74HC123 Datasheet, PDF (6/17 Pages) NXP Semiconductors – Dual retriggerable monostable multivibrator with reset

Philips Semiconductors
Dual retriggerable monostable
multivibrator with reset
Product specification
74HC/HCT123
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
T_amb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HC
+25
−40 to +85
−40 to +125
UNIT
V_CC
(V)
min. typ. max. min. max. min. max.
WAVEFORMS/
NOTES
t_PLH
propagation delay
nR_D, nA, nB to nQ
83 255
30 51
24 43
320
64
54
385
77 ns
65
t_PLH
propagation delay
nR_D, nA, nB to nQ
83 255
30 51
24 43
320
64
54
385
77 ns
65
t_PHL
propagation delay
nR_D to nQ (reset)
66 215
24 43
19 37
270
54
46
325
65 ns
55
t_PLH
propagation delay
nR_D to nQ (reset)
66 215
24 43
19 37
270
54
46
325
65 ns
55
t_THL / t_TLH
output transition
time
19 75
95
7 15
19
6 13
16
110
22 ns
19
t_W
trigger pulse width
nA = LOW
100 8
20 3
17 2
125
150
25
30
ns
21
26
t_W
trigger pulse width
nB = HIGH
100 17
20 6
17 5
125
150
25
30
21
26
ns
t_W
reset pulse width
nR_D = LOW
100 14
20 5
17 4
125
150
25
30
21
26
ns
output pulse width
t_W
nQ = HIGH
450
−
−
µs
nQ = LOW
output pulse width
t_W
nQ = HIGH
75
−
−
ns
nQ = LOW
t_rt
retrigger time
nA, nB
110
−
−
ns
R_EXT
external timing
resistor
10
2
1000
1000
−
−
kΩ
C_EXT
external timing
capacitor
no limits
pF
2.0
4.5
6.0
C_EXT = 0 pF;
R_EXT = 5 kΩ
2.0
4.5
6.0
C_EXT = 0 pF;
R_EXT = 5 kΩ
2.0
4.5
6.0
C_EXT = 0 pF;
R_EXT = 5 kΩ
2.0
4.5
6.0
C_EXT = 0 pF;
R_EXT = 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
C_EXT = 100 nF;
5.0 R_EXT = 10 kΩ;
Figs 7 and 8
C_EXT = 0 pF;
5.0 R_EXT = 5 kΩ;
note 1; Figs 7 and 8
C_EXT = 0 pF;
5.0 R_EXT = 5 kΩ;
note 2; Fig.7
2.0
5.0
Fig.9
5.0 Fig.9; note 3
1998 Jul 08
6