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Renesas M5M5256DFP-70XG#SM
- Part No.:
- M5M5256DFP-70XG#SM
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
M5M5256DFP-70XG#SM.pdf
- Description:
- STANDARD SRAM, 32KX8
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
M5M5256DFP-70XG#SM from Renesas is a 262,144-bit (32,768-word × 8-bit) CMOS static RAM in 28-pin SOP package, operating on single +5V supply with no clock or refresh required. It features 70 ns access time, 0.05 µA typical standby current, TTL-compatible I/O, and battery backup capability down to +2.0 V - ideal for low-power embedded memory subsystems in industrial controllers.
For engineers reviewing the M5M5256DFP-70XG#SM datasheet, M5M5256DFP-70XG#SM pinout, M5M5256DFP-70XG#SM application, or M5M5256DFP-70XG#SM equivalent, key selection criteria include /S-/W-/OE control timing, 28-pin SOP footprint compatibility, +2.0 V data retention, three-state OR-tie support, and 70 ns read/write cycle performance under 5V±10% operation.
Technical Context
This SRAM implements asynchronous, dual-control write (/S & /W overlap) and read (/W high, /OE low, /S low) modes via discrete enable logic. Its resistive-load NMOS cell array paired with CMOS periphery delivers high density and ultra-low standby current without sacrificing TTL-level drive strength or noise immunity.
The device supports power-down operation with data hold at VCC ≥ 2.0 V and exhibits guaranteed timing across 0–70°C ambient. All inputs meet VIH = 2.2 V min / VIL = 0.8 V max; outputs deliver VOH = 2.4 V min (IOH = –1 mA) and VOL = 0.4 V max (IOL = 2 mA), ensuring robust bus interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32,768 words × 8 bits = 262,144 bits; supports byte-wide data bus interface without external multiplexing. |
| Access time | 70 ns max at Vcc = 5V ±10%; defines minimum read cycle time for synchronous system integration. |
| Standby current | 0.05 µA typical at Vcc = 5.5 V; enables multi-year battery backup in power-fail scenarios. |
| Data retention voltage | +2.0 V minimum; allows use of small coin-cell backup without regulator circuitry. |
| Input compatibility | TTL-compatible inputs (VIH ≥ 2.2 V, VIL ≤ 0.8 V); eliminates level-shifting in legacy 5V microcontroller systems. |
| Output drive | IOH = –1 mA / IOL = 2 mA; sufficient to drive 10 TTL loads or 50 pF bus capacitance directly. |
| Operating temperature | 0°C to +70°C; qualified for commercial/industrial control environments without derating. |
Pinout & Package
Package: 28-pin plastic SOP (450 mil width), outline 28P2C-A, body size 18.4 mm × 7.6 mm × 2.45 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 control; enables shared bus topology via /OE. |
| /S | Chip select | Active-low enable; high-impedance output and reduced Icc when deasserted - essential for memory expansion. |
| /W | Write enable | Active-low write strobe; latches data on trailing edge (whichever of /W or /S goes high first). |
| /OE | Output enable | Independent three-state control; prevents bus contention during writes even if /S remains active. |
| Vcc | Power supply | +5V ±10% single supply; no auxiliary voltages or regulators needed. |
| GND | Ground reference | Common return for all signals and power; decoupling capacitor placement critical near Pin 14. |
Key Features
| Feature | Design Value |
|---|---|
| No clock or refresh required | Asynchronous operation simplifies timing design and eliminates refresh overhead in microcontroller-based systems. |
| Direct TTL compatibility | Eliminates level shifters in 5V logic families, reducing BOM count and PCB area in legacy designs. |
| Battery backup capability | Retains data at Vcc ≥ +2.0 V, enabling seamless transition to backup power during main supply interruption. |
| Three-state outputs with OR-tie support | Allows multiple devices to share a common data bus without external bus transceivers. |
| Low active current (50 mA max) | Enables use in power-constrained applications such as portable instrumentation and remote sensors. |
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: Non-volatile buffer memory holding operational state during brief AC outages; accessed asynchronously by ARM Cortex-M3 host. Use Value: 0.05 µA standby current extends coin-cell life beyond 10 years; 70 ns access meets scan-cycle timing budgets under 10 kHz update rates. | Use Scenario: Capturing ECG waveform snapshots in battery-powered diagnostic handhelds requiring data persistence across sleep/wake transitions. IC Role / Device Role / Timing Role: High-reliability scratchpad memory interfaced to 8-bit ADC and low-power MCU; retains data during deep-sleep mode. Use Value: +2.0 V data retention enables direct connection to 3.0 V Li-ion battery backup; TTL compatibility avoids signal conditioning in analog front-end domain. |
| Point-of-Sale Terminal Cache | Avionics Maintenance Recorder |
Use Scenario: Caching transaction logs and firmware patch segments in retail terminals deployed in unconditioned environments. IC Role / Device Role / Timing Role: Byte-accessible SRAM used for fast write-through caching between flash storage and ARM9 application processor. Use Value: 70 ns read/write timing supports burst transfers up to 14 MB/s; 0–70°C rating ensures reliability in kiosk enclosures exposed to sunlight. | Use Scenario: Recording flight parameter telemetry in certified avionics black box recorders where data integrity must survive extended power loss. IC Role / Device Role / Timing Role: Critical-path memory storing last 30 seconds of sensor data prior to crash; powered by isolated backup supply. Use Value: Guaranteed data hold at +2.0 V meets DO-160 Section 22 transient drop requirements; SOP package supports conformal coating for humidity resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS61LV25616AL-70TQLI | 16-bit bus width (256K × 16), 70 ns access, 3.3 V only, 44-pin TSOP | Requires bus-width adaptation and level translation in 5V systems; higher density but incompatible voltage domain. | Select only when migrating to 3.3 V architecture and needing wider data path. |
| AS6C4008-70ZIN | Same 32K × 8 organization, 70 ns, +5 V, 28-pin SOJ; 1 µA standby (vs. 0.05 µA) | Higher standby current reduces battery lifetime; SOJ package requires different reflow profile and inspection. | Consider for drop-in replacement where board layout accommodates SOJ and backup runtime >1 year is acceptable. |
Compared with IS61LV25616AL-70TQLI and AS6C4008-70ZIN, the M5M5256DFP-70XG#SM uniquely combines 5V TTL compatibility, 0.05 µA standby, and SOP packaging - making it optimal for cost-sensitive, battery-backed 5V industrial designs where pin count and voltage alignment are fixed constraints.
Availability
M5M5256DFP-70XG#SM is available at Aetrix Electronics and suitable for industrial PLC memory buffers, medical data loggers, point-of-sale terminal caches, and avionics maintenance recorders requiring stable component supply across long-lifecycle programs.
Supply support for M5M5256DFP-70XG#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 delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT applications.
The M5M5256DFP-70XG#SM belongs to Renesas' legacy CMOS SRAM product line designed specifically for reliable, low-power, pin-compatible memory expansion in 5V embedded control systems.
FAQ
What is the maximum operating frequency supported by the M5M5256DFP-70XG#SM?
The M5M5256DFP-70XG#SM is an asynchronous SRAM with no internal clock; its speed is defined by access time, not frequency. With 70 ns access time, it supports read/write cycles up to approximately 14.3 MHz in worst-case continuous operation - though actual throughput depends on system-level timing margins for /S, /W, and /OE setup/hold requirements as specified in the AC characteristics table.
Does the M5M5256DFP-70XG#SM require external refresh circuitry?
No, the M5M5256DFP-70XG#SM is a static RAM and does not require any refresh circuitry. Its CMOS latch-based memory cells retain data indefinitely as long as power is applied above the data retention threshold (+2.0 V), eliminating refresh overhead and associated timing complexity found in DRAMs.
Can the M5M5256DFP-70XG#SM be used with a 3.3 V microcontroller interface?
The M5M5256DFP-70XG#SM is specified for +5 V ±10% operation and TTL-compatible input thresholds (VIH ≥ 2.2 V). While some 3.3 V MCUs may meet this VIH requirement, Renesas does not guarantee operation below Vcc = 4.5 V. For robust 3.3 V interfacing, level translation or a 3.3 V–compatible SRAM like IS61LV25616AL is recommended instead of relying on marginal voltage compatibility for the M5M5256DFP-70XG#SM.
What is the pin 1 marking method for the M5M5256DFP-70XG#SM package?
The M5M5256DFP-70XG#SM uses standard 28-pin SOP (28P2C-A) packaging with a molded index notch at the top-left corner (when leads point downward and notch faces upward). Pin 1 is located at the left end of the top row adjacent to the notch, verified per Renesas package drawing PS0061-B.
How does the /OE pin function independently of /S in the M5M5256DFP-70XG#SM?
In the M5M5256DFP-70XG#SM, /OE provides independent three-state control of the DQ bus: when /OE is high, outputs go high-impedance regardless of /S or /W state - preventing bus contention during write cycles even if /S remains asserted. This allows clean bus sharing in multi-chip memory systems without requiring precise /S timing coordination across devices.
M5M5256DFP-70XG#SM 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#SM FAQ
1.How can I place an order for M5M5256DFP-70XG#SM through Aetrix?
Please submit a Request for Quotation (RFQ) for M5M5256DFP-70XG#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-70XG#SM reliable?
The price and inventory of M5M5256DFP-70XG#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-70XG#SM is usually 5 days.
3.What payment methods are accepted for M5M5256DFP-70XG#SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M5M5256DFP-70XG#SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M5M5256DFP-70XG#SM?
M5M5256DFP-70XG#SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M5M5256DFP-70XG#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-70XG#SM?
For technical support, including M5M5256DFP-70XG#SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M5M5256DFP-70XG#SM requirements.
6.How does Aetrix verify that M5M5256DFP-70XG#SM is sourced from the original manufacturer or authorized distributors?
All M5M5256DFP-70XG#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-70XG#SM meets industry standards.
7.What is the process for return or replacement of M5M5256DFP-70XG#SM?
All M5M5256DFP-70XG#SM units undergo pre-shipment inspection (PSI). If there is an issue with M5M5256DFP-70XG#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-70XG#SM part is unused and in its original packaging.
Return procedure for M5M5256DFP-70XG#SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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