and configuration parameters in programmable logic controllers deployed in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile data buffer providing fast random-access storage for firmware variables and event history, operating continuously under 5 V supply with periodic battery backup. Use Value: 55 ns access time enables sub-microsecond register updates; 1 µA standby current extends coin-cell life to >5 years during power-loss events. |
Use Scenario: Holding calibration coefficients and patient measurement history in handheld ECG monitors powered by rechargeable Li-ion batteries. IC Role / Device Role / Timing Role: Primary working memory for embedded ARM Cortex-M0+ MCU, retaining critical data during sleep modes and brown-out conditions. Use Value: Data retention down to 2.0 V ensures uninterrupted storage during battery voltage sag; TSOP-28 footprint minimizes board area in compact medical enclosures. |
| Automotive Diagnostic Tool Cache | Legacy Industrial HMI Display Buffer |
|
Use Scenario: Caching OBD-II protocol response tables and fault-code definitions in vehicle diagnostic scanners used across varying under-hood temperatures. IC Role / Device Role / Timing Role: Static RAM serving as lookup table cache for rapid translation of CAN message IDs to human-readable diagnostics. Use Value: -40°C to +85°C rating guarantees reliable operation in parked vehicles exposed to desert heat or winter cold; no refresh simplifies firmware design. |
Use Scenario: Supporting character and bitmap rendering in panel-mounted HMIs using aging 8-bit microcontrollers with parallel memory buses. IC Role / Device Role / Timing Role: Byte-addressable frame buffer for monochrome LCD displays, accessed via dedicated memory-mapped I/O space. Use Value: TTL-compatible signaling eliminates glue logic; 28-pin TSOP allows drop-in replacement of obsolete 27C256 EPROMs in field-upgraded equipment. |
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 |
|---|---|---|---|
| AS6C4008-55PCN | 55 ns access, 256K × 8-bit, 2.7–5.5 V supply, SOIC-28 package | Wider voltage range enables single-supply operation with 3.3 V systems; higher ISB (5 µA typ) | Choose for mixed-voltage designs where 3.3 V compatibility outweighs standby current penalty |
| IS61LV25616AL-10TLI | 10 ns access, 256K × 16-bit, 3.3 V only, 44-pin TSOP | Double data width and faster speed but requires PCB redesign and 3.3 V infrastructure | Choose only when bandwidth demand exceeds 8-bit/55 ns capability and layout revision is feasible |
Compared with AS6C4008-55PCN, R1LP5256ESA-5SR#B0 offers lower standby current and guaranteed 5 V operation; compared with IS61LV25616AL-10TLI, it avoids costly 16-bit bus upgrades and maintains compatibility with legacy 5 V controller designs.
Availability
R1LP5256ESA-5SR#B0 is available at Aetrix Electronics and suitable for industrial automation, portable medical instrumentation, and automotive diagnostic tools requiring stable component supply, long-lifecycle support, and guaranteed TSOP-28 packaging.
Supply support for R1LP5256ESA-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 global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and enterprise applications.
The R1LP5256E Series was designed specifically for low-power, battery-backed memory applications demanding zero-refresh operation, TTL compatibility, and extended temperature reliability-targeting legacy and cost-sensitive embedded systems.
FAQ
What is the maximum operating frequency supported by R1LP5256ESA-5SR#B0?
R1LP5256ESA-5SR#B0 does not use a clock signal and has no maximum operating frequency specification. Its performance is defined by access timing: 55 ns address access time (tAA) and 55 ns read cycle time (tRC) at 5.0 V and 25°C. System-level throughput depends on host controller bus timing margins and is typically limited to ~12–15 MHz for reliable random-access operation. The R1LP5256ESA-5SR#B0 operates asynchronously-no clock input is required or provided.
Does R1LP5256ESA-5SR#B0 require external refresh circuitry?
No, R1LP5256ESA-5SR#B0 is a fully static RAM and requires no external refresh circuitry or periodic memory access to retain data. Its CMOS latch-based cell design maintains state indefinitely as long as Vcc remains within specification (4.5 V–5.5 V) and CS# is held high during standby. This eliminates refresh overhead in firmware and simplifies system design-confirmed in the "No clocks, No refresh" feature statement on page 1 of the datasheet.
What is the data retention capability of R1LP5256ESA-5SR#B0 during power loss?
R1LP5256ESA-5SR#B0 retains stored data down to Vcc = 2.0 V while drawing ≤10 µA at +85°C, enabling seamless transition to battery backup. Data retention time exceeds 10 years at room temperature with a typical coin-cell (e.g., CR2032) supplying 2.0–3.0 V. The device enters retention mode automatically when CS# is high and Vcc drops below 4.5 V-verified in the Low Vcc Data Retention Characteristics table (page 12).
Can R1LP5256ESA-5SR#B0 be used with 3.3 V microcontrollers?
R1LP5256ESA-5SR#B0 is specified for 4.5–5.5 V operation only and is not 3.3 V tolerant. Its VIH minimum is 2.2 V, but Vcc must remain ≥4.5 V for correct internal biasing and data retention. Interfacing with 3.3 V controllers requires level-shifting on all address, data, and control lines-or selection of a 3.3 V–compatible alternative such as AS6C4008-55PCN. Direct connection risks data corruption and premature wear.
What is the meaning of "-5SR" and "#B0" in R1LP5256ESA-5SR#B0?
In R1LP5256ESA-5SR#B0, "-5SR" denotes 55 ns access time and commercial temperature range (0°C to +70°C) per Renesas ordering nomenclature; however, this specific variant (R1LP5256ESA-5SR#B0) is explicitly listed in the datasheet's Ordering Information table (page 1) as rated for -40°C to +85°C ("I Ver."), indicating an industrial-grade screening. "#B0" specifies tray packaging (234 pcs/tray). The "ESA" suffix identifies the 28-pin TSOP package (PTSA0028ZA-A).
R1LP5256ESA-5SR#B0 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:
- 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-TSOP I
R1LP5256ESA-5SR#B0 FAQ
1.How can I place an order for R1LP5256ESA-5SR#B0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESA-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 R1LP5256ESA-5SR#B0 reliable?
The price and inventory of R1LP5256ESA-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 R1LP5256ESA-5SR#B0 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESA-5SR#B0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESA-5SR#B0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESA-5SR#B0?
R1LP5256ESA-5SR#B0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESA-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 R1LP5256ESA-5SR#B0?
For technical support, including R1LP5256ESA-5SR#B0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESA-5SR#B0 requirements.
6.How does Aetrix verify that R1LP5256ESA-5SR#B0 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESA-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 R1LP5256ESA-5SR#B0 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESA-5SR#B0?
All R1LP5256ESA-5SR#B0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESA-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 R1LP5256ESA-5SR#B0 part is unused and in its original packaging.
Return procedure for R1LP5256ESA-5SR#B0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LP5256ESA-5SR#B0 Tags
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