74HC245
DIRECTION
t
r
INPUT
A OR B
t
PLH
OUTPUT
B OR A
90%
50%
10%
90%
50%
10%
t
TLH
t
PHL
t
f
V
CC
GND
50%
V
CC
GND
V
CC
OUTPUT
ENABLE
50%
t
PZL
50%
t
PZH
t
PHZ
t
PLZ
10%
90%
GND
HIGH
IMPEDANCE
V
OL
V
OH
HIGH
IMPEDANCE
A OR B
t
THL
A OR B
50%
Figure 3. Switching Waveform
Figure 4. Switching Waveform
TEST POINT
OUTPUT
DEVICE
UNDER
TEST
C
L
*
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
1 kW
CONNECT TO V
CC
WHEN
TESTING t
PLZ
AND t
PZL
.
CONNECT TO GND WHEN
TESTING t
PHZ
AND t
PZH
.
C
L
*
*Includes all probe and jig capacitance
*Includes all probe and jig capacitance
Figure 5. Test Circuit
Figure 6. Test Circuit
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