Philips Semiconductors
Product specification
8-bit synchronous binary down counter
74HC/HCT40103
Fig.4 Functional diagram.
FUNCTION TABLE
CONTROL INPUTS
PRESET MODE
MR
H
H
H
H
L
Note
1. Clock connected to CP.
Synchronous operation: changes occur on the LOW-to-HIGH CP transition.
Jam inputs: MSD = P
7
, LSD = P
0
.
H = HIGH voltage level
L = LOW voltage level
X = don’t care
APPLICATIONS
•
Divide-by-n counters
•
Programmable timers
•
Interrupt timers
•
Cycle/program counters
PL
H
H
H
L
X
PE
H
H
L
X
X
TE
H
L
X
X
X
asynchronous
synchronous
inhibit counter
count down
preset on next LOW-to HIGH clock transition
preset asynchronously
clear to maximum count
ACTION
1998 Jul 08
4
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
