PSD854F2-70J

Overview

The PSD854F2-70J is a Flash In-System Programmable (ISP) peripheral IC designed for 8-bit microcontrollers. Manufactured by STMicroelectronics, it features dual-bank flash memory with up to 2 Mbit of primary storage and 256 Kbit of secondary memory, enabling concurrent read and erase/write operations. The device includes 256 Kbit of battery-backed SRAM and 27 reconfigurable I/O ports. It integrates a PLD with over 3000 gates, supporting CPLD and DPLD configurations. The component operates at a speed grade of 70 MHz and is housed in a 52-PLCC package.

Feature Summary

• Dual-bank flash memory architecture allowing concurrent operation
• Integrated PLD with over 3000 gates and 27 reconfigurable I/O ports
• In-system programming capability via built-in JTAG serial port
• 256 Kbit battery-backed SRAM for data retention

Applications

• Flash In-System Programmable peripherals for 8-bit MCUs
• MCU I/O expansion and address output latching
• Special function I/O applications
• CPLD and DPLD logic implementation

Procurement Notes

Verify the specific speed grade suffix '70' against the official datasheet to confirm the operating frequency. Confirm the 52-PLCC package dimensions match the design footprint requirements. Ensure the supplier provides genuine STMicroelectronics components with traceability documentation.

Selection Notes

Select this component when designing systems requiring flexible I/O expansion and non-volatile memory for 8-bit microcontrollers. The integrated PLD functionality reduces external logic requirements. Verify that the target MCU supports the required ISP interface protocols for programming the device.

Part Context

This part belongs to the PSD8xx series of programmable peripherals from STMicroelectronics. These devices are designed to extend the capabilities of 8-bit microcontrollers by providing additional memory, I/O ports, and programmable logic functions within a single integrated circuit.

Replacement Considerations

Check for other speed grades within the PSD854 family, such as the PSD854F2, which may offer different performance characteristics. Verify pin compatibility and electrical specifications before substituting with similar programmable peripheral ICs.