WORST

BETTER

BEST

1W min.

W

Non-inverted Output (Q)

Non-inverted Output (Q)

Positive Supply Voltage (VCC)

14

SN74LVC1G79

SCES220U – APRIL 1999 – REVISED APRIL 2017

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Typical Application (continued)

9.2.3 Application Curve

Figure 8. Data Retention With VCC Glitch Down to 1.5 V

10 Power Supply Recommendations

The power supply can be any voltage between the minimum and maximum supply voltage rating listed in

Recommended Operating Conditions. A 0.1-µF bypass capacitor is recommended to be connected from the VCC

terminal to GND to prevent power disturbance. To reject different frequencies of noise, use multiple bypass

capacitors in parallel. Capacitors with values of 0.1 µF and 1 µF are commonly used in parallel. The bypass

capacitor must be installed as close to the power terminal as possible for best results.

11 Layout

11.1 Layout Guidelines

When a PCB trace turns a corner at a 90° angle, a reflection can occur. A reflection occurs primarily because of

the change of width of the trace. At the apex of the turn, the trace width increases to 1.414 times the width. This

increase upsets the transmission-line characteristics, especially the distributed capacitance and self–inductance

of the trace which results in the reflection. Not all PCB traces can be straight and therefore some traces must

turn corners. Figure 9 shows progressively better techniques of rounding corners. Only the last example (BEST)

maintains constant trace width and minimizes reflections.

11.2 Layout Example

Figure 9. Trace Example