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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 |
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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.
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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. |
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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. |
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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 |
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Note:
8xC251SA/SB/SP/SQ: up to 16 MHz (speed);
8xC251TA/TB/TP/TQ: up to 24 MHz (speed) plus 2nd UART capability
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The 8xC251 microcontrollers are available in 40-pin PDIP and 44-pin PLCC packages. |
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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. |
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