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HCF4541 Datasheet

  • HCF4541

  • PROGRAMMABLE TIMER

  • 178.93KB

  • STMicroelectronics   STMicroelectronics

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HCC4541B
HCF4541B
PROGRAMMABLE TIMER
16 STAGE BINARI COUNTER
LOW SYMMETRICAL OUTPUT RESISTANCE,
TYPICALLY 100 OHM AT V
DD
= 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, 鈥漇TANDARD SPE-
CIFICATIONS FOR DESCRIPTION OF 鈥?B 鈥?/div>
SERIES CMOS DEVICES鈥?/div>
DESCRIPTION
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
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)

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