Datasheet

SN54AHCT123A, SN74AHCT123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS420G – JUNE 1998 – REVISED APRIL 2003
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
†
Figure 7
MINIMUM TRIGGER TIME
vs
V
CC
CHARACTERISTICS
R
T
= 1 kΩ
T
A
= 25°C
10.00
0
1.00
0.10
0.01
12 3456
C
T
= 0.01 µF
C
T
= 1000 pF
C
T
= 100 pF
V
CC
– Supply Voltage – V
Minimum Retrigger Time–
µ
s
rr
– t
Figure 8
1.20
1.15
1.10
1.05
1.00
0.95
0.90
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
R
T
= 10 kΩ
T
A
= 25°C
t
W
= K × C
T
× R
T
V
CC
– Supply Voltage – V
OUTPUT PULSE-DURATION CONSTANT
vs
SUPPLY VOLTAGE
Output Pulse-Duration Constant – K
C
T
= 1000 pF
C
T
= 0.01 µF
C
T
= 0.1 µF
Figure 9
1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50
0.00001
0.0001
0.001
T
A
= 25°C
V
CC
= 5 V
For Capacitor Values of
0.001 µF or Greater,
K = 1.0
(K is Independent of R)
Multiplier Factor – K
EXTERNAL CAPACITANCE
vs
MULTIPLIER FACTOR
C
T
– External Capacitor Value –
µ
F
Figure 10
t
w
– Output Pulse Duration
Relative Frequency of Occurance
DISTRIBUTION OF UNITS
vs
OUTPUT PULSE DURATION
Mean = 856 ns
Median = 856 ns
Std. Dev. = 3.5 ns
V
CC
= 5 V
T
A
= 25°C
C
T
= 50 pF
R
T
= 10 k
–3 Std. Dev. +3 Std. Dev.
Median
99% of Data Units
†
Operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.