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

Renesas M5M5256DFP-70G#BM

Name: M5M5256DFP-70G#BM
Brand: Renesas
SKU: M5M5256DFP-70G#BM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M5M5256DFP-70G#BM

Manufacturer:: Renesas

Category:: Memory

Package:: -

Datasheet:: M5M5256DFP-70G#BM.pdf

Description:: STANDARD SRAM, 32KX8

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Product details

Overview

M5M5256DFP-70G#BM from Renesas is a 262,144-bit (32,768 × 8) CMOS static RAM in 28-pin SOP package, operating on single +5V supply with 70 ns access time, TTL-compatible I/O, and three-state outputs for bus sharing. It supports battery backup via data hold at +2.0V and delivers ultra-low standby current of 0.05 µA (typ), ideal for low-power embedded memory systems.

For engineers reviewing the M5M5256DFP-70G#BM datasheet, M5M5256DFP-70G#BM pinout, M5M5256DFP-70G#BM application, or M5M5256DFP-70G#BM equivalent, key selection criteria include /S-/W-/OE control timing, 70 ns read/write cycle compatibility, 28-pin SOP footprint, and verified 0.05 µA standby current under Vcc = 5.5V at 25°C.

Technical Context

The M5M5256DFP-70G#BM implements a full CMOS static RAM architecture using resistive-load NMOS memory cells and CMOS periphery, enabling high density and low power. Its operation relies on asynchronous /S (chip select), /W (write enable), and /OE (output enable) signals to define read, write, standby, and non-selection modes per the function table.

It supports two write control modes (/W-controlled and /S-controlled), requires no clocks or refresh, and maintains data integrity during power failure via +2.0V data-hold capability. The device is specified for 0–70°C operation and meets TTL-level input/output voltage thresholds (VIH = 2.4V, VIL = 0.8V, VOH = 2.4V @ IOH = −1mA, VOL = 0.4V @ IOL = 2mA).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	32,768 words × 8 bits = 262,144 bits; supports byte-wide data bus interfacing without external multiplexing.
Access time	70 ns max (t_AA, t_CR, t_CW); ensures compatibility with 14 MHz bus timing in legacy microcontroller systems.
Supply voltage	+5V ±10% (4.5–5.5V); single-rail operation eliminates need for dual supplies or regulators.
Standby current	0.05 µA typical at Vcc = 5.5V, 25°C; enables multi-year battery backup in SRAM-retention applications.
Data hold voltage	+2.0V minimum; retains stored data during brown-out or controlled power-down without external circuitry.
I/O compatibility	Direct TTL interface: inputs accept 0.8V/2.4V thresholds, outputs drive −1mA/2mA loads to standard logic levels.
Operating temperature	0°C to +70°C; validated for commercial-grade industrial control and instrumentation environments.

Pinout & Package

Package: 28-pin plastic SOP (Small Outline Package), outline 28P2C-A, 450 mil width (11.43 mm), body height 2.65 mm, lead pitch 1.27 mm.

Pin/Terminal	Circuit Role	Design Meaning
A0–A14	Address inputs	15-bit address bus supporting full 32K-word decoding; no internal multiplexing required.
DQ1–DQ8	Bi-directional data I/O	Common data bus pins with three-state output drivers; enables shared bus topology via /OE control.
/S	Chip select	Active-low enable; places device in standby mode when high, reducing Icc to 0.05 µA and enabling OR-tie expansion.
/W	Write enable	Active-low write strobe; initiates write cycle on overlap with /S low; latches data on trailing edge.
/OE	Output enable	Active-low control for output drivers; prevents bus contention during writes by forcing high-impedance state.
Vcc	Power supply	+5V supply pin; decoupling capacitor placement adjacent to this pin is critical for noise immunity.
GND	Ground reference	Signal and power ground return; must be connected to low-impedance system ground plane.

Key Features

Feature	Design Value
No clock or refresh required	Asynchronous operation simplifies timing design and eliminates refresh overhead in microcontroller-based systems.
Three-state outputs with /OE	Enables direct connection to shared data buses without external bus transceivers or arbitration logic.
Battery backup support	Valid data retention at +2.0V allows integration with coin-cell backup circuits for nonvolatile memory preservation.
TTL-compatible I/O	Eliminates level-shifting components when interfacing with legacy 5V microcontrollers, CPLDs, or FPGAs.
Low active current	50 mA max (Icc1) at 70 ns access ensures thermal stability in dense PCB layouts without forced air cooling.

Applications

Industrial PLC Memory Buffer	Medical Device Data Logger
Use Scenario: Storing real-time sensor readings and configuration parameters in programmable logic controllers with intermittent power cycles. IC Role / Device Role / Timing Role: Byte-accessible static RAM providing deterministic 70 ns read/write latency for deterministic scan-cycle execution. Use Value: Zero-refresh operation and +2.0V data hold ensure uninterrupted data integrity during brief AC outages or scheduled maintenance shutdowns.	Use Scenario: Capturing patient vital signs in portable ECG monitors requiring long-term battery operation between charges. IC Role / Device Role / Timing Role: Low-power memory buffer holding waveform samples prior to wireless transmission or SD card storage. Use Value: 0.05 µA standby current extends coin-cell life beyond 5 years while preserving last-recorded diagnostics upon power loss.
Legacy Embedded Controller Cache	Point-of-Sale Terminal Configuration Store
Use Scenario: Serving as fast scratchpad memory for 8/16-bit microcontrollers in vending machines and kiosks with aging hardware platforms. IC Role / Device Role / Timing Role: Pin-compatible SRAM replacement for obsolete 28-pin DIP memories, interfacing directly with Z80, 8051, or 68000-family buses. Use Value: TTL-compatible I/O and 70 ns timing allow drop-in replacement without PCB redesign or firmware modification.	Use Scenario: Storing tax tables, pricing rules, and user preferences in retail terminals where firmware updates occur infrequently but data persistence is critical. IC Role / Device Role / Timing Role: Nonvolatile configuration store backed by supercapacitor or lithium battery during main power interruptions. Use Value: Verified +2.0V data-hold threshold ensures reliable retention across wide temperature swings (0–70°C) in uncontrolled retail environments.

Industrial PLC Memory Buffer

Medical Device Data Logger

Use Scenario: Storing real-time sensor readings and configuration parameters in programmable logic controllers with intermittent power cycles.

IC Role / Device Role / Timing Role: Byte-accessible static RAM providing deterministic 70 ns read/write latency for deterministic scan-cycle execution.

Use Value: Zero-refresh operation and +2.0V data hold ensure uninterrupted data integrity during brief AC outages or scheduled maintenance shutdowns.

Use Scenario: Capturing patient vital signs in portable ECG monitors requiring long-term battery operation between charges.

IC Role / Device Role / Timing Role: Low-power memory buffer holding waveform samples prior to wireless transmission or SD card storage.

Use Value: 0.05 µA standby current extends coin-cell life beyond 5 years while preserving last-recorded diagnostics upon power loss.

Legacy Embedded Controller Cache

Point-of-Sale Terminal Configuration Store

Use Scenario: Serving as fast scratchpad memory for 8/16-bit microcontrollers in vending machines and kiosks with aging hardware platforms.

IC Role / Device Role / Timing Role: Pin-compatible SRAM replacement for obsolete 28-pin DIP memories, interfacing directly with Z80, 8051, or 68000-family buses.

Use Value: TTL-compatible I/O and 70 ns timing allow drop-in replacement without PCB redesign or firmware modification.

Use Scenario: Storing tax tables, pricing rules, and user preferences in retail terminals where firmware updates occur infrequently but data persistence is critical.

IC Role / Device Role / Timing Role: Nonvolatile configuration store backed by supercapacitor or lithium battery during main power interruptions.

Use Value: Verified +2.0V data-hold threshold ensures reliable retention across wide temperature swings (0–70°C) in uncontrolled retail environments.

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 organization, 10 ns access, 3.3V supply only, 44-pin TSOP.	Requires bus-width adaptation (16-bit vs. 8-bit) and voltage translation; unsuitable for 5V-only legacy designs.	Select only if migrating to 3.3V systems and needing higher bandwidth; not pin-compatible with M5M5256DFP-70G#BM.
CY62256ELL-70SNXC	32K × 8 organization, 70 ns access, +5V supply, 28-pin SOIC; identical pinout and timing.	Same footprint and electrical behavior; qualified for extended temperature range (−40°C to +85°C) and higher reliability screening.	Preferred for new designs requiring automotive or extended-temperature qualification; pin-for-pin functional replacement.

Compared with IS61LV25616AL-10TLI and CY62256ELL-70SNXC, the M5M5256DFP-70G#BM offers proven 5V TTL compatibility and legacy SOP packaging, while CY62256ELL-70SNXC provides broader temperature support and enhanced reliability-making it the strongest alternative for industrial upgrades.

Availability

M5M5256DFP-70G#BM is available at Aetrix Electronics and suitable for industrial PLC memory buffers, medical data loggers, legacy embedded controller caches, and point-of-sale terminal configuration stores requiring stable component supply across long production lifecycles.

Supply support for M5M5256DFP-70G#BM 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 delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and enterprise applications.

The M5M5256DFP-70G#BM belongs to Renesas' legacy CMOS SRAM product line, designed specifically for cost-sensitive, low-power, 5V embedded systems requiring simple, reliable, no-refresh memory with minimal external support circuitry.

FAQ

What is the maximum access time specification for the M5M5256DFP-70G#BM?

The M5M5256DFP-70G#BM has a maximum access time of 70 ns, measured as address access time (t_AA) and read cycle time (t_CR) under Vcc = 5V ±10%, Ta = 25°C. This value is guaranteed across the full commercial temperature range (0°C to +70°C) and defines the minimum time required between address assertion and valid data output during read operations. The M5M5256DFP-70G#BM meets this spec without requiring wait states in 14 MHz bus systems.

Does the M5M5256DFP-70G#BM support battery backup operation?

Yes, the M5M5256DFP-70G#BM supports battery backup via its data-hold function, which maintains stored memory contents at a minimum supply voltage of +2.0V. When Vcc drops below normal operating range but remains ≥2.0V, the device enters standby mode with Icc ≤ 0.05 µA (typ), preserving data without external circuitry. This feature is explicitly characterized in the Power Down Characteristics section of the Renesas datasheet for M5M5256DFP-70G#BM.

Is the M5M5256DFP-70G#BM pin-compatible with other 28-pin SRAMs?

The M5M5256DFP-70G#BM follows the industry-standard 28-pin SRAM pinout for 32K × 8 devices, including identical A0–A14, DQ1–DQ8, /S, /W, /OE, Vcc, and GND assignments. It is pin-compatible with CY62256ELL-70SNXC and compatible with legacy boards designed for 28-pin 5V SRAMs such as HM62256 or uPD41256. However, always verify /S-/W-/OE timing margins against target system waveforms before substitution.

What are the DC input voltage thresholds for /S, /W, and /OE on the M5M5256DFP-70G#BM?

For the M5M5256DFP-70G#BM, VIH (high-level input voltage) is 2.2V minimum and VIL (low-level input voltage) is 0.8V maximum, consistent with TTL logic families. These thresholds apply to all control inputs: /S, /W, and /OE. Input currents remain within ±1 µA across the full 0–70°C range, ensuring robust noise margin and compatibility with standard 5V microcontroller GPIO outputs without external pull-ups or level shifters.

Can the M5M5256DFP-70G#BM operate reliably at 4.5V supply?

Yes, the M5M5256DFP-70G#BM is fully specified for Vcc = 4.5V to 5.5V per its Absolute Maximum Ratings and DC Electrical Characteristics. At 4.5V, access time remains within 70 ns (with minor degradation), standby current stays ≤ 0.05 µA (typ), and TTL-compatible I/O thresholds are maintained. All timing parameters-including t_su(A), t_hold(D), and t_rec(W)-are guaranteed across this range, making the M5M5256DFP-70G#BM suitable for systems with loosely regulated 5V rails.

M5M5256DFP-70G#BM Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Programmable:: Not Verified

Memory Type:: -

Memory Format:: -

Technology:: -

Memory Size:: -

Memory Organization:: -

Memory Interface:: -

Clock Frequency:: -

Write Cycle Time - Word, Page:: -

Access Time:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

M5M5256DFP-70G#BM FAQ

1.How can I place an order for M5M5256DFP-70G#BM through Aetrix?

Please submit a Request for Quotation (RFQ) for M5M5256DFP-70G#BM 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-70G#BM reliable?

The price and inventory of M5M5256DFP-70G#BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M5M5256DFP-70G#BM is usually 5 days.

3.What payment methods are accepted for M5M5256DFP-70G#BM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M5M5256DFP-70G#BM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M5M5256DFP-70G#BM?

M5M5256DFP-70G#BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M5M5256DFP-70G#BM 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-70G#BM?

For technical support, including M5M5256DFP-70G#BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M5M5256DFP-70G#BM requirements.

6.How does Aetrix verify that M5M5256DFP-70G#BM is sourced from the original manufacturer or authorized distributors?

All M5M5256DFP-70G#BM 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-70G#BM meets industry standards.

7.What is the process for return or replacement of M5M5256DFP-70G#BM?

All M5M5256DFP-70G#BM units undergo pre-shipment inspection (PSI). If there is an issue with M5M5256DFP-70G#BM, 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-70G#BM part is unused and in its original packaging.

Return procedure for M5M5256DFP-70G#BM:

1.Submit a request within 90 days.

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

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