MC14553 Motorola, MC14553 Datasheet - Page 4

• Manufacturer Part Number: MC14553
• Description: 3-Digit BCD Counter
• Manufacturer: Motorola

GENERATOR
GENERATOR
GENERATOR
GENERATOR
MC14553B
4
DIGIT SELECT 1
DIGIT SELECT 2
DIGIT SELECT 3
PULSE
HUNDREDS Q0
HUNDREDS Q3
UNITS CLOCK
(a)
(b)
TENS CLOCK
OSCILLATOR
1
2
3
HUNDREDS
OVERFLOW
UNITS Q0
UNITS Q1
UNITS Q2
UNITS Q3
SCAN
TENS Q0
TENS Q3
DISABLE
MASTER
CLOCK
RESET
C
LE
DIS
MR
C
LE
MR
DIS
(DISABLES CLOCK WHEN HIGH)
16
8
UNITS
TENS
V DD
V SS
V DD
V SS
DS1
DS2
DS3
DS1
DS2
DS3
O.F.
O.F.
Q3
Q2
Q1
Q0
Q3
Q2
Q1
Q0
Figure 1. 3–Digit Counter Timing Diagram (Reference Figure 3)
HUNDREDS
Figure 2. Switching Time Test Circuits and Waveforms
C L
C L
C L
C L
C L
C L
C L
C L
UP AT 80
C L
C L
MASTER RESET
BCD OUT
LATCH
ENABLE
CLOCK
CLOCK
BCD OUT
OVERFLOW
20 ns
10%
90%
t PLH
50%
t TLH
t su
10%
10%
90%
50%
t TLH
20 ns
90%
50%
t PHL , t PLH
MOTOROLA CMOS LOGIC DATA
UP AT 800
50%
t rem
t PHL
t THL
UP AT 980
t WH(R)
50%
t PHL
50%
t su
1/f cl
t WL(cl)
t PHL
50%