CD74HC4520 - 高速 CMOS 逻辑双路二进制加计数器

CD74HC4520是TI德州仪器公司的一款计数器/算术/奇偶校验功能产品，CD74HC4520是高速 CMOS 逻辑双路二进制加计数器，本站介绍了CD74HC4520的封装应用图解、特点和优点、功能等，并给出了与CD74HC4520相关的TI元器件型号供参考。

CD74HC4520 - 高速 CMOS 逻辑双路二进制加计数器 - 计数器/算术/奇偶校验功能 - 特殊逻辑 - 德州仪器

产品描述

The CD74HC4518 is a dual BCD up-counter. The ’HC4520 and CD74HCT4520 are dual binary up-counters. Each device consists of two independent internally synchronous 4-stage counters. The counter stages are D-type flip-flops having interchangeable CLOCK and ENABLE lines for incrementing on either the positive-going or the negative-going transition of CLOCK. The counters are cleared by high levels on the MASTER RESET lines. The counter can be cascaded in the ripple mode by connecting Q3 to the ENABLE input of the subsequent counter while the CLOCK input of the latter is held low.

产品特性

Positive or Negative Edge Triggering
Synchronous Internal Carry Propagation
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

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