Philips Semiconductors
8-bit synchronous binary down counter
Product specification
74HC/HCT40103
Fig.4 Functional diagram.
FUNCTION TABLE
CONTROL INPUTS
MR
PL
H
H
H
H
H
H
H
L
L
X
PE
TE
H
H
H
L
L
X
X
X
X
X
PRESET MODE ACTION
synchronous
asynchronous
inhibit counter
count down
preset on next LOW-to HIGH clock transition
preset asynchronously
clear to maximum count
Note
1. Clock connected to CP.
Synchronous operation: changes occur on the LOW-to-HIGH CP transition.
Jam inputs: MSD = P7, LSD = P0.
H = HIGH voltage level
L = LOW voltage level
X = don’t care
APPLICATIONS
• Divide-by-n counters
• Programmable timers
• Interrupt timers
• Cycle/program counters
1998 Jul 08
4