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HD74ALVCH16543 Datasheet

16-bit Registered Transceivers with 3-state Outputs

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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
VCC = 2.3 V to 3.6 V
Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)
Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C)
High output current ±24 mA (@VCC = 3.0 V)
Bus hold on data inputs eliminates the need for external pullup / pulldown resistors


Hitachi Power Semiconductor Device Electronic Components Datasheet

HD74ALVCH16543 Datasheet

16-bit Registered Transceivers with 3-state Outputs

No Preview Available !

HD74ALVCH16543
Function Table *1
Inputs
Output B
CEAB
LEAB
OEAB
A
HXXXZ
XXHXZ
L H L X B0 *2
LLLLL
L L L HH
H : High level
L : Low level
X : Immaterial
Z : High impedance
Notes 1. A to B data flow is shown; B to A flow control is the same except that it uses CEBA, LEBA, and
OEBA.
2. Output level before the indicated steady state input conditions were established.
2


Part Number HD74ALVCH16543
Description 16-bit Registered Transceivers with 3-state Outputs
Maker Hitachi Semiconductor
Total Page 13 Pages
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