74ALS244 데이터 시트보기 (PDF) - Philips Electronics
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74ALS244 Datasheet PDF : 9 Pages
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Philips Semiconductors
Octal buffer (3-State)
Product specification
74ALS244A/74ALS244A-1
LOGIC DIAGRAM
Ia0 2
Ia1 4
Ia2 6
Ia3 8
OEa 1
VCC = Pin 20
GND = Pin 10
18 Ya0
Ib0 17
16 Ya1
Ib1 15
14 Ya2
Ib2 13
12 Ya3
Ib3 11
OEb 19
3 Yb0
5 Yb1
7 Yb2
9 Yb3
FUNCTION TABLE
INPUTS
OEa
Ia
OEb
Ib
L
L
L
L
L
H
L
H
H
X
H
X
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
OUTPUTS
Ya
Yb
L
L
H
H
Z
Z
SF00230
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free air temperature range.)
SYMBOL
PARAMETER
VCC
VIN
IIN
VOUT
IOUT
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
Current applied to output in Low output state
All versions
-1 version
Tamb
Tstg
Operating free-air temperature range
Storage temperature range
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to VCC
48
96
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
mA
°C
°C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
VCC
Supply voltage
VIH
High-level input voltage
VIL
Low-level input voltage
IIK
Input clamp current
IOH
High-level output current
IOL
Low-level output current
Tamb
Operating free-air temperature range
NOTES:
1. The 48mA limit applies only under the condition of VCC = 5.0V ± 5%.
All versions
-1 versions
LIMITS
MIN NOM MAX
4.5
5.0
5.5
2.0
0.8
–18
–15
24
481
0
+70
UNIT
V
V
V
mA
mA
mA
mA
°C
1991 Feb 08
3
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