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 significant bits. The devices are expandable without external gating, in both serial and parallel fashion. The upper input terminals (A0 to A3) have buffered inputs, while the lower input terminals (B0 to B3) have unbuffered inputs.
This document is a technical datasheet for the CD54HC85, CD74HC85, CD54HCT85, and CD74HCT85 integrated circuits. These devices are high-speed magnitude comparators that use silicon-gate CMOS technology to achieve operating speeds similar to LSTTL with low power consumption.
| Propagation Delay (Typical) | 13ns |
|---|---|
| Operating Temperature Range | -55°C to 125°C |
| Supply Voltage (HC Types) | 2V to 6V |
| Supply Voltage (HCT Types) | 4.5V to 5.5V |
| Number of Bits Compared | 4-bit |
The typical propagation delay from data to output at Vec = 5V and CL = 15pF is 13ns.
Yes, the devices are expandable without external gating in both serial and parallel fashion.