74HC Philips, 74HC Datasheet - Page 14

• Manufacturer Part Number: 74HC
• Description: HCMOS family characteristics
• Manufacturer: Philips

Philips Semiconductors
AC waveforms 74HCT (continued)
Test circuit for 74HCT
March 1988
handbook, full pagewidth
handbook, full pagewidth
HCMOS family characteristics
Switch position
Note
1. For open-drain N-channel outputs t
TEST
t
t
t
t
C
R
PZH
PZL
PHZ
PLZ
L
T
=
=
load capacitance including jig and probe capacitance
(see AC CHARACTERISTICS for values).
termination resistance should be equal to the output impedance Z
the pulse generator.
SWITCH
GND
V
GND
V
CC
CC
LOW-to-OFF
OFF-to-LOW
HIGH-to-OFF
OFF-to-HIGH
MGK566
OUTPUT
OUTPUT
OUTPUT
ENABLE
GENERATOR
PULSE
Fig.11 Propagation delays of 3-state outputs.
90%
Fig.12 Test circuit for 3-state outputs.
PLZ
t f
1.3 V
10%
and t
V I
t PLZ
enabled
outputs
t PHZ
PZL
R T
are applicable.
10%
D.U.T
V CC
90%
14
o
of
disabled
outputs
V O
C L
t r
t PZL
t PZH
R L = 1 k
50 pF
FAMILY SPECIFICATIONS
1.3 V
MGK563
1.3 V
outputs
enabled
V CC