CD74HCT85 - 高速 CMOS 逻辑 4 位幅度比较器

CD74HCT85是TI德州仪器公司的一款数字比较器产品，CD74HCT85是高速 CMOS 逻辑 4 位幅度比较器，本站介绍了CD74HCT85的封装应用图解、特点和优点、功能等，并给出了与CD74HCT85相关的TI元器件型号供参考。

CD74HCT85 - 高速 CMOS 逻辑 4 位幅度比较器 - 数字比较器 - 特殊逻辑 - 德州仪器

产品描述

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 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.

产品特性

Buffered Inputs and Outputs
Typical Propagation Delay: 13ns (Data to Output at VCC = 5V, CL = 15pF, TA = 25°C
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 . . . –55°C to 125°C
Balanced Propagation Delay and Transition Times
Significant Power Reduction Compared to LSTTL Logic ICs
HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30%of VCC at VCC = 5V
HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il 1µA at VOL, VOH

Data sheet acquired from Harris Semiconductor

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