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參數(shù)資料
| 型號： | 935171440112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 門電路 |
| 英文描述： | HC/UH SERIES, QUAD 2-INPUT NAND GATE, PDSO14 |
| 封裝： | SOT-337-1, SSOP-14 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 158K |
| 代理商： | 935171440112 |
September 1993
8
Philips Semiconductors
Product specication
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
fi
tr
tf
ICCa
= additional power dissipation (
W)
= input frequency (MHz)
= input rise time (ns); 10%
90%
= input fall time (ns); 10%
90%
= 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/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:
f
1
T
---
1
0.8RC
-----------------
≈
=
f
1
T
---
1
0.67 RC
----------------------
≈
=
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