MC74HC125A_14 Datasheet, PDF (4/7 Pages) ON Semiconductor – Quad 3-State Noninverting Buffers

MC74HC125A, MC74HC126A
SWITCHING WAVEFORMS
t_r
INPUT A
t_PLH
OUTPUT Y
90%
50%
10%
90%
50%
10%
t_TLH
Figure 1.
t_f
V_CC
GND
t_PHL
t_THL
OE (HC125A)
OE (HC126A)
OUTPUT Y
OUTPUT Y
50%
50%
t_PZL t_PLZ
50%
t_PZH t_PHZ
50%
Figure 2.
V_CC
GND
V_CC
GND
HIGH
IMPEDANCE
10% _VOL
90% ^VOH
HIGH
IMPEDANCE
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
C_L*
DEVICE
UNDER
TEST
TEST POINT
OUTPUT ^{1 kW}
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 3. Test Circuit
*Includes all probe and jig capacitance
Figure 4. Test Circuit
V_CC
OE
A
Y
HC125A
(1/4 OF THE DEVICE)
V_CC
OE
A
Y
HC126A
(1/4 OF THE DEVICE)
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