SN74LVC244APWRG4.B datasheet(12/43 Pages) TI2

12 / 43 page

7.3.2 Standard CMOS Inputs

This device includes standard CMOS inputs. Standard CMOS inputs are high impedance and are typically

modeled as a resistor in parallel with the input capacitance given in the Electrical Characteristics. The worst

case resistance is calculated with the maximum input voltage, given in the Absolute Maximum Ratings, and the

maximum input leakage current, given in the Electrical Characteristics, using Ohm's law (R = V ÷ I).

Standard CMOS inputs require that input signals transition between valid logic states quickly, as defined

by the input transition time or rate in the Recommended Operating Conditions table. Failing to meet this

specification will result in excessive power consumption and could cause oscillations. More details can be found

in Implications of Slow or Floating CMOS Inputs.

Do not leave standard CMOS inputs floating at any time during operation. Unused inputs must be terminated at

VCC or GND. If a system will not be actively driving an input at all times, then a pull-up or pull-down resistor can

be added to provide a valid input voltage during these times. The resistor value will depend on multiple factors; a

10kΩ resistor, however, is recommended and will typically meet all requirements.

7.3.3 Clamp Diode Structure

Figure 7-2 shows the inputs and outputs to this device have negative clamping diodes only.

CAUTION

Voltages beyond the values specified in the Absolute Maximum Ratings table can cause damage

to the device. The input and output voltage ratings may be exceeded if the input and output clamp-

current ratings are observed.

Figure 7-2. Electrical Placement of Clamping Diodes for Each Input and Output

7.4 Device Functional Modes

Table 7-1 lists the functional modes of the SN74LVC244A.

Table 7-1. Function Table

INPUTS(1)

OUTPUTS

(1)

H = High Voltage Level, L = Low Voltage Level, X = Do Not

Care, Z = High-Impedance State

SN74LVC244A

SCAS414AE – NOVEMBER 1992 – REVISED AUGUST 2025

www.ti.com

Submit Document Feedback

Product Folder Links: SN74LVC244A

SN74LVC244APWRG4.B Datasheet(PDF) 12 Page - Texas Instruments