NXP Semiconductors
74HC244-Q100; 74HCT244-Q100
Octal buffer/line driver; 3-state
Table 7.
Dynamic characteristics
…continued
GND = 0 V; for load circuit see
Figure 8.
Symbol Parameter
Conditions
Min
74HCT244-Q100
t
pd
propagation delay nAn to nYn;
see
V
CC
= 4.5 V
V
CC
= 5.0 V; C
L
= 15 pF
t
en
t
dis
t
t
C
PD
enable time
disable time
transition time
power dissipation
capacitance
nOE to nYn; V
CC
= 4.5 V; see
nOE to nYn; V
CC
= 4.5 V; see
V
CC
= 4.5 V; see
per buffer;
V
I
= GND to V
CC
1.5 V
25
C
Typ
Max
40 C
to +125
C
Unit
Max
(85
C)
Max
(125
C)
-
-
-
-
-
-
13
11
15
15
5
35
22
-
30
25
12
-
28
-
38
31
15
-
33
-
45
38
18
-
ns
ns
ns
ns
ns
pF
[1]
[2]
[3]
[4]
[5]
t
pd
is the same as t
PHL
and t
PLH
.
t
en
is the same as t
PZH
and t
PZL
.
t
dis
is the same as t
PHZ
and t
PLZ
.
t
t
is the same as t
THL
and t
TLH
.
C
PD
is used to determine the dynamic power dissipation (P
D
in
W):
P
D
= C
PD
V
CC2
f
i
N +
(C
L
V
CC2
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in V;
N = number of inputs switching;
(C
L
V
CC2
f
o
) = sum of outputs.
11. Waveforms
V
I
nAn input
GND
t
PHL
V
OH
nYn output
V
OL
t
THL
90 %
V
M
10 %
t
TLH
001aae013
V
M
V
M
t
PLH
V
M
Measurement points are given in
V
OL
and V
OH
are typical voltage output levels that occur with the output load.
Fig 6.
Input (nAn) to output (nYn) propagation delays and output transition times
74HC_HCT244_Q100
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 1. — 7 August 2012
8 of 17
PHILIPS [ NXP SEMICONDUCTORS ]
