Programming instructions

TTL
Multisim Component Reference Guide 6-56 ni.com
Decade counter truth table:
6.4.97 74xx293 (4-bit Binary Counter)
This device contains four master-slave flip-flops and additional gating to provide a divide-by-
two counter and a three-stage binary counter for which the count cycle length is divide-by-
eight.
Counter truth table:
6.4.98 74xx298 (Quad 2-In MUX)
This quadruple two-input multiplexer selects one of two 4-bit data sources and stores data
synchronously with system clock.
COUNT QD QC QB QA R0(1) R0(2) R9(1) R9(2) QD QC QB QA
0 00001 1 0 X 0000
1 00011 1 X 0 0000
2 0010X X 1 1 1001
3 0011X 0 X 0 COUNT
4 01000 X 0 X COUNT
5 01010 X X 0 COUNT
6 0110X 0 0 X COUNT
7 0111
8 1000
9 1001
RESET IN OUTPUT
Ro1
Ro2 Qd Qc Qb Qa
110000
0 X COUNT
X 0 COUNT
ComponentRef.book Page 56 Thursday, December 7, 2006 10:12 AM