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參數(shù)資料
| 型號： | 933669040652 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 門電路 |
| 英文描述： | HC/UH SERIES, HEX 1-INPUT INVERT GATE, PDIP14 |
| 封裝： | SOT-27-1, DIP-14 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 160K |
| 代理商： | 933669040652 |
September 1993
8
Philips Semiconductors
Product specication
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 (
W)
fi
= input frequency (MHz)
tr
= input rise time (
s); 10% 90%
tf
= input fall time (
s); 10% 90%
ICCa
= average additional supply current (
A)
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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