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National Semiconductors 486 Processors

 
Optimized 32-Bit 486-Class Controllers with On-Chip Peripherals for Embedded Systems
Data Bus Width 32-bit
Level 1 Cache 1 KB Instruction
Supported Memory 16 MB Physical, within the bottom 128 MB addressable.
4 GB Addressable.
Other common features
  • Intel486 instruction set compatible (protected mode only) with optimized performance
  • Industry standard interrupt controller, timers, and real time clock
  • UART with IrDA v1.0 (Infrared Data Association) port
  • Protected WATCHDOG™ timer
  • Optimized DRAM controller (Supports two banks, up to 8 MBytes each)
  • Up to nine versatile, programmable chip selects
  • Glueless interface to ISA-type peripherals
  • Arbitration support for auxiliary processor
  • Flexible, programmable, multilevel power saving modes maximize power savings
 

NS486SXF

Vcc
TA
Package
5V ± 5%
0°C - +70°C
160—pin PQFP
Features:
  • Intel 82365 compatible PCMCIA interface
  • Four external DMA channels (max. transfer rate of 25 MByte/sec @ 25 MHz) support many transfer modes
  • High performance IEEE 1284 (ECP) Bidirectional Parallel Port
  • MICROWIRE™/MICROWIRE/PLUS™/Access.bus synchronous serial interfaces
  • LCD Controller for monochrome supertwist Liquid Crystal Displays up to 480 x 320
  • Reconfigurable I/O: Up to 29 I/O pins can be used as general purpose bidirectional I/O lines
Core Speed 25MHz
NS486SXF-25

NS486SXL

Vcc
TA
Package
5V ± 5%
0°C - +70°C
132—pin PQFP
Features:
  • Up to eight external interrupts directly supported, and additional interrupt expansion through an external PIC interface
  • Support for External Bus Masters, allowing them to access DRAM and on-chip Peripherals
  • MICROWIRE™/Access.bus synchronous serial interfaces
  • Reconfigurable I/O: Up to 28 I/O pins can be used as general purpose bidirectional I/O lines
  • Programming model compatible with the NS486SXF where possible
Core Speed 25MHz NS486SXL-25