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SN54LVT16646 Datasheet(PDF) 2 Page - Texas Instruments

Part No. SN54LVT16646
Description  3.3-V ABT 16-BIT BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN54LVT16646 Datasheet(HTML) 2 Page - Texas Instruments

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SN54LVT16646, SN74LVT16646
3.3-V ABT 16-BIT BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS149C – JULY 1994 – REVISED JULY 1995
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
When an output function is disabled, the input function is still enabled and may be used to store and transmit
data. Only one of the two buses, A or B, may be driven at a time.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
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.
The SN74LVT16646 is available in TI’s shrink small-outline (DL) and thin shrink small-outline (DGG) packages,
which provide twice the I/O pin count and functionality of standard small-outline packages in the same
printed-circuit-board area.
The SN54LVT16646 is characterized for operation over the full military temperature range of – 55
°C to 125°C.
The SN74LVT16646 is characterized for operation from – 40
°C to 85°C.
FUNCTION TABLE
INPUTS
DATA I/Os
OPERATION OR FUNCTION
OE
DIR
CLKAB
CLKBA
SAB
SBA
A1 THRU A8
B1 THRU B8
OPERATION OR FUNCTION
X
X
X
X
X
Input
Unspecified†
Store A, B unspecified†
X
XX
X
X
Unspecified†
Input
Store B, A unspecified†
H
X
X
X
Input
Input
Store A and B data
H
X
H or L
H or L
X
X
Input disabled
Input disabled
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 B bus
† The data output functions may be enabled or disabled by various signals at OE and DIR. Data input functions are always enabled; i.e., data at
the bus pins will be stored on every low-to-high transition of the clock inputs.


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