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Renesas M5M5256DFP-55XL#BM
- Part No.:
- M5M5256DFP-55XL#BM
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
M5M5256DFP-55XL#BM.pdf
- Description:
- STANDARD SRAM, 32KX8
- Quantity:
- Payment:
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Inventory:8,785
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Product details
Overview
M5M5256DFP-55XL#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 55 ns access time, TTL-compatible I/O, and three-state outputs for bus sharing - used in embedded memory subsystems requiring low-power battery backup.
For engineers reviewing the M5M5256DFP-55XL#BM datasheet, M5M5256DFP-55XL#BM pinout, M5M5256DFP-55XL#BM application, or M5M5256DFP-55XL#BM equivalent, key selection criteria include standby current (0.05 µA typ.), /OE-controlled output enable timing, /S-/W dual-control write/read mode, and +2.0V data-hold capability during power loss.
Technical Context
This SRAM implements a resistive-load NMOS cell array with CMOS periphery for high density and ultra-low standby power. It supports two write control modes (/W- or /S-driven), with address setup and hold timing validated for 55 ns operation at Vcc = 5V ±10%.
The device uses common I/O pins (DQ1–DQ8), chip-select (/S), write-enable (/W), and output-enable (/OE) to manage bus contention and memory expansion. Data retention at +2.0V enables seamless battery-backup operation without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 262,144-bit (32,768 words × 8 bits) - supports byte-wide data paths in microcontroller-based systems. |
| Access time | 55 ns max at Vcc = 5V - ensures compatibility with 18 MHz bus clocks in legacy embedded controllers. |
| Standby current | 0.05 µA typical at Vcc = 5.5V - enables multi-year battery backup in non-volatile memory retention mode. |
| Data hold voltage | +2.0V minimum - maintains stored data during brown-out or controlled power-down without external regulators. |
| I/O compatibility | TTL-level inputs and outputs - interfaces directly with 74LS/74HC logic and older microprocessor buses without level shifters. |
| Operating temperature | 0°C to +70°C - qualified for commercial-grade industrial control and instrumentation applications. |
| Package | 28-pin 450-mil SOP (Outline 28P2W-C) - surface-mount compatible with standard reflow profiles and automated assembly. |
Pinout & Package
Package: 28-pin plastic SOP (450 mil width), outline code 28P2W-C, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus supporting full 32K-word decoding; no internal latching - requires stable address before /S active. |
| DQ1–DQ8 | Bi-directional data I/O | Common data bus pins; high-impedance when /OE = H or /S = H - enables OR-tie expansion with other SRAMs. |
| /S | Chip select | Active-low enable; controls device selection and entry into standby mode (Icc ≤ 0.05 µA) when high. |
| /W | Write enable | Active-low write strobe; initiates write cycle only when overlapped with /S low - defines /W-controlled write mode. |
| /OE | Output enable | Active-low output gate; places DQ pins in high-Z state independently of /S or /W - prevents bus contention during read/write transitions. |
| Vcc | Power supply | +5V ±10% primary supply; powers core and I/O; supports data hold down to +2.0V. |
| GND | Ground reference | Signal and power ground return; must be low-inductance connection for stable 55 ns timing margins. |
Key Features
| Feature | Design Value |
|---|---|
| No clock or refresh required | True static operation eliminates timing-critical refresh cycles - simplifies controller firmware and reduces system overhead. |
| Three-state outputs with /OE control | Independent output gating allows dynamic bus arbitration without relying on /S state - critical for multi-chip memory banks. |
| Battery backup support | Valid data retention at +2.0V Vcc enables use with coin-cell backup without external voltage supervisors or switches. |
| Direct TTL compatibility | All inputs meet VIH ≥ 2.2V / VIL ≤ 0.8V; outputs drive IOH = –1mA / IOL = 2mA - interoperable with legacy 5V logic families. |
| Low active supply current | 45 mA max (TTL-level) during read/write - minimizes thermal load in compact PCB layouts with limited airflow. |
Applications
| Industrial PLC Memory Buffer | Medical Device Parameter Storage |
|---|---|
Use Scenario: Storing real-time I/O configuration and calibration tables in programmable logic controllers with intermittent power. IC Role / Device Role / Timing Role: Byte-wide static RAM providing non-refreshed, fast-access scratchpad memory mapped to microcontroller address space. Use Value: 55 ns access time meets scan-cycle timing budgets; 0.05 µA standby current extends supercapacitor hold-up time beyond 72 hours. |
Use Scenario: Retaining patient-specific therapy settings and fault logs in portable infusion pumps during battery swaps. IC Role / Device Role / Timing Role: Battery-backed SRAM holding critical configuration data across power cycles without NVRAM emulation overhead. Use Value: +2.0V data-hold threshold aligns with Li-ion battery discharge curve - preserves integrity through full 3.0V → 2.2V transition. |
| Point-of-Sale Terminal Cache | Test Equipment Firmware Patch Area |
Use Scenario: Caching transaction buffers and receipt templates in thermal receipt printers with constrained board space. IC Role / Device Role / Timing Role: Compact 28-pin SOP SRAM interfacing directly to 8-bit microcontroller data bus via common DQ lines. Use Value: 450-mil SOP footprint fits tight layout constraints; TTL compatibility avoids level-shifter components and BOM cost. |
Use Scenario: Hosting field-upgradable calibration constants and instrument-specific firmware patches in benchtop oscilloscopes. IC Role / Device Role / Timing Role: Read/write memory region accessed by host CPU during boot or service mode - requires deterministic 55 ns latency. Use Value: /OE-controlled output enable allows safe concurrent access with other peripherals on shared data bus during patch loading. |
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 (256K × 16), 10 ns access, 3.3V-only supply | Requires bus-width adaptation and level translation for 8-bit systems; unsuitable for +5V legacy designs. | Select only if migrating to 3.3V architecture and needing higher bandwidth - not drop-in for M5M5256DFP-55XL#BM. |
| AS6C4008-55PCN | Same 32K × 8 organization, 55 ns speed, +5V supply, but 28-pin SOJ package (not SOP) | Identical electrical specs and timing, but different mechanical footprint - requires PCB redesign for socket or soldering. | Valid functional alternative where SOJ mounting is acceptable; verify thermal pad clearance and reflow profile compatibility. |
Compared with IS61LV25616AL-10TLI and AS6C4008-55PCN, the M5M5256DFP-55XL#BM offers native 5V TTL compatibility and SOP packaging optimized for legacy industrial PCBs - eliminating level shifters and avoiding SOJ assembly complexity.
Availability
M5M5256DFP-55XL#BM is available at Aetrix Electronics and suitable for industrial PLC memory buffers, medical device parameter storage, and point-of-sale terminal cache requiring stable component supply and long-term lifecycle support.
Supply support for M5M5256DFP-55XL#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 is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and memory solutions for industrial, automotive, and infrastructure markets.
The M5M5256DFP-55XL#BM belongs to Renesas' legacy CMOS SRAM product line designed for cost-sensitive, reliability-critical embedded systems requiring zero-refresh operation and battery-backed data retention.
FAQ
What is the maximum access time guaranteed for M5M5256DFP-55XL#BM across its operating temperature range?
The M5M5256DFP-55XL#BM guarantees a maximum access time of 55 ns over the full 0°C to +70°C commercial temperature range, measured under Vcc = 5V ±10% and specified load conditions (CL = 50 pF). This value is validated per AC Electrical Characteristics table in the official Renesas datasheet REJ03C0055.
Does M5M5256DFP-55XL#BM support true battery backup operation, and what is the minimum Vcc for data retention?
Yes, the M5M5256DFP-55XL#BM supports true battery backup: it retains stored data down to +2.0V Vcc, as confirmed in the Power Down Characteristics section. At this voltage, standby current remains below 0.6 µA (typ.) - enabling multi-day retention on small backup cells without auxiliary circuitry.
Can M5M5256DFP-55XL#BM be used with a 3.3V microcontroller interface without level shifters?
No - the M5M5256DFP-55XL#BM is strictly a +5V device with TTL-compatible thresholds (VIH ≥ 2.2V, VIL ≤ 0.8V). Driving its inputs from a 3.3V microcontroller may violate VIL margin; likewise, its 5V outputs exceed 3.3V I/O absolute maximum ratings. Level translation is required for safe interfacing.
What is the function of the /S, /W, and /OE pins on M5M5256DFP-55XL#BM, and how do they interact during a read cycle?
During a read cycle on the M5M5256DFP-55XL#BM, /S must be low to select the device, /W must be high to disable write, and /OE must be low to enable outputs. The DQ pins then drive valid data after ta(OE) (max 5 ns). Holding /OE high places DQ in high-Z regardless of /S or /W state - preventing bus contention.
Is M5M5256DFP-55XL#BM pin-compatible with other variants in the M5M5256DFP,VP family, such as -70XL or -55LL?
Yes - all M5M5256DFP,VP variants including M5M5256DFP-55XL#BM share identical 28-pin SOP pinouts and signal assignments. Speed grades (-55XL, -70XL, -55LL, etc.) differ only in timing parameters and operating temperature ranges; no PCB change is needed when upgrading within the same package type.
M5M5256DFP-55XL#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-55XL#BM FAQ
1.How can I place an order for M5M5256DFP-55XL#BM through Aetrix?
Please submit a Request for Quotation (RFQ) for M5M5256DFP-55XL#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-55XL#BM reliable?
The price and inventory of M5M5256DFP-55XL#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-55XL#BM is usually 5 days.
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M5M5256DFP-55XL#BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M5M5256DFP-55XL#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-55XL#BM?
For technical support, including M5M5256DFP-55XL#BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M5M5256DFP-55XL#BM requirements.
6.How does Aetrix verify that M5M5256DFP-55XL#BM is sourced from the original manufacturer or authorized distributors?
All M5M5256DFP-55XL#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-55XL#BM meets industry standards.
7.What is the process for return or replacement of M5M5256DFP-55XL#BM?
All M5M5256DFP-55XL#BM units undergo pre-shipment inspection (PSI). If there is an issue with M5M5256DFP-55XL#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-55XL#BM part is unused and in its original packaging.
Return procedure for M5M5256DFP-55XL#BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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