CD54HC4538 Datasheet, PDF (3/11 Pages) Texas Instruments – High Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrator

CD54HC4538, CD74HC4538, CD74HCT4538
V_CC
V_CC
R_X
2(14)
C_X
1(15)
8
V_CC
3(13)
R
4(12)
A
5(11)
B
16
V_CC
HIGH Z
V_CC
D R1 R2 _Q
CL ^FF
CL
Q
V_CC
R1
+ ^{COMP II}
-
R2
V_CC
6(10)
Q
7(9)
Q
FIGURE 2. LOGIC DIAGRAM (1 MONO)
FUNCTIONAL TERMINAL CONNECTIONS
V_CC TO
TERMINAL NUMBER
GND TO
TERMINAL NUMBER
INPUT PULSE TO
TERMINAL NUMBER
OTHER
CONNECTIONS
FUNCTION
Leading-Edge
Trigger/Retriggerable
MONO₁
3, 5
MONO₂
11, 13
MONO₁
MONO₂
MONO₁
4
MONO₂
12
MONO₁
MONO₂
Leading-Edge
3
13
Trigger/Non-Retriggerable
4
12
5-7
11-9
Trailing-Edge
Trigger/Retriggerable
3
13
4
12
5
11
Trailing-Edge
3
13
Trigger/Non-Retriggerable
5
11
4-6
12-10
NOTES:
3. A retriggerable one-shot multivibrator has an output pulse width which is extended one full time period (T) after application of the last
trigger pulse.
4. A non-triggerable one-shot multivibrator has a time period (T) referenced from the application of the first trigger pulse.
FIGURE 3. INPUT PULSE TRAIN
T
FIGURE 4. RETRIGGERABLE MODE
PULSE WIDTH (A MODE)
T
FIGURE 5. NON-RETRIGGERABLE MODE
PULSE WIDTH
(A MODE)
3