Rochester Electronics NSC800N-4I

The NSC800 is an 8-bit CMOS microprocessor serving as the central processing unit in National Semiconductor's NSC800 microcomputer family. Fabricated using micro-CMOS technology, the device offers system designers performance comparable to equivalent NMOS products while providing the low-power advantages of CMOS. The device integrates multiple system functions, including vectored priority interrupts, refresh control, power-saving capability, and interrupt acknowledge. The NSC800 is available in DIP and surface-mount chip carrier packages. System designers can interface dedicated CMOS peripherals directly with the NSC800, or choose from National Semiconductor's full line of CMOS products to achieve low-power system solutions. Dedicated peripherals include the NSC810A RAM I/O Timer, NSC858 UART, and NSC831 I/O.

• Fully compatible with Z80 instruction set: includes 158 powerful instructions, 10 addressing modes, and 22 internal registers
• Low power consumption: 50mW at 5V Vcc
• Unique power-saving features
• Multiplexed bus architecture
• Reset pin with Schmitt trigger input
• On-chip bus controller and clock generator
• Variable supply voltage range: 2.4V~6.0V
• On-chip 8-bit dynamic RAM refresh circuit
• Speed: 1.0 μs instruction cycle at 4.0 MHz (NSC800-4: 4.0MHz, NSC800-35: 3.5MHz, NSC800-3: 2.5MHz, NSC800-1: 1.0 MHz)
• Addressable 64k bytes of memory and 256 I/O devices
• Five on-chip interrupt request lines