74HC14 datasheet(8/8 Pages) PHILIPS

8 / 8 page

September 1993

Philips Semiconductors

Product speciﬁcation

Hex inverting Schmitt trigger

74HC/HCT14

APPLICATION INFORMATION

The slow input rise and fall times cause additional power

dissipation, this can be calculated using the following

formula:

Pad = fi × (tr × ICCa +tf × ICCa) × VCC.

Where:

Average ICCa differs with positive or negative input

transitions, as shown in Figs 14 and 15.

Pad

= additional power dissipation (

µW)

= input frequency (MHz)

= input rise time (

µs); 10% − 90%

= input fall time (

µs); 10% − 90%

ICCa

= average additional supply current (

µA)

Fig.14 Average ICC for HC Schmitt trigger devices;

linear change of Vi between 0.1 VCC to

0.9 VCC

Fig.15 Average ICC for HCT Schmitt trigger devices;

linear change of Vi between 0.1 VCC to

0.9 VCC.

HC/HCT14 used in a relaxation oscillator circuit, see

Fig.16.

Fig.16 Relaxation oscillator using HC/HCT14.

HC : f

---

0.8 RC

-------------------

≈

HCT : f

---

0.67 RC

----------------------

≈

Note to Application information

All values given are typical unless otherwise specified.

PACKAGE OUTLINES

See

“74HC/HCT/HCU/HCMOS Logic Package Outlines”.

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