P1750AE/SOS
P1750A, P1750A/SOS, P1750AE, &
P1750AE/SOS PROCESSORS
Pyramid Semiconductor offers four single chip MIL-STD-
1750AProcessors. Twooftheseprocessors,theP1750A
andtheP1750AEaremanufacturedwithindustrystandard
CMOSTechnology. TheP1750A/SOSandtheP1750AE/
SOSarederivativesoftheP1750AandP1750AEandare
manufacturedwithinsulatedsubstrateSilicononSapphire,
CMOS/SOS Technology to provide absolute immunity
from destructive latch up caused by the exposure of a
space vehicle to natural space radiation.
theSOSProcessorareutilizedinthedesign. Processors
manufactured with SOS Technology have higher power
requirementsand,forsomesignals,longerdelaysthanthe
standard CMOS Processors. However, both the CMOS
andCMOS/SOSProcessorsoperatetheMIL-STD-1750A
Instructions with the same number of clocks.
In space, CMOS/SOS provides absolute immunity from
destructive Single Event Latchup which can occur when
high energy ionizing particles, found naturally in space,
enter the space craft when passing through an integrated
circuit,theseparticlesintroduceenoughchargeinstandard
CMOSdevicestocauseadestructiveinternalshortcircuit
fromthedevicepowersupplythroughthestandardCMOS
substratetoground. Thislatchupcurrentcanbemorethan
the integrated circuit can safely carry and the device is
eitherseverelyweakenedreducingitsoperationallifetime
or is immediately destroyed.
The P1750AE is architecturally more efficient than the
P1750Aandprovideshigherthroughputatthesameclock
frequency. All four processors are mechanically
interchangeable, they have the same pinouts. The
processorsareelectricallyinterchangeableaslongasthe
specification limits for the slowest processor in the
interchangeabilitymatrixarenotviolated. Allfourprocessors
are stand alone single chip, fully compliant MIL-STD-
1750AProcessors.
The P1750AE is a second generation MIL-STD-1750A
Processor that has been designed as a direct ("plug in")
electrical, mechanical, and software compatible
replacementfortheP1750A. TheP1750AandtheP1750AE
are also proven replacements for other MIL-STD-1750A
Processorsthatarenolongeravailable. TheP1750AEhas
beenapplicationproveninanumberofcriticalapplications
aboardawiderangeofplatformsincludingcombataircraft,
helicopters, submarines, surfacevehicles, andsatellites.
The P1750AE operates the MIL-STD-1750A Instruction
Set in fewer "clocks" than the P1750A. Depending upon
the number of arithmetic instructions used, the P1750AE
can easily provide more than 3X the throughput of the
P1750A at the same clock frequency with the same
operationalsoftware;seeTables1and2. TheP1750Aand
P1750AE have the same bus cycle. Basic execution
instructions such as add/subtract, set/test/reset bit, load
&store,bytemanipulation,logicalOR/NAND/AND,etc.all
execute with the same number of "clocks" in both the
P1750AandP1750AE. ThestandardCMOSP1750Aand
P1750AE are specified by DSCC SMD 5962-87665.
The P1750A/SOS and P1750AE/SOS are derivatives of
the P1750A and P1750AE. These SOS processors are
targetedforuseaboardspacevehiclesandaremanufactured
with insulated substrate Silicon on Sapphire (SOS)
Technology so as to provide high tolerance to the natural
spaceradiationenvironmentwhichcandegradeordestroy
standard CMOS Technology processors. The space
radiation tolerance for the P1750AE/SOS is shown in
Table 4. The P1750A/SOS is interchangeable with the
P1750A and the P1750AE/SOS is interchangeable with
theP1750AEprovidedthattheelectricalspecificationsfor
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