
MOTOROLA CMOS LOGIC DATA
MC14568B
6–468
If used in cascade with the programmable divide–by–N
counter, practically all usual reference frequencies, or chan-
nel spacings of 25, 20, 12.5, 10, 6.25 kHz, etc. are easily
achievable.
PROGRAMMABLE DIVIDE–BY–N
4–BIT COUNTER (D2)
This counter is programmable by using inputs DP0 ... DP3
(pins 7 ... 4). The Preset Enable input enables the parallel
preset inputs DP0... DP3. The “0” output must be externally
connected to the PE input for single stage applications.
Since there is not a cascade feedback input, this counter,
when cascaded, must be used as the most significant digit.
Because of this, it can be cascaded with binary counters as
well as with BCD counters (MC14569B, MC14522B,
MC14526B).
TYPICAL APPLICATIONS
Figure 6. Cascading MC14568B and MC14522B or MC14526B with MC14569B
fin
CF
C
MC14569B
ZERO DETECT
CF
C
MC14522B
OR
MC14526B
Q4
PE
“0”
CF
C
MC14522B
OR
MC14526B
Q4
PE
“0”
Q1/C2
PE
“0”
MC14568B
LSD
MSD
fout
DP0 – – – – – – DP3
DP0 – – – – – – DP3
DP0 – – – – – – DP3
Figure 7. Frequency Synthesizer with MC14568B and MC14569B Using a Mixer
(Channel Spacing 10 kHz)
Frequencies shown in parenthesis are given as an example.
(40 kHz)
VSS
PE
DP0 – – – – DP3
PCin
C1
CTI
“0”
PCout
G
F
Q1/C2
VSS
VSS
VCO
fout
(144 – 146 MHz)
VDD
MC14011
CF
Q
ZERO DETECT
C
CRYSTAL
OSCILLATOR
2 k
2M
MC14568B
MC14569B
MIXER
(143.5 MHz)
Содержание CMOS Logic
Страница 1: ......
Страница 5: ...iv MOTOROLA CMOS LOGIC DATA ...
Страница 6: ...Master Index 1 ...
Страница 12: ...Product Selection Guide 2 ...
Страница 17: ...The Better Program 3 ...
Страница 20: ...B and UB Series Family Data 4 ...
Страница 25: ...CMOS Handling and Design Guidelines 5 ...
Страница 32: ...CMOS Handling and Design Guidelines 5 ...
Страница 39: ...Data Sheets 6 ...
Страница 69: ...MOTOROLA CMOS LOGIC DATA 6 31 MC14008B Figure 5 Logic Diagram Cin A1 B1 A2 B2 A3 B3 A4 B4 S1 S2 S3 S4 Cout ...
Страница 234: ...MOTOROLA CMOS LOGIC DATA MC14174B 6 196 FUNCTIONAL BLOCK DIAGRAM TIMING DIAGRAM ...
Страница 238: ...MOTOROLA CMOS LOGIC DATA MC14175B 6 200 FUNCTIONAL BLOCK DIAGRAM TIMING DIAGRAM ...
Страница 555: ...CMOS Reliability 7 ...
Страница 561: ...Equivalent Gate Count 8 ...
Страница 563: ...Packaging Information Including Surface Mounts 9 ...
Страница 571: ......