Programming instructions

74xx
 National Instruments Corporation 6-25 Multisim Component Reference Guide
Sample 4-bit bin counter truth table:
6.4.49 74xx162 (Sync 4-bit Decade Counter)
This synchronous, presettable decade counter features an internal carry look-ahead for fast
counting.
INPUTS OUTPUTS
OPERATING
MODE
MR
CP CEP CET PE DN QN TC
0XXXXX00Reset (clear)
1·XXll00
Parallel load
1· XXl h1(1)
1· hhhXcoun
t
(1) Count
1Xl XhXq
n
(1) Hold (do
nothing)
1XXl h Xq
n
0
1 = High voltage level
h = High voltage level one setup prior to the low-to-high clock transition
0 = Low voltage level
l = Low voltage level one setup prior to the low-to-high clock transition
q
n
= Lower case letters indicate the state of the referenced output prior to the
low-to-high clock transition
X = Don’t care
· = Low-to-high clock transition
(1) = The TC output is High when CET is High and the counter is at Terminal
Count (HHHH)
ComponentRef.book Page 25 Thursday, December 7, 2006 10:12 AM