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PROGRAMMABLE
CARRY IN OR
UP/DOWN
CLOCK
PRESET ENABLE
Q1 OR CARRY OUT
RESET
MOTOROLA CMOS LOGIC DATA
500 pF
PE
CARRY IN
R
UP/DOWN
PULSE
CLOCK
GENERATOR
P1
P2
P3
CARRY
P4
20 ns
50%
CLOCK
VARIABLE
WIDTH
Figure 1. Power Dissipation Test Circuit and Waveform
PULSE
GENERATOR
t su
50%
50%
t w(H)
t w(H)
CARRY OUT ONLY
90%
10%
t THL
t PLH
t w(H)
Figure 2. Switching Time Test Circuit and Waveforms
V DD
0.01 µF
I D
CERAMIC
Q1
Q2
Q3
C L
C L
Q4
C L
C L
OUT
C L
20 ns
V DD
90%
10%
V SS
V DD
PE
Q1
CARRY IN
R
Q2
UP/DOWN
CLOCK
Q3
P1
P2
Q4
P3
CARRY
P4
C L
OUT
C L
V SS
t rem
1
fcl
20 ns
t TLH
90%
10%
t PHL
t PLH
t rem
C L
C L
C L
V DD
V SS
V DD
V SS
V DD
V SS
V OH
V OL
V DD
V SS
MC14510B
6–251
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