74HC423 Datasheet, PDF (7/14 Pages) NXP Semiconductors – Dual retriggerable monostable multivibrator with reset

Philips Semiconductors
Dual retriggerable monostable
multivibrator with reset
Product specification
74HC/HCT423
DC CHARACTERISTICS FOR 74HCT
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
Note to HCT types
The value of additional quiescent supply current (∆I_CC) for a unit load of 1 is given in the family specifications.
To determine ∆I_CC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
nA, nB
nR_D
UNIT LOAD COEFFICIENT
0.35
0.50
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
V_CC
(V)
min. typ. max. min. max. min. max.
WAVEFORMS/
NOTES
t_PHL/ t_PLH propagation delay
nA, nB to nQ, nQ
30 51
64
77 ns
4.5 C_EXT = 0 pF;
R_EXT = 5 kΩ
t_PHL/ t_PLH propagation delay
nR_D to nQ, nQ
26 48
60
72 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
20 5
nA = LOW
25
30
ns
4.5 Fig.7
t_W
trigger pulse width
20 5
nB = HIGH
25
30
ns
4.5 Fig.7
t_W
reset pulse width
20 7
25
30
ns
4.5 Fig.8
nR_D = LOW
t_W
output pulse width
nQ = HIGH
nQ = LOW
450
−
−
µs
5.0 C_EXT = 100 nF;
R_EXT = 10 kΩ;
Figs 7 and 8
t_W
output pulse width
nQ = HIGH
nQ = LOW
75
−
−
ns
5.0 C_EXT = 0 pF;
R_EXT = 5 kΩ;
note 1; Figs 7 and
8
t_rt
retrigger time
nA, nB
110
−
−
ns
5.0 C_EXT = 0 pF;
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
7