TLC556, TLC556Y

DUAL LinCMOS

™ TIMERS

SLFS047B – FEBRUARY 1984 – REVISED SEPTEMBER 1997

11

POST OFFICE BOX 655303

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%

t

H

t

H )

t

L

will require that

t

H

t

L

< 1 and

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.