MC74HC540A_14 Datasheet, PDF (4/7 Pages) ON Semiconductor – Octal 3-State Inverting Buffer/Line Driver/Line Receiver

MC74HC540A
t_r
INPUT A
t_PHL
OUTPUT Y
90%
50%
10%
90%
50%
10%
t_THL
t_f
V_CC
GND
t_PLH
t_TLH
Figure 2. Switching Waveform
OE1 or OE2
t_PZL
OUTPUT Y
t_PZH
OUTPUT Y
50%
t_PLZ
50%
t_PHZ
50%
50%
10%
90%
V_CC
GND
HIGH
IMPEDANCE
V_OL
V_OH
HIGH
IMPEDANCE
Figure 3. Switching Waveform
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
C_L*
*Includes all probe and jig capacitance
Figure 4. Test Circuit
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
1kW
C_L*
CONNECT TO V_CC WHEN
TESTING t_PLZ AND t_PZL.
CONNECT TO GND WHEN
TESTING t_PHZ and t_PZH.
*Includes all probe and jig capacitance
Figure 5. Test Circuit
INPUT A
To 7 Other Inverters
One of Eight
Inverters
V_CC
OUTPUT Y
OE1
OE2
Figure 6. Logic Detail
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