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IN74ACT251D 参数 Datasheet PDF下载

IN74ACT251D图片预览
型号: IN74ACT251D
PDF下载: 下载PDF文件 查看货源
内容描述: 8输入数据选择器/多路复用器与三态输出 [8-INPUT DATA SELECTOR/MULTIPLEXER WITH 3-STATE OUTPUTS]
分类和应用: 解复用器输出元件输入元件
文件页数/大小: 5 页 / 194 K
品牌: INTEGRAL [ INTEGRAL CORP. ]
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IN74ACT251
8-I
NPUT
D
ATA
S
ELECTOR
/M
ULTIPLEXER
WITH
3-S
TATE
O
UTPUTS
High-Speed Silicon-Gate CMOS
The IN74ACT251 is identical in pinout to the LS/ALS251,
HC/HCT251. The IN74ACT251 may be used as a level converter
for interfacing TTL or NMOS outputs to High Speed CMOS inputs.
The device selects one of the eight binary Data Inputs, as
determined by the Address Inputs. The Output Enable pin must be
at a low level for the selected data to appear at the outputs. If
Output Enable is high, the Y and the Y outputs are in the high-
impedance state. This 3-State feature allows the IN74ACT251 to
be used in bus-oriented systems.
TTL/NMOS Compatible Input Levels
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 4.5 to 5.5 V
Low Input Current: 1.0
µA;
0.1
µA
@ 25°C
Outputs Source/Sink 24 mA
ORDERING INFORMATION
IN74ACT251N Plastic
IN74ACT251D SOIC
T
A
= -40° to 85° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
A2
X
L
L
L
L
H
H
Inputs
A1 A0 Output
Enable
X
X
H
L
L
L
L
H
H
L
L
H
H
H
L
H
L
H
L
H
L
L
L
L
L
L
L
Outputs
Y
Y
Z
D0
D1
D2
D3
D4
D5
D6
D7
Z
PIN 16 =V
CC
PIN 8 = GND
H
H
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D0,D1...D7=the level of the
respective D input
Z = high-impedance state
X = don’t care
1