Renesas M5M5256DFP-70LL#BM

Overview

M5M5256DFP-70LL#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 TTL-compatible I/O, three-state outputs, and battery backup capability down to +2.0V. It delivers 70 ns access time, 0.05 µA typical standby current, and supports non-volatile data retention during power failure-ideal for embedded memory subsystems requiring simple interface and low-power hold.

For engineers reviewing the M5M5256DFP-70LL#BM datasheet, M5M5256DFP-70LL#BM pinout, M5M5256DFP-70LL#BM application, or M5M5256DFP-70LL#BM equivalent, key selection criteria include /S-/W-/OE control timing compatibility, 28-pin SOP footprint constraints, 70 ns read/write cycle timing margins, and battery-backed standby operation at Vcc ≥ 2.0 V.

Technical Context

This SRAM implements asynchronous, dual-control write (/S & /W overlap) and output-enable (/OE) logic with high-impedance bus isolation. Its architecture uses resistive-load NMOS memory cells with CMOS periphery, enabling high density and ultra-low standby current without refresh clocks.

It supports two operational modes: /S-controlled (chip-select dominant) and /W-controlled (write-strobe dominant), each with distinct timing requirements for setup/hold, enable/disable, and recovery. Data retention at +2.0V Vcc enables seamless battery backup during main power loss.

Key Specifications

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.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar static RAM applications.

Compared with IS61LV25616AL-10TLI, M5M5256DFP-70LL#BM offers native 5V operation and 28-pin SOP compatibility but lower density; versus AS6C4008-70SCN, it provides superior standby current (0.05 µA vs. 1 µA) at identical speed and footprint-critical for battery-critical applications.

Availability

M5M5256DFP-70LL#BM is available at Aetrix Electronics and suitable for industrial PLC memory buffers, medical device parameter storage, and legacy HMI display buffers requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for M5M5256DFP-70LL#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 series belongs to Renesas' legacy CMOS SRAM product line, designed specifically for cost-sensitive, low-power, 5V embedded systems requiring reliable asynchronous memory with battery backup capability.

FAQ

What is the maximum operating temperature range for the M5M5256DFP-70LL#BM?

The M5M5256DFP-70LL#BM is rated for operation from 0°C to +70°C, as indicated by the "LL" suffix in its part number. This commercial-grade temperature range is validated per Renesas' DC and AC electrical specifications, including 70 ns access time and 0.05 µA standby current, across the full span. It is not qualified for extended industrial (–40°C to +85°C) operation like the -70LLI variant.

Does the M5M5256DFP-70LL#BM support true battery backup mode with data retention below 5V?

Yes, the M5M5256DFP-70LL#BM supports data retention down to +2.0V Vcc, as specified in its Power Down Characteristics table. When /S is held high and Vcc drops to ≥2.0V, the device enters standby with Icc ≤ 0.05 µA typical, preserving stored data without external circuitry-enabling direct coin-cell backup without regulators or switches.

Can the M5M5256DFP-70LL#BM be used in a /W-controlled write mode only, ignoring /S?

No-the M5M5256DFP-70LL#BM requires /S to be low for any write or read operation. The function table confirms that /S must be low (L) for both Write and Read modes; when /S is high, the device enters Non-selection or Stand-by mode regardless of /W or /OE state. /S is mandatory for chip activation.

What is the pin 1 marking and orientation for the M5M5256DFP-70LL#BM SOP package?

The M5M5256DFP-70LL#BM uses a standard 28-pin plastic SOP (450 mil) with pin 1 located at the top-left corner when the notch or index mark is oriented upward. Pin numbering proceeds counter-clockwise: pin 1 (A14), pin 2 (A12), ..., pin 14 (GND), pin 15 (Vcc), ..., pin 28 (/S). The package outline is designated 28P2W-C per Renesas documentation.

Is the M5M5256DFP-70LL#BM RoHS compliant and lead-free?

Yes, the M5M5256DFP-70LL#BM is RoHS compliant and lead-free, consistent with Renesas' transition to green manufacturing completed prior to 2006. The "#BM" suffix denotes tape-and-reel packaging with Pb-free terminations and halogen-free molding compound, meeting JEDEC J-STD-609 Category 1 requirements.