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LM2240N Fiches technique(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM2240N
Description  Programmable Timer/Counter
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2240N Fiches technique(HTML) 8 Page - National Semiconductor (TI)

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Astable Operation (Continued)
VCC e Pin 16
TLH10837 – 10
GND e Pin 9
FIGURE 7 Cascaded Operation for Long Delays
Binary Pattern Generation
In astable operation as shown in
Figures 8 and 9 the out-
put of the LM2240 appears as a complex pulse pattern if
more than one of its switches is closed The waveform of
the output pulse train can be determined directly from the
timing diagram of
Figure 2 which shows the phase relations
between the counter outputs
Figures 10 and 11 show some
of the complex pulse patterns that can be generated The
pulse pattern repeats itself at a rate equal to the period of
the highest counter bit connected to the common output
bus The minimum pulse width contained in the pulse train is
determined by the lowest counter bit connected to the out-
put
VCC e Pin 16
GND e Pin 9
TLH10837 – 11
FIGURE 8 Astable Operation
with Trigger and Reset Inputs
VCC e Pin 16
GND e Pin 9
TLH10837 – 12
FIGURE 9 Free Running Astable Operation
TLH10837 – 13
FIGURE 10 Binary Pulse Patterns Obtained
by Shorting Various Counter Outputs
8


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