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 4 of 17
NXP Semiconductors
74HC244-Q100; 74HCT244-Q100
Octal buffer/line driver; 3-state
5.2 Pin description
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 SO20 packages: above 70 C, P
tot
derates linearly with 8 mW/K.
For TSSOP20 package: above 60 C, P
tot
derates linearly with 5.5 mW/K.
For DHVQFN20 packages: above 60 C, P
tot
derates linearly with 4.5 mW/K.
Table 2. Pin description
Symbol Pin Description
1OE
, 2OE 1, 19 output enable input (active LOW)
1A0, 1A1, 1A2, 1A3 2, 4, 6, 8 data input
2Y0, 2Y1, 2Y2, 2Y3 3, 5, 7, 9 bus output
GND 10 ground (0 V)
2A0, 2A1, 2A2, 2A3 17, 15, 13, 11 data input
1Y0, 1Y1, 1Y2, 1Y3 18, 16, 14, 12 bus output
V
CC
20 supply voltage
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
[1]
- 500 mW
