HEF4047BP ,Monostable/astable multivibrator
HEF4047BP ,Monostable/astable multivibrator
HEF4047BP ,Monostable/astable multivibrator
HEF4049BD ,HEX inverting buffersINTEGRATED CIRCUITSDATA SHEETFor a complete data sheet, please also download:• The IC04 LOCMOS HE40 ..
HEF4049BD ,HEX inverting buffersLogic diagram (one gate).APPLICATION INFORMATIONSome examples of
HEF4049BD ,HEX inverting buffersLogic diagram (one gate).APPLICATION INFORMATIONSome examples of
HM6208HP-45 , 65,536-word ´ 4-bit High Speed CMOS Static RAM
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HM6216255HLJP-10 , 4M high Speed SRAM (256-kword x 16-bit)
HEF4047BP
Monostable/astable multivibrator
Philips Semiconductors Product specification
Monostable/astable multivibrator HEF4047B
MSI
DESCRIPTIONThe HEF4047B consists of a gatable astable multivibrator
with logic techniques incorporated to permit positive or
negative edge-triggered monostable multivibrator action
with retriggering and external counting options.
Inputs include + TRIGGER, − TRIGGER, ASTABLE,
ASTABLE, RETRIGGER and MR (Master Reset).
Buffered outputs are O,O and OSCILLATOR OUTPUT. In
all modes of operation an external capacitor (Ct) must be
connected between CTC and RCTC, and an external
resistor (Rt) must be connected between RTC and
RCTC (continued on next page).
FAMILY DATA, IDD LIMITS category MSISee Family Specifications
Philips Semiconductors Product specification
Monostable/astable multivibrator HEF4047B
MSI
Astable operation is enabled by a HIGH level on the
ASTABLE input. The period of the square wave at O and outputs is a function of the external components
employed. ‘True’ input pulses on the ASTABLE or
‘complement’ pulses on the ASTABLE input, allow the
circuit to be used as a gatable multivibrator. The
OSCILLATOR OUTPUT period will be half of the O output
in the astable mode. However, a 50% duty factor is not
guaranteed at this output.
In the monostable mode, positive edge-triggering is
accomplished by applying a leading-edge pulse to the TRIGGER input and a LOW level to the − TRIGGER
input. For negative edge-triggering, a trailing-edge pulse is
applied to the − TRIGGER and a HIGH level to the TRIGGER. Input pulses may be of any duration relative
to the output pulse. The multivibrator can be retriggered
(on the leading-edge only) by applying a common pulse to
both the RETRIGGER and + TRIGGER inputs. In this
mode the output pulse remains HIGH as long as the input
pulse period is shorter than the period determined by the
RC components.
An external count down option can be implemented by
coupling O to an external ‘N’ counter and resetting the
counter with the trigger pulse. The counter output pulse is
fed back to the ASTABLE input and has a duration equal
to N times the period of the multivibrator. A HIGH level on
the MR input assures no output pulse during an ON-power
condition. This input can also be activated to terminate the
output pulse at any time. In the monostable mode, a HIGH
level or power-ON reset pulse must be applied to MR,
whenever VDD is applied.
HEF4047BP(N): 14-lead DIL; plastic
(SOT27-1)
HEF4047BD(F): 14-lead DIL; ceramic (cerdip)
(SOT73)
HEF4047BT(D): 14-lead SO; plastic
(SOT108-1)
( ): Package Designator North America
Philips Semiconductors Product specification
Monostable/astable multivibrator HEF4047B
MSI
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Philips Semiconductors Product specification
Monostable/astable multivibrator HEF4047B
MSI
FUNCTIONAL CONNECTIONS
Notes Input pulse to RESET of external counting chip; external counting chip output to pin 4. In all cases, external resistor between pins 2 and 3, external capacitor between pins 1 and 3.
DC CHARACTERISTICSVSS=0 V; inputs at VSS or VDD
Philips Semiconductors Product specification
Monostable/astable multivibrator HEF4047B
MSI
AC CHARACTERISTICSVSS= 0 V; Tamb =25 °C;CL = 50 pF; input transition times≤ 20 ns
Philips Semiconductors Product specification
Monostable/astable multivibrator HEF4047B
MSI
APPLICATION INFORMATION
General features: Monostable (one-shot) or astable (free-running)
operation True and complemented buffered outputs Only one external R and C required
Monostable multivibrator features: Positive- or negative-edge triggering Output pulse width independent of trigger pulse duration Retriggerable option for pulse-width expansion Long pulse width possible using small RC components
by means of external counter provision Fast recovery time essentially independent of pulse
width Pulse-width accuracy maintained at duty cycles
approaching 100%
Astable multivibrator features: Free-running or gatable operating modes 50% duty cycle Oscillator output available
Philips Semiconductors Product specification
Monostable/astable multivibrator HEF4047B
MSI
1. Astable mode design informationa. Unit-to-unit transfer-voltage variations
The following analysis presents worst-case variations from unit-to-unit as a function of transfer-voltage (VTR) shift for free
running (astable) operation.
Values for tA are:
thus if
tA = 4,40 RtCt is used, the maximum variation will be (+ 7,0%; −0,0%) at 10 V.
typ.: VTR= 0,5 VDD;tA= 4,40 RtCt
VDD= 5 or 10 V min.: VTR= 0,3 VDD;tA= 4,71 RtCt
max.: VTR= 0,7 VDD;tA= 4,71 RtCt
VDD= 15 V min.: VTR =4 V; tA= 4,84 RtCt
max.: VTR= 11 V; tA= 4,84 RtCt1 RtCtIn VTRDD VTR+ ----------------------------–=2 RtCtInDD VTR–DD VTR– -------------------------------–=A 2t1t2+() 2RtCtIn VTR()VDD VTR– ()DD VTR+ () 2VDD VTR– ()-------------------------------------------------------------------------, wheretA Astable mode pulse width.=–==
