Philips Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
11. Dynamic characteristics
Table 9:
Dynamic characteristics 74HC244
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF unless otherwise specified; for test circuit see
Symbol Parameter
T
amb
= 25
°C
t
PHL
,
t
PLH
propagation delay nAn to nYn see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 5 V; C
L
= 15 pF
V
CC
= 6.0 V
t
PZH
,
t
PZL
3-state output enable time
nOE to nYn
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
t
PHZ
,
t
PLZ
3-state output disable time
nOE to nYn
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
t
THL
,
t
TLH
output transition time
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
C
PD
power dissipation
capacitance
V
I
= GND to V
CC
Conditions
Min
Typ
Max
Unit
-
-
-
-
-
-
-
-
-
-
-
-
-
-
30
11
9
9
36
13
10
39
14
11
14
5
4
35
110
22
-
19
150
30
26
150
30
26
60
12
10
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
T
amb
=
−40 °C
to +85
°C
t
PHL
,
t
PLH
propagation delay nAn to nYn see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
t
PZH
,
t
PZL
3-state output enable time
nOE to nYn
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
t
PHZ
,
t
PLZ
3-state output disable time
nOE to nYn
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
t
THL
,
t
TLH
output transition time
see
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
-
-
-
-
-
-
75
15
13
ns
ns
ns
-
-
-
-
-
-
190
38
33
ns
ns
ns
-
-
-
-
-
-
190
38
33
ns
ns
ns
-
-
-
-
-
-
145
28
24
ns
ns
ns
74HC_HCT244_3
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 22 December 2005
10 of 22
PHILIPS [ NXP SEMICONDUCTORS ]
