74HC423 Datasheet, PDF (6/14 Pages) NXP Semiconductors – Dual retriggerable monostable multivibrator with reset

Philips Semiconductors
Dual retriggerable monostable
multivibrator with reset
Product specification
74HC/HCT423
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard (except for nR_EXT /C_EXT)
I_CC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
SYMBOL
PARAMETER
t_PHL/ t_PLH propagation delay
nA, nB to nQ, nQ
t_PHL/ t_PLH propagation delay
nR_D to nQ, nQ
t_THL/ t_TLH output transition time
T_amb (°C)
TEST CONDITIONS
74HC
+25
−40 to +85
−40 to +125
UNIT
V_CC
(V)
min. typ. max min max min. max.
WAVEFORMS/
NOTES
80 255
320
385 ns
2.0 C_EXT = 0 pF;
29 51
64
77
4.5 ^{REXT = 5 kΩ}
23 43
54
65
6.0
66 215
270
325 ns
2.0 C_EXT = 0 pF;
24 43
54
65
4.5 ^{REXT = 5 kΩ}
19 37
46
55
6.0
19 75
95
110 ns 2.0
7 15
19
22
4.5
6 13
16
19
6.0
t_W
trigger pulse width
100 11
nA = LOW
20 4
125
150
25
30
17 3
21
26
t_W
trigger pulse width
100 17
nB = HIGH
20 6
125
150
25
30
17 5
21
26
t_W
reset pulse width
nR_D = LOW
100 14
20 5
125
150
25
30
17 4
21
26
t_W
output pulse width
nQ = HIGH
nQ = LOW
450
−
−
t_W
output pulse width
nQ = HIGH
nQ = LOW
75
−
−
t_rt
retrigger time
nA, nB
110
−
−
R_EXT
external timing resistor 10
1000 −
−
2
1000
C_EXT
external timing capacitor no limits
ns 2.0 Fig.7
4.5
6.0
ns 2.0 Fig.7
4.5
6.0
ns 2.0 Fig.8
4.5
6.0
µs
5.0 C_EXT = 100 nF;
R_EXT = 10 kΩ;
Figs 7 and 8
ns
5.0 C_EXT = 0 pF;
R_EXT = 5 kΩ;
note 1;
Figs 7 and 8
ns
5.0 C_EXT = 0 pF;
R_EXT = 5 kΩ;
note 2; Fig. 7
kΩ 2.0 Fig.9
5.0
pF 5.0 Fig.9; note 3
1998 Jul 08
6