CD4541 :CMOS Programmable Timer High Voltage Types (20V Rating)

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CD4541B programmable timer consists of a 16-stage binary
counter, an oscillator that is controlled by external R-C components (2 resistors and a capacitor), an automatic power-on
reset circuit, and output control logic. The counter increments
on positive-edge clock transitions and can also be reset via the


• Low Symmetrical Output Resistance, Typically 100Ω
at VDD = 15V
• Built-In Low-Power RC Oscillator
• Oscillator Frequency Range . . . . . . . . . . DC to 100kHz
• External Clock (Applied to Pin 3) can be Used Instead
of Oscillator
• Operates as 2N Frequency Divider or as a SingleTransition Timer
• Q/Q Select Provides Output Logic Level Flexibility
• AUTO or MASTER RESET Disables Oscillator During
Reset to Reduce Power Dissipation
• Operates With Very Slow Clock Rise and Fall Times
• Capable of Driving Six Low Power TTL Loads, Three
Low-Power Schottky Loads, or Six HTL Loads Over
the Rated Temperature Range
• Symmetrical Output Characteristics
• 100% Tested for Quiescent Current at 20V
• 5V, 10V, and 15V Parametric Ratings
• Meets All Requirements of JEDEC Standard No. 13B,
“Standard Specifications for Description of ‘B’ Series
CMOS Devices”

Applications :


Figure 1: Programmable timer

The main element of the system is the integrated programmable timer – type chip 4541. In the proposed solution it has been configured to operate as a switch with an adjustable delay time. resistors R1, R2, PR1 and the capacitor C3 are elements of the system the internal oscillator U1, they affect the length of the measured delay. Potentiometer PR1 can be calibrated. From the output Q of the system U1 through the resistor R3 and the transistor T1 then load switching relay controlled. The diode D2 protects the transistor from damage when switching relay PK1, and the LED indicates it work. circuit assembly is typical and should not cause problems. The device must be powered by 12 V from the power source, battery or accumulator. In the copy of the model used by the relay with the permissible load current 8 And in 230 VAC.

Farees Ahmed

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