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DM54123 데이터시트(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 DM54123
상세설명  Dual Retriggerable One-Shot with Clear and Complementary Outputs
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM54123 데이터시트(HTML) 3 Page - National Semiconductor (TI)

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Switching Characteristics at VCC e 5V and TA e 25 C
DM54123
DM74123
Symbol
Parameter
From (Input)
CL e 15 pF RL e 400X
CL e 15 pF RL e 400X
Units
To (Output)
CEXT e 0 pF REXT e 5kX
CEXT e 1000 pF REXT e 10 KX
Min
Max
Min
Max
tPLH
Propagation Delay Time
A to Q
33
33
ns
Low to High Level Output
tPLH
Propagation Delay Time
B to Q
28
28
ns
Low to High Level Output
tPHL
Propagation Delay Time
A to Q
40
40
ns
High to Low Level Output
tPHL
Propagation Delay Time
BtoQ
36
36
ns
High to Low Level Output
tPLH
Propagation Delay Time
Clear to Q
40
40
ns
Low to High Level Output
tPHL
Propagation Delay Time
Clear to Q
27
27
ns
High to Low Level Output
tW(out)
Output Pulse Width
A or B to Q
308
376
308
376
m
s
CECT e 1000 pF REXT e 10 kX
Operating Rules
1 An external resistor (RX) and external capacitor (CX) are
required for proper operation The value of CX may vary
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 capaci-
tors If the timing capacitors have leakages approaching
100 nA or if stray capacitance from either terminal to
ground is greater than 50 pF the timing equations may
not represent the pulse width the device generates
2 When an electrolytic capacitor is used for CX a switching
diode is often required for standard TTL one-shots to pre-
vent high inverse leakage current
(Figure 1) However its
use in general is not recommended with retriggerable op-
eration
3 The output pulse width (TW) for CX l 1000 pF is defined
as follows
TW e KRX CX (1 a 07RX)
where RX is in Kilo-ohm
CX is in pico Farad
TW is in nano second
K
028
TLF6539 – 3
FIGURE 1
4 For CX k 1000 pF see Figure 2 for TW vs CX family
curves with RX as a parameter
Pulse Width vs RX and CX
TLF6539 – 4
FIGURE 2
5 To obtain variable pulse width by remote trimming the
following circuit is recommended
TLF6539 – 5
Note
‘‘Rremote’’ should be as close to the one-shot as possible
FIGURE 3
3


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