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54121 Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. 54121
Description  One-Shot with Clear and Complementary Outputs
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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54121 Datasheet(HTML) 3 Page - National Semiconductor (TI)

   
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Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Outout Load)
Symbol
Parameter
From (Input)
Conditions
Min
Max
Units
To (Output)
tPLH
Propagation Delay Time
A1 A2
CEXT e 80 pF
70
ns
Low to High Level Output
to Q
RINT to VCC
tPLH
Propagation Delay Time
B to
CL e 15 pF
55
ns
Low to High Level Output
Q
RL e 400X
tPHL
Propagation Delay Time
A1 A2
80
ns
High to Low Level Output
to Q
tPHL
Propagation Delay Time
B
65
ns
High to Low Level Output
to Q
tW(OUT)
Output Pulse
A1 A2 or B
CEXT e 80 pF
Width Using the
to Q Q
RINT to VCC
70
150
ns
Internal Timing Resistor
RL e 400X
CL e 15 pF
tW(OUT)
Output Pulse
A1 A2
CEXT e 0pF
Width Using Zero
to Q Q
RINT to VCC
50
ns
Timing Capacitance
RL e 400X
CL e 15 pF
tW(OUT)
Output Pulse
A1 A2
CEXT e 100 pF
Width Using External
to Q Q
RINT e 10 kX
600
800
ns
Timing Resistor
RL e 400X
CL e 15 pF
A1 A2
CEXT e 1 mF
to Q Q
RINT e 10 kX
68ms
RL e 400X
CL e 15 pF
Operating Rules
1 To use the internal 2 kX timing resistor connect the RINT
pin to VCC
2 An external resistor (RX) or the internal resistor (2 kX)
and an external capacitor (CX) are required for proper
operation The value of CX may vary from 0 to any neces-
sary value For small time constants use high-quality
mica glass polypropylene polycarbonate or polystyrene
capacitors For large time constants use solid tantalum or
special aluminum capacitors If the timing capacitors
have leakages approaching 100 nA or if stray capaci-
tance from either terminal to ground is greater than 50 pF
the timing equations may not represent the pulse width
the device generates
3 The pulse width is essentially determined by external tim-
ing components RX and CX For CX k 1000 pF see Fig-
ure 1 design curves on TW as function of timing compo-
nents value For CX l1000 pF the output is defined as
tW e KRX CX
where RX is in Kilo-ohm
CX is in pico Farad
TW is in nano second
K
07
TLF6538 – 2
FIGURE 1
4 If CX is an electrolytic capacitor a switching diode is often
required for standard TTL one-shots to prevent high in-
verse leakage current
(Figure 2)
TLF6538 – 3
FIGURE 2
3


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