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80386DX
32-Bit Microprocessor
62 104
63 103
Logic Diagram
FEATURES:
• 32-Bit microprocessor
• RAD-PAK® radiation-hardened against natural space radia-
tion
• Total dose hardness:
- >100 Krad (Si), dependent upon space mission
• Single event effect:
- SELTH = 37-60 MeV/mg/cm2
- SEUTH = 3.4 MeV/mg/cm2
- SEU Cross section 1E-3 cm2/bit
• Package:
- 164 Pin RAD-PAK® quad flat pack
• 8, 16, 32-Bit data types
• 8 general purpose 32-Bit registers
• Hardware debugging support
• Very large address space:
- 4 gigabyte physical
- 64 terabyte Virtual
- 4 gigabyte maximum segment size
• Integrated memory management unit
- Virtual memory support
- Four levels of protection
- Fully compatible with 80C286
• Optimized for system development
- Pipelined instructions
- On-chip caches support address translation
- 32 megabytes/sec bus bandwidth
DESCRIPTION:
Maxwell Technologies’ 80386DX high performance 32-bit
microprocessor features a geater than 100 krad (Si) total dose
tolerance, dependent upon space mission. It is designed for
very high performance and multitasking operating systems.
The integrated memory management and protection architec-
ture includes address translation registers, multitasking hard-
ware and a protection mechanism to support operating
systems. The 80386DX allows simultaneous running of multi-
ple operations. In addition, the 80386DX is capable of execu-
tion at sustained rates of between 3 and 4 million instructions
per second. It offers new testability and debugging features,
including a self-test and direct access to the page translation
cache.
Maxwell Technologies' patented RAD-PAK® packaging technol-
ogy incorporates radiation shielding in the microcircuit pack-
age. It eliminates the need for box shielding while providing
the required radiation shielding for a lifetime in orbit or space
mission. In a GEO orbit, RAD-PAK provides greater than 100
krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.
1000557
12.17.01 Rev1
(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
All data sheets are subject to change without notice 1
©2001 Maxwell Technologies
All rights reserved.

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32-Bit Microprocessor
80386DX
TABLE 1. 80386DX PIN DESCRIPTION
PIN SYMBOL
DESCRIPTION
1-7, 9, 10, 12, 13, 16, 17, 20, A16-A11, A9, A10, A7, A8, A5, A6, Address Bus
21, 24, 146-149, 152-154, 156- A3, A4, A2, A31-A28, A27-A25,
159, 161-163
A23-A22, A20-A18
8, 18, 19, 22, 23, 25, 28-30, 33,
36, 38-40, 47, 48, 65, 66, 68,
73, 76, 77, 82, 84, 86, 88, 103,
106, 107, 114, 125, 126, 129,
130,133, 134, 145, 155, 160,
164
NC Not Connected
11, 15, 27, 32, 35, 43, 51, 53,
55, 57, 61, 70, 92, 95, 100, 111,
118, 122, 138, 142, 151
VSS Ground
14, 26, 31, 34, 44, 50, 52, 54,
56, 58, 62, 69, 91, 96, 99, 110,
117, 137, 141, 150,
VCC Power Supply
37 INTR Interupt Request
41 NMI Non-Maskable Interupt Request
42
PEREQ
Processor Extension Request
45
ERROR
Error Status
46
RESET
Reset
49
BUSY
Busy Status
59
LOCK
Bus Lock
60 W/R Write/ Read
63 M/IO Memory I/O
64 D/C Data Control
67, 71, 72, 74
BE2, BE0, BE3, BE1
Byte Enables
78
BS16
Bus Size 16
75 NA Next Address
79
HOLD
Bus Hold Request
80
CLK2
CPU Clock 2
81 ADS Address Staus
83
READY
Bus Ready Input
85, 87, 89, 90, 93, 94, 97, 98,
102, 104, 105, 108, 109, 112,
113, 115, 116, 119, 120, 121,
123, 124, 127, 128, 131, 132,
135, 136, 139, 140, 143, 144,
D1, D2, D4, D0, D6, D3, D8, D5, D7, Data Bus
D10, D9, D12, D11, D14, D13, D15,
D16, D18, D17, D20, D22, D19,
D24, D21, D25,D23, D27, D26, D29,
D28, D31, D30,
101
HLDA
Bus Hold Acknowledge
1000557
12.17.01 Rev1
All data sheets are subject to change without notice 2
©2001 Maxwell Technologies
All rights reserved.

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32-Bit Microprocessor
80386DX
TABLE 2. 80386DX ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
MIN
Supply Voltage with Respect to Ground
Voltage on other pins
Thermal Impedance
Operating Temperature Range (Ambient)
Storage Temperature Range (Ambient)
VSS -0.5
-0.5
ΘJC --
TA -55
TS -65
MAX
6.5
VCC +0.5
1.79
125
150
UNIT
V
V
°C/W
°C
°C
PARAMETER
ICC
ILI
ILO
TABLE 3. DELTA LIMITS
VARIATION
±10% of specified value in Table 4
±10% of specified value in Table 4
±10% of specified value in Table 4
TABLE 4. 80386DX RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
MIN
MAX
Digital Supply Voltage
Input Low Voltage
Input High Voltage
CLK2 Input Low Voltage
CLK2 Input High Voltage
Operating Temperature Range
VCC 4.75 5.25
VIL -- 0.8
VIH 2.0
--
VILC -- 0.8
VIHC VCC - 0.8
--
TA -55 +125
UNIT
V
V
V
V
V
°C
PARAMETER
TABLE 5. 80386DX DC ELECTRICAL CHARACTERISTICS
(VCC = +5V ±5%; TA = -55°C TO +125°C, UNLESS OTHERWISE SPECIFIED)
SYMBOL
CONDITION
MIN
Input Leakage Current
Output Leakage Current
Output Low Voltage
Output High Voltage
ILI All pins except BS16, PEREQ, BUSY, and ERROR
0V < VIN < VCC
ILO 0.45V < VOUT < VCC
VOL IOL = 4 mA: A2 - A31, D0 - D31
IOL = 5 mA: BE0 - BE3, W/R, D/C, M/IO, LOCK, ADS, HLDA
VOH IOH = 1 mA: A2 - A31, D0 - D31
IOH = 0.9 mA: BE0 - BE3, W/R, D/C, M/IO, LOCK, ADS,
HLDA
-15
-15
--
--
2.4
2.4
MAX UNIT
+15 µ A
+15 µ A
0.45 V
0.45
-- V
--
1000557
12.17.01 Rev1
All data sheets are subject to change without notice 3
©2001 Maxwell Technologies
All rights reserved.

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32-Bit Microprocessor
80386DX
PARAMETER
TABLE 5. 80386DX DC ELECTRICAL CHARACTERISTICS
(VCC = +5V ±5%; TA = -55°C TO +125°C, UNLESS OTHERWISE SPECIFIED)
SYMBOL
CONDITION
MIN
Power Supply Current
Input Leakage Current
CLK2 Capacitance3
Input or I/O Capacitance1
Output Capacitance1
ICC CLK2 = 32 MHz with 16 MHz Processor
CLK2 = 32 MHz with 20 MHz Processor
CLK2 = 32 MHz with 25 MHz Processor
IIH PEREQ Pin1
IIL BS16, BUSY, ERROR Pins2
CCLK FC = 1 MHz
CIN FC = 1 MHz
COUT FC = 1 MHz
--
--
--
--
--
--
--
--
1. VIH = 2.4V. PEREQ input has an internal pulldown resistor.
2. VIL = 0.45V. BS16, BUSY and ERROR inputs have an internal pulldown resistor.
3. Guaranteed by design.
MAX UNIT
460 mA
550
680
200 µ A
-400 µ A
20 pF
20 pF
25 pF
TABLE 6. 80386DX AC ELECTRICAL CHARACTERISTICS
(VCC = +5V ±10%; VPP = VSS; TA = -55°C TO +125°C, UNLESS OTHERWISE SPECIFIED)
PARAMETER
SYMBOL
CONDITION
MIN
Operating Frequency
-16
-20
-25
-- Half of CLK2 Frequency
4
4
4
CLK2 Period
-16
-20
-25
t1
31
25
20
CLK2 High Time
-16
-20
-25
t2a at 2V
9
8
7
CLK2 High Time1
-16
-20
-25
t2b at (VCC - 0.8V)
5
5
4
CLK2 Low Time
-16
-20
-25
CLK2 Low Time1
-16
-20
-25
t3a at 2V
t3b at (VCC - 0.8V)
9
8
7
7
6
5
MAX
16
20
25
125
125
125
--
--
--
--
--
--
--
--
--
--
--
--
UNIT
MHz
ns
ns
ns
ns
ns
1000557
12.17.01 Rev1
All data sheets are subject to change without notice 4
©2001 Maxwell Technologies
All rights reserved.

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32-Bit Microprocessor
80386DX
TABLE 6. 80386DX AC ELECTRICAL CHARACTERISTICS
(VCC = +5V ±10%; VPP = VSS; TA = -55°C TO +125°C, UNLESS OTHERWISE SPECIFIED)
PARAMETER
SYMBOL
CONDITION
MIN
CLK2 Fall Time1
-16
-20
-25
t4 (VCC - 0.8V) to 0.8V
--
--
--
CLK2 Rise Time1
-16
-20
-25
t5 0.8V to (VCC - 0.8V)
--
--
--
A2 - A31 Valid Delay
-16
-20
-25
t6 CL = 120pF (CL = 50pF for 25 MHz)
4
4
4
A2 - A31 Float Delay1, 2
-16
-20
-25
t7
4
4
4
BE0 - BE3, LOCK Valid Delay
-16
-20
-25
BE0 - BE3, LOCK Float Delay1, 2
-16
-20
-25
t8 CL = 75pF (CL = 50pF for 25 MHz)
t9
4
4
4
4
4
4
W/R, M/IO, D/C and ADS Valid Delay
-16
-20
-25
t10 CL = 75pF (CL = 50pF for 25 MHz)
6
6
4
W/R, M/IO, D/C and ADS Float Delay1, 2
-16
-20
-25
t11
6
6
4
D0 - D31 Valid Delay
-16
-20
-25
D0 - D31 Float Delay1, 2
-16
-20
-25
t12 CL = 120pF (CL = 50pF for 25 MHz)
t13
4
4
7
4
4
4
HLDA Valid Delay
-16
-20
-25
t14 CL = 75pF (CL = 50pF for 25 MHz)
6
6
4
MAX
8
8
7
8
8
7
36
30
21
40
32
30
36
30
24
40
32
30
33
28
21
35
30
30
48
38
27
35
27
22
323
28
22
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1000557
12.17.01 Rev1
All data sheets are subject to change without notice 5
©2001 Maxwell Technologies
All rights reserved.