Intel386™ EX Embedded
Microprocessor
Datasheet
Product Features
■ Static Intel386™ CPU Core
—Low Power Consumption
—Operating Power Supply
EXTB: 2.7 V to 3.6 V
■ Extended Temperature Range
■ Integrated Memory Management Unit
—Virtual Memory Support
—Optional On-chip Paging
—4 Levels of Hardware-enforced
Protection
—MMU Fully Compatible with MMUs of
the 80286 and Intel386 DX Processors
EXTC: 4.5 V to 5.5 V
—Operating Frequency
20 MHz EXTB at 2.7 V to 3.6 V
25 MHz EXTB at 3.0 V to 3.6 V;
25/33 MHz EXTC at 4.5 V to 5.5 V
■ Virtual 8086 Mode Allows Execution of
8086 Software in a Protected and Paged
System
■ Large Uniform Address Space
—64 Megabyte Physical
■ Transparent Power-management System
Architecture
—Intel System Management Mode
Architecture Extension for Truly
Compatible Systems
—Power Management Transparent to
Operating Systems and Application
Programs
—64 Terabyte Virtual
—4 Gigabyte Maximum Segment Size
■ On-chip Debugging Support Including
Breakpoint Registers
—Programmable Power-management
Modes
■ Complete System Development Support
■ High Speed CHMOS Technology
■ Two Package Types
■ Powerdown Mode
—Clock Stopping at Any Time
—Only 10–20 µA Typical CPU Sink
Current
—132-pin Plastic Quad Flatpack
—144-pin Thin Quad Flatpack
■ Integrated Peripheral Functions
—Clock and Power Management Unit
—Chip-select Unit
■ Full 32-bit Internal Architecture
—8-, 16-, 32-bit Data Types
—8 General Purpose 32-bit Registers
—Interrupt Control Unit
—Timer/Counter Unit
—Watchdog Timer Unit
—Asynchronous Serial I/O Unit
—Synchronous Serial I/O Unit
—Parallel I/O Unit
—DMA and Bus Arbiter Unit
—Refresh Control Unit
■ Runs Intel386 Architecture Software in a
Cost-effective 16-bit Hardware
Environment
—Runs Same Applications and Operating
Systems as the Intel386 SX and Intel386
DX Processors
—Object Code Compatible with 8086,
80186, 80286, and Intel386 Processors
—JTAG-compliant Test-logic Unit
■ High-performance 16-bit Data Bus
—Two-clock Bus Cycles
—Address Pipelining Allows Use of
Slower, Inexpensive Memories
This datasheet applies to devices marked EXTB and EXTC. If you require information about
devices marked EXSA or EXTA, refer to a previous revision of this datasheet, order number
272420-004.
Order Number: 272420-007
October 1998
INTEL [ INTEL ]
