SN74LVC1G34DBVT datasheet(13/54 Pages) TI2

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8.2.1 Design Requirements

8.2.1.1 Power Considerations

Ensure that the desired supply voltage is within the range specified in the Electrical Characteristics. The supply

voltage sets the device electrical characteristics of the device, as described in the Electrical Characteristics

section.

The positive voltage supply must be capable of sourcing current equal to the maximum static supply current, ICC,

listed in the Electrical Characteristics, and any transient current required for switching.

The ground must be capable of sinking current equal to the total current to be sunk by all outputs of the

SN74LVC1G34 plus the maximum supply current, ICC, listed in the Electrical Characteristics, and any transient

current required for switching. The logic device can only sink as much current that can be sunk into its ground

connection. Ensure the maximum total current through GND listed in the Absolute Maximum Ratings is not

exceeded.

The SN74LVC1G34 can drive a load with a total capacitance less than or equal to 50pF while still meeting all of

the data sheet specifications. Larger capacitive loads can be applied; however, it is not recommended to exceed

50pF.

The SN74LVC1G34 can drive a load with total resistance described by RL ≥ VO / IO, with the output voltage and

current defined in the Electrical Characteristics table with VOL. 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 VCC pin.

Total power consumption can be calculated using the information provided in the CMOS Power Consumption

and Cpd Calculation application note.

Thermal increase can be calculated using the information provided in the Thermal Characteristics of Standard

Linear and Logic (SLL) Packages and Devices application note.

CAUTION

The maximum junction temperature, TJ(max) 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.

8.2.1.2 Input Considerations

Input signals must cross to be considered a logic LOW, and 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 VCC or ground. The unused inputs 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 will 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 drive current of the controller, leakage current into the SN74LVC1G34 (as

specified in the Electrical Characteristics), and the desired input transition rate limits the resistor size. A 10kΩ

resistor value is often used due to these factors.

Refer to the Feature Description for additional information regarding the inputs for this device.

8.2.1.3 Output Considerations

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 VOL specification in the Electrical Characteristics.

Unused outputs can be left floating. Do not connect outputs directly to VCC or ground.

Refer to the Feature Description section for additional information regarding the outputs for this device.

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SN74LVC1G34

SCES519O – DECEMBER 2003 – REVISED OCTOBER 2025

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