Intel386™ EX Embedded
Microprocessor
Dat ash e et
Pr oduct Features
This datashe et a pplies to devices marked EXTB and EXTC. If you require information about
devices marked EXSA or EXTA, refe r to a pre vious re vision of this datasheet, order number
272420-004.
■ Sta tic Intel386™ CPU Core
—Low Power Consumption
—Operat ing P ower Supply
EXTB: 2.7 V to 3.6 V
EXTC: 4.5 V to 5.5 V
—Operat ing F requenc y
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
■ Transp a r en t Pow er -m an a ge ment S y ste m
Ar c hi t ect u r e
—Intel System Management Mode
Architecture Extension for Truly
Compatible Systems
—Power Management Transparent to
Operating Systems and Application
Programs
—Programmable Power-management
Modes
■ Powerdown Mode
—Clock Stopping at Any T im e
—Only 10–20 µA Typical CPU Sink
Current
■ Full 32-bit Internal A rchitecture
—8-, 16-, 32-bit Data Types
—8 General Pur pose 32-bit Register s
■ Runs Int el386 Architect ure Software in a
Cost-effective 16-bi t Hardware
Environment
—Runs Same Applicati ons and Operating
Syste ms as the Int el386 SX and I nte l386
DX Processors
—Object Code Com patible with 8086,
80186, 80286, and Intel386 Proces sors
■ High-performance 16-bit Dat a Bus
—Two-clock Bus Cycles
—Addres s Pipelining Al lows Use of
Slower, Inexpensive Mem ories
■ Extended Te mper ature Range
■ Integrated Memory Management Unit
—Virtual Memory Support
—Optional On-chip Paging
—4 Levels of Hardwa re-enforced
Protection
—MMU Fully Compa tible with MMUs of
the 80286 and Int el386 DX Processors
■ Virtual 8086 Mode Allows Execut ion of
8086 S oftware in a Prot ected and Paged
System
■ Large U n ifo rm Address Space
—64 Megabyte Phys ical
—64 Terabyte Virtual
—4 Gigabyte Maximum Segment Size
■ On-chip Debugging Support Inc luding
Br eakpoint Registers
■ Comp lete System Development Supp ort
■ High S peed CHMOS Technology
■ Two Package Types
—132-pin Plastic Quad Flatpack
—144-pin Thin Quad Flat pack
■ Integrated Peripheral Functions
—Clock and Power Management Unit
—Chip-select Unit
—Interrupt Control Unit
—Timer/Counter Unit
—Watchdog Timer Unit
—Asynchronous Serial I/O Unit
—Syn chronous Se rial I/O Unit
—Pa r allel I/O Unit
—DMA and Bus Arbiter Unit
—Refresh Control Unit
—JTAG-compliant Test-logic Unit
Order Num be r : 27 24 20 -007
October 1998
