Nec B58944 Datasheet Link -

The B58944 features a standard asynchronous SRAM footprint. It separates the address bus, data bus, and control lines to ensure straightforward interfacing with 8-bit, 16-bit, or 32-bit automotive microcontrollers. Pinout Description (Standard 28-Pin SOP) Pin Number Function Type Description A0 – A14 Address Inputs : Selects one of the 32,768 memory locations. 11 - 13, 15 - 19 I/O1 – I/O8 Input/Output

: Typically +5V DC (+/- 10%) for automotive logic systems. Absolute Maximum Ratings

To download the full technical datasheet for the B58944, search for its base model number, . This document will contain the complete electrical characteristics, timing diagrams, and physical dimensions. You can find it on any major datasheet website, such as Alldatasheet.com , Datasheet4U.com , or directly from the manufacturer's (now Renesas Electronics) archive. Some specific pages to check include: nec b58944 datasheet

: Designed to retain data at very low voltages, allowing it to preserve critical adaptive data even when the vehicle's main power fluctuates.

Transmits or receives sensor signal updates and outputs commands to engine subsystems. Common Vehicle Applications The B58944 features a standard asynchronous SRAM footprint

Reading or writing the B58944 chip often requires . Using OBD tools requires backing up injector codes separately, as they can be lost during the read/write process. Specific tools recommended for this include Kess, K-TAG, CMD, and BDM100 for BDM access, while MPPS v13/v16 can be used for OBD access but increases the risk of losing injector codes.

: Active LOW. Controls the output buffers during a Read operation. 27 11 - 13, 15 - 19 I/O1 –

The engine cranks but will not fire due to a lack of communication from the ECU.

The provides the essential technical specifications for a highly specialized, proprietary automotive integrated circuit (IC) widely used as an engine driver chip in Bosch Engine Control Units (ECUs) . Commonly paired or co-marked with the memory designation D43256BGU-70Y , this surface-mount component is critical for vehicle diagnostics, engine management, and ECU repair.

(The exact unbranded native component) Alliance Memory AS6C62256-70SIN Cypress Semiconductor CY62256NLL-70SNXI

: Used by Honda, Toyota, and various global compact vehicle platforms.