74HC123 Datasheet, PDF (8/17 Pages) NXP Semiconductors – Dual retriggerable monostable multivibrator with reset

Philips Semiconductors
Dual retriggerable monostable
multivibrator with reset
Product specification
74HC/HCT123
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
T_amb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HCT
+25
−40 to +85
−40 to +125
UNIT _VCC
(V)
min. typ. max. min. max. min. max.
WAVEFORMS/
NOTES
t_PHL
propagation delay
nR_D, nA, nB to nQ
30 51
64
77
ns
4.5
C_EXT = 0 pF;
R_EXT = 5 kΩ
t_PLH
propagation delay
nR_D, nA, nB to nQ
28 51
64
77
ns
4.5
C_EXT = 0 pF;
R_EXT = 5 kΩ
t_PHL
propagation delay
nR_D to nQ (reset)
27 46
58
69
ns
4.5
C_EXT = 0 pF;
R_EXT = 5 kΩ
t_PLH
propagation delay
nR_D to nQ (reset)
23 46
58
69
ns
4.5
C_EXT = 0 pF;
R_EXT = 5 kΩ
t_THL / t_TLH output transition time
7 15
19
22 ns 4.5
t_W
trigger pulse width
nA = LOW
20 3
25
30
ns 4.5 Fig.7
t_W
trigger pulse width
nB = HIGH
20 5
25
30
ns 4.5 Fig.7
t_W
reset pulse width
nR_D = LOW
20 7
25
30
output pulse width
t_W
nQ = HIGH
nQ = LOW
450
−
−
ns 4.5 Fig.8
C_EXT = 100 nF;
µs 5.0 R_EXT = 10 kΩ;
Figs 7 and 8
output pulse width
t_W
nQ = HIGH
75
−
−
nQ = LOW
C_EXT = 0 pF;
ns 5.0 R_EXT = 5 kΩ;
note 1; Figs 7 and 8
t_rt
retrigger time
nA, nB
110
−
−
C_EXT = 0 pF;
ns 5.0 R_EXT = 5 kΩ;
note 2; Fig.7
R_EXT
external timing
resistor
2
1000 −
−
kΩ 5.0 Fig.9
C_EXT
external timing
capacitor
no limits
pF 5.0 Fig.9; note 3
1998 Jul 08
8