Add a decoupling capacitor from
VCC to GND. The capacitor needs to be placed physically close to
the device and electrically close to both the VCC and GND pins. An
example layout is shown in the LAyout.
Ensure the capacitive load at the
output is ≤ 70pF. This is not a hard limit, however it establishes peak
performance. This can be accomplished by providing short, appropriately sized
traces from the SN74HCS27 to the
receiving device.
Ensure the resistive load at the
output is larger than (VCC / 25mA) Ω. This verifies that the maximum
output current from the Absolute Maximum Ratings is not violated. Most CMOS inputs have a resistive load measured in
megaohms; much larger than the minimum calculated above.
Thermal issues are rarely a
concern for logic gates, however the power consumption and thermal increase can
be calculated using the steps provided in the application note, CMOS
Power Consumption and Cpd Calculation