HCC4541B datasheet(1/11 Pages) STMICROELECTRONICS

Numer części	HCC4541B

Szczegółowy opis	PROGRAMMABLE TIMER

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HCC4541B

HCF4541B

November 1996

PROGRAMMABLE TIMER

EY

(Plastic Package)

16 STAGE BINARI COUNTER

LOW SYMMETRICAL OUTPUT RESISTANCE,

TYPICALLY 100 OHM AT VDD = 15V

OSCILLATOR FREQUENCY RANGE : DC TO

100kHz

AUTO OR MASTER RESET DISABLES OSCIL-

LATOR 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 2

N 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

CHARAC-

TERISTICS

100% TESTED FOR QUIESCENT CURRENT

AT 20V

5-10-15V PARAMETRIC RATINGS

MEETS ALL REQUIREMENTS OF JEDEC TEN-

TATIVE STANDARD N 13A, ”STANDARD SPE-

CIFICATIONS FOR DESCRIPTION OF ’ B ’

SERIES CMOS DEVICES”

ORDER CODES :

HCC4541 BF

HCF4541 BM1

HCF4541 BEY

HCF4541 BC1

F

(Ceramic Frit Seal Package)

M1

(Micro Package)

C1

(Plastic Chip Carrier)

DESCRIPTION

PIN CONNECTION (top view)

The HCC/HCF4541B Programmable Timer is com-

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 MAS-

TER 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-

select 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 2

N. When this MODE input is

1/11

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