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TLC556 Datasheet, PDF (11/18 Pages) Texas Instruments – DUAL LinCMOSE TIMERS | |||
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TLC556, TLC556Y
DUAL LinCMOS⢠TIMERS
SLFS047B â FEBRUARY 1984 â REVISED SEPTEMBER 1997
APPLICATION INFORMATION
The preceding equations and those given earlier are similar in that a time constant is multiplied by the logarithm
of a number or function. The limit values of the logarithmic terms must be between In 2 at low frequencies and
In 3 at extremely high frequencies. For a duty cycle close to 50%, an appropriate constant for the logarithmic
) terms can be substituted with good results. Duty cycles less than 50% tH will require that tH < 1 and
tH tL
tL
possibly RA ⤠ron. These conditions can be difficult to obtain.
In monostable applications, the trip point of the trigger input can be set by a voltage applied to CONT. An input
voltage between 10% and 80% of the supply voltage from a resistor divider with at least 500-µA bias provides
good results.
⢠POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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