
Allicdata Part #: | 1727-3416-ND |
Manufacturer Part#: |
74HCT390DB,112 |
Price: | $ 0.60 |
Product Category: | Integrated Circuits (ICs) |
Manufacturer: | Nexperia USA Inc. |
Short Description: | IC DUAL DEC RIPPLE COUNT 16-SSOP |
More Detail: | Counter IC Counter, Decade 2 Element 4 Bit Negativ... |
DataSheet: | ![]() |
Quantity: | 1210 |
1 +: | $ 0.54810 |
10 +: | $ 0.48825 |
100 +: | $ 0.38077 |
500 +: | $ 0.31456 |
1000 +: | $ 0.24834 |
Timing: | -- |
Base Part Number: | 74HCT390 |
Supplier Device Package: | 16-SSOP |
Package / Case: | 16-SSOP (0.209", 5.30mm Width) |
Mounting Type: | Surface Mount |
Operating Temperature: | -40°C ~ 125°C |
Voltage - Supply: | 4.5V ~ 5.5V |
Trigger Type: | Negative Edge |
Count Rate: | 55MHz |
Series: | 74HCT |
Reset: | Asynchronous |
Number of Bits per Element: | 4 |
Number of Elements: | 2 |
Direction: | Up |
Logic Type: | Counter, Decade |
Part Status: | Active |
Packaging: | Tube |
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74HCT390DB,112 is a type of logic counter, divider, and basically a ring counter. It is designed for high speed operation and is derived from a classic architecture. It is used in applications that require counting, dividing, and timing functions. This device also features synchronous operation and starts counting from zero when its control terminal is excited.
The 74HCT390DB,112 has 8 addressable output pins, labeled Q0-Q7. An input signal applied to the Divide By 2 terminal can divide the output frequency by two. The number of pulses in a series is determined by setting the four frequency selector inputs, FS 0-3. The frequency selector inputs are 1:0, 4:1 and 8:3 binary representations of the power of two (1, 2, 4 and 8).
The 74HCT390DB,112 also has reset inputs, MR and SR. MR is a master reset pin that resets the counter to zero, while SR is a shift reset pin that resets the counter to the output of the frequency selector. This device is also equipped with a CLK pulse input and an SDA pulse input. CLK initiates the counter step whereas SDA restarts the counter.
The 74HCT390DB,112 is used in a wide range of applications that require counting, dividing, and timing functions. This device can be used to generate accurate time delays, create alarm gates, set up sequential signals, measure pulse repetition rates, etc. This device can also be used to interface with external events to generate pulse width modulation signals, pulse-train signals, and is also used in 4-digit decimal counters and decimal dividers.
The 74HCT390DB,112 works as follows. At each rising edge of the clock input, the currently active output (Q) will shift one place to the right, and the new output will be the number determined by the FS terminal inputs. For example, if the frequency selector inputs are set to the binary values 0111, the output frequency will divide into halves when the Divide By 2 terminal is triggered. The device will then reset the count sequence once the master reset terminal is activated.
In summary, the 74HCT390DB,112 is a logic counter, divider, and ring counter that offers high speed operation. It has 8 addressable output pins and is used in a variety of applications that require counting, dividing, and timing functions. It works by shifting the currently active output to the right when a clock is triggered, and can divide the output frequency in half when triggered by the Divide By 2 terminal.
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