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SN74ALS996DW Datasheet(PDF) 1 Page - Texas Instruments

Part No. SN74ALS996DW
Description  8-BIT D-TYPE EDGE-TRIGGERED READ-BACK LATCHES
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN54ALS996 . . . JT PACKAGE
SN74ALS996 . . . DW OR NT PACKAGE
(TOP VIEW)
SN54ALS996 . . . FK PACKAGE
(TOP VIEW)
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24
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1D
2D
3D
4D
5D
6D
7D
8D
EN
RD
CLK
GND
VCC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
OE
T/C
CLR
NC – No internal connection
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12 13
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3Q
4Q
5Q
NC
6Q
7Q
8Q
4D
5D
6D
NC
7D
8D
EN
426
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SN54ALS996, SN74ALS996
8-BIT D-TYPE EDGE-TRIGGERED READ-BACK LATCHES
SDAS098B – OCTOBER 1984 – REVISED JANUARY 1995
Copyright
© 1995, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
3-State I/O-Type Read-Back Inputs
Bus-Structured Pinout
T/C Determines True or Complementary
Data at Q Outputs
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic
(NT) and Ceramic (JT) 300-mil DIPs
description
These 8-bit latches are 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 Q outputs are
designed with bus-driving capability.
The edge-triggered flip-flops enter the data on the
low-to-high transition of the clock (CLK) input
when the enable (EN) input is low. Data can be
read back onto the data inputs by taking the read
(RD) input low, in addition to having EN low. When
EN is high, both the read-back and write modes
are disabled. Transitions on EN should only be
made with CLK high to prevent false clocking.
The polarity of the Q outputs can be controlled by
the polarity (T/C) input. When T/C is high, Q is the
same as is stored in the flip-flops. When T/C is low,
the output data is inverted. The Q outputs can be
placed in the high-impedance state by taking the
output-enable (OE) input high. OE does not affect
the internal operation of the register. Old data can
be retained or new data can be entered while the
outputs are off.
A low level at the clear (CLR) input resets the
internal registers low. The clear function is
asynchronous and overrides all other register
functions.
The -1 version of the SN74ALS996 is identical to the standard version, except that the recommended maximum
IOL for the -1 version is increased to 48 mA. There is no -1 version of the SN54ALS996.
The SN54ALS996 is characterized for operation over the full military temperature range of – 55
°C to 125°C. The
SN74ALS996 is characterized for operation from 0
°C to 70°C.
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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