Tesis previa a la obtención del -titulo de Ingeniero Electrónico en la ...

TYPES SN54122, SN74122. SN54123, SN74123
SN54L122, SN74L122, SN54L123, SN74L123,
RETRIGGERABLE MOrNOSTABLE MULTIVIBRATORS
TYPICAL APPLICATION DATA FOR '122. '123, 'L122, 'L123
Por pulse widths when Cexl < ]OOQ pF, See
'Figures 4 and 5.
.The ouiput pulse ¡s prirnarily a function of the
externa! capacitor and resistor. For Cext > 1000 pF,
che outout pulse width (tw) is defined as:
where
tw -
. 0.7
HT • cext ( i -f—
K is 0.32 for '122, 0.28 for '123,
0.37 for ' L1 22, 0.33 for ' L1 23
RT ¡s ín kH {iniernal or external timing resistance.
CexlisinpF
tw ¡s in nanoseconds
To prevent reverse voltage across C.»xt, it is recommended
that the method shown in Figure 2 be
employed when using electrolytíc capacitor* and in
aoplications utilizing the clear function. In all applications
using ihe diode, the pulse width is:
¡s 0.28 for '122, 0.25 for '123,
0.33 for 'L122, 0.29 for 'L123
erminal terminal
/ 0.7 \w = KD • RT ' cext i +—
Rext c °-s R-xtÍTWX-
(Siíe rccommended ocwraiing
conditíom (or Hextmax.)
Any si I ¡con switching díoda
-- «Jchai 1N916. lN3064.etc.
TIMING COMPONENT CONNECTIONS WHEN
CBX, > 100Q p F AND CLEAR IS USEO
FIGURÉ2
Applications requiring more precís* pulsa wíchhs (up
, to 28 seconds) and not requiríng the clear feature can
|best be satísfied with the '121 or'L121.
TEXAS INSTRUMENTS
«L.L». TíX-S Til
T'
To Cext To Re^,/Cex,
lerminal terminal
TIMING COMPONENT CONNECT1ONS
FIGURE3
•122, MÍ3
TYPICAU OUTPUT PULSE WIDTH
vi
EXTERNAUTIMING CAPACITANCE
•um
TYP1CAL OUTPUT PUUSS WIDTH
EXTERNALTIMING CAPACITANCE
i i iiiiiii ¡ i liiiiir"". :sv"
Z 4 10 M
C^f-exirrr^ r«iw^ C
FIGURES
ur« r«o9* oí tfi«
toa a» uxt icoo
n r*cofnm«nd«
odSNS^L-círeutt.