74AHC_AHCT240 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 4 — 25 September 2013 3 of 16
NXP Semiconductors 74AHC240; 74AHCT240
Octal buffer/line driver; inverting; 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] The minimum input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] For SO20 package: above 70 C the value of P
tot
derates linearly with 8.0 mW/K.
For TSSOP20 package: above 60 C the value of P
tot
derates linearly with 5.5 mW/K.
For DHVQFN20 package: above 60 C the value of P
tot
derates linearly with 4.5 mW/K.
Table 2. Pin description
Symbol Pin Description
1OE
1 output enable input (active LOW)
2OE
19 output enable input (active LOW)
1A0, 1A1, 1A2, 1A3 2, 4, 6, 8 data input
2A0, 2A1, 2A2, 2A3 17, 15, 13, 11 data input
1Y0, 1Y1, 1Y2, 1Y3 18, 16, 14, 12 data output
2Y0, 2Y1, 2Y2, 2Y3 3, 5, 7, 9 data output
GND 10 ground (0 V)
V
CC
20 power supply
Table 3. Function table
[1]
Control 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 +7.0 V
V
I
input voltage 0.5 +7.0 V
I
IK
input clamping current V
I
< 0.5 V
[1]
20 - mA
I
OK
output clamping current V
O
< 0.5 V or V
O
>V
CC
+0.5V
[1]
- 20 mA
I
O
output current V
O
= 0.5 V to (V
CC
+0.5V) - 25 mA
I
CC
supply current - 75 mA
I
GND
ground current 75 - mA
T
stg
storage temperature 65 +150 C
P
tot
total power dissipation T
amb
= 40 C to +125 C
[2]
- 500 mW
