Datasheet

8
Test Circuits and Waveforms
FIGURE 1. ’HC192 SYNCHRONOUS DECADE COUNTERS, TYPICAL RESET, PRESET AND COUNT SEQUENCES
MASTER RESET
ASYNCHRONOUS PARALLEL LOAD
PRESET DATA
P0
P1
P2
P3
CLOCK UP
CLOCK DOWN
OUTPUTS
Q
0
Q
1
Q
2
Q
3
TERMINAL COUNT UP
TERMINAL COUNT DOWN
07
89012
COUNT DOWNCOUNT UPRESET
10987
PRESET
SEQUENCES:
1. RESET OUTPUTS TO ZERO.
2. LOAD (PRESET) TO BCD SEVEN.
TERMINAL COUNT UP, ZERO,
3. COUNT UP TO EIGHT, NINE,
ONE AND TWO.
4. COUNT DOWN TO ONE, ZERO,
TERMINAL COUNT DOWN, NINE,
EIGHT AND SEVEN.
CD54/74HC192, CD54/74HC193, CD54/74HCT193