GENERAL DESCRIPTION
This data sheet details the specific properties of the PCF84C21A, PCF84C41A and PCF84C81A. The shared properties of the PCF84CxxxA family of microcontrollers are described in the “PCF84CxxxA family” data sheet which should be read in conjunction with this publication.

FEATURES
• Manufactured in silicon gate CMOS process
• 8-bit CPU, ROM, RAM, I/O in a 28-lead package
• 2 kbyte ROM, 64 byte RAM (PCF84C21A)
• 4 kbyte ROM, 128 byte RAM (PCF84C41A)
• 8 kbyte ROM, 256 byte RAM (PCF84C81A)
• I2C-bus interface with multi-master capability
• Over 100 instructions (based on MAB8048) all of 1 or 2 cycles
• 20 quasi-bidirectional I/O Port lines
• High sink current capability on the 8 lines of Port 1
• 8-bit programmable timer/event counter 1
• 3 single-level vectored interrupts:
    – external
    – 8-bit programmable timer/event counter 1
    – I2C-bus
• Two test inputs, one of which also serves as the external interrupt input
• Stop and Idle modes
• Supply voltage: 2.5 to 5.5 V
• Clock frequency: 1 to 16 MHz
• Operating temperature: −40 to +85 °C.