74HC132 datasheet(8/8 Pages) PHILIPS

8 / 8 page

September 1993

Philips Semiconductors

Product speciﬁcation

Quad 2-input NAND Schmitt trigger

74HC/HCT132

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

ICCa

= additional power dissipation (

µW)

= input frequency (MHz)

= input rise time (ns); 10%

− 90%

= input fall time (ns); 10%

− 90%

= 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/HCT132 used in a relaxation oscillator circuit, see Fig.16.

Note to Application information

All values given are typical unless otherwise specified.

PACKAGE OUTLINES

See

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

Fig.16 Relaxation oscillator using HC/HCT132.

HC:

HCT:

---

0.8RC

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

≈

---

0.67 RC

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

≈

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