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SN74ABT32543 Scheda tecnica(PDF) 2 Page - Texas Instruments

Il numero della parte SN74ABT32543
Spiegazioni elettronici  36-BIT REGISTERED BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
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SN74ABT32543 Scheda tecnica(HTML) 2 Page - Texas Instruments

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SN54ABT32543, SN74ABT32543
36BIT REGISTERED BUS TRANSCEIVERS
WITH 3STATE OUTPUTS
SCBS230B − JUNE 1992 − REVISED JULY 1994
5−2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
description (continued)
The A-to-B enable (CEAB) input must be low in order to enter data from A or to output data from B. If CEAB is
low and LEAB is low, the A-to-B latches are transparent; a subsequent low-to-high transition of LEAB puts the
A latches in the storage mode. With CEAB and OEAB both low, the 3-state B outputs are active and reflect the
data present at the output of the A latches. Data flow from B to A is similar but requires using the CEBA, LEBA,
and OEBA inputs.
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.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The SN54ABT32543 is characterized for operation over the full military temperature range of − 55
°C to 125°C.
The SN74ABT32543 is characterized for operation from − 40
°C to 85°C.
FUNCTION TABLE†
(each 18-bit section)
INPUTS
OUTPUT
CEAB
LEAB
OEAB
A
OUTPUT
B
H
X
X
X
Z
X
XH
X
Z
L
HL
X
B0‡
L
LL
L
L
L
L
L
H
H
† A-to-B data flow is shown; B-to-A flow control is the
same except that it uses CEBA, LEBA, and OEBA.
‡ Output level before the indicated steady-state input
conditions were established.


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