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SN74ALS992NT Datasheet(PDF) 1 Page - Texas Instruments

Part No. SN74ALS992NT
Description  9-BIT D-TYPE TRANSPARENT READ-BACK LATCH WITH 3-STATE OUTPUTS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN74ALS992
9-BIT D-TYPE TRANSPARENT READ-BACK LATCH
WITH 3-STATE OUTPUTS
SDAS028B – 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
Designed With Nine Bits for Parity
Applications
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (NT) 300-mil DIPs
description
This 9-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. In addition, this device provides
a 3-state buffer-type output and is easily
implemented in parity applications.
The nine latches are transparent D-type latches. While the latch-enable (LE) input is high, the Q outputs follow
the data (D) inputs. The Q outputs are in the 3-state condition when the output-enable (OEQ) input is high.
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 SN74ALS992 is characterized for operation from 0
°C to 70°C.
logic symbol
C1
13
LE
2D
3
3D
4
4D
5
5D
6
6D
7
7D
8
8D
9
2
5Q
19
6Q
18
7Q
17
8Q
16
2Q
22
3Q
21
4Q
20
1Q
23
1D
2
1D
R
11
CLR
EN2
1
OERB
EN3
14
OEQ
3
9D
10
9Q
15
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
DW OR NT PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
OERB
1D
2D
3D
4D
5D
6D
7D
8D
9D
CLR
GND
VCC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
9Q
OEQ
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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