TIBPLS506AC

The TIBPLS506AC is a TTL field-programmable state machine of the Mealy type. This state machine (logic sequencer) contains 97 product terms (AND terms) and 48 sum terms (OR terms). The TIBPLS506AC and sum terms are used to control the 16-bit internal state registers and the 8-bit output registers.

The outputs of the internal state registers TIBPLS506AC(P0P15) are fed back and combined with the 13 inputs (I0I12) to form the AND array. In addition, two sum terms are complemented and fed back to the AND array, which allows any product term to be summed, complemented, and used as input to the AND array.

The eight output cells of TIBPLS506AC can be individually programmed for registered or combinational operation. Nonregistered operation is selected by blowing the output multiplexer fuse. Registered output operation TIBPLS506AC is selected by leaving the output multiplexer fuse intact.

Pin 17 of TIBPLS506AC can be programmed to function as an input and/or an output enable. Blowing the output enable fuse lets pin 17 function as an output enable but does not disconnect pin 17 from the input array. When the output enable fuse is intact, pin 17 functions of TIBPLS506AC only as an input with the outputs being permanently enabled.

The state and output registers TIBPLS506AC are synchronously clocked by the fuse programmable clock input. The clock polarity fuse selects either postive- or negative-edge triggering. Negative-edge triggering is selected by blowing the clock polarity fuse. Leaving this fuse intact selects positive-edge triggering. After power-up, the TIBPLS506AC must be initialized to the desired state. When the output multiplexer fuse is left intact, registered operation is selected.

The TIBPLS506AC is characterized for operation from 0°C to 75°C.