1. General description

The 74HC393; 74HCT393 is a dual 4-stage binary ripple counter. Each counter features a clock

input (nCP), an overriding asynchronous master reset input (nMR) and 4 buffered parallel outputs

(nQ0 to nQ3). The counter advances on the HIGH-to-LOW transition of nCP. A HIGH on nMR

clears the counter stages and forces the outputs LOW, independent of the state of nCP. Inputs

include clamp diodes. This enables the use of current limiting resistors to interface inputs to

voltages in excess of VCC.

2. Features and benefits

• Wide supply voltage range from 2.0 V to 6.0 V

• CMOS low power dissipation

• High noise immunity

• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

• Complies with JEDEC standards:

• JESD8C (2.7 V to 3.6 V)

• JESD7A (2.0 V to 6.0 V)

• Input levels:

• For 74HC393: CMOS level

• For 74HCT393: TTL level

• ESD protection:

• HBM JESD22-A114F exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V.

• Two 4-bit binary counters with individual clocks

• Divide by any binary module up to 28 in one package

• Two master resets to clear each 4-bit counter individually

74HCT393PW属于集成电路（IC） > 计数器，除法器。安世半导体(中国)有限公司制造生产的74HCT393PW计数器，除法器计数器和除法器 IC 是数字逻辑器件，可对输入发生的逻辑转换进行计数，然后使用多个并行输出重新发送累加的计数，和/或生成单个输出信号转换，从而对应用某些整数数量输入信号转换进行响应。除了简单的事件计数，它们还可用于各种频率合成应用。