HD74HC123A
AC Characteristics
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Ta = 25°C
Item
Symbol
Ta = –40 to
+85°C
Max
265
53
45
300
60
51
215
43
37
225
45
38
95
19
16
95
19
16
—
—
—
—
—
—
—
10
ms
pF
Cext = 0.1
µF,
Rext = 10 kΩ
µs
ns
Cext = 28 pF
Rext = 6 kΩ
Rext = 2 kΩ
ns
A, B, Clear
ns
ns
ns
Clear to
Q
ns
Clear to Q
ns
A, B or Clear to
Q
Unit
ns
Test Conditions
A, B or Clear to Q
V
CC
(V) Min Typ Max Min
2.0
4.5
6.0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
22
—
—
23
—
—
18
—
—
16
—
—
5
—
—
5
—
210 —
42
36
—
—
Propagation delay t
PLH
time
t
PHL
2.0
4.5
6.0
240 —
48
41
—
—
t
PHL
2.0
4.5
6.0
170 —
34
29
—
—
t
PLH
2.0
4.5
6.0
180 —
36
31
75
15
13
75
15
13
—
—
—
—
—
—
—
—
—
—
—
190
38
33
—
—
—
—
—
Output rise time
t
TLH
2.0
4.5
6.0
Output fall time
t
THL
2.0
4.5
6.0
Pulse width
t
w
2.0
4.5
6.0
150 —
30
26
—
—
—
—
—
6
—
Minimum output
pulse width
t
WQ(min)
2.0
4.5
6.0
1.5 —
450 —
380 —
1.0 —
5
10
Output pulse width t
WQ
Input capacitance
Caution in use:
Cin
4.5
—
In order to prevent any malfunctions due to noise, connect a high-frequency performance
capacitor between V
CC
and GND, and keep the wiring between the External components
and Cext, Rext/Cext pins as short as possible.
4
HITACHI [ HITACHI SEMICONDUCTOR ]
