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| CD4047BMS Datasheet, PDF (13/15 Pages) Intersil Corporation – CMOS Low-Power Monostable/Astable Multivibrator | |||
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CD4047BMS
Typical Performance Characteristics (Continued)
ASTABLE MODE
SUPPLY VOLTAGE (VDD) = 15V
105
C =100pF
C =1000pF
C = 0.01µF
104
C = 0.1µF
C =10pF
103
102
10-1
100
101
102
103
104
105
106
Q OR Q FREQUENCY (F) (Hz)
FIGURE 28. TYPICAL POWER DISSIPATION vs OUTPUT FREQUENCY (VDD = 15V)
Astable Mode Design Information
Unit-to-Unit Transfer Voltage Variations
The following analysis presents variations from unit to unit as
a function of transfer voltage (VTR) shift (33%-67% VDD) for
free running (astable) operation.
TERMINAL 13
TERMINAL 10
t1 t2 t1 t2
tA/2
tA/2
tA
Monostable Mode Design Information
The following analysis presents variations from unit to unit as a
function of transfer voltage (VTR) shift (33% - 67% VDD) for
one shot (monostable) operation.
TERMINAL 8
TERMINAL 13
TERMINAL 10
t1´ t2
tM
t1´ t2
tM
FIGURE 29. ASTABLE MODE WAVEFORMS
FIGURE 30. MONOSTABLE WAVEFORMS
t1 = -RC In
VTR
VDD + VTR ;
typically, t1 = 1.1RC
t1´ = -RC In
VTR
2VDD ;
typically, t1´ = 1.38RC
t2 = -RC In
VDD - VTR
2VDD - VTR ;
typically, t2 = 1.1RC
tA = 2(t1 + t2)
(VTR)(VDD - VTR)
= -2RC In
(VDD + VTR)(2VDD - VTR)
Typ: VTR = 0.5VDD
Min: VTR = 0.33VDD
Max: VTR = 0.67VDD
tA = 4.40RC
tA = 4.62RC
tA = 4.62RC
thus if tA = 4.40RC is used, the variation will be +5%, -0%
due to variations in transfer voltage.
Variations Due to VDD and Temperature Changes
In addition to variations from unit to unit, the astable period
varies with VDD and temperature, Typical variations are pre-
sented in graphical form in Figures 11 to 18 with 10V as ref-
erence for voltage variations curves and +25oC as reference
for temperature variations curves.
tM = (t1´ + t2)
tM = -RC In
(VTR)(VDD - VTR)
(2VDD - VTR)(2VDD)
where tM = Monostable mode pulse width.
Values for tM are as follows:
Typ: VTR = 0.5VDD
Min: VTR = 0.33VDD
Max: VTR = 0.67VDD
tM = 2.48RC
tM = 2.71RC
tM = 2.48RC
thus if tM = 2.48RC is used, the variation will be +9.3%,
-0% due to variations in transfer voltage.
NOTES:
1. In the astable mode, the ï¬rst positive half cycle has a duration of
tM; succeeding durations are tA/s.
2. In addition to variations from unit to unit, the monostable pulse
width varies with VDD and temperature. These variations are
presented in graphical form in Figures 19 to 26 with 10V as ref-
erence for voltage variation curves and +25oC as reference for
temperature variation curves.
7-909
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