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SN74LVCH16652A Fiches technique(PDF) 2 Page - Texas Instruments

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No de pièce SN74LVCH16652A
Description  16-BIT BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
Download  12 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

SN74LVCH16652A Fiches technique(HTML) 2 Page - Texas Instruments

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SN74LVCH16652A
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
SCAS319G – NOVEMBER 1993 – REVISED JUNE 1998
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. 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 level configuration.
To ensure the high-impedance state during power up or power down, OEBA should be tied to VCC through a
pullup resistor and OEAB should be tied to GND through a pulldown resistor; the minimum value of the resistor
is determined by the current-sinking/current-sourcing capability of the driver.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators
in a mixed 3.3-V/5-V system environment.
Active bus-hold circuitry holds unused or floating data inputs at a valid logic level.
The SN74LVCH16652A 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
H or L
H or L
X
X
Input
Input
Isolation
L
H
↑↑
X
X
Input
Input
Store A and B data
X
H
H or L
X
X
Input
Unspecified‡
Store A, hold B
H
H
↑↑
X‡
X
Input
Output
Store A in both registers
L
X
H or 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
H or 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
H or L
X
H
X
Input
Output
Stored A data to B bus
H
L
H or L
H or 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 always are
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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