DM54123W Fairchild Semiconductor, DM54123W Datasheet - Page 4

• Manufacturer Part Number: DM54123W
• Manufacturer: Fairchild Semiconductor

Specifications of DM54123W

• Lead Free Status / RoHS Status: Supplier Unconfirmed

www.fairchildsemi.com
Symbol
t
t
t
t
t
t
t
PLH
PLH
PHL
PHL
PLH
PHL
W(out)
at V
Switching Characteristics
Note 7: C
Operating Rules
1.
2.
3.
CC
required for proper operation. The value of C
from 0 to any necessary value. For small time constants
high-grade mica, glass, polypropylene, polycarbonate,
or polystyrene material capacitors may be used. For
large time constants use tantalum or special aluminum
capacitors. If the timing capacitors have leakages ap-
proaching 100 nA or if stray capacitance from either ter-
minal to ground is greater than 50 pF the timing equa-
tions may not represent the pulse width the device
generates.
ing diode is often required for standard TTL one-shots to
prevent high inverse leakage current ( Figure 1 ). How-
ever, its use in general is not recommended with retrig-
gerable operation.
as follows:
A. where: [R
An external resistor (R
The output pulse width (T
When an electrolytic capacitor is used for C
T
= 5V and T
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Propagation Delay Time
High to Low Level Output
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Output Pulse Width
(Note 7)
W
ECT
[C
[T
[K
= K R
= 1000 pF, R
W
X
is in pico Farad]
is in nano second]
0.28]
Parameter
X
X
A
C
is in Kilo-ohm]
X
= 25˚C
(1 + 0.7/R
EXT
FIGURE 1.
= 10 k
X
) and external capacitor (C
W
) for C
X
)
DS006539-3
X
>
From (Input)
To (Output)
A or B to Q
Clear to Q
Clear to Q
1000 pF is defined
A to Q
B to Q
A to Q
B to Q
X
X
may vary
a switch-
X
) are
C
C
EXT
L
3.08
Min
= 15 pF, R
4
= 0 pF, R
DM54123
4. For C
5. To obtain variable pulse width by remote trimming, the
Note: “R
curves with R
following circuit is recommended:
EXT
L
remote
= 400
Max
3.76
X
= 5 k
33
28
40
36
40
27
” should be as close to the one-shot as possible.
<
1000 pF see Figure 2 for T
Pulse Width vs R
X
as a parameter:
C
EXT
FIGURE 2.
FIGURE 3.
C
3.08
Min
L
= 1000 pF, R
= 15 pF, R
DM74123
X
and C
L
EXT
= 400
DS006539-5
X
W
DS006539-4
Max
3.76
= 10 K
33
28
40
36
40
27
vs C
X
family
Units
ns
ns
ns
ns
ns
ns
µs