The PCF8584 is an integrated circuit designed in CMOS technology which serves as an interface between most standard parallel-bus microcontrollers/microprocessors and the serial I2C-bus. The PCF8584 provides both master and slave functions. Communication with the I2C-bus is carried out on a byte-wise basis using interrupt or polled handshake. It controls all the I2C-bus specific sequences, protocol, arbitration and timing. The PCF8584 allows parallel-bus systems to communicate bidirectionally with the I2C-bus.

The PCF8593 is a CMOS1 clock and calendar circuit, optimized for low power consumption. Addresses and data are transferred serially via the two-line bidirectional 2C-bus. The built-in word address register is incremented automatically after each written or read data byte. The built-in 32.768 kHz oscillator circuit and the first 8 bytes of the RAM are used for the clock, calendar, and counter functions. The next 8 bytes can be programmed as alarm registers or used as free RAM space.

These Power MOSFETs are designed using STMicroelectronics' consolidated striplayout-based MESH OVERLAY? process. The result is a product that matches or improves on the performance of comparable standard parts from other manufacturers.

? High performance RISC CPU ? Only 35 single word instructions to learn ? All single cycle instructions except for program branches which are two cycle ? Operating speed: DC - 20 MHz clock input DC - 200 ns instruction cycle ? 4 K x 14 words of Program Memory, 192 x 8 bytes of Data Memory (RAM) ? Interrupt capability ? Eight-level deep hardware stack ? Direct, indirect and relative addressing modes ? Power-on Reset (POR) ? Power-up Timer (PWRT) and Oscillator Start-up Timer (OST) ? Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation ? Programmable code protection ? Power-saving SLEEP mode ? Selectable oscillator options ? Low power, high speed CMOS EPROM technology ? Wide operating voltage range: 2.5V to 5.5V ? High Sink/Source Current 25/25 mA ? Commercial, Industrial and Automotive temperature ranges ? Low power consumption:

? High-performance RISC CPU ? Only 35 single word instructions to learn ? All single cycle instructions except for program branches which are two cycle ? Operating speed: DC - 20 MHz clock input DC - 200 ns instruction cycle ? Up to 8K x 14 words of Program Memory, up to 368 x 8 bytes of Data Memory (RAM) ? Interrupt capability ? Eight level deep hardware stack ? Direct, indirect, and relative addressing modes ? Power-on Reset (POR) ? Power-up Timer (PWRT) and Oscillator Start-up Timer (OST) ? Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation ? Programmable code-protection ? Power saving SLEEP mode ? Selectable oscillator options ? Low-power, high-speed CMOS EPROM technology ? Fully static design