參數(shù)資料
型號(hào)： 744ALS244A-1D
廠商： NXP Semiconductors N.V.
英文描述： CRYSTAL 9.8304MHZ SERIES SMD
中文描述： 八路緩沖三態(tài)
文件頁(yè)數(shù)： 2/9頁(yè)
文件大?。?/td> 110K
代理商： 744ALS244A-1D
Philips Semiconductors
Product specification
74ALS244A/74ALS244A-1
Octal buffer (3-State)
2
1991 Feb 08
853–1277 01670
FEATURES
Octal bus interface
3-State buffer outputs sink 24mA and source 15mA
The -1 version sinks 48mA
DESCRIPTION
The 74ALS244A is an octal buffer that is ideal for driving bus lines or
buffer memory address registers. The outputs are all capable of
sinking 24mA and sourcing up to 15mA, producing very good
capacitive drive characteristics. The device features two output
enables, OEa and OEb, each controlling four of the 3-State outputs.
The 74ALS244A-1 sinks 48 mA I
OL
if the V
CC
is limited to
5.0V
±
0.25V.
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS244A
4.5ns
17mA
74ALS244A-1
4.5ns
17mA
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 V
CC
OEa
Ia0
Yb0
Ia1
Yb1
Ia2
Yb2
Ia3
Yb3
GND
SF00227
OEb
Ya0
Ib0
Ya1
Ib1
Ya2
Ib2
Ya3
Ib3
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±
10%,
T
amb
= 0
°
C to +70
°
C
DRAWING
NUMBER
20-pin plastic DIP
74ALS244AN,
74ALS244A-1N
SOT146-1
20-pin plastic SOL
74ALS244AD,
744ALS244A-1D
SOT163-1
20-pin plastic
SSOP Type II
74ALS244ADB,
74ALS244A-1DB
SOT339-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
Ian, Ibn
Data inputs
1.0/1.0
20
μ
A/0.1mA
OEa, OEb
Output Enable inputs (active-Low)
1.0/1.0
20
μ
A/0.1mA
Yan, Ybn
Data outputs
750/240
15mA/24mA
Yan, Ybn
One (1.0) ALS unit load is defined as: 20
μ
A in the High state and 0.1mA in the Low state.
Data outputs (-1 version)
750/480
15mA/48mA
NOTE:
LOGIC SYMBOL
OEa
OEb
1
SF00228
2
4
6
8
17
15
13
11
18
16
14
12
3
5
7
9
Ia0
Ia1
Ia2
Ia3
Ib0
Ib1
Ib2
Ib3
Ya0
Ya1 Ya2
Ya3 Yb0 Yb1 Yb2 Yb3
V
= Pin 20
GND = Pin 10
19
IEC/IEEE SYMBOL
1
2D
EN1
EN2
1
2
19
2
4
6
8
17
15
13
11
18
16
14
12
3
5
7
9
SF00229
相關(guān)PDF資料
PDF描述
74ALS244A-1DB Octal buffer 3-State
74ALS244A-1N CRYSTAL 9.84375 MHZ PF SMD
74ALS244A Octal buffer (3-State)(八通道緩沖器（三態(tài)）)
74ALS244 Octal buffer 3-State
74ALS244AD Octal buffer 3-State
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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