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The IALUs have hardware support for circular buffers, bit reverse, and zero-overhead looping. Circular buffers facilitate efficient programming of delay lines and other data structures required in digital signal processing, and they are commonly used in digital filters and Fourier transforms. Each IALU pro- vides registers for four circular buffers, so applications can set up a total of eight circular buffers. The IALUs handle address pointer wraparound automatically, reducing overhead, increas- ing performance, and simplifying implementation. Circular buffers can start and end at any memory location.
The Discrete Products Operation of Intersil Corporation has developed a series of Radiation Hardened MOSFETs specif- ically designed for commercial and military space applica- tions. Enhanced Power MOSFET immunity to Single Event Effects (SEE), Single Event Gate Rupture (SEGR) in particu- lar, is combined with 100K RADS of total dose hardness to provide devices which are ideally suited to harsh space envi- ronments. The dose rate and neutron tolerance necessary for military applications have not been sacrificed.
  The S9306C devices combine 10-bit CMOS shift registers, accom- panying data latches and control circuitry with bipolar sourcing outputs and pnp active pull downs. Designed primarily to drive vacuum- fluorescent displays, the 60 V and -40 mA output ratings also allow these devices to be used in many other peripheral power driver applica- tions. The S9306C feature an increased data input rate (compared with the older UCN/UCQ5810-F) and a controlled output slew rate.   The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 3.3 V or 5 V logic supply, serial-data input rates of at least 10 MHz .   A CMOS serial data output permits cascade connections in applica- tions requiring additional drive lines. Similar devices are available as the A6812C (20 bits) and A6818C (32 bits).   The S9306C output source drivers are npn Darlingtons, capable of sourcing up to 40 mA. The controlled output slew rate reduces electro- magnetic noise, which is an important consideration in systems that include telecommunications and/or microprocessors and to meet government emissions regulations. For inter-digit blanking, all output drivers can be disabled and all sink drivers turned on with a BLANK- ING input high. The pnp active pull-downs will sink at least 2.5 mA.   The S9306C are available in two temperature ranges for optimum performance in commercial (suffix S-) or industrial (suffix E-) applica- tions. They are provided in two package styles for through-hole DIP (suffix -A) or minimum-area surface-mount SOIC (suffix -LW). Copper lead frames, low logic-power dissipation, and low output- saturation voltages allow all devices to source 25 mA from all outputs continuously over the maximum operating temperature range.