I2C bus controller with a parallel port — what it bridges
The NXP PCF8584T/2,512 is an I2C bus controller that translates between a standard parallel microprocessor interface and the I2C serial bus. It handles all I2C bus timing and protocol, including clock generation, start/stop conditions, and arbitration, so the host processor only needs to read and write a few registers. The parallel interface makes it a direct fit for legacy 8-bit or 16-bit microcontrollers that lack a built-in I2C peripheral, or for adding a second I2C bus to an existing system without redesigning the core logic.
Supply and temperature — what the ratings mean for the BOM
The 4.5V to 5.5V supply range ties this part to 5V logic families. It will not run from a 3.3V rail, so if your system has moved to lower voltages, you will need a level shifter or a separate 5V supply for this controller. The 1.5mA supply current is modest — fine for always-on buses in industrial controllers or set-top boxes, but not the lowest-power option for battery gear. The -40°C to 85°C industrial temperature range covers factory-floor enclosures, outdoor telecom cabinets, and automotive cabin applications without needing a mil-grade part.
Lifecycle and sourcing — still an active line
The PCF8584T/2,512 carries an Active product status and is ROHS3 compliant. NXP has not issued an EOL notice for this order code, so it remains a standard catalog item for new designs and production replenishment. Availability is confirmed through independent distribution; current pricing and lead time are quoted to order against an RFQ. No direct replacement or second-source alternate is listed in the official records, so dual-sourcing will require a pin-compatible part from another vendor — something to verify against your specific layout.
Package and handling — 20-SOIC wide-body
The wide SOIC footprint is common for I2C controllers and interface ICs, and it is straightforward to hand-assemble or reflow. Standard MSL precautions apply — store the tubes in a dry environment if the seal is broken, and bake before reflow if the floor-life window has been exceeded.