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CD54HC123 Datasheet, PDF (5/16 Pages) Texas Instruments – High-Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Resets
◁
CD54/74HC123, CD54/74HCT123, CD74HC423, CD74HCT423
Prerequisite for Switching Specifications (Continued)
25oC
PARAMETER
R
SYMBOL VCC (V) MIN
tWL
2
100
4.5
20
TYP
-
-
MAX
-
-
6
17
-
-
A and B Hold Time
tH
2
50
-
-
4.5
10
-
-
6
9
-
-
Reset Removal Time
tREM
2
50
-
-
4.5
10
-
-
6
9
-
-
Retrigger Time Number
trT
RX = 10KΩ, CX = 0
5
-
-
-
-
50
-
-40oC TO 85oC
MIN TYP MAX
125
-
-
25
-
-
21
-
-
65
-
-
13
-
-
11
-
-
65
-
-
13
-
-
11
-
-
-
-
-
-
63
-
-55oC TO 125oC
MIN TYP MAX UNITS
150
-
150 ns
30
-
30
ns
26
-
26
ns
75
-
75
ns
15
-
15
ns
13
-
13
ns
75
-
75
ns
15
-
15
ns
13
-
13
ns
-
-
-
ns
-
76
-
ns
Output Pulse Width
Q or Q
tW
5
RX = 10KΩ, CX = 10nF
HCT TYPES
Minimum Input,
Pulse Width
tWL
A
40
-
50 38.7
-
51.3 38.2
-
51.8 µs
5
20
-
-
25
-
-
-
30
-
-
ns
B
tWH
20
-
-
25
-
-
30
-
-
ns
R
tWL
20
-
-
25
-
-
30
-
-
ns
A and B Hold Time
tH
5
10
-
-
13
-
-
15
-
-
ns
Reset Removal Time
tREM
5
10
-
-
13
-
-
15
-
ns
Retrigger Time Number
(Note 3)
RX = 10KΩ, CX = 0
trT
5
-
50
-
-
63
-
-
76
-
ns
Output Pulse Width Q or Q
tW
5
40
-
50 38.7
-
51.3 38.2
-
51.8 µs
RX = 10KΩ, CX = 10nF
NOTE:
3. Time to trigger depends on the values of RX and CX. The output pulse width can only be extended when the time between the active-
going edges of the trigger input pulses meet the minimum retrigger time requirement.
5
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