Programming instructions

TTL
Multisim Component Reference Guide 6-24 ni.com
6.4.47 74xx160 (Sync 4-bit Decade Counter (clr))
This synchronous, presettable decade counter features an internal carry look-ahead for fast
counting.
Sample decade counter truth table:
6.4.48 74xx161 (Sync 4-bit Bin Counter)
This synchronous, presettable binary counter features an internal carry look-ahead for fast
counting.
INPUTS OUTPUTS
OPERATING MODE
MR
CP CEP CET PE DN QN TC
0XXXXX0 0Reset (clear)
1·XXll0 0
Parallel load
1· XXl h1 (1)
1· hhhXcount (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 (HLLH)
ComponentRef.book Page 24 Thursday, December 7, 2006 10:12 AM