Renesas R1LV5256ESA-5SR#B0

Overview

R1LV5256ESA-5SR#B0 from Renesas Electronics is a 256Kb low-power static RAM organized as 32,768 × 8-bit, operating from a single 2.7–3.6V supply, with 55 ns access time, TTL-compatible I/O, and 1 µA typical standby current at 3.0V. It serves as non-volatile memory backup storage in battery-powered instrumentation and portable medical devices requiring zero-refresh operation and simple parallel bus interfacing.

For engineers reviewing the R1LV5256ESA-5SR#B0 datasheet, R1LV5256ESA-5SR#B0 pinout, R1LV5256ESA-5SR#B0 application, or R1LV5256ESA-5SR#B0 equivalent, key selection criteria include its TSOP-28 package, -40°C to +85°C industrial temperature grade, 32k×8 organization, no-clock/no-refresh architecture, and compatibility with legacy 8-bit microcontroller data buses.

Technical Context

This device implements a fully static CMOS memory array with integrated address decoder, sense/write amplifier, and output buffer control logic. All control signals (CS#, WE#, OE#) are active-low and TTL-compatible, enabling direct connection to standard microcontrollers without level translation.

It supports asynchronous read/write cycles with deterministic timing-tAA = 55 ns, tRC = 55 ns, tOE = 30 ns-and features three-state outputs with OR-tie capability for bus sharing. Data retention is guaranteed down to VCC = 2.0V with CS# high, drawing ≤10 µA at +85°C.

Key Specifications

Pinout & Package

Package: 28-pin TSOP (8 mm × 13.4 mm, normal-bend type, PTSA0028ZA-A).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar static RAM applications.

Compared with IS61LV25616AL-10TLI and AS6C4008-55ZIN, the R1LV5256ESA-5SR#B0 offers superior ultra-low-power performance for battery-critical applications while maintaining full pin compatibility with legacy 8-bit systems - making it optimal for medical and portable instrumentation where standby current and package fit are decisive.

Availability

R1LV5256ESA-5SR#B0 is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial data loggers, automotive body control modules, and legacy PLC I/O expansion requiring stable component supply and long-term lifecycle support.

Supply support for R1LV5256ESA-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 R1LV5256E Series was designed specifically for low-voltage, low-power memory applications in battery-operated and energy-conscious embedded systems - emphasizing simplicity, reliability, and extended data retention without refresh overhead.

FAQ

What is the maximum operating temperature range for the R1LV5256ESA-5SR#B0?

The R1LV5256ESA-5SR#B0 is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the Ordering Information table on page 1 of the R10DS0068EJ0100 datasheet, where "I Ver." denotes the -40°C to +85°C range and the part suffix "-5SI" or "-7SI" explicitly identifies the industrial grade. The R1LV5256ESA-5SR#B0 uses the "-5S" speed grade and "I" temperature grade, making it suitable for under-hood automotive modules and factory-floor controllers.

Does the R1LV5256ESA-5SR#B0 require an external clock or refresh circuitry?

No, the R1LV5256ESA-5SR#B0 is a fully static RAM and requires neither an external clock nor refresh circuitry. As stated in the Features section on page 1 of the datasheet, it implements "No clocks, No refresh" operation. Its memory array retains data indefinitely as long as Vcc and CS# are maintained within specification - eliminating timing-critical refresh interrupts and simplifying firmware design for resource-constrained microcontrollers interfacing with the R1LV5256ESA-5SR#B0.

What package type and pin count does the R1LV5256ESA-5SR#B0 use?

The R1LV5256ESA-5SR#B0 uses an 8 mm × 13.4 mm 28-pin plastic TSOP (thin small-outline package) with normal-bend leads, identified in the datasheet as PTSA0028ZA-A (28P2C-A). This is confirmed in the Ordering Information table on page 1 and the Pin Arrangement diagram on page 2, which shows the 28-pin TSOP layout. The "ESA" prefix in the part number explicitly denotes the TSOP package variant, distinguishing it from SOP ("ESP") and other variants.

What is the typical standby current of the R1LV5256ESA-5SR#B0 at 3.0V?

The typical standby current of the R1LV5256ESA-5SR#B0 is 1 µA at Vcc = 3.0V and Ta = +25°C, as specified in the DC Characteristics table on page 5 of the R10DS0068EJ0100 datasheet under "Standby current (ISB1)". This value is measured with CS# = VIH and all other inputs at Vss or Vcc. At elevated temperatures, ISB increases to 3 µA at +40°C and 8 µA at +70°C, remaining well below 10 µA even at the full +85°C limit - a key advantage for battery-backed applications relying on the R1LV5256ESA-5SR#B0.

Is the R1LV5256ESA-5SR#B0 pin-compatible with older 256Kb SRAMs like the 62256?

Yes, the R1LV5256ESA-5SR#B0 is functionally and pin-compatible with industry-standard 32k×8 SRAMs such as the 62256, sharing identical pin functions (A0–A14, DQ0–DQ7, CS#, WE#, OE#, Vcc, Vss) and TSOP-28 footprint. The Pin Description table on page 2 confirms matching signal assignments, and the Block Diagram on page 3 validates equivalent memory organization and control logic. While electrical parameters differ (e.g., lower Vcc range, reduced ISB), the R1LV5256ESA-5SR#B0 can serve as a direct drop-in replacement in existing 62256-based designs with no PCB changes required.