HCF4541 Programmable Timer - STMicroelectronics - #1

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September 2002 1/10 n 16 STAGE BINARY COUNTER n LOW SYMMETR. OUTPUT RESISTANCE, TYPICALLY 100W at VDD = 15V n OSCILLATOR FREQUENCY RANGE : DC to 100KHz n AUTO OR MASTER RESET DISABLES OSCILLATOR DURING RESET TO REDUCE POWER DISSIPATION n OPERATES WITH VERY SLOW CLOCK RISE AND FALL TIMES n BUILT-IN LOW-POWER RC OSCILLATOR n EXTERNAL CLOCK (applied to pin 3) CAN BE USED INSTEAD OF OSCILLATOR n OPERATES AS 2n FREQUENCY DIVIDER OR AS A SINGLE-TRANSITION TIMER n Q/Q SELECT PROVIDES OUTPUT LOGIC LEVEL FLEXIBILITY n CAPABLE OF DRIVING SIX LOW POWER TTL LOADS, THREE LOW POWER SCHOTTKY LOADS, OR SIX HTL LOADS OVER THE RATED TEMP. RANGE n 5V, 10V AND 15V PARAMETRIC RATINGS n 100% TESTED FOR QUIESCENT CURRENT AT 20V n MEETS ALL REQUIREMENTS OF JEDEC JESD13B " STANDARD SPECIFICATIONS FOR DESCRIPTION OF B SERIES CMOS DEVICES" DESCRIPTION The HCF4541B is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology available in DIP and SOP packages. This device is composed of a 16-stages binary counter, an oscillator controlled by 2 external resistors and a capacitor, an output control logic and an automatic power-on reset circuit. The counter varies on positive-edge clock transition and it can be cleared by the MASTER RESET input. The output from this timer is the Q or Q output from the 8th, 13th, or 16th counter stage. The choice of the stage depends on the time HCF4541B PROGRAMMABLE TIMER PIN CONNECTION ORDER CODES PACKAGE TUBE T & R DIP HCF4541BEY SOP HCF4541BM1 HCF4541M013TR DIP SOP