Datasheet

74HC_HCT240_3 © NXP B.V. 2007. All rights reserved.
Product data sheet Rev. 03 — 2 August 2007 4 of 18
NXP Semiconductors
74HC240; 74HCT240
Octal buffer/line driver; 3-state; inverting
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 packages: above 70 °C, P
tot
derates linearly with 12 mW/K.
For SO20 packages: above 70 °C, P
tot
derates linearly with 8 mW/K.
For SSOP20 and TSSOP20 packages: 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.
2A0 17 data input
1Y0 18 bus output
2
OE 19 output enable input (active LOW)
V
CC
20 supply voltage
Table 2. Pin description
…continued
Symbol Pin Description
Table 3. Function table
[1]
Input Output
nOE nAn nYn
LLH
LHL
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
+ 0.5 V - ±20 mA
I
O
output current −0.5 V < V
O
< V
CC
+ 0.5 V - ±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]
DIP20 package - 750 mW
SO20, SSOP20, TSSOP20
and DHVQFN20 packages
- 500 mW