CONVERTING AEROFLEX UTMC UT9Q512 SRAM into IMMUNE SRAM This appli
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Aeroflex UTMC Application Note UTXQ512-AN-000
CONVERTING AEROFLEX UTMC UT9Q512 SRAM into IMMUNE SRAM
This application note describes UT9Q512 SRAMs UT54ACS151 logic device mimic 1Mx1 SRAM. shown below, single written into three locations same. When data read out, used voting system select either output. This voting method virtually makes immune hits. Since bits word physically adjacent die, nearly impossible particle cause bits flip same word. such, would require multiple particle hits cause upset. system timing results maximum read cycle 48ns, (25ns SRAM read 23ns input better system performance Aeroflex UTMC screen memories with read cycles access times down timing analysis above assumes capacitive output loads less. system loading greater than user should consult "Operational Frequency Load Capacitance" application note calculate true performance design. This application note downloaded from: tri-statable output required, then additional logic would required. Aeroflex UTMC following logic devices with tristate controlled outputs: UT54ACS244, UT54ACS245, UT54ACS365, UT54ACS373, UT54ACS374, UT54ACS541. Each these devices non-inverting tri-statable output. SRAMs packaged shielded package, they withstand total dose 100K rads(Si) most orbits. logic devices purchased with total dose hardness ranging from 100K rads(Si) Mrad. This design example requires more board real estate board layout, along with additional timing analysis, mentioned above, replace obsoleted Systems SRAM parts. parts shown would approximately 1.75 square inches board space.
Creation Date: 6/21/02
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Aeroflex UTMC Application Note UTXQ512-AN-000
/EN_MEM_L A(18:0) /EN_MEM_H
512K
512K
Modification Date:
D(3:7)
Written
UT54ACS151
INPUTS SELECT C(D2) B(D1) A(D0)
OUTPUT STROBE
Read system
Truth Table
Creation Date: 6/21/02 Page
Aeroflex UTMC Application Note UTXQ512-AN-000
Creation Date: 6/21/02
Page
Modification Date:
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