Datasheet

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