UT7Q512
UT7Q512 is 512K x 8 SRAM manufactured by Aeroflex Circuit Technology.
FEATURES q 100ns (5 volt supply) maximum address access time q Asynchronous operation for patibility with industrystandard 512K x 8 SRAMs q TTL patible inputs and output levels, three-state bidirectional data bus .. q Typical radiation performance
- Total dose: 30krad(Si)
- 30krad(Si) to 300krad(Si), depending on orbit, using Aeroflex UTMC patented shielded package
- SEL Immune >80 Me V-cm2 /mg
- LET TH(0.25) = 5Me V-cm 2/mg
- Saturated Cross Section (cm2) per bit, ~1.0E-7
- 1.5E-8 errors/bit-day, Adams 90% geosynchronous heavy ion q Packaging options:
- 32-lead ceramic flatpack (weight 2.5-2.6 grams) q Standard Microcircuit Drawing 5962-99606
- QML T and Q pliant INTRODUCTION The QCOTSTM UT7Q512 Quantified mercial 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 LOW Output 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 is acplished by taking the Chip Enable One ( E) input LOW and the Write Enable ( W) input LOW. Data on the eight I/O pins (DQ0 through DQ7) is then written into the location specified on the address pins (A0 through A18). Reading from the device is acplished 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 eight I/O pins. The eight input/output pins (DQ0 through DQ 7) are placed in a high impedance state when the device is deselected (E, HIGH), the outputs are disabled (G HIGH), or during a write operation (E LOW and W LOW).
Clk. Gen.
A 0 A1 A2 A3 A4 A5 A6 A 7 A8 A 9
Pre-Charge Circuit
Row Select
Memory Array 1024 Rows 512x8 Columns
I/O Circuit Column Select Data Control CLK Gen.
A 10 A11 A 12 A 13 A 14 A 15 A 16 A 17 A 18
D Q 0
- DQ 7
E W G Figure 1. UT7Q512...
