Datasheet

8
Test Circuits and Waveforms
FIGURE 1. OUTPUT PULSE CONTROL USING RESET INPUT
(R) PULSE FOR 123
FIGURE 2. OUTPUT PULSE CONTROL USING RESET INPUT
(R) FOR 423
FIGURE 3. TRIGGERING OF ONE SHOT BY INPUT A OR INPUT B FOR A PERIOD t
W
FIGURE 4. TYPICAL OUTPUT PULSE WIDTH AS A FUNCTION
OF C
X
FOR R
X
= 10kΩ AND 100kΩ
FIGURE 5. TYPICAL “K” FACTOR AS A FUNCTION OF V
CC
B = LOW
A = HIGH
t
W
t
W
V
S
V
S
Q
R
B
A
t
W
t
W
A
B
R
B = LOW
A = HIGH
Q
t
W
V
S
V
S
t
W
t
W
A
B
B
A
Q
t
rT
(R = HIGH)
t
W
t
W
t
W
t
W
N
OTE: Output pulse control using retrigger pulse for 123 and 423.
V
S
OUTPUT PULSE WIDTH (µs)
2
4
6
8
10
3
10
2
10
1
2
4
6
8
2
4
6
8
2
4
6
8
EXTERNAL CAPACITANCE (C
X
) - pF
2468
10
3
10
4
2 4 68 2 4 68 2 4 68
10
5
10
6
10
7
R
X
= 100k
Ω
R
X
= 10k
Ω
DC SUPPLY VOLTAGE (V
CC
) = 5V
AMBIENT TEMPERATURE (T
A
) = 25
o
C
EXTERNAL CAPACITANCE (C
X
) = 10nF
EXTERNAL RESISTANCE (R
X
) = 10kΩ TO 100kΩ
AMBIENT TEMPERATURE (T
A
) = 25
o
C
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
1234 567891011
“K” FACTOR
HCT
DC SUPPLY VOLTAGE (V
CC
) - VOLTS