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MC14553B Datasheet(PDF) 4 Page - ON Semiconductor

Part No. MC14553B
Description  3−Digit BCD Counter
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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MC14553B Datasheet(HTML) 4 Page - ON Semiconductor

   
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MC14553B
http://onsemi.com
4
Figure 2. 3−Digit Counter Timing Diagram (Reference Figure 4)
UNITS CLOCK
UNITS Q0
UNITS Q1
UNITS Q2
UNITS Q3
TENS CLOCK
TENS Q0
TENS Q3
HUNDREDS
CLOCK
HUNDREDS Q0
HUNDREDS Q3
DISABLE
OVERFLOW
MASTER
RESET
SCAN
OSCILLATOR
DIGIT SELECT 1
DIGIT SELECT 2
DIGIT SELECT 3
UP AT 80
UP AT 980
UP AT 800
(DISABLES CLOCK WHEN HIGH)
UNITS
TENS
HUNDREDS
PULSE
GENERATOR
(a)
16
VDD
Q3
Q2
Q1
Q0
O.F.
DS1
DS2
DS3
8VSS
C
LE
DIS
MR
CL
CL
CL
CL
CL
GENERATOR
1
(b)
VDD
Q3
Q2
Q1
Q0
O.F.
DS1
DS2
DS3
VSS
C
LE
MR
DIS
CL
CL
CL
CL
CL
GENERATOR
2
GENERATOR
3
20 ns
20 ns
90%
10%
tPLH
tPHL
50%
50%
tTHL
tTLH
10%
90%
50%
1/fcl
tWL(cl)
tTLH
50%
OVERFLOW
BCD OUT
CLOCK
90%
10%
trem
tPHL, tPLH
50%
50%
50%
tWH(R)
tsu
tPHL
MASTER RESET
BCD OUT
LATCH
ENABLE
CLOCK
Figure 3. Switching Time Test Circuits and Waveforms
tsu
tPHL


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