7 Detailed Description

7.1 Overview

This device contains six independent inverters with Schmitt-trigger inputs. Each gate performs the Boolean

function Y = A in positive logic.

7.2 Functional Block Diagram

One of Six Channels

xA

xY

7.3 Feature Description

7.3.1 Balanced CMOS Push-Pull Outputs

This device includes balanced CMOS push-pull outputs. The term balanced indicates that the device can sink

and source similar currents. The drive capability of this device may create fast edges into light loads, so routing

and load conditions should be considered to prevent ringing. Additionally, the outputs of this device are capable

of driving larger currents than the device can sustain without being damaged. It is important to limit the output

power of the device to avoid damage due to overcurrent. The electrical and thermal limits defined in the Absolute

Maximum Ratings must be followed at all times.

Unused push-pull CMOS outputs must be left disconnected.

7.3.2 TTL-Compatible Schmitt-Trigger CMOS Inputs

This device includes TTL-compatible CMOS inputs with Schmitt-trigger architecture. These inputs are

specifically designed to interface with TTL logic devices by having reduced input voltage thresholds.

TTL-compatible Schmitt-trigger 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).

The Schmitt-trigger input architecture provides hysteresis as defined by ΔVT in the Electrical Characteristics

table, which makes this device extremely tolerant to slow or noisy inputs. While the inputs can be driven much

slower than standard CMOS inputs, it is still recommended to properly terminate unused inputs. Driving the

inputs with slow transitioning signals will increase dynamic current consumption of the device. For additional

information regarding Schmitt-trigger inputs, please see Understanding Schmitt Triggers.

Do not leave TTL-compatible 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, 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, however a 10kΩ resistor is recommended and will typically meet all requirements.

7.3.3 Wettable Flanks

This device includes wettable flanks for at least one package. See the Features section on the front page of the

data sheet where packages include this feature.

SN74ACT14-Q1

SCASE26 – NOVEMBER 2024

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