74VHC244T Просмотр технического описания (PDF) - STMicroelectronics
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74VHC244T Datasheet PDF : 8 Pages
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74VHC244
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCT ION
1
1G
Output Enable Input
2, 4,6, 8 1A1 to 1A4 Data Inputs
9, 7,5, 3 2Y1 to 2Y4 Data Outputs
11, 13, 15, 17 2A1 to 2A4 Data Inputs
18, 16, 14, 12 1Y1 to 1Y4 Data Outputs
19
2G
Output Enable Input
10
GND Ground (0V)
20
VCC
Positive Supply Voltage
TRUTH TABLE
G
L
L
H
X:”H” or ”L”
Z: High impedance
INPUT
An
L
H
X
OUTPUT
Yn
L
H
Z
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC Supply Voltage
-0.5 to +7.0
V
VI
DC Input Voltage
-0.5 to +7.0
V
VO DC Output Voltage
-0.5 to VCC + 0.5
V
IIK
DC Input Diode Current
- 20
mA
IOK DC Output Diode Current
± 20
mA
IO
DC Output Current
± 25
mA
ICC orIGND DC VCC or Ground Current
± 75
mA
Tstg Storage Temperature
-65 to +150
oC
TL
Lead Temperature (10 sec)
300
oC
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC Supply Voltage
VI
Input Voltage
VO
Output Voltage
Top Operating Temperature
dt/dv Input Rise and Fall Time (see note 1) (VCC = 3.3 ± 0.3V)
(V CC = 5.0 ± 0.5V)
1) VIN from 30% to70%of VCC
Valu e
2.0 to 5.5
0 to 5.5
0 to VCC
-40 to +85
0 to 100
0 to 20
Unit
V
V
V
oC
ns/V
ns/V
2/8
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