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Introduction

The PSD4XX family is a microcontroller peripheral that integrates high-performance and user-configurable blocks of EPROM, programmable logic, and SRAM into one part. The PSD4XX products also provide a powerful microcontroller interface that eliminates the need for external “glue logic”. The no “glue logic” concept provides a user-programmable interface to a variety of 8- and 16-bit (multiplexed or non-multiplexed) microcontrollers that is easy to use. The part’s integration, small form factor, low power consumption, and ease of use make it the ideal part for interfacing to virtually any microcontroller.

The PSD4XX provides two Zero-power PLDs (ZPLD): a Decode PLD (DPLD) and a General-purpose PLD (GPLD). A configuration bit (Turbo) can be set by the MCU, and will automatically place the ZPLDs into Standby Mode if no inputs are changing. The ZPLDs are designed to consume minimum power using Zero-power CMOS technology that uses only 10 μA (typical) standby current. Unused product terms are automatically disabled, also reducing power, regardless of the Turbo bit setting

FEATURES SUMMARY

■ Single Supply Voltage:

– 5 V±10 for PSD4XX

– 2.7 to 5.5 V for PSD4XX-V

■ Up to 1 Mbit of UV EPROM

■ Up to 16 Kbit SRAM

■ Input Latches

■ Programmable I/O ports

■ Page Logic

■ Programmable Security