The 74HT4020 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. This device features reduced input threshold levels to allow interfacing to TTL logic levels. Inputs also include clamp diodes, this enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
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The 74HT4020 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. This device features reduced input threshold levels to allow interfacing to TTL logic levels. Inputs also include clamp diodes, this enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
Features:-
? Wide supply voltage range from 2.0 V to 6.0 V
? Input levels: For 74HC4020: CMOS level
? Multiple package options
? Complies with JEDEC standard no. 7A
? Specified from -40? C to +85 ? C and from -40 ? C to +125 ? C
Application:-
? Frequency dividing circuits
? Time delay circuits
? Control counters
Specification:-
| Symbol | Parameter | Value | Unit |
| VCC | Supply Voltage | ? 0.5 to + 7.0V | V |
| IOK | Output Clamping Current | ? 20 | mA |
| IIK | Input Clamping Current | ? 20 | mA |
| IO | Output Current | ? 25 | mA |
| ICC | Supply Current | ? 50 | mA |
| IGND | Ground Current | ? 50 | mA |
| TSTG | Storage Temperature Range | ? 65?C to + 150 | ?C |
| Ptot | Total Power Dissipation | 500 | mW |
Related Document:-
Operating voltage | 2.5 3.0V |
Pixel Resolution | 0.3MP |
Photosensitive array | 640 x 480 |
Optical Size | 1.6 inch |
Angel of view | 67 degrees |
Maximum Frame Rate | 30fps VGA |
Sensitivity | 1.3V/(Lux-sec) |
Dormancy | Less than 20A |
Power consumption | 60mW/15fpsVGA YUV |
Temperature operation Range | -30 C ~ 70 C |
Pixel area | 3.6 x 3.6 m |
Signal to noise ratio (SNR) | 46 dB |
Dynamic range | 52 dB |
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