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Renesas R1LP5256ESA-7SR#B0
- Part No.:
- R1LP5256ESA-7SR#B0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
R1LP5256ESA-7SR#B0.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:745
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Product details
Overview
R1LP5256ESA-7SR#B0 from Renesas Electronics is a 256Kb low-power static RAM (32k × 8-bit) in 28-pin TSOP package, operating at 4.5–5.5V with 70 ns access time and typical standby current of 1 µA at 5.0V. It supports battery-backed memory systems requiring no refresh, TTL-compatible I/O, and three-state outputs for bus sharing - ideal for portable instrumentation and industrial control data buffers.
For engineers reviewing the R1LP5256ESA-7SR#B0 datasheet, R1LP5256ESA-7SR#B0 pinout, R1LP5256ESA-7SR#B0 application, or R1LP5256ESA-7SR#B0 equivalent, key selection criteria include its 70 ns read timing, 1 µA standby current at +25°C, TSOP package footprint compatibility, and support for simple parallel bus interfacing without clocks or refresh circuitry.
Technical Context
The R1LP5256ESA-7SR#B0 implements a fully static CMOS memory array with address decoding, sense/write amplifiers, and TTL-level input/output buffers. Its operation relies on active-low chip select (CS#), write enable (WE#), and output enable (OE#) controls to manage read/write cycles and high-impedance I/O states.
It features no internal clock or refresh logic, enabling deterministic timing behavior across temperature ranges (0 to +70°C). Data retention is guaranteed down to 2.0V Vcc with CS# held high, supporting battery backup modes where main supply drops while preserving stored values.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32,768 words × 8 bits) - provides compact byte-addressable storage for firmware variables or sensor history buffers. |
| Access time | 70 ns max - ensures compatibility with microcontrollers running at ≤14 MHz bus clock without wait states. |
| Supply voltage | 4.5 V to 5.5 V - matches standard 5V logic rails and tolerates ±10% regulation variation. |
| Standby current | 1 µA typical at 5.0V, +25°C - enables multi-year battery life in always-on backup applications. |
| Operating temperature | 0°C to +70°C - qualified for commercial-grade embedded systems including point-of-sale terminals and test equipment. |
| Package | 28-pin TSOP (PTSA0028ZA-A, 8mm × 13.4mm) - surface-mount compatible with automated assembly and space-constrained PCB layouts. |
| I/O interface | TTL-compatible inputs/outputs - eliminates level-shifting requirements when interfacing with legacy 5V MCUs or FPGAs. |
Pinout & Package
Package: 28-pin plastic TSOP (normal-bend type), JEDEC standard PTSA0028ZA-A (8mm × 13.4mm), tray packaging (234 pcs/tray).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | Primary 4.5–5.5V supply rail; decoupling capacitor required within 10 mm for stable operation. |
| Vss | Ground | Digital ground reference; must be connected to system GND plane with low-inductance path. |
| A0–A14 | Address inputs | 15-bit address bus accepting 0x0000–0x7FFF; no internal latching - address must be stable before CS# activation. |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus with three-state output drivers; OR-tie capable for shared bus configurations. |
| CS# | Chip select | Active-low enable; device enters standby (high-Z I/O, ~1 µA ICC) when high; controls data retention mode. |
| WE# | Write enable | Active-low write strobe; initiates write cycle when CS# is low; timing-critical for tAW, tWP, and tDW compliance. |
| OE# | Output enable | Active-low read control; prevents bus contention by disabling outputs when high during write or standby. |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Fully static architecture eliminates external refresh circuitry and associated timing overhead. |
| Low-voltage data retention | Maintains stored data down to Vcc = 2.0 V with CS# asserted - enables seamless transition to battery backup. |
| Three-state outputs | Enables direct connection to shared data buses without external bus transceivers or isolation logic. |
| TTL-compatible I/O | Direct interface with 5V microcontrollers, CPLDs, and legacy logic families without level translation. |
| Easy memory expansion | CS#-based chip selection allows daisy-chained or decoded addressing for multi-SRAM systems. |
Applications
| Portable Medical Monitors | Industrial PLC Data Loggers |
|---|---|
|
Use Scenario: Continuous acquisition of ECG waveforms and vital sign timestamps in battery-powered handheld monitors. IC Role / Device Role / Timing Role: Non-volatile buffer storing 30 seconds of raw waveform data prior to SD card transfer or wireless upload. Use Value: 1 µA standby current extends single-charge battery life beyond 12 months; 70 ns access supports real-time sampling at 10 kSPS without CPU intervention. |
Use Scenario: Local buffering of sensor readings (temperature, pressure, flow) in remote field-mounted PLCs with intermittent cellular uplink. IC Role / Device Role / Timing Role: High-reliability scratchpad memory holding last 10,000 samples during network outages. Use Value: No-refresh operation ensures data integrity during brownouts; TSOP package withstands thermal cycling in uncontrolled cabinet environments. |
| Point-of-Sale Terminals | Test & Measurement Equipment |
|
Use Scenario: Storing transaction receipts, tax tables, and firmware patch staging in retail terminals with frequent power cycling. IC Role / Device Role / Timing Role: Fast-access working memory for receipt generation and audit trail logging between power events. Use Value: 70 ns read timing enables sub-millisecond receipt print latency; TTL compatibility avoids redesign when upgrading host MCU. |
Use Scenario: Capturing oscilloscope waveform snapshots or logic analyzer trace buffers in benchtop instruments. IC Role / Device Role / Timing Role: High-speed parallel memory interfaced directly to FPGA-based acquisition engines. Use Value: Deterministic 70 ns access and no hidden refresh cycles guarantee precise trigger-to-capture timing alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 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 | Higher bandwidth but incompatible voltage and bus width; requires PCB redesign and level shifting. | Select only if migrating to 3.3V systems and needing wider data paths; not drop-in. |
| AS6C4008-70ZIN | 256K × 8, 70 ns access, 2.7–3.6V supply, 28-pin SOJ | Lower voltage range limits use in 5V systems; SOJ package differs mechanically from TSOP. | Consider for new 3.3V designs where footprint change is acceptable; not pin-compatible. |
Compared with IS61LV25616AL-10TLI and AS6C4008-70ZIN, the R1LP5256ESA-7SR#B0 uniquely supports 5V-only operation with TSOP mechanical compatibility and ultra-low 1 µA standby - making it optimal for legacy 5V industrial and medical devices requiring minimal BOM changes.
Availability
R1LP5256ESA-7SR#B0 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC data loggers, point-of-sale terminals, and test & measurement equipment requiring stable component supply across long product lifecycles.
Supply support for R1LP5256ESA-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, power, and memory solutions for industrial, automotive, and infrastructure markets.
The R1LP5256E Series was designed as low-power, no-refresh SRAM for battery-backed and energy-sensitive embedded systems - emphasizing reliability, simplicity, and long-term supply stability over high speed or density scaling.
FAQ
What is the maximum operating temperature range for the R1LP5256ESA-7SR#B0?
The R1LP5256ESA-7SR#B0 is rated for operation from 0°C to +70°C (R-version). This commercial temperature grade is validated per the datasheet's DC and AC characteristics tables and applies specifically to the -7SR#B0 suffix variant. Operation outside this range may result in timing violations or increased standby current beyond specification.
Does the R1LP5256ESA-7SR#B0 require an external clock or refresh signal?
No, the R1LP5256ESA-7SR#B0 is a fully static RAM and requires neither an external clock nor periodic refresh cycles. Its memory cells retain data as long as power and CS# are maintained, eliminating refresh controller logic and associated power overhead - a core design feature confirmed in the "No clocks, No refresh" datasheet feature list.
What is the minimum supply voltage at which the R1LP5256ESA-7SR#B0 retains data?
The R1LP5256ESA-7SR#B0 guarantees data retention down to 2.0 V Vcc when CS# is held high, as specified in the Low Vcc Data Retention Characteristics table (Page 12). At 3.0 V, typical retention current is 2 µA at +25°C, rising to 10 µA at +85°C - enabling robust battery backup functionality.
Is the R1LP5256ESA-7SR#B0 pin-compatible with other variants in the R1LP5256E Series?
Yes, all R1LP5256E Series parts - including R1LP5256ESA-5SR#B0, R1LP5256ESA-7SI#B0, and R1LP5256ESP-7SR#B0 - share identical pinouts for the same package type. The R1LP5256ESA-7SR#B0 uses the 28-pin TSOP footprint (PTSA0028ZA-A), matching all other -ESA suffix variants, though SOP (-ESP) variants use a different physical package.
What does the "#B0" suffix indicate in R1LP5256ESA-7SR#B0?
The "#B0" suffix denotes tube packaging (max. 234 pcs/tray) and RoHS-compliant lead-free finish, as defined in the Ordering Information table (Page 1). It distinguishes this variant from tape-and-reel versions marked "#S0", and confirms compliance with environmental regulations without affecting electrical or timing specifications of the R1LP5256ESA-7SR#B0.
R1LP5256ESA-7SR#B0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm 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-TSOP I
R1LP5256ESA-7SR#B0 FAQ
1.How can I place an order for R1LP5256ESA-7SR#B0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESA-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 R1LP5256ESA-7SR#B0 reliable?
The price and inventory of R1LP5256ESA-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 R1LP5256ESA-7SR#B0 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESA-7SR#B0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESA-7SR#B0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESA-7SR#B0?
R1LP5256ESA-7SR#B0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESA-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 R1LP5256ESA-7SR#B0?
For technical support, including R1LP5256ESA-7SR#B0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESA-7SR#B0 requirements.
6.How does Aetrix verify that R1LP5256ESA-7SR#B0 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESA-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 R1LP5256ESA-7SR#B0 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESA-7SR#B0?
All R1LP5256ESA-7SR#B0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESA-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 R1LP5256ESA-7SR#B0 part is unused and in its original packaging.
Return procedure for R1LP5256ESA-7SR#B0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LP5256ESA-7SR#B0 Tags
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