14521BG View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
14521BG Datasheet PDF : 9 Pages
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PULSE
GENERATOR
MC14521B
VDD
VDD
VDD′
Q18
IN 2
IN 2 Q19
CL
Q20
CL
Q21
CL
Q22
CL
R Q23
Q24
CL
CL
Qn
CL
VSS
VSS′
20 ns
20 ns
90%
10%
50%
tWL
tWH
90%
50%
10%
tPLH
tTLH
20 ns
tPHL
tTHL
Figure 2. Switching Time Test Circuit and Waveforms
VDD
Ro
R*
18 M
VDD VDD′
IN 1 OUT 1
OUT 2
Q18
Q19
IN 2 Q20
Q21
Q22
CS
CT
Q23
R Q24
VSS VSS′
R*
*Optional for low power operation,
10 kW ≤ R ≤ 70 kW.
Figure 3. Crystal Oscillator Circuit
Characteristic
500 kHz 50 kHz
Circuit Circuit Unit
Crystal Characteristics
Resonant Frequency
Equivalent Resistance, RS
500
50
kHz
1.0
6.2
kW
External Resistor/Capacitor Values
Ro
CT
CS
Frequency Stability
Frequency Change as a Function
of VDD (TA = 25_C)
VDD Change from 5.0 V to 10 V
VDD Change from 10 V to 15 V
47
750
kW
82
82
pF
20
20
pF
+ 6.0
+ 2.0
+ 2.0
ppm
+ 2.0
ppm
Frequency Change as a Function
– 4.0
– 2.0
ppm
of Temperature (VDD = 10 V)
+ 100
+ 120
ppm
TA Change from – 55_C to + 25_C
MC14521 only
Complete Oscillator*
TA Change from + 25_C to + 125_C
MC14521 only
– 2.0
– 160
– 2.0
ppm
– 560 ppm
Complete Oscillator*
*Complete oscillator includes crystal, capacitors, and resistors.
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Figure 4. Typical Data for Crystal Oscillator Circuit
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