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HD74ALVCH16543 Datasheet

  • HD74ALVCH16543

  • 16-bit Registered Transceivers with 3-state Outputs

  • 13頁(yè)

  • HITACHI

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HD74ALVCH16543
16-bit Registered Transceivers with 3-state Outputs
ADE-205-169A (Z)
2nd. Edition
December 1999
Description
The HD74ALVCH16543 can be used as two 8-bit transceivers or one 16-bit transceiver. Separate latch
enable (LEAB or
LEBA)
and output enable (OEAB or
OEBA)
inputs are provided for each register to
permit independent control in either direction of data flow. 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
CEBA, LEBA,
and
OEBA.
Active
bus hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
Features
鈥?/div>
V
CC
= 2.3 V to 3.6 V
鈥?/div>
Typical V
OL
ground bounce < 0.8 V (@V
CC
= 3.3 V, Ta = 25擄C)
鈥?/div>
Typical V
OH
undershoot > 2.0 V (@V
CC
= 3.3 V, Ta = 25擄C)
鈥?/div>
High output current
鹵24
mA (@V
CC
= 3.0 V)
鈥?/div>
Bus hold on data inputs eliminates the need for external pullup / pulldown resistors

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