器件名称:
CD54HCT85
功能描述:
High-Speed CMOS Logic 4-Bit Magnitude Comparator
文件大小:
638.79KB 共18页
简 介:
CD54HC85, CD74HC85, CD54HCT85, CD74HCT85 Data sheet acquired from Harris Semiconductor SCHS136E August 1997 - Revised October 2003 High-Speed CMOS Logic 4-Bit Magnitude Comparator Description The ’HC85 and ’HCT85 are high speed magnitude comparators that use silicon-gate CMOS technology to achieve operating speeds similar to LSTTL with the low power consumption of standard CMOS integrated circuits. These 4-bit devices compare two binary, BCD, or other monotonic codes and present the three possible magnitude results at the outputs (A > B, A < B, and A = B). The 4-bit input words are weighted (A0 to A3 and B0 to B3), where A3 and B3 are the most signicant bits. The devices are expandable without external gating, in both serial and parallel fashion. The upper part of the truth table indicates operation using a single device or devices in a serially expanded application. The parallel expansion scheme is described by the last three entries in the truth table. Features Buffered Inputs and Outputs [ /Title (CD74 HC85, CD74 HCT85 ) /Subject (High Speed CMOS Logic 4-Bit Magnitude Compara- Typical Propagation Delay: 13ns (Data to Output at VCC = 5V, CL = 15pF, TA = 25oC Serial or Parallel Expansion Without External Gating Fanout (Over Temperature Range) - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads Wide Operating Temperature Range . . . -55oC to 125oC Balanced Propagation Delay and Transition Tim……
