MM54HC181中文资料Arithmetic Logic Units/Function Generators数据手册TI规格书

描述 Description

General Description
These arithmetic logic units (ALU)/function generators utilize advanced silicon-gate CMOS technology. They possess the high noise immunity and low power consumption of standard CMOS integrated circuits, as well as the ability to drive 10 LS-TTL loads.
The MM54HC181/MM74HC181 are arithmetic logic unit (ALU)/function generators that have a complexity of 75 equivalent gates on a monolithic chip. These circuits perform 16 binary arithmetic operations on two 4-bit words as shown in Tables 1 and 2. These operations are selected by the four function-select lines (S0, S1, S2, S3) and include addition, subtraction, decrement, and straight transfer. When performing arithmetic manipulations, the internal carries must be enabled by applying a low-level voltage to the mode control input (M). A full carry look-ahead scheme is made available in these devices for fast, simultaneous carry generation by means of two cascade-outputs (pins 15 and 17) for the four bits in the package. When used in conjunction with the MM54HC182 or MM74HC182, full carry look ahead circuits, high-speed arithmetic operations can be performed. The method of cascading HC182 circuits with these ALU’s to provide multi-level full carry look-ahead is illustrated under typical applications data for the MM54HC182/MM74HC182

特性 Features

■ Full look-ahead for high-speed operations on long words
■ Arithmetic operating modes:
   Addition
   Subtraction
   Shift operand a one position magnitude comparison
   Plus twelve other arithmetic operations
■ Logic function modes:
   Exclusive-OR
   Comparator
   AND, NAND, OR, NOR
   Plus ten other logic operations
■ Wide operating voltage range: 2V–6V
■ Low input current: 1 μA maximum
■ Low quiescent current: 80 μA maximum