SN74HCS164 データシート(PDF) 13 Page - Texas Instruments
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SN74HCS164 Datasheet(HTML) 13 Page - Texas Instruments
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The SN74HCS164 can drive a load with a total capacitance less than or equal to 50 pF while still meeting all of
the datasheet specifications. Larger capacitive loads can be applied, however it is not recommended to exceed
The SN74HCS164 can drive a load with total resistance described by R
, with the output voltage and
current defined in the Electrical Characteristics table with V
. When outputting in the high state, the
output voltage in the equation is defined as the difference between the measured output voltage and the supply
voltage at the V
Total power consumption can be calculated using the information provided in CMOS Power Consumption and
Thermal increase can be calculated using the information provided in Thermal Characteristics of Standard Linear
and Logic (SLL) Packages and Devices.
The maximum junction temperature, T
listed in the Absolute Maximum Ratings, is an additional
limitation to prevent damage to the device. Do not violate any values listed in the Absolute Maximum
Ratings. These limits are provided to prevent damage to the device.
184.108.40.206 Input Considerations
Input signals must cross V
to be considered a logic LOW, and V
to be considered a logic HIGH. Do
not exceed the maximum input voltage range found in the Absolute Maximum Ratings.
Unused inputs must be terminated to either V
or ground. These can be directly terminated if the input is
completely unused, or they can be connected with a pull-up or pull-down resistor if the input is to be used
sometimes, but not always. A pull-up resistor is used for a default state of HIGH, and a pull-down resistor is used
for a default state of LOW. The resistor size is limited by drive current of the controller, leakage current into the
SN74HCS164, as specified in the Electrical Characteristics, and the desired input transition rate. A 10-kΩ
resistor value is often used due to these factors.
The SN74HCS164 has no input signal transition rate requirements because it has Schmitt-trigger inputs.
Another benefit to having Schmitt-trigger inputs is the ability to reject noise. Noise with a large enough amplitude
can still cause issues. To know how much noise is too much, please refer to the ΔV
in the Electrical
Characteristics. This hysteresis value will provide the peak-to-peak limit.
Unlike what happens with standard CMOS inputs, Schmitt-trigger inputs can be held at any valid value without
causing huge increases in power consumption. The typical additional current caused by holding an input at a
value other than V
or ground is plotted in the Typical Characteristics.
Refer to the Feature Description section for additional information regarding the inputs for this device.
220.127.116.11 Output Considerations
The positive supply voltage is used to produce the output HIGH voltage. Drawing current from the output will
decrease the output voltage as specified by the V
specification in the Electrical Characteristics. The ground
voltage is used to produce the output LOW voltage. Sinking current into the output will increase the output
voltage as specified by the V
specification in the Electrical Characteristics.
Push-pull outputs that could be in opposite states, even for a very short time period, should never be connected
directly together. This can cause excessive current and damage to the device.
Two channels within the same device with the same input signals can be connected in parallel for additional
output drive strength.
Unused outputs can be left floating. Do not connect outputs directly to V
Refer to Feature Description section for additional information regarding the outputs for this device.
SCLS827 – AUGUST 2020
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