What is the ACE/Mini-ACE™’s radiation tolerance?
A. In 1995, we had radiation testing performed on a BU-61581 ACE (with 1.25 micron J’ protocol chip and 15V transceiver). Quoting from the report of this testing: at 2.8K rads, 5K rads, and 10K rads; and, for neutron fluences of 1.20•1012 and 2.80•1012, “The devices encountered no failures at this level”. There were no single event effects exhibited at proton fluences of 1.0•1010protons/cm2. Q. We are using the BU-61580 as a 1553 bus controller. We are only using bus A and not bus B. Do we need to terminate bus B on pins 34 and 35, and if so, what is the easiest way of doing it? We don’t want to use the 1.4:1 transformer if not necessary, because of the extra cost. A. As long as you’re not using bus B, there’s no need for a coupling transformer or termination resistors.
