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PDF ( 数据手册 , 数据表 ) F4047B

零件编号 F4047B
描述 HCF4047B
制造商 ST Microelectronics
LOGO ST Microelectronics LOGO 


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F4047B 数据手册, 描述, 功能
HCF4047B
LOW POWER MONOSTABLE/ASTABLE MULTIVIBRATOR
s LOW POWER CONSUMPTION : SPECIAL
CMOS OSCILLATOR CONFIGURATION
s MONOSTABLE (one - shot) OR ASTABLE
www.DataSheet4U.com(free-running) OPERATION
s TRUE AND COMPLEMENTED BUFFERED
OUTPUTS
s ONLY ONE EXTERNAL R AND C REQUIRED
s BUFFERED INPUTS
s QUIESCENT CURRENT SPECIFIED UP TO
20V
s STANDARDIZED, SYMMETRICAL OUTPUT
CHARACTERISTICS
s 5V, 10V AND 15V PARAMETRIC RATINGS
s INPUT LEAKAGE CURRENT
II = 100nA (MAX) AT VDD = 18V TA = 25°C
s 100% TESTED FOR QUIESCENT CURRENT
s MEETS ALL REQUIREMENTS OF JEDEC
JESD13B " STANDARD SPECIFICATIONS
FOR DESCRIPTION OF B SERIES CMOS
DEVICES"
DESCRIPTION
The HCF4047B is a monolithic integrated circuit
fabricated in Metal Oxide Semiconductor
technology available in DIP and SOP packages.
The HCF4047B consist of a gatable astable
multivibrator with logic techniques incorporated to
DIP SOP
ORDER CODES
PACKAGE
TUBE
DIP
SOP
HCF4047BEY
HCF4047BM1
T&R
HCF4047M013TR
permit positive or negative edge-triggered
monostable multivibrator action with retriggering
and external counting options. Inputs include
+TRIGGER -TRIGGER, ASTABLE, ASTABLE,
RETRIGGER, and EXTERNAL RESET. Buffered
outputs are Q, Q and OSCILLATOR. In all modes
of operation, an external capacitor must be
connected between C-Timing and RC-Common
terminals, and an external resistor must be
connected between the R-Timing and
RC-Common terminals.
For operating modes see functional terminal
connections and application notes.
PIN CONNECTION
September 2001
1/12







F4047B pdf, 数据表
HCF4047B
Where tM = monostable mode pulse width. Values
for tM are as follows :
Typ : VTR = 0.5 VDD tM = 2.48 RC
Min : VTR = 0.33 VDD tM = 2.71 RC
Max : VTR = 0.67 VDD tM = 2.48 RC
Thus if tM = 2.48 RC is used, the maximum
variation will be (+ 9.3%, - 0.0%).
Note : In the astable mode, the first positive half
cycle has a duration of TM ; succeeding durations
are tA/2.
In addition to variations from unit to unit, the
www.DataSheet4U.cmomonostable pulse width may vary as a function of
frequency with respect to VDD and temperature.
4 - RETRIGGER MODE
The HCF4047B can be used in the retrigger mode
FIGURE A : Retrigger-mode waveforms
to extend the output-pulse duration, or to compare
the frequency of an input signal with that of the
internal oscillator. In the retrigger mode the input
pulse is applied to terminals 8 and 12, and the
output is taken from terminal 10 or 11. As shown in
fig.A normal monostable action is obtained when
one retrigger pulse is applied. Extended pulse
duration is obtained when more than one pulse is
applied. For two input pulses, tRE = t1’ + t1 + 2t2.
For more than two pulses, tRE (Q OUTPUT)
terminates at some variable time tD after the
termination of the last retrigger pulse. tD is variable
because tRE (Q OUTPUT) terminates after the
second positive edge of the oscillator output
appears at flip-flop 4 (see logic diagram).
5 - EXTERNAL COUNTER OPTION
Time tM can be extended by any amount with the
use of external counting circuitry. Advantages
include digitally controlled pulse duration, small
timing capacitors for long time periods, and
extremely fast recovery time.
A typical implementation is shown in fig. B. The
pulse duration at the output is
text = (N - 1) (tA) + (tM + tA/2)
Where text = pulse duration of the circuitry, and N
is the number of counts used.
FIGURE B : Implementation of external counter option
8/12














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