SN54LS681

The SN54LS681 is a type of 4-bit parallel binary accumulator. Full carry look-ahead is offered for fast carry of four-bit words. The A and B registers are controlled by three inputs(RSO, RS1, RS2). These pins define eight distinct register modes.

Features of SN54LS681 are: (1)full 4-bit binary accumlator in a single 20-pin package; (2)contains two synchronous registers: word A, word B shift/accumulator; (3)16 arithmetic operation including B minus A and A minus B; (4)16 logi c-mode operations; (5)expandable to handle N-bit words with full carry look-ahead; (6)bus driving I/O ports.

The absolute maximum ratings and electrical characteristics of the SN54LS681 can be summarized as: (1)supply volt age: 7V; (2)input voltage: 7V;(3)operating free air temperature range:-55 to 125;(4)storage temperature rang:-65 to 150. Electrical characteristics: (1)high-level input voltage: 2V min; (2)low-level input voltage: 0.7V max; (3)input clamp voltage(VCC=min, I1=-18mA): -1.5V max; (4)high level input current(VCC=max, V1=2.7V): 100uA max; (5)low level input current(VCC=max, V1=0.4V):-4mA max; (6)short-circuit output current(VCC=max):-30mA min and-130mA max; (7)supply current(VCC=max, RS0 at 4.5V, all other I/O at 0V): 100mA typ and 150mA max, etc.