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HD74HC192 Datasheet, PDF (4/14 Pages) Hitachi Semiconductor – Synchronous Up/Down Decade,4-bit Binary Counter(Dual Clock Line)
HD74HC192, HD74HC193
Timing Chart
HD74HC193
Illustrated below is the following sequence:
1. Clear outputs to zero.
2. Load (preset) to binary thirteen.
3. Count up to fourteen, fifteen, zero, one and two.
4. Count down to one, zero, borrow, fifteen and thirteen.
Clear
Load
A
B
Data
Inputs C
D
Count Up
Count Down
QA
QB
Outputs
QC
QD
Carry
Borrow
0
13
Clear Preset
14 15 0 1 2
Count Up
1 0 15 14 13
Count Down
Rev.3.00, Jan 31, 2006 page 4 of 13