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Renesas M5M5256DFP-70XG#BM
- Part No.:
- M5M5256DFP-70XG#BM
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
M5M5256DFP-70XG#BM.pdf
- Description:
- STANDARD SRAM, 32KX8
- Quantity:
- Payment:
- Shipping:
Inventory:5,715
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Product details
Overview
M5M5256DFP-70XG#BM from Renesas is a 262,144-bit (32,768 × 8) CMOS static RAM in 28-pin 450-mil SOP package, operating on single +5V supply with 70 ns access time, TTL-compatible I/O, and battery backup support down to +2.0 V. It serves as non-refreshing, low-power memory in embedded controllers and instrumentation systems requiring direct bus interfacing.
For engineers reviewing the M5M5256DFP-70XG#BM datasheet, M5M5256DFP-70XG#BM pinout, M5M5256DFP-70XG#BM application, or M5M5256DFP-70XG#BM equivalent, key selection criteria include its /S-/W-/OE three-control logic, 0.05 µA typical standby current at Vcc = 5.5 V, and compatibility with legacy 8-bit data buses in industrial control modules.
Technical Context
This SRAM implements a resistive-load NMOS cell array with CMOS periphery for 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, and high-impedance states without clocks or refresh cycles.
The device supports two write modes (/S-controlled and /W-controlled), requires no address hold during read, and maintains data integrity at Vcc ≥ 2.0 V-enabling seamless transition to battery backup during main power loss in safety-critical monitoring units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32,768 words × 8 bits = 262,144 bits; supports byte-wide parallel data access without interleaving. |
| Access time | 70 ns max at Vcc = 5V ±10%; determines minimum bus cycle duration in microcontroller memory interfaces. |
| Standby current | 0.05 µA typical at Vcc = 5.5 V; enables multi-year battery backup in always-on sensor nodes. |
| Supply voltage | +5.0 V ±10% (4.5–5.5 V); compatible with standard TTL/CMOS logic rails and legacy 5 V systems. |
| Data retention voltage | +2.0 V minimum; allows uninterrupted memory hold during brown-out or controlled power-down sequences. |
| Input compatibility | TTL-compatible inputs (VIH = 2.2 V min, VIL = 0.8 V max); eliminates level-shifting in mixed-logic designs. |
| Output drive | IOH = –1 mA, IOL = 2 mA; sufficient to drive 10 TTL loads or terminate short PCB traces without buffers. |
Pinout & Package
Package: 28-pin plastic SOP (450 mil width), outline 28P2W-C, body size 18.4 mm × 7.6 mm × 2.35 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; tri-stated when /OE = high or /S = high, enabling OR-tie expansion. |
| /S | Chip select | Active-low enable; places device in standby (Icc ≤ 40 µA) when high, disabling all internal activity. |
| /W | Write enable | Active-low write control; latches data on trailing edge of /W or /S, whichever occurs first. |
| /OE | Output enable | Active-low output gate; isolates DQ pins from bus contention during writes or chip deselection. |
| Vcc | Power supply | +5 V supply pin; powers both core and I/O circuits; decoupling capacitor required within 10 mm. |
| GND | Ground reference | Signal and power ground return; must be connected to low-impedance plane to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| No clock or refresh required | Asynchronous operation simplifies timing design and eliminates refresh overhead in real-time firmware. |
| Three-state outputs with OR-tie capability | Enables memory expansion up to 64K×8 using multiple chips sharing DQ lines and /S daisy-chaining. |
| Direct TTL compatibility | Eliminates external level shifters when interfacing with 8051, Z80, or 68K-family microcontrollers. |
| Battery backup support | Retains data at Vcc ≥ 2.0 V, allowing integration with coin-cell backup circuits in portable diagnostics tools. |
| Low active current | 50 mA max at 70 ns access ensures thermal stability in sealed enclosures without forced air cooling. |
Applications
| Industrial PLC Memory Buffer | Medical Device Data Logger |
|---|---|
Use Scenario: Stores real-time sensor readings and alarm history in programmable logic controllers during runtime and power interruption. IC Role / Device Role / Timing Role: Non-volatile buffer holding 32 KB of operational logs; accessed via 8-bit parallel bus synchronized to CPU wait-state logic. Use Value: 70 ns access time aligns with 12 MHz 8051-based controller bus cycles; 0.05 µA standby enables >5-year coin-cell backup life. |
Use Scenario: Captures ECG waveform snapshots and patient metadata in portable diagnostic monitors with intermittent power. IC Role / Device Role / Timing Role: Primary working memory for acquisition firmware; retains critical last-recorded data during battery swap or AC dropout. Use Value: Data hold at +2.0 V ensures zero data loss during 100 ms power gap; TTL compatibility avoids signal conditioning on compact PCBs. |
| Point-of-Sale Terminal Cache | Avionics Maintenance Recorder |
Use Scenario: Temporarily caches transaction records and receipt templates in retail terminals before flash write or network upload. IC Role / Device Role / Timing Role: High-speed scratchpad memory mapped into microcontroller address space; accessed in burst mode during print spooling. Use Value: 50 mA active current supports sustained 10 MB/s throughput; /OE-controlled tristate prevents bus conflicts during USB host handshaking. |
Use Scenario: Buffers flight parameter telemetry in certified maintenance recorders where deterministic latency and data integrity are mandatory. IC Role / Device Role / Timing Role: Deterministic-access memory for ARINC-429 or MIL-STD-1553 interface buffering; isolated by /S during bus arbitration. Use Value: 40 µA max standby current meets DO-160E Section 20 thermal limits; -40°C to +85°C rating validated for cockpit mounting. |
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 | 16-bit bus width, 10 ns access, 3.3 V only; no battery backup below 2.7 V. | Requires bus-width adaptation and level translation in 5 V systems; unsuitable for brown-out hold. | Select only if migrating to 3.3 V architecture and higher bandwidth is prioritized over legacy compatibility. |
| AS6C4008-70PCN | Same 8-bit bus, 70 ns access, 5 V supply; but 10 µA standby (200× higher than M5M5256DFP-70XG#BM). | Limited battery backup duration; requires larger backup cells or frequent replacement in field-deployed units. | Acceptable for mains-powered applications where standby current is non-critical, but not for long-term battery operation. |
Compared with IS61LV25616AL-10TLI and AS6C4008-70PCN, the M5M5256DFP-70XG#BM uniquely balances 5 V TTL compatibility, ultra-low 0.05 µA standby, and proven +2.0 V data retention-making it irreplaceable in cost-sensitive, battery-backed 8-bit embedded memory designs.
Availability
M5M5256DFP-70XG#BM is available at Aetrix Electronics and suitable for industrial PLC memory buffers, medical device data loggers, point-of-sale terminal caches, and avionics maintenance recorders requiring stable component supply across extended product lifecycles.
Supply support for M5M5256DFP-70XG#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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.
The M5M5256DFP-70XG#BM belongs to Renesas' legacy CMOS SRAM product line designed for cost-effective, low-power, pin-compatible memory upgrades in 5 V embedded systems with strict reliability and longevity requirements.
FAQ
What is the maximum operating temperature range for the M5M5256DFP-70XG#BM?
The M5M5256DFP-70XG#BM is rated for operation from 0°C to +70°C, as confirmed in the "Operating Temperature" section of the Renesas datasheet. This commercial-grade specification makes it suitable for indoor industrial equipment and consumer-grade instrumentation, but not for under-hood automotive or extended-temperature outdoor deployments.
Does the M5M5256DFP-70XG#BM support true battery backup mode?
Yes, the M5M5256DFP-70XG#BM supports true battery backup: it retains stored data at supply voltages as low as +2.0 V, verified in the "Power Down Characteristics" section. This enables integration with lithium coin cells (e.g., CR2032) to preserve memory contents during main power failure without external supervision circuitry.
Can the M5M5256DFP-70XG#BM be used with a 3.3 V microcontroller interface?
No-the M5M5256DFP-70XG#BM is strictly a 5 V device with TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and 5 V output swing. Direct connection to 3.3 V logic risks overvoltage damage to the microcontroller's I/O pins and violates absolute maximum ratings; level translation is mandatory.
What is the function of the /S pin during write operations on the M5M5256DFP-70XG#BM?
On the M5M5256DFP-70XG#BM, the /S (chip select) pin must be low to enable any internal operation-including write cycles. A write is executed only when /S and /W are simultaneously low; if /S goes high during /W low, the output remains high-impedance and no write occurs, preventing unintended data corruption.
Is the M5M5256DFP-70XG#BM pin-compatible with other variants in the M5M5256D family?
Yes-the M5M5256DFP-70XG#BM shares identical 28-pin SOP pinout and signal mapping with M5M5256DFP-55LL, -70LL, and -55XL variants. Differences are limited to access time (55 ns vs. 70 ns) and temperature grade; no PCB redesign is needed when substituting within the same FP package suffix.
M5M5256DFP-70XG#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-70XG#BM FAQ
1.How can I place an order for M5M5256DFP-70XG#BM through Aetrix?
Please submit a Request for Quotation (RFQ) for M5M5256DFP-70XG#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-70XG#BM reliable?
The price and inventory of M5M5256DFP-70XG#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-70XG#BM is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M5M5256DFP-70XG#BM transactions.
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Once your M5M5256DFP-70XG#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-70XG#BM?
For technical support, including M5M5256DFP-70XG#BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M5M5256DFP-70XG#BM requirements.
6.How does Aetrix verify that M5M5256DFP-70XG#BM is sourced from the original manufacturer or authorized distributors?
All M5M5256DFP-70XG#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-70XG#BM meets industry standards.
7.What is the process for return or replacement of M5M5256DFP-70XG#BM?
All M5M5256DFP-70XG#BM units undergo pre-shipment inspection (PSI). If there is an issue with M5M5256DFP-70XG#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-70XG#BM part is unused and in its original packaging.
Return procedure for M5M5256DFP-70XG#BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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