74HCT4020集成電路（IC）的計數(shù)器除法器規(guī)格書PDF中文資料

1. General description

The 74HC4020; 74HCT4020 is a 14-stage binary ripple counter with a clock input (CP), an

overriding asynchronous master reset input (MR) and 12 buffered parallel outputs (Q0, and Q3

to Q13). The counter advances on the HIGH-to-LOW transition of CP. A HIGH on MR clears all

counter stages and forces all outputs LOW, independent of the state of CP. Each counter stage is a

static toggle flip-flop. 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 74HC4020: CMOS level

? For 74HCT4020: TTL level

? ESD protection:

? HBM JESD22-A114F exceeds 2000 V

? MM JESD22-A115-A exceeds 200 V

? Multiple package options

? Specified from -40 °C to +85 °C and from -40 °C to +125 °C

3. Applications

? Frequency dividing circuits

? Time delay circuits

? Control counters