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SN74AS821ANT Datasheet(PDF) 1 Page - Texas Instruments

No. de pieza SN74AS821ANT
Descripción Electrónicos  10-BIT BUS-INTERFACE FLIP-FLOPS WITH 3-STATE OUTPUTS
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

SN74AS821ANT Datasheet(HTML) 1 Page - Texas Instruments

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SN54AS821A . . . JT PACKAGE
SN74AS821A . . . DW OR NT PACKAGE
(TOP VIEW)
SN54AS821A . . . FK 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
OE
1D
2D
3D
4D
5D
6D
7D
8D
9D
10D
GND
VCC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
9Q
10Q
CLK
NC – No internal connection
32 1 28 27
12 13
5
6
7
8
9
10
11
25
24
23
22
21
20
19
3Q
4Q
5Q
NC
6Q
7Q
8Q
3D
4D
5D
NC
6D
7D
8D
426
14 15 16 17 18
SN54AS821A, SN74AS821A
10-BIT BUS-INTERFACE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS230A – DECEMBER 1983 – REVISED AUGUST 1995
Copyright
© 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Functionally Equivalent to AMD’s AM29821
Provide Extra Data Width Necessary for
Wider Address/Data Paths or Buses With
Parity
Outputs Have Undershoot-Protection
Circuitry
Power-Up High-Impedance State
Buffered Control Inputs to Reduce
dc Loading Effects
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic
(NT) and Ceramic (JT) 300-mil DIPs
description
These 10-bit flip-flops feature 3-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. They are
particularly suitable for implementing wider buffer
registers, I/O ports, bidirectional bus drivers with
parity, and working registers.
The ten flip-flops are edge-triggered D-type
flip-flops. On the positive transition of the clock
(CLK) input, the Q outputs are true to the data (D)
input.
A buffered output-enable (OE) input can be used
to place the ten outputs in either a normal logic
state (high or low logic levels) or a high-
impedance state. In the high-impedance state, the
outputs neither load nor drive the bus lines
significantly. The high-impedance state and
increased drive provide the capability to drive bus
lines without interface or pullup components.
OE does not affect the internal operation of the flip-flops. Previously stored data can be retained or new data
can be entered while the outputs are in the high-impedance state.
The SN54AS821A is characterized for operation over the full military temperature range of – 55
°C to 125°C. The
SN74AS821A is characterized for operation from 0
°C to 70°C.
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUT
OE
CLK
D
Q
L
H
H
L
LL
L
LX
Q0
H
X
X
Z
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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