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74LVC16646ADGGRE4 bảng dữ liệu(PDF) 2 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  16-BIT BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
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74LVC16646ADGGRE4 bảng dữ liệu(HTML) 2 Page - Texas Instruments

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
SN74LVC16646A
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
SCES408B – AUGUST 2002 – REVISED APRIL 2005
Data on the A or B bus is clocked into the registers on the low-to-high transition of the appropriate clock (CLKAB
or CLKBA) input. Figure 1 illustrates the four fundamental bus-management functions that can be performed with
the SN74LVC16646A.
Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver mode,
data present at the high-impedance port can be stored in either register or in both. The select-control (SAB and
SBA) inputs can multiplex stored and real-time (transparent mode) data. The circuitry used for select control
eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and
real-time data. DIR determines which bus receives data when OE is low. In the isolation mode (OE high), A data
can be stored in one register and/or B data can be stored in the other register.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
When an output function is disabled, the input function still is enabled and can be used to store and transmit
data. Only one of the two buses, A or B, can be driven at a time.
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.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
FUNCTION TABLE
INPUTS
DATA I/O(1)
OPERATION OR FUNCTION
OE
DIR
CLKAB
CLKBA
SAB
SBA
A1-A8
B1-B8
X
X
X
X
X
Input
Unspecified
Store A, B unspecified(1)
X
X
X
X
X
Unspecified
Input
Store B, A unspecified(1)
H
X
X
X
Input
Input
Store A and B data
H
X
H or L
H or L
X
X
Input
Input
Isolation, hold storage
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
L
H
X
X
L
X
Input
Output
Real-time A data to B Bus
L
H
H or L
X
H
X
Input
Output
Stored A data to bus
(1)
The data-output functions can be enabled or disabled by various signals at OE or DIR. 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.
2


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