參數(shù)資料
型號(hào)： 935183540112
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 門(mén)電路
英文描述： HCT SERIES, HEX 1-INPUT INVERT GATE, PDSO14
封裝： SOT-402-1, TSSOP-14
文件頁(yè)數(shù)： 11/12頁(yè)
文件大小： 160K
代理商： 935183540112
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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