HCF4541B Datasheet | STMicroelectronics

HCC4541B HCF4541B PROGRAMMABLE TIMER 16 STAGE BINARI COUNTER LOW SYMMETRICAL OUTPUT RESISTANCE, TYPICALLY 100 OHM AT VDD = 15V OSCILLATOR FREQUENCY RANGE : DC TO 100k Hz AUTO OR MASTER RESET DISABLES OSCILLATOR DURING RESET TO REDUCE POWER DISSIPATION OPERATES WITH VERY SLOW CLOCK RISE AND FALL TIMES BUILT-IN LOW-POWER RC OSCILLATOR EXTERNAL CLOCK (applied to pin 3) CAN BE USED INSTEAD OF OSCILLATOR OPERATES AS 2N FREQUENCY DIVIDER OR AS A SINGLE-TRANSITION TIMER Q/Q SELECT PROVIDES OUTPUT LOGIC LEVEL FLEXIBILITY CAPABLE OF DRIVING SIX LOW POWER TTL LOADS, THREE LOW-POWER SCHOTTKY LOADS, PR SIX HTL LOADS OVER THE RATED TEMPERATURE RANGE SYMMETRICAL OUTPUT CHARACTERISTICS 100% TESTED FOR QUIESCENT CURRENT AT 20V 5-10-15V PARAMETRIC RATINGS MEETS ALL REQUIREMENTS OF JEDEC TENTATIVE STANDARD N 13A, ”STANDARD SPECIFICATIONS FOR DESCRIPTION OF ’ B ’ SERIES CMOS DEVICES” DESCRIPTION The HCC/HCF4541B Programmable Timer is posed of a 16-stage 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 transation 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 timeselect inputs A or B (see frequency selection table). The output is available in one of the two modes that can be selected via the MODE input, pin 10 (see truth table). The output turns out as a continuous square wave, with a frequency equal to the oscillator frequency divided by 2N. When this MODE input is November 1996 1/11 EY (Plastic Package) F (Ceramic Frit Seal Package) M1 C1 (Micro Package) (Plastic Chip Carrier) ORDER CODES : HCC4541 BF HCF4541 BM1 HCF4541 BEY HCF4541 BC1 PIN CONNECTION (top view) HCC/HCF4541B a logic ” 1 ”, when it is a logic ” 0 ” and after a MASTER RESET is started, and Q output has been selected, the output goes up to a...