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SN74ALS990N3 Folha de dados(PDF) 1 Page - Texas Instruments

Nome de Peças SN74ALS990N3
Descrição Electrónicos  8-BIT D-TYPE TRANSPARENT READ-BACK LATCH
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SN74ALS990N3 Folha de dados(HTML) 1 Page - Texas Instruments

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SN74ALS990
8-BIT D-TYPE TRANSPARENT READ-BACK LATCH
SDAS027B – APRIL 1984 – REVISED JANUARY 1995
Copyright
© 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
3-State I/O-Type Read-Back Inputs
Bus-Structured Pinout
True Logic Outputs
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (N) 300-mil DIPs
description
This 8-bit latch is designed specifically for storing
the contents of the input data bus and providing
the capability of reading back the stored data onto
the input data bus.
The eight latches are transparent D-type latches.
While the latch-enable (LE) input is high, the
Q outputs follow the data (D) inputs.
Read back is provided through the output-enable (OERB) input. When OERB is taken low, the data present at
the output of the data latches is allowed to pass back onto the input data bus. When OERB is taken high, the
output of the data latches is isolated from the D inputs. OERB does not affect the internal operation of the latches;
however, precautions should be taken not to create a bus conflict.
The SN74ALS990 is characterized for operation from 0
°C to 70°C.
logic symbol
C1
11
LE
2D
3
3D
4
4D
5
5D
6
6D
7
7D
8
8D
9
5Q
15
6Q
14
7Q
13
8Q
12
2Q
18
3Q
17
4Q
16
1Q
19
1D
2
1D
EN2
1
OERB
2
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
DW OR N PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OERB
1D
2D
3D
4D
5D
6D
7D
8D
GND
VCC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
LE
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.


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