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74ACT16651 Scheda tecnica(PDF) 2 Page - Texas Instruments

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Il numero della parte 74ACT16651
Spiegazioni elettronici  16-BIT TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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74ACT16651 Scheda tecnica(HTML) 2 Page - Texas Instruments

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SN54ACT16651, 74ACT16651
16-BIT TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS449A – FEBRUARY 1993 – REVISED APRIL 1996
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
Data on the A or B bus, or both, can be stored in the internal D flip-flops by low-to-high transitions at the
appropriate clock (CLKAB or CLKBA) inputs regardless of the levels on the select-control or output-enable
inputs. When SAB and SBA are in the real-time transfer mode, it is also possible to store data without using the
internal D-type flip-flops by simultaneously enabling OEAB and OEBA. In this configuration, each output
reinforces its input. Thus, when all other data sources to the two sets of bus lines are at high impedance, each
set of bus lines remains at its last state.
The 74ACT16651 is packaged in TI’s shrink small-outline package, which provides twice the I/O pin count and
functionality of standard small-outline packages in the same printed-circuit-board area.
The SN54ACT16651 is characterized for operation over the full military temperature range of –55
°C to 125°C.
The 74ACT16651 is characterized for operation from –40
°C to 85°C.
FUNCTION TABLE
INPUTS
DATA I/O†
OPERATION OR FUNCTION
OEAB
OEBA
CLKAB
CLKBA
SAB
SBA
A1–A8
B1–B8
OPERATION OR FUNCTION
L
H
L
L
X
X
Input
Input
Isolation
L
H
↑↑
X
X
Input
Input
Store A and B data
X
H
L
X
X
Input
Unspecified‡
Store A, hold B
H
H
↑↑
X‡
X
Input
Output
Store A in both registers
L
X
L
X
X
Unspecified‡
Input
Hold A, store B
L
L
↑↑
XX‡
Output
Input
Store B in both registers
L
L
X
X
X
L
Output
Input
Real-time B data to A bus
L
L
X
L
X
H
Output
Input
Stored B data to A bus
H
H
X
X
L
X
Input
Output
Real-time A data to B bus
H
H
L
X
H
X
Input
Output
Stored A data to B bus
H
L
L
L
H
H
Output
Output
Stored A data to B bus and
stored B data to A bus
† The data-output functions may be enabled or disabled by a variety of level combinations at OEAB or OEBA. Data-input functions are always
enabled; i.e., data at the bus terminals is stored on every low-to-high transition of the clock inputs.
‡ Select control = L; clocks can occur simultaneously.
Select control = H; clocks must be staggered to load both registers.


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