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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Renesas M5M5256DFP-55XL#SM

Name: M5M5256DFP-55XL#SM
Brand: Renesas
SKU: M5M5256DFP-55XL#SM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M5M5256DFP-55XL#SM

Manufacturer:: Renesas

Category:: Memory

Package:: -

Datasheet:: M5M5256DFP-55XL#SM.pdf

Description:: STANDARD SRAM, 32KX8

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Inventory:15,000

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Product details

Overview

M5M5256DFP-55XL#SM from Renesas is a 262,144-bit (32,768-word × 8-bit) CMOS static RAM with single +5V supply, 55 ns access time, TTL-compatible I/O, and battery backup capability supporting data hold down to +2.0 V. It serves as non-refresh, low-power main memory in embedded controllers and legacy industrial systems requiring direct bus interfacing.

For engineers reviewing the M5M5256DFP-55XL#SM datasheet, M5M5256DFP-55XL#SM pinout, M5M5256DFP-55XL#SM application, or M5M5256DFP-55XL#SM equivalent, key selection criteria include standby current (0.05 µA typ.), /OE-controlled three-state outputs, /S-/W dual-control write mode, and 28-pin SOP package compatibility with legacy 5V memory buses.

Technical Context

This SRAM uses resistive-load NMOS memory cells with CMOS periphery for high density and ultra-low standby power. Its operation relies on asynchronous control via /S (chip select), /W (write enable), and /OE (output enable), enabling both /W- and /S-controlled write cycles per function table.

The device supports two distinct power-down states: full standby (I_cc4 = 0.05 µA typ. at V_CC = 5.5 V) and data retention mode (V_CC(PD) ≥ 2.2 V), with guaranteed data hold at +2.0 V - critical for battery-backed memory preservation during brownout or shutdown.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	32,768 words × 8 bits = 262,144 bits; supports byte-wide parallel data bus interfacing without address multiplexing.
Access time	55 ns max at V_CC = 5V ±10%; enables direct replacement in 55 ns-class legacy memory subsystems (e.g., Z80, 8086-based designs).
Standby current	0.05 µA typical at V_CC = 5.5 V; allows >1-year battery backup using standard CR2032 when V_CC drops to +2.0 V.
I/O compatibility	Fully TTL-compatible inputs and outputs; interfaces directly with 5V logic families without level-shifting circuitry.
Control interface	Three independent controls: /S (chip select), /W (write enable), /OE (output enable); supports OR-tie expansion and eliminates bus contention.
Operating voltage	Single +5V supply (4.5–5.5 V); no auxiliary voltages required - simplifies power design in cost-sensitive embedded systems.

Pinout & Package

M5M5256DFP-55XL#SM is housed in a 28-pin plastic SOP (Small Outline Package), outline code 28P2W-C, 450 mil width. Pin pitch is 1.27 mm; body dimensions are 18.4 mm × 7.6 mm × 2.35 mm.

Pin/Terminal	Circuit Role	Design Meaning
A0–A14	Address inputs	15-bit address bus accepting 0–32767; fully decoded - no external address latch needed.
DQ1–DQ8	Bi-directional data I/O	Common 8-bit data bus; high-impedance when /OE = H or /S = H - enables multi-chip memory expansion.
/S	Chip select	Active-low chip enable; must be low for read/write; high puts outputs in high-Z and reduces I_cc to standby level.
/W	Write enable	Active-low write strobe; write occurs on overlap of /W and /S low; latches data on trailing edge of either signal.
/OE	Output enable	Active-low output control; overrides /W to force high-Z state - prevents bus contention during writes.
V_CC	Power supply	+5V supply pin; decoupling capacitor required within 10 mm for stable 55 ns timing.
GND	Ground	Signal and power ground reference; must be low-inductance connection to minimize noise coupling into data/address lines.

Key Features

Feature	Design Value
No refresh required	Asynchronous static architecture eliminates need for external refresh circuitry or timing controller - reduces BOM and PCB area.
Data hold at +2.0 V	Guaranteed memory retention down to V_CC = 2.0 V; enables seamless transition to battery backup without data loss during power failure.
Three-state outputs	Independent /OE control allows dynamic bus arbitration - essential for shared data bus architectures with multiple peripherals.
Low active current	50 mA max active supply current (TTL-level drive); compatible with standard 5V bus drivers and avoids thermal derating in compact enclosures.
Direct TTL interface	VIH = 2.2 V min, VIL = 0.8 V max - ensures reliable logic recognition across temperature and voltage tolerances without external biasing.

Applications

Industrial PLC Memory Buffer	Legacy Microcontroller Data RAM
Use Scenario: Non-volatile data logging buffer in programmable logic controllers operating in 0–70°C ambient with periodic mains interruption. IC Role / Device Role / Timing Role: Primary 32 KB byte-accessible SRAM providing fast read/write for real-time I/O status and recipe storage. Use Value: 0.05 µA standby current and +2.0 V data hold enable >30-day battery backup using coin-cell - eliminating need for supercapacitors or complex power management ICs.	Use Scenario: Main working RAM in retro-computing or educational 8-bit development boards based on Z80 or 6502 CPUs. IC Role / Device Role / Timing Role: Asynchronous parallel memory mapped at fixed address space; accessed via /S, /W, /OE handshake with CPU bus cycle. Use Value: 55 ns access time matches Z80's 2-cycle memory read timing at 4 MHz; TTL compatibility eliminates level shifters - reducing component count and layout complexity.
Medical Instrument Parameter Storage	Point-of-Sale Terminal Configuration Memory
Use Scenario: Storing calibration coefficients and user preferences in portable diagnostic devices powered by rechargeable Li-ion batteries. IC Role / Device Role / Timing Role: Battery-backed configuration memory retaining settings during sleep or battery swap events. Use Value: Guaranteed data retention at +2.0 V allows use of simple diode-OR'd battery path - no dedicated backup regulator required, cutting bill-of-materials cost by ~$0.35/unit.	Use Scenario: Fast-access configuration store in retail POS terminals subject to frequent power cycling and firmware updates. IC Role / Device Role / Timing Role: Dedicated SRAM block holding display settings, tax tables, and peripheral mappings - updated only during initialization or admin mode. Use Value: Three-state outputs and /OE control prevent bus conflicts during firmware update sequences where other peripherals share the same data bus - improving field reliability and reducing support calls.

Industrial PLC Memory Buffer

Legacy Microcontroller Data RAM

Use Scenario: Non-volatile data logging buffer in programmable logic controllers operating in 0–70°C ambient with periodic mains interruption.

IC Role / Device Role / Timing Role: Primary 32 KB byte-accessible SRAM providing fast read/write for real-time I/O status and recipe storage.

Use Value: 0.05 µA standby current and +2.0 V data hold enable >30-day battery backup using coin-cell - eliminating need for supercapacitors or complex power management ICs.

Use Scenario: Main working RAM in retro-computing or educational 8-bit development boards based on Z80 or 6502 CPUs.

IC Role / Device Role / Timing Role: Asynchronous parallel memory mapped at fixed address space; accessed via /S, /W, /OE handshake with CPU bus cycle.

Use Value: 55 ns access time matches Z80's 2-cycle memory read timing at 4 MHz; TTL compatibility eliminates level shifters - reducing component count and layout complexity.

Medical Instrument Parameter Storage

Point-of-Sale Terminal Configuration Memory

Use Scenario: Storing calibration coefficients and user preferences in portable diagnostic devices powered by rechargeable Li-ion batteries.

IC Role / Device Role / Timing Role: Battery-backed configuration memory retaining settings during sleep or battery swap events.

Use Value: Guaranteed data retention at +2.0 V allows use of simple diode-OR'd battery path - no dedicated backup regulator required, cutting bill-of-materials cost by ~$0.35/unit.

Use Scenario: Fast-access configuration store in retail POS terminals subject to frequent power cycling and firmware updates.

IC Role / Device Role / Timing Role: Dedicated SRAM block holding display settings, tax tables, and peripheral mappings - updated only during initialization or admin mode.

Use Value: Three-state outputs and /OE control prevent bus conflicts during firmware update sequences where other peripherals share the same data bus - improving field reliability and reducing support calls.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IS61LV25616AL-10TLI	32K × 16-bit organization, 10 ns access, 3.3 V supply only; no +2.0 V data hold guarantee.	Requires level translation for 5V systems; unsuitable for battery backup below 2.7 V.	Select only if migrating to 3.3 V architecture and higher bandwidth (16-bit bus) is required.
AS6C4008-55PCN	512K × 8-bit, 55 ns access, +5 V supply, 1 µA standby (typ.), no +2.0 V hold spec.	Higher density but larger footprint (32-pin SOJ); lacks guaranteed sub-2.2 V retention.	Choose for capacity upgrade where board space permits and battery backup is handled externally.

Compared with IS61LV25616AL-10TLI and AS6C4008-55PCN, the M5M5256DFP-55XL#SM uniquely delivers verified +2.0 V data hold, 0.05 µA standby, and native 5V TTL compatibility - making it irreplaceable in legacy 5V systems requiring true zero-refresh, long-duration battery backup without redesign.

Availability

M5M5256DFP-55XL#SM is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller systems, medical instrumentation, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.

Supply support for M5M5256DFP-55XL#SM 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 infrastructure markets.

The M5M5256DFP-55XL#SM belongs to Renesas' legacy CMOS SRAM product line, designed specifically for cost-sensitive, high-reliability 5V embedded systems requiring zero-refresh operation and robust battery backup capability.

FAQ

What is the minimum supply voltage at which M5M5256DFP-55XL#SM retains stored data?

M5M5256DFP-55XL#SM guarantees data retention down to +2.0 V supply voltage, as specified in the Power Down Characteristics section. This enables reliable battery backup operation during power failure or intentional shutdown. The M5M5256DFP-55XL#SM maintains memory contents without refresh at this voltage, provided /S remains high to enter standby mode. Operation below +2.0 V risks data loss and is not characterized.

Does M5M5256DFP-55XL#SM require an external clock or refresh signal?

No, M5M5256DFP-55XL#SM is a static RAM and requires no external clock or refresh signal. Its CMOS/NMOS cell structure maintains data indefinitely as long as power is applied and /S is asserted appropriately. The M5M5256DFP-55XL#SM operates asynchronously using only /S, /W, and /OE control signals - simplifying system timing design and eliminating refresh overhead in microcontroller-based systems.

Can M5M5256DFP-55XL#SM be used in a 3.3 V system?

M5M5256DFP-55XL#SM is rated for 4.5–5.5 V operation and is not specified for 3.3 V use. While some units may function at 3.3 V, parameters like access time, standby current, and data hold are not guaranteed outside the 5V range. Using M5M5256DFP-55XL#SM in a 3.3 V system risks timing violations and unreliable data retention. For 3.3 V designs, consider purpose-built low-voltage SRAMs instead.

How does the /OE pin function during write operations on M5M5256DFP-55XL#SM?

During write operations, the /OE pin on M5M5256DFP-55XL#SM controls output driver state independently of /W. When /OE is high, outputs go high-impedance regardless of /W state - preventing bus contention when other devices drive the same data lines. This behavior is explicitly defined in the Function Table and ensures safe multi-chip memory expansion. The M5M5256DFP-55XL#SM thus supports clean write cycles even in shared-bus configurations.

What is the maximum active supply current for M5M5256DFP-55XL#SM under TTL-level drive conditions?

The maximum active supply current for M5M5256DFP-55XL#SM under TTL-level drive conditions is 50 mA, as specified in the DC Electrical Characteristics table for I_cc1. This value applies at V_CC = 5.5 V and represents worst-case current draw during sustained read/write activity with all outputs driving TTL loads. The M5M5256DFP-55XL#SM remains within thermal limits in standard 28-pin SOP packages when proper PCB copper pour and airflow are maintained.

M5M5256DFP-55XL#SM Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Programmable:: Not Verified

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Memory Interface:: -

Clock Frequency:: -

Write Cycle Time - Word, Page:: -

Access Time:: -

Voltage - Supply:: -

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M5M5256DFP-55XL#SM FAQ

1.How can I place an order for M5M5256DFP-55XL#SM through Aetrix?

Please submit a Request for Quotation (RFQ) for M5M5256DFP-55XL#SM 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 M5M5256DFP-55XL#SM reliable?

The price and inventory of M5M5256DFP-55XL#SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M5M5256DFP-55XL#SM is usually 5 days.

3.What payment methods are accepted for M5M5256DFP-55XL#SM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M5M5256DFP-55XL#SM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M5M5256DFP-55XL#SM?

M5M5256DFP-55XL#SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M5M5256DFP-55XL#SM 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 M5M5256DFP-55XL#SM?

For technical support, including M5M5256DFP-55XL#SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M5M5256DFP-55XL#SM requirements.

6.How does Aetrix verify that M5M5256DFP-55XL#SM is sourced from the original manufacturer or authorized distributors?

All M5M5256DFP-55XL#SM 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 M5M5256DFP-55XL#SM meets industry standards.

7.What is the process for return or replacement of M5M5256DFP-55XL#SM?

All M5M5256DFP-55XL#SM units undergo pre-shipment inspection (PSI). If there is an issue with M5M5256DFP-55XL#SM, 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 M5M5256DFP-55XL#SM part is unused and in its original packaging.

Return procedure for M5M5256DFP-55XL#SM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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