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74HCT14 데이터시트(PDF) 8 Page - NXP Semiconductors

부품명 74HCT14
상세설명  Hex inverting Schmitt trigger
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT14 데이터시트(HTML) 8 Page - NXP Semiconductors

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September 1993
8
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)
fi
= input frequency (MHz)
tr
= input rise time (
µs); 10% − 90%
tf
= 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
1
T
---
1
0.8 RC
-------------------
=
HCT : f
1
T
---
1
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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