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MC74HC574A_14 Datasheet, PDF (5/9 Pages) ON Semiconductor – Octal 3-State Noninverting D Flip-Flop
◁
tr
tf
CLOCK
90%
50%
10%
tw
90%
Q 50%
10%
1/fmax
tPLH
tPHL
tTLH
tTHL
Figure 2.
MC74HC574A
SWITCHING WAVEFORMS
VCC
GND
OUTPUT
ENABLE
Q
Q
VM
tPZL tPLZ
VM
tPZH
tPHZ
VCC
GND
HIGH
IMPEDANCE
10% VOL
90% VOH
MC74HC574A: VM = VOH x 0.5
MC74HCT574A: VM = 1.3 V @ VCC = 3 V
Figure 3.
DATA
CLOCK
VALID
50%
tsu
th
50%
Figure 4.
VCC
GND
VCC
GND
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
CL*
*Includes all probe and jig capacitance.
Figure 5.
D0 2
D1 3
D2 4
DEVICE
UNDER
TEST
TEST POINT
OUTPUT 1 kW
CL*
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
*Includes all probe and jig capacitance.
Figure 6. Test Circuit
D3 5
D4 6
D5 7
D6 8
D7 9
CLOCK 11
OUTPUT ENABLE 1
C
Q
D
C
Q
D
C
Q
D
C
Q
D
C
Q
D
CQ
D
C
Q
D
C
Q
D
19 Q0
18 Q1
17 Q2
16 Q3
15 Q4
14 Q5
13 Q6
12 Q7
Figure 7. Expanded Logic Diagram
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