74HC/HCT132 Philips Semiconductors (Acquired by NXP), 74HC/HCT132 Datasheet - Page 8

• Manufacturer Part Number: 74HC/HCT132
• Description: Quad 2-input NAND Schmitt Trigger
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
Application information
The slow input rise and fall times cause additional power dissipation, this can be calculated using the following formula:
P
Where:
Average I
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
September 1993
P
f
t
t
I
ad
i
r
f
CCa
ad
Quad 2-input NAND Schmitt trigger
Fig.14 Average I
HC:
HCT:
= f
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
i
f
(t
= additional power dissipation ( W)
= input frequency (MHz)
= input rise time (ns); 10%
= input fall time (ns); 10%
= average additional supply current ( A)
CCa
f
=
r
linear change of V
0.9 V
=
1
-- -
T
1
-- -
T
I
differs with positive or negative input transitions, as shown in Figs 14 and 15.
CCa
-----------------
0.8RC
CC
--------------------- -
0.67 RC
1
.
1
t
CC
f
for HC Schmitt trigger devices;
I
CCa
)
i
between 0.1 V
V
CC
Fig.16 Relaxation oscillator using HC/HCT132.
.
90%
90%
CC
to
.
8
Fig.15 Average I
devices; linear change of V
0.1 V
CC
to 0.9 V
CC
for HCT Schmitt trigger
CC
.
74HC/HCT132
Product specification
i
between