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SN54LVTH16646 데이터시트(HTML) 2 Page - Texas Instruments

부품명 SN54LVTH16646
상세내용  3.3-V ABT 16-BIT BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
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SN54LVTH16646 데이터시트(HTML) 2 Page - Texas Instruments

 
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SN54LVTH16646, SN74LVTH16646
3.3-V ABT 16-BIT BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS698E – JULY 1997 – REVISED APRIL 1999
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
Output-enable (OE) and direction-control (DIR) inputs are provided to control the transceiver functions. In the
transceiver mode, data present at the high-impedance port may 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.
When an output function is disabled, the input function is still 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.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
When VCC is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 1.5 V, 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.
These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry
disables the outputs, preventing damaging current backflow through the devices when they are powered down.
The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,
which prevents driver conflict.
The SN54LVTH16646 is characterized for operation over the full military temperature range of –55
°C to 125°C.
The SN74LVTH16646 is characterized for operation from –40
°C to 85°C.
FUNCTION TABLE
INPUTS
DATA I/O
OPERATION OR FUNCTION
OE
DIR
CLKAB
CLKBA
SAB
SBA
A1–A8
B1–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 bus
† The data-output functions may 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.


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