Philips Semiconductors
Product specification
Octal buffer/line driver; 3-state
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
I
CC
category: MSI
Note to HCT types
74HC/HCT244
The value of additional quiescent supply current (∆I
CC
) for a unit load of 1 is given in the family specifications.
To determine
∆I
CC
per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
1A
n
2A
n
1OE
2OE
UNIT LOAD COEFFICIENT
0.70
0.70
0.70
0.70
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
T
amb
(°C)
74HCT
SYMBOL
PARAMETER
+25
−40
to
+85
−40
to
+125
max.
33
ns
4.5
Fig.5
UNIT V
WAVEFORMS
CC
(V)
TEST CONDITIONS
min. typ. max. min. max. min.
t
PHL
/ t
PLH
propagation delay
1A
n
to 1Y
n;
2A
n
to 2Y
n
3-state output enable time
1OE to 1Y
n;
2OE to 2Y
n
3-state output disable time
1OE to 1Y
n;
2OE to 2Y
n
output transition time
13
22
28
t
PZH
/ t
PZL
15
30
38
45
ns
4.5
Fig.6
t
PHZ
/ t
PLZ
15
25
31
38
ns
4.5
Fig.6
t
THL
/ t
TLH
5
12
15
18
ns
4.5
Fig.5
December 1990
6
PHILIPS [ NXP SEMICONDUCTORS ]
