My Inquiry
My Account
Renesas R1LP5256ESA-5SI#S0
- Part No.:
- R1LP5256ESA-5SI#S0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
R1LP5256ESA-5SI#S0.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:16,608
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
R1LP5256ESA-5SI#S0 from Renesas Electronics is a 256Kb low-power static RAM (32k × 8-bit) in 28-pin TSOP package, operating from 4.5V to 5.5V with 55 ns access time, -40°C to +85°C industrial temperature range, and 1 µA typical standby current. It serves as non-volatile memory backup buffer in battery-powered instrumentation and embedded controllers requiring zero-refresh, TTL-compatible interfacing, and data retention down to 2.0V.
For engineers reviewing the R1LP5256ESA-5SI#S0 datasheet, R1LP5256ESA-5SI#S0 pinout, R1LP5256ESA-5SI#S0 application, or R1LP5256ESA-5SI#S0 equivalent, key selection criteria include industrial-grade temperature support, TSOP-28 footprint compatibility, 55 ns read/write timing, low VCC data retention capability, and three-state I/O with OR-tie capability for bus expansion.
Technical Context
The R1LP5256ESA-5SI#S0 implements a fully static CMOS memory array with no internal clocks or refresh circuitry, enabling deterministic timing and ultra-low power in sleep modes. Its address decoder supports full 15-bit addressing (A0–A14), and all control signals (CS#, WE#, OE#) are active-low with TTL-level thresholds.
It features common bidirectional data I/O (DQ0–DQ7), chip-select–gated output enable, and write-enable–controlled write cycles. Standby current drops to 1 µA at 5.0V/25°C, and data retention remains valid at VCC ≥ 2.0V with CS# held high, making it suitable for battery-backed memory hold applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32,768 × 8-bit); provides byte-wide storage for microcontroller data buffers and configuration registers. |
| Access time | 55 ns max; ensures compatibility with 18 MHz bus systems without wait states. |
| Supply voltage | 4.5 V to 5.5 V; operates reliably across standard 5V rail tolerances and brown-out conditions. |
| Standby current | 1 µA typical at 5.0V/25°C; enables multi-year battery life in always-on backup memory applications. |
| Data retention VCC | 2.0 V min; retains stored data during deep battery discharge or power-fail scenarios. |
| Operating temperature | -40°C to +85°C; qualified for industrial environments including factory automation and outdoor telemetry. |
| I/O interface | TTL-compatible inputs/outputs; interfaces directly with legacy 5V microcontrollers and FPGAs without level shifters. |
Pinout & Package
Package: 8 mm × 13.4 mm 28-pin plastic TSOP (normal-bend type), PTSA0028ZA-A (28P2C-A), surface-mount, tape-and-reel (1000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | +4.5V to +5.5V main supply; decoupling capacitor required near pin for noise immunity. |
| Vss | Ground | Signal and power return reference; must be connected to system ground plane. |
| A0–A14 | Address input | 15-bit address bus; selects one of 32,768 memory locations for read/write operations. |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus; high-impedance when CS# or OE# is high. |
| CS# | Chip select | Active-low enable; disables all internal circuitry and reduces current to standby level when high. |
| WE# | Write enable | Active-low write strobe; latches DQ0–DQ7 into memory when CS# is low and OE# is high. |
| OE# | Output enable | Active-low output control; prevents bus contention by tri-stating DQ0–DQ7 when high. |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Fully static architecture eliminates DRAM-style refresh overhead and timing complexity. |
| OR-tie capability | Three-state outputs allow multiple R1LP5256ESA-5SI#S0 devices to share a common data bus without external logic. |
| Low-voltage data retention | Maintains stored data at VCC as low as 2.0V while CS# is asserted, supporting battery failover designs. |
| TTL-compatible signaling | Direct interface with legacy 5V microcontrollers, CPLDs, and peripheral ICs without level translation. |
| Easy memory expansion | CS#-based chip selection enables straightforward banked memory configurations using address decoding. |
Applications
| Industrial Data Logger | Medical Patient Monitor |
|---|---|
|
Use Scenario: Continuous acquisition of sensor readings (ECG, SpO₂, temperature) during power interruption or battery swap. IC Role / Device Role / Timing Role: Non-volatile data buffer preserving critical waveform segments and timestamps during transient power loss. Use Value: Enables uninterrupted data continuity with <2.0V data retention and 1 µA standby draw, extending battery life and ensuring regulatory-compliant event logging. |
Use Scenario: Real-time storage of vital sign history and alarm-triggered snapshots in portable diagnostic equipment. IC Role / Device Role / Timing Role: High-reliability SRAM holding volatile patient data between host processor writes and flash backup cycles. Use Value: 55 ns access time supports real-time display updates; -40°C to +85°C rating ensures operation in clinical transport and field deployment environments. |
| Smart Meter Firmware Cache | Factory Automation PLC Module |
|
Use Scenario: Caching firmware patch instructions and metering calibration tables during over-the-air update sequences. IC Role / Device Role / Timing Role: Byte-accessible scratchpad memory for secure, low-latency execution of update routines without flash wear. Use Value: TTL compatibility simplifies integration with existing 5V meter SoCs; 28-pin TSOP footprint allows drop-in replacement in space-constrained meter PCBs. |
Use Scenario: Storing I/O state snapshots and motion control command queues in modular industrial controllers. IC Role / Device Role / Timing Role: Deterministic, zero-wait-state memory for cyclic process data exchange between CPU and fieldbus interface ASICs. Use Value: No refresh requirement guarantees timing predictability in hard real-time loops; 55 ns tAA meets sub-200 ns cycle budget requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power static RAM 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 pinout; requires PCB redesign and level shifting. | Select only if 16-bit data path and faster timing outweigh migration cost. |
| AS6C4008-55PCN | 28-pin SOP, 55 ns, 4.5–5.5V, -40°C to +85°C, 2 µA standby (typ) | Same speed/voltage/temp specs but SOP package; lacks TSOP mechanical compatibility. | Choose for through-hole or SOP-based legacy designs where board rework is acceptable. |
Compared with IS61LV25616AL-10TLI and AS6C4008-55PCN, the R1LP5256ESA-5SI#S0 uniquely combines TSOP-28 footprint, 55 ns timing, industrial temp range, and 1 µA standby in a 5V-only 8-bit SRAM-making it optimal for space-constrained, battery-sensitive upgrades of existing 28-pin designs.
Availability
R1LP5256ESA-5SI#S0 is available at Aetrix Electronics and suitable for industrial data loggers, medical patient monitors, smart meter firmware caches, and factory automation PLC modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for R1LP5256ESA-5SI#S0 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 a low-power, pin-compatible upgrade path for legacy 5V SRAMs in battery-backed and industrial control applications-emphasizing data retention, TTL interoperability, and extended temperature reliability.
FAQ
What is the maximum operating frequency supported by the R1LP5256ESA-5SI#S0?
The R1LP5256ESA-5SI#S0 does not use a clock signal and has no maximum operating frequency specification. Its performance is defined by timing parameters: 55 ns access time (tAA), 55 ns read cycle (tRC), and 55 ns write cycle (tWC). These values support reliable operation with bus controllers running up to approximately 18 MHz without wait states, assuming proper setup/hold margins are met in the system design. The R1LP5256ESA-5SI#S0 relies on asynchronous control signals (CS#, WE#, OE#) rather than synchronous clocking.
Does the R1LP5256ESA-5SI#S0 require external refresh circuitry?
No, the R1LP5256ESA-5SI#S0 is a fully static RAM and requires no external refresh circuitry or periodic access to retain data. Its CMOS memory cell design maintains state indefinitely as long as power is applied and CS# is held high during standby. This eliminates refresh overhead, simplifies system design, and improves timing predictability-key advantages over DRAM or pseudo-SRAM solutions. The R1LP5256ESA-5SI#S0 retains data even at reduced VCC (down to 2.0V) when CS# is asserted.
What is the pin compatibility status of R1LP5256ESA-5SI#S0 with other members of the R1LP5256E Series?
The R1LP5256ESA-5SI#S0 shares identical pinout, signal definitions, and electrical characteristics with all other R1LP5256E Series variants in the same TSOP package-including R1LP5256ESA-5SR#S0, R1LP5256ESA-7SI#S0, and R1LP5256ESA-7SR#S0. Differences are limited to access time (55 ns vs. 70 ns) and temperature grade (industrial -40°C to +85°C vs. commercial 0°C to +70°C), both of which are fully backward-compatible. The R1LP5256ESA-5SI#S0 may be substituted for slower or commercial-grade versions without hardware changes.
Can the R1LP5256ESA-5SI#S0 be used in a 3.3V system?
No, the R1LP5256ESA-5SI#S0 is specified exclusively for 4.5V to 5.5V operation and is not rated for 3.3V supply. Its input thresholds (VIH = 2.2V min, VIL = 0.8V max) and DC/AC characteristics are validated only within the 5V range. Attempting to operate the R1LP5256ESA-5SI#S0 at 3.3V may result in unreliable read/write behavior, increased standby current, or data corruption. For 3.3V systems, consider functionally similar alternatives such as the IS61LV25616AL series or AS6C4008-55TIN, which are explicitly characterized at 3.3V.
What is the meaning of the "#S0" suffix in R1LP5256ESA-5SI#S0?
The "#S0" suffix in R1LP5256ESA-5SI#S0 indicates embossed tape-and-reel packaging: 1000 units per reel, compliant with EIA-481-D standards. This differs from "#B0", which denotes tube packaging (max. 234 pcs/tray). The "S" denotes tape format, and "0" specifies the standard reel size and orientation. The core electrical and thermal specifications-including 55 ns access time and -40°C to +85°C operation-are unchanged between #S0 and #B0 variants. The R1LP5256ESA-5SI#S0 is optimized for automated SMT placement in high-volume manufacturing.
R1LP5256ESA-5SI#S0 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP I
R1LP5256ESA-5SI#S0 FAQ
1.How can I place an order for R1LP5256ESA-5SI#S0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESA-5SI#S0 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-5SI#S0 reliable?
The price and inventory of R1LP5256ESA-5SI#S0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1LP5256ESA-5SI#S0 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESA-5SI#S0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESA-5SI#S0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESA-5SI#S0?
R1LP5256ESA-5SI#S0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESA-5SI#S0 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-5SI#S0?
For technical support, including R1LP5256ESA-5SI#S0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESA-5SI#S0 requirements.
6.How does Aetrix verify that R1LP5256ESA-5SI#S0 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESA-5SI#S0 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-5SI#S0 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESA-5SI#S0?
All R1LP5256ESA-5SI#S0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESA-5SI#S0, 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-5SI#S0 part is unused and in its original packaging.
Return procedure for R1LP5256ESA-5SI#S0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1LP5256ESA-5SI#S0 Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
