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LK952 데이터시트(PDF) 2 Page - Texas Instruments

부품명 LK952
상세설명  3.3-V ABT OCTAL BUS RANSCEIVERS AND REGISTERS
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SN54LVTH2952, SN74LVTH2952
3.3V ABT OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3STATE OUTPUTS
SCBS710F − OCTOBER 1997 − REVISED OCTOBER 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information
The ’LVTH2952 devices consist of two 8-bit back-to-back registers that store data flowing in both directions
between two bidirectional buses. Data on the A or B bus is stored in the registers on the low-to-high transition
of the clock (CLKAB or CLKBA) input, provided that the clock-enable (CLKENAB or CLKENBA) input is low.
Taking the output-enable (OEAB or OEBA) input low accesses the data on either port.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup
or pulldown resistors with the bus-hold circuitry is not recommended.
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.
FUNCTION TABLE†
INPUTS
OUTPUT
CLKENAB
CLKAB
OEAB
A
OUTPUT
B
H
X
L
X
B0‡
X
H or L
L
X
B0‡
L
LL
L
L
LH
H
X
X
H
X
Z
† A-to-B data flow is shown; B-to-A data flow is similar,
but uses CLKENBA, CLKBA, and OEBA.
‡ Level of B before the indicated steady-state input
conditions were established


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