The Intel 8xC251TB/TQ and 8xC251SA/SB/SP/SQ are based on the new high performance MCS® 251 micro-controller architecture. Being members of the MCS 251 microcontroller family, the 8xC251TB/TQ and 8xC251SA/SB/SP/SQ have the same advanced register based CPU architecture and a pipelined instruction execution unit. They use the powerful MCS 251 microcontroller instruction set, with many enhanced 8, 16 and 32-bit instructions available. The new microcontrollers are also specially designed to execute C code efficiently. Most importantly, the 8xC251TB/TQ and 8xC251SA/SB/SP/SQ are binary code and pin compatible with the
existing MCS 51 microcontrollers. They represent the easiest way to upgrade performance of existing MCS 51 microcontroller applications, delivering up to 15 times the performance.
8xC251SA/SB/SP/SQ
The 8xC251SA/SB/SP/SQ features a rich combination of integrated peripherals that make it an even more powerful microcontroller. The Programmable Counter Array (PCA) provides the flexibility for applications that require real time compare/capture, high speed I/O and pulse width modulation capabilities. Also included is an enhanced serial port for multi-processor communications, a hardware watch dog timer, a program lock scheme for on-chip program memory and two power saving modes: idle mode and power down mode. The 8xC251SA/SB/SP/SQ has 1 Kbyte or 512 bytes on-chip data RAM and is available with 16 Kbytes or 8 Kbytes of on-chip OTPROM (87C251SA/SB/SP/SQ), or ROM (83C251SA/SB/SP/SQ), or ROMless (80C251SB/SQ) options. The 8xC251SA/SB/SP/SQ operates from static standby to 16 MHz clock frequency and is available in 44-pin PLCC and 40-pin package options.
8xC251TB/TQ
The 8xC251TB/TQ is based on the MCS 251 microcontroller architecture and has ALL of the 8xC251SA/SB/SP/SQ peripheral features plus a 2nd programmable serial I/O port (UART). In addition, the 8xC251TB/TQ microcontroller can perform up to 24 MHz frequency and maintains pin and code compatibility with MCS 51/251 microcontrollers. Similar with the 8xC251SA/SB/SP/SQ, the 8xC251TB/TQ has 512 bytes or 1Kbyte of on-chip data RAM options, ROMless, and is available in 44LD PLCC and 40LD PD1P package options.
Flexible RAM and ROM
MCS 251 microcontrollers are available as standard 5V 16 MHz or 24 MHz parts and are available in commercial as well as extended temperature range.
Product options are: 8xC251SA: 8K ROM/OTPROM and 1K RAM 8xC251SB: 16K ROM/OTPROM and 1K RAM 8xC251SP: 8K ROM/OTPROM and 512B RAM 8xC251SQ: 16K ROM/OTPROM and 512B RAM 8OC251TB: ROMless and 1K RAM 8OC251TQ: ROMless and 512B RAM 83C251TB: 16K ROM and 1K RAM
ROMless versions are also available
Note:
8xC251SA/SB/SP/SQ: up to 16 MHz (speed);
8xC251TA/TB/TP/TQ: up to 24 MHz (speed) plus 2nd UART capability
Packaging
The 8xC251 microcontrollers are available in 40-pin PDIP and 44-pin PLCC packages.
Fast, Easy Development
Intel and its third party vendors offer a variety of hardware and software development tools to make your MCS 251 controller development as fast as possible.
8xC251SA: 8K ROM/OTPROM and 1K RAM