INTRODUCTION
The QCOTSTM UT8Q512 Quantified Commercial Off-the Shelf product is a high-performance CMOS static RAM organized as 524,288 words by 8 bits. Easy memory expansion is provided by an active LOW Chip Enable (E), an active LOWOutput Enable (G), and three-state drivers. This device has a power-down feature that reduces power consumption by more than 90% when deselected.
Writing to the device i s accomplished by taking Chip Enable one (E) input LOW and Write Enable (W) inputs LOW. Data on the eight I/O pins (DQ0 through DQ7) is then written into the location specified on the address pins (A0 through A 18). Reading from the device is accomplished by taking Chip Enable one (E) and Output Enable (G) LOW while forcing Write Enable (W) HIGH. Under these conditions, the contents of the memory location specified by the address pins will appear on the I/O pins. The eight input/output pins (DQ0 through DQ7) are placed in a high impedance state when the device is deselected (E, HIGH), the outputs are disabled (GHIGH), or during a write operation (E LOWand W LOW).

FEATURES
❐ 20ns (3.3 volt supply) maximum address access time
❐ Asynchronous operation for compatibility with industry standard 512K x 8 SRAMs
❐ TTL compatible inputs and output levels, three-state bidirectional data bus
❐ Typical radiation performance
   - Total dose: 50krads
   - >100krads(Si), for any orbit, using Aeroflex UTMC patented shielded package
   - SEL Immune >80 MeV-cm2/mg
   - LETTH(0.25) = >10 MeV-cm2/mg
   - Saturated Cross Section cm2 per bit, 5.0E-9
   - <1E-8 errors/bit-day, Adams 90% geosynchronous heavy ion
❐ Packaging options:
   - 36-lead ceramic flatpack (3.42 grams)
   - 36-lead flatpack shielded (10.77 grams)
❐ Standard Microcircuit Drawing5962-99607
   - QML T and Q compliant