ITT - Index of

ITT54190, ITT54191, ITT74190, ITT74191
SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP
MODE CONTROL
recommended operating conditions
(,
ITT54190, ITT54191 ITT74190, ITT74191
Min Nom Max Min Nom Max
Unit
Supply voltage, Vee
4.5 5
5.5 4.75 5 5.25
V
Normalized fan-out from each output, N
High logic level
20 20
Low. logic level
10 10
Input clock frequency, fclock
0
20 0 20
MHr
Width of clock input pulse. tw(clock)
25
25
ns
Width of load input pulse, tw(load)
35
35
ns
Data setup time, t5etup (See Figures 1 and 2)
20
20
ns
Data hold time. t hold
0
0
ns
Operating free-air temperature. TA
-55 25
125 0 25 70
°c
ITT54191. ITT74191 BINARY COUNTERS
typical load. count. and. inhibit sequences
Illustrated below is the following sequ.ence:
1: Load (preset) to binary thirteen.
2. Count up to fourteen, fifteen (maximum). zero,
one, and two.
DATA
INPUTS
, ,
A -.ll-~-L: =
I ,
I
'r-
1, __
, ,
LOA0-U
CLOCK
I 1 __
cJ17L-_
, I
0-n-:'L-_
,
DOWN/UP IL._---'--'-________ --'I .
-, "
ENABLE IL-+---;"7' _______ -!
1:1--_-,
os: = W. L-__ ...J
00 __ - --I -I
"
"
"
, '
",I
3. Inhibit.
4. Count down to one, zero (minimum). fifteen,
fou rteen, and thirteen.
MAx/M'N=-=~LI --.!:..;.:_-IIlL___-..!.___-"----..!._-lIlL_____
,,
, '
--113 :: 14 15 2 2: 2 I 1 15 14
IPPLE CLOCK - --I 1 I U I: U
I II---COUNTUP----ti-· IN·HIBIT--I
~
LOAD
L
13
l--COUNTDOWN--­
3 -227