Programming instructions

TTL
Multisim Component Reference Guide 6-34 ni.com
6.4.62 74xx190 (Sync BCD up/down Counter)
This device is a synchronous, BCD, reversible up/down counter.
Counter TC and RC
truth table:
INPUTS
TERMINAL COUNT
STATE
OUTPUTS
U
/D CE CP Q0 Q1 Q2 Q3 TC RC
11X1XX101
01X1XX111
00 1XX11
01X000001
11X000011
10 00001
1 = High voltage level
0 = Low voltage level
X = Don’t care
= Low pulse
ComponentRef.book Page 34 Thursday, December 7, 2006 10:12 AM