74HC View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
74HC Datasheet PDF : 19 Pages
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Philips Semiconductors
HCMOS family characteristics
FAMILY SPECIFICATIONS
HC TYPES
AC waveforms 74HC
handbook, halfpage
INPUT
tr
10%
tPHL
90%
50%
tf
VCC
tPLH
GND
OUTPUT
90%
50%
10%
tTHL
tTLH
MGK564
Fig.3 Input rise and fall times, transition times and propagation delays for combinatorial logic ICs.
AC waveforms 74HC
handbook, full pagewidth
CLOCK
INPUT
DATA
INPUT
OUTPUT
SET,
RESET,
PRESET
INPUT
1/fmax
tr
tf
10 %
90%
50%
tWH
tWL
th
th
50%
tsu
10%
tPLH
trem
tTLH
90%
50%
50%
tsu
tTHL
tPHL
VCC
GND
VCC
GND
VCC
GND
MGK569
(1) In Fig.4 the active transition of the clock is going from LOW-to-HIGH and the active level of the forcing signals (SET, RESET
and PRESET) is HIGH. The actual direction of the transition of the clock input and the actual active levels of the forcing signals
are specified in the individual device data sheet.
(2) For AC measurements: tr = tf = 6 ns; when measuring fmax, there is no constraint on tr, tf with 50% duty factor.
Fig.4 Set-up times, hold times, removal times, propagation delays and the maximum clock pulse frequency for
sequential logic ICs.
March 1988
10
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