74AC240_01 Datasheet, PDF (2/9 Pages) STMicroelectronics – OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (INVERTED)

74AC240
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 4, 6, 8
9, 7, 5, 3
11, 13, 15,
17
18, 16, 14,
12
19
10
20
SYMBOL NAME AND FUNCTION
1G
1A1 to 1A4
2Y1 to 2Y4
2A1 to 2A4
Output Enable Input
Data Inputs
Data Outputs
Data Inputs
1Y1 to 1Y4 Data Outputs
2G
GND
V_CC
Output Enable Input
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
G
L
L
H
X : Don’t Care
Z : High Impedance
INPUTS
An
L
H
X
OUTPUT
Yn
H
L
Z
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V_CC Supply Voltage
-0.5 to +7
V
V_I
DC Input Voltage
-0.5 to V_CC + 0.5
V
V_O
DC Output Voltage
-0.5 to V_CC + 0.5
V
I_IK
DC Input Diode Current
± 20
mA
I_OK
DC Output Diode Current
± 20
mA
I_O
DC Output Current
± 50
mA
I_CC or I_GND DC V_CC or Ground Current
± 400
mA
T_stg Storage Temperature
-65 to +150
°C
T_L
Lead Temperature (10 sec)
300
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occour. Functional operation under these conditions
is not implied.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
V_CC Supply Voltage
V_I
Input Voltage
V_O
Output Voltage
T_op
Operating Temperature
dt/dv Input Rise and Fall Time V_CC = 3.0, 4.5 or 5.5V (note 1)
1) V_IN from 30% to 70% of V_CC
Value
2 to 6
0 to V_CC
0 to V_CC
-55 to 125
8
Unit
V
V
V
°C
ns/V
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