74HC Datasheet, 74HC stage Binary Counter Datasheet, buy 74HC The MC54/74HC is identical in pinout to the standard CMOS. MCB. The device inputs are compatible with standard CMOS outputs; with pullup. INTEGRATED CIRCUITS. 74HC/HCT stage binary ripple counter with oscillator. For a complete data sheet, please also download.
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The function of R2 is to minimize the in?
The product status of device s described in this document may have changed since this document was published and may differ in case of multiple devices. In consideration of accuracy, Ct must be larger than the inherent stray capacitance. Feb 23, 1.
74HC Datasheet catalog
Data sheet status Document status Objective [short] data sheet Preliminary [short] data sheet Product [short] data sheet    Product status Development Quali? It uses the same pins 10 and 11 as the RC oscillator. They float up to the logic level changeover point and oscillate.
Please consult the most recently issued document before initiating or completing a design. For starting and maintaining oscillation a minimum transconductance is necessary, so R2 should not be too large.
NXP Semiconductors makes no representation or warranty that such applications will be suitable for the speci?
However, I tried this configuration that is annexed in the image below and I cannot get any oscillation at all. Feb 24, 6. The output will probably be close to 1 MHz. The stray capacitance C2 should be kept as small as possible. For more information, please visit: RC oscillator frequency as a function of Rt Fig What else could be wrong? I plugged the oscilloscope in the 7-pin and I did not saw any oscillation at all A practical value for R2 is 2.
Could anyone help me please? Revision history Table There are many datasheets for the osc Example of a RC oscillator The recommended values for these components to maintain agreement with the typical oscillation formula are: Exposure to limiting values for extended periods may affect device reliability. The format of this data sheet has been redesigned to comply with the new identity guidelines of NXP Semiconductors.
All referenced brands, product names, service names and trademarks are the property of their respective owners. The 74HC can use a 1MHz crystal for accuracy.
Contact information For more information, please visit: The resistor at pin 11 should be about 10 times the value of the timing resistor but yours is way too high. The circuit for the crystal oscillator is in the datasheet. You would need a frequency counter to see what the actual output frequency was, and change components to get it to the correct frequency.
Dynamic characteristics Table 6. Feb 24, 5. Ratasheet derates linearly with 5.
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