Intel386TM EX Embedded
Microprocessor
Datasheet
Product Features
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.
s
Static Intel386TM CPU Core
-- Low Power Consumption
-- Operating Power Supply
EXTB: 2.7 V to 3.6 V
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
s
Transparent Power-management System
Architecture
-- Intel System Management Mode
Architecture Extension for Truly
Compatible Systems
-- Power Management Transparent to
Operating Systems and Application
Programs
-- Programmable Power-management
Modes
s
Powerdown Mode
-- Clock Stopping at Any Time
-- Only 1020 A Typical CPU Sink
Current
s
Full 32-bit Internal Architecture
-- 8-, 16-, 32-bit Data Types
-- 8 General Purpose 32-bit Registers
s
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
s
High-performance 16-bit Data Bus
-- Two-clock Bus Cycles
-- Address Pipelining Allows Use of
Slower, Inexpensive Memories
s
Extended Temperature Range
s
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
s
Virtual 8086 Mode Allows Execution of
8086 Software in a Protected and Paged
System
s
Large Uniform Address Space
-- 64 Megabyte Physical
-- 64 Terabyte Virtual
-- 4 Gigabyte Maximum Segment Size
s
On-chip Debugging Support Including
Breakpoint Registers
s
Complete System Development Support
s
High Speed CHMOS Technology
s
Two Package Types
-- 132-pin Plastic Quad Flatpack
-- 144-pin Thin Quad Flatpack
s
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
-- Synchronous Serial I/O Unit
-- Parallel I/O Unit
-- DMA and Bus Arbiter Unit
-- Refresh Control Unit
-- JTAG-compliant Test-logic Unit
Order Number: 272420-007
October 1998
Datasheet
Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Intel's Terms and Conditions of Sale for such products, Intel assumes no liability
whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of Intel products including liability or warranties relating to
fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Intel products are not
intended for use in medical, life saving, or life sustaining applications.
Intel may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Intel reserves these for
future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them.
The Intel386TM EX Microprocessor may contain design defects or errors known as errata which may cause the product to deviate from published
specifications. Current characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature may be obtained by calling 1-800-
548-4725 or by visiting Intel's website at http://www.intel.com.
Copyright Intel Corporation, 1998
*Third-party brands and names are the property of their respective owners.
Datasheet
3
Intel386TM EX Embedded Microprocessor
Contents
1.0
Introduction
.................................................................................................................. 7
2.0
Pin Assignment
........................................................................................................... 8
3.0
Pin Description
.......................................................................................................... 12
4.0
Functional Description
........................................................................................... 19
4.1
Clock Generation and Power Management Unit ................................................. 19
4.2
Chip-select Unit ................................................................................................... 19
4.3
Interrupt Control Unit ........................................................................................... 19
4.4
Timer/Counter Unit .............................................................................................. 20
4.5
Watchdog Timer Unit........................................................................................... 20
4.6
Asynchronous Serial I/O Unit ..............................................................................20
4.7
Synchronous Serial I/O Unit ................................................................................ 21
4.8
Parallel I/O Unit ................................................................................................... 21
4.9
DMA and Bus Arbiter Unit ................................................................................... 21
4.10
Refresh Control Unit............................................................................................22
4.11
JTAG Test-logic Unit ........................................................................................... 22
5.0
Design Considerations
..........................................................................................23
5.1
Instruction Set ..................................................................................................... 23
5.2
Component and Revision Identifiers ................................................................... 24
5.3
Package Thermal Specifications .........................................................................24
6.0
Electrical Specifications
........................................................................................ 27
6.1
Maximum Ratings................................................................................................ 27
6.2
DC Specifications ................................................................................................ 28
6.3
AC Specifications ................................................................................................ 30
7.0
Bus Cycle Waveforms
............................................................................................47
Figures
1
Intel386TM EX Embedded Processor Block Diagram ............................................ 7
2
Intel386TM EX Embedded Processor 132-Pin PQFP Pin Assignment .................. 8
3
Intel386TM EX Embedded Processor 144-Pin TQFP Pin Assignment................. 10
4
Maximum Case Temperature vs. Frequency for Typical Power Values
(132-lead PQFP, V
cc
= 5.5 V) ............................................................................. 25
5
Maximum Case Temperature vs. Frequency for Typical Power Values
(144-lead TQFP, V
cc
= 5.5 V nominal) ................................................................ 25
6
Maximum Case Temperature vs. Frequency for Typical Power Values
(132-lead PQFP, V
cc
= 3.6 V) ............................................................................. 26
7
Maximum Case Temperature vs. Frequency for Typical Power Values
(144-lead TQFP, V
cc
= 3.6 V)..............................................................................26
8
Drive Levels and Measurement Points for AC Specifications (EXTC) ................ 30
9
Drive Levels and Measurement Points for AC Specifications (EXTB) ................ 31
10
AC Test Loads..................................................................................................... 42
Intel386TM EX Embedded Microprocessor
4
Datasheet
11
CLK2 Waveform .................................................................................................. 42
12
AC Timing Waveforms -- Input Setup and Hold Timing ..................................... 43
13
AC Timing Waveforms -- Output Valid Delay Timing ......................................... 44
14
AC Timing Waveforms -- Output Valid Delay Timing for
External Late READY#........................................................................................ 44
15
AC Timing Waveforms -- Output Float Delay and HLDA Valid Delay Timing .... 45
16
AC Timing Waveforms -- RESET Setup and Hold Timing and Internal Phase .. 45
17
AC Timing Waveforms -- Relative Signal Timing ............................................... 46
18
AC Timing Waveforms -- SSIO Timing .............................................................. 46
19
AC Timing Waveforms -- Timer/Counter Timing ................................................ 46
20
Basic Internal and External Bus Cycles .............................................................. 47
21
Nonpipelined Address Read Cycles.................................................................... 48
22
Pipelined Address Cycle ..................................................................................... 49
23
16-bit Cycles to 8-bit Devices (using BS8#) ........................................................ 50
24
Basic External Bus Cycles .................................................................................. 51
25
Nonpipelined Address Write Cycles .................................................................... 52
26
Halt Cycle ............................................................................................................ 53
27
Basic Refresh Cycle ............................................................................................ 54
28
Refresh Cycle During HOLD/HLDA .................................................................... 55
29
LOCK# Signal During Address Pipelining ........................................................... 56
30
Interrupt Acknowledge Cycles............................................................................. 56
Tables
1
132-Pin PQFP Pin Assignment ............................................................................. 9
2
144-Pin TQFP Pin Assignment ........................................................................... 11
3
Pin Type and Output State Nomenclature .......................................................... 12
4
Intel386TM EX Microprocessor Pin Descriptions ................................................. 13
5
Microprocessor Clocks Per Instruction................................................................ 23
6
Thermal Resistances (0C/W)
JA
,
JC
................................................................ 24
7
5 V Intel386 EXTC Processor Maximum Ratings ............................................... 27
8
3 V Intel386 EXTB Processor Maximum Ratings................................................ 27
9
5-Volt DC Characteristics .................................................................................... 28
10
3-Volt DC Characteristics .................................................................................... 29
11
5-Volt AC Characteristics .................................................................................... 32
12
3-Volt AC Characteristics .................................................................................... 37
Datasheet
5
Intel386TM EX Embedded Microprocessor
Revision History
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.
Revision
Date
Description
007
10/98
The document was updated to the larger page size. All known device errata for
the datasheet have been incorporated into this new revision.
006
5/96
Corrections added.
005
12/95
This datasheet applied to the new EXTB and EXTC devices.
004
9/94
This datasheet applied to devices marked EXSA or EXTA.
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