NXP Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
6. Functional description
Table 3.
Input
nOE
L
L
H
[1]
Function table
Output
nAn
L
H
X
nYn
L
H
Z
H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
7. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
V
CC
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
Parameter
supply voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
DIP20 package
SO20, SSOP20, TSSOP20 and
DHVQFN20 packages
[1]
[2]
For DIP20 package: P
tot
derates linearly with 12 mW/K above 70
C.
For SO20 packages: P
tot
derates linearly with 8 mW/K above 70
C.
For SSOP20 and TSSOP20 packages: P
tot
derates linearly with 5.5 mW/K above 60
C.
For DHVQFN20 packages: above 60
C,
P
tot
derates linearly with 4.5 mW/K.
Conditions
V
I
<
0.5
V or V
I
> V
CC
+ 0.5 V
V
O
<
0.5
V or V
O
> V
CC
+ 0.5 V
0.5
V < V
O
< V
CC
+ 0.5 V
Min
0.5
-
-
-
-
70
65
-
-
Max
+7
20
20
35
70
-
+150
750
500
Unit
V
mA
mA
mA
mA
mA
C
mW
mW
8. Recommended operating conditions
Table 5.
Symbol
74HC244
V
CC
V
I
V
O
t/V
supply voltage
input voltage
output voltage
input transition rise and fall rate V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
T
amb
ambient temperature
2.0
0
0
-
-
-
40
5.0
-
-
-
1.67
-
-
6.0
V
CC
V
CC
625
139
83
+125
V
V
V
ns/V
ns/V
ns/V
C
Recommended operating conditions
Parameter
Conditions
Min
Typ
Max
Unit
74HC_HCT244
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 4 — 24 September 2012
4 of 18
PHILIPS [ NXP SEMICONDUCTORS ]
