My Inquiry
My Account
Renesas M5M5256DFP-55LL#SM
- Part No.:
- M5M5256DFP-55LL#SM
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
M5M5256DFP-55LL#SM.pdf
- Description:
- STANDARD SRAM, 32KX8
- Quantity:
- Payment:
- Shipping:
Inventory:70,845
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
M5M5256DFP-55LL#SM 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 battery-backup capability down to +2.0 V. It serves as non-refresh, low-power main memory in embedded controllers and instrumentation systems requiring deterministic timing and bus contention control.
For engineers reviewing the M5M5256DFP-55LL#SM datasheet, M5M5256DFP-55LL#SM pinout, M5M5256DFP-55LL#SM application, or M5M5256DFP-55LL#SM equivalent, key selection criteria include access time consistency across temperature, standby current ≤0.05 µA at Vcc=5.5 V, /OE-controlled three-state outputs for bus sharing, and /S-/W dual-control write/read mode compatibility with legacy 8-bit microprocessor buses.
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, standby, and high-impedance modes without clocks or refresh cycles.
The device supports two write control modes (/W- or /S-driven), enforces strict setup/hold timing for address and data relative to /W and /S edges, and maintains data hold at Vcc ≥2.0 V-enabling seamless transition to battery backup during main power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32,768 words × 8 bits = 262,144 bits; supports byte-wide data bus interfacing with 80C85, Z80, or 68000-family CPUs. |
| Access time | 55 ns max at Vcc = 5V ±10%, Ta = 0–70°C; ensures reliable timing margin in 18 MHz CPU bus environments. |
| Standby current | 0.05 µA typical at Vcc = 5.5 V; enables >1-year battery life in coin-cell-backed real-time clock or configuration memory applications. |
| Supply voltage | +5 V ±10% (4.5–5.5 V); compatible with standard TTL logic rails and industrial power supplies. |
| Data retention voltage | +2.0 V minimum; guarantees nonvolatile data hold during brown-out or controlled power-down sequences. |
| Input compatibility | TTL-level inputs (VIH = 2.4 V min, VIL = 0.8 V max); eliminates need for level-shifting when interfacing with legacy microcontrollers. |
| Output drive | IOH = –1 mA (VOH ≥ 2.4 V), IOL = 2 mA (VOL ≤ 0.4 V); sufficient to drive 10 TTL loads or parallel bus segments. |
Pinout & Package
Package: 28-pin plastic SOP (450 mil width), outline 28P2W-C, 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; tri-stated when /OE = high or /S = high, enabling OR-tie expansion. |
| /S | Chip select | Active-low enable; places device in standby (Icc ≤ 0.05 µA) when high, disabling all outputs and internal activity. |
| /W | Write enable | Active-low write strobe; initiates write cycle only when overlapped with active /S; latches data on trailing edge. |
| /OE | Output enable | Active-low output gate; overrides /W to force high-impedance state, preventing bus contention during writes. |
| Vcc | Power supply | +5 V supply pin; decoupling capacitor (0.1 µF) required within 10 mm for stable AC operation. |
| GND | Ground reference | Signal and power ground common point; must be connected before Vcc during power-up sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| No refresh required | Asynchronous static architecture eliminates external refresh circuitry, reducing BOM count and system complexity. |
| Battery backup support | Valid data retention at Vcc ≥ +2.0 V enables direct connection to backup lithium coin cell without diode or regulator. |
| Three-state outputs with /OE priority | /OE forces high-Z regardless of /W or /S state, allowing safe shared-bus arbitration in multi-SRAM systems. |
| Direct TTL compatibility | All inputs meet VIH/VIL specs of standard TTL; outputs drive full TTL fan-out-no interface logic needed. |
| Low active current | Icc1 ≤ 45 mA max at 55 ns access (TTL-level inputs); enables use in thermally constrained industrial enclosures. |
Applications
| Industrial PLC Memory Buffer | Medical Device Configuration Store |
|---|---|
Use Scenario: Storing I/O mapping tables and runtime parameters in programmable logic controllers with 24 V DC field power and isolated 5 V logic rails. IC Role / Device Role / Timing Role: Byte-accessible nonvolatile shadow RAM holding firmware-configurable register sets between power cycles. Use Value: 55 ns access ensures sub-cycle response to ladder logic scan interrupts; 0.05 µA standby draws <1 µW from backup supercapacitor during mains outage. | Use Scenario: Retaining calibration coefficients and patient history logs in portable ECG monitors powered by rechargeable Li-ion batteries. IC Role / Device Role / Timing Role: Primary configuration memory mapped into microcontroller's external bus space, accessed during boot and calibration routines. Use Value: Data hold at +2.0 V allows uninterrupted retention during battery swap or deep-sleep mode; SOP package fits compact 4-layer PCB layouts. |
| Automotive Body Control Module | Test Equipment Firmware Cache |
Use Scenario: Caching lighting sequence patterns and door lock status in 12 V automotive BCMs with wide-temperature operation requirements. IC Role / Device Role / Timing Role: External memory extension for 8-bit MCU lacking on-chip RAM, interfaced via dedicated address/data bus. Use Value: Rated for 0–70°C operation with guaranteed 55 ns timing across full range; /S-controlled standby reduces quiescent draw below 10 µA during sleep mode. | Use Scenario: Holding instrument firmware patches and calibration vectors in benchtop oscilloscopes and signal generators with FPGA-based control planes. IC Role / Device Role / Timing Role: Fast-access instruction/data cache for FPGA soft-core processors executing real-time measurement algorithms. Use Value: 55 ns access time matches FPGA I/O timing budgets; three-state outputs allow dynamic reconfiguration of memory banks without bus contention. |
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, 3.3 V supply only; no +5 V or battery-backup support. | Requires level translation and redesign for 5 V systems; unsuitable for battery-retention use cases. | Select only if migrating to 3.3 V architecture and needing wider data bus. |
| AS6C4008-55PCN | Same 32K × 8 organization and 55 ns speed, but 5 V-only operation and 1 µA standby (vs. 0.05 µA). | Higher standby current limits battery life in long-duration backup scenarios; otherwise pinout-identical. | Acceptable drop-in replacement where backup duration <1 month is acceptable. |
Compared with IS61LV25616AL-10TLI and AS6C4008-55PCN, the M5M5256DFP-55LL#SM uniquely combines 5 V operation, 55 ns timing, and ultra-low 0.05 µA standby-making it the only choice for legacy 5 V systems requiring multi-year battery-backed memory retention.
Availability
M5M5256DFP-55LL#SM is available at Aetrix Electronics and suitable for industrial PLC memory buffers, medical device configuration stores, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for M5M5256DFP-55LL#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-55LL#SM belongs to Renesas' legacy CMOS SRAM product line designed for cost-sensitive, reliability-critical embedded systems requiring zero-refresh, wide-voltage, and long-term data retention capabilities.
FAQ
What is the maximum operating temperature range for the M5M5256DFP-55LL#SM?
The M5M5256DFP-55LL#SM is rated for operation from 0°C to +70°C. This commercial-grade temperature range is specified in the Absolute Maximum Ratings table and confirmed in the AC Electrical Characteristics section for the -55LL speed grade. It does not support extended industrial (-40°C to +85°C) operation like the -70LLI variant.
Does the M5M5256DFP-55LL#SM require an external clock or refresh signal?
No, the M5M5256DFP-55LL#SM is a true static RAM and requires neither an external clock nor periodic refresh cycles. Its operation is fully asynchronous and controlled solely by /S, /W, and /OE signals. This eliminates timing-critical refresh overhead and simplifies system design for microcontrollers without dedicated DRAM controllers.
Can the M5M5256DFP-55LL#SM retain data when powered by a 2.0 V backup source?
Yes, the M5M5256DFP-55LL#SM guarantees data retention at Vcc ≥ +2.0 V, as documented in the Power Down Characteristics section. This enables direct connection to a lithium coin cell or supercapacitor for nonvolatile storage during main power failure, with no additional voltage regulation or switching circuitry required.
What is the function of the /OE pin on the M5M5256DFP-55LL#SM?
The /OE (output enable) pin on the M5M5256DFP-55LL#SM directly controls the output buffer state. When /OE is high, all DQ pins enter high-impedance mode-even during active /S and /W conditions-preventing bus contention. When /OE is low and /S is low, data appears on DQ pins after the specified ta(OE) delay. This prioritized control is essential for shared-bus systems.
Is the M5M5256DFP-55LL#SM pin-compatible with other variants in the M5M5256DFP,VP family?
Yes, the M5M5256DFP-55LL#SM shares identical pinout, package (28-pin SOP), and functional interface with all M5M5256DFP,VP variants including -70LL, -55XL, and -70XL. Speed grades differ only in access time and current specs; no PCB layout change is needed when substituting within the FP package group.
M5M5256DFP-55LL#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-55LL#SM FAQ
1.How can I place an order for M5M5256DFP-55LL#SM through Aetrix?
Please submit a Request for Quotation (RFQ) for M5M5256DFP-55LL#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-55LL#SM reliable?
The price and inventory of M5M5256DFP-55LL#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-55LL#SM is usually 5 days.
3.What payment methods are accepted for M5M5256DFP-55LL#SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M5M5256DFP-55LL#SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M5M5256DFP-55LL#SM?
M5M5256DFP-55LL#SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M5M5256DFP-55LL#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-55LL#SM?
For technical support, including M5M5256DFP-55LL#SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M5M5256DFP-55LL#SM requirements.
6.How does Aetrix verify that M5M5256DFP-55LL#SM is sourced from the original manufacturer or authorized distributors?
All M5M5256DFP-55LL#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-55LL#SM meets industry standards.
7.What is the process for return or replacement of M5M5256DFP-55LL#SM?
All M5M5256DFP-55LL#SM units undergo pre-shipment inspection (PSI). If there is an issue with M5M5256DFP-55LL#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-55LL#SM part is unused and in its original packaging.
Return procedure for M5M5256DFP-55LL#SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M5M5256DFP-55LL#SM Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
