74HCT123 データシートの表示（PDF） - Philips Electronics
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74HCT123 Datasheet PDF : 17 Pages
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Philips Semiconductors
Dual retriggerable monostable
multivibrator with reset
Product specification
74HC/HCT123
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HC
+25
−40 to +85
−40 to +125
UNIT
VCC
(V)
min. typ. max. min. max. min. max.
WAVEFORMS/
NOTES
tPLH
propagation delay
nRD, nA, nB to nQ
83 255
30 51
24 43
320
64
54
385
77 ns
65
tPLH
propagation delay
nRD, nA, nB to nQ
83 255
30 51
24 43
320
64
54
385
77 ns
65
tPHL
propagation delay
nRD to nQ (reset)
66 215
24 43
19 37
270
54
46
325
65 ns
55
tPLH
propagation delay
nRD to nQ (reset)
66 215
24 43
19 37
270
54
46
325
65 ns
55
tTHL / tTLH
output transition
time
19 75
95
7 15
19
6 13
16
110
22 ns
19
tW
trigger pulse width
nA = LOW
100 8
20 3
17 2
125
150
25
30
ns
21
26
tW
trigger pulse width
nB = HIGH
100 17
20 6
17 5
125
150
25
30
21
26
ns
tW
reset pulse width
nRD = LOW
100 14
20 5
17 4
125
150
25
30
21
26
ns
output pulse width
tW
nQ = HIGH
450
−
−
µs
nQ = LOW
output pulse width
tW
nQ = HIGH
75
−
−
ns
nQ = LOW
trt
retrigger time
nA, nB
110
−
−
ns
REXT
external timing
resistor
10
2
1000
1000
−
−
kΩ
CEXT
external timing
capacitor
no limits
pF
2.0
4.5
6.0
CEXT = 0 pF;
REXT = 5 kΩ
2.0
4.5
6.0
CEXT = 0 pF;
REXT = 5 kΩ
2.0
4.5
6.0
CEXT = 0 pF;
REXT = 5 kΩ
2.0
4.5
6.0
CEXT = 0 pF;
REXT = 5 kΩ
2.0
4.5
6.0
2.0
4.5 Fig.7
6.0
2.0
4.5 Fig.7
6.0
2.0
4.5 Fig.8
6.0
CEXT = 100 nF;
5.0 REXT = 10 kΩ;
Figs 7 and 8
CEXT = 0 pF;
5.0 REXT = 5 kΩ;
note 1; Figs 7 and 8
CEXT = 0 pF;
5.0 REXT = 5 kΩ;
note 2; Fig.7
2.0
5.0
Fig.9
5.0 Fig.9; note 3
1998 Jul 08
6
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