These high-speed TTL circuits are designed to be used in high-performance parallel multiplication applications. When connected as shown in Figure A, these circuits perform the positive-logic multiplication of two 4-bit binary words. The eight-bit binary product is generated with typically only 40 nanoseconds delay.
●This basic four-by-four multiplier can be utilized as a fundamental building block for implementing larger multipliers. For example, the four-by-four building blocks can be connected as shown in Figure B to generate submultiple partial products. These results can then be summed in a Wallace tree, and, as illustrated, will produce a 16-bit product for the two eight-bit words typically in 70 nanoseconds. SN54H183/SN74H183 carry-save adders and SN54S181/SN74S181 arithmetic logic units with the SN54S182/SN74S182 look-ahead generator are used to achieve this high performance. The scheme is expandable for implementing N × M bit multipliers.
●The SN54284 and SN54285 are charaterized for operation over the full military temperature range of -55°C to 125°C; the SN74284 and SN74285 are characterized for operation from 0°C to 70°C.
● Fast Multiplication of Two Binary Numbers
●8-Bit Product in 40 ns Typical
● Expandable for N-Bit-by-n-Bit Applications:
●16-Bit Product in 70 ns Typical
●32-Bit Product in 103 ns Typical
● Fully Compatible with Most TTL Circuits
● Diode-Clamped Inputs Simplify System Design
