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SN74BCT2424A Datasheet(PDF) 2 Page - Texas Instruments

No. de pieza SN74BCT2424A
Descripción Electrónicos  16-BIT LATCHED MULTIPLEXER/DEMULTIPLEXER BUS TRANSCEIVERS
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SN74BCT2424A Datasheet(HTML) 2 Page - Texas Instruments

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SN74BCT2423A, SN74BCT2424A
16-BIT LATCHED MULTIPLEXER/DEMULTIPLEXER BUS TRANSCEIVERS
SDIS013 – JULY 1989 – REVISED AUGUST 1990
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
28 29
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31 32 33 34
SN74BCT2424A . . . FN PACKAGE
(TOP VIEW)
876
5
4
93
168 67
2
35 36 37 38 39
66 65
27
64 63 62 61
40 41 42 43
AENL
ABLEA
ABENL
GND
AB 7
AB 6
AB 5
AB 4
GND
AB 3
AB 2
AB 1
AB 0
VCC
A / BSEL
BLE
BENL
AENM
ALE
VCC
VCC
AB15
AB14
AB13
AB12
GND
AB11
AB10
AB 9
AB 8
GND
ABENM
ABLEB
BENM
description
The ’BCT2423A and ’BCT2424A are general-purpose 16-bit bidirectional transceivers with data storage latches
and byte control circuitry arranged for use in applications where two separate data paths must be multiplexed
onto, or demultiplexed from, a single data path. Typical applications include multiplexing and/or demultiplexing
of address and data information in microprocessor- or bus-interface applications. These devices are also useful
in memory-interleaving applications. The ’BCT2423A and ’BCT2424A offer inverted and noninverted data
paths, respectively.
The ’BCT2423A and ’BCT2424A were designed using Texas Instruments BiCMOS process, which features
bipolar drive characteristics, but also greatly reduces the standby power of the device when disabled. This is
valuable when the device is not performing an address or data transfer.
Three 16-bit I/O ports, A15 –A0, B15 –B0, and AB15 –AB0 are available for address and/or data transfer. The
AENM, AENL, BENM, BENL, ABENM, and ABENL inputs control the bus transceiver functions. These control
signals also allow byte-control of the most significant byte and least significant byte for each bus.
Address and/or data information can be stored using the internal storage latches. The ALE, BLE, ABLEA, and
ABLEB inputs are active low, and are used to control data storage. When the latch enable input is low, the latch
is transparent. When the latch enable input goes high, the data present at the inputs is latched, and remains
latched until the latch enable input is returned low.
Data on the ’A’ bus and ’B’ bus are multiplexed onto the ’AB’ bus via the A /BSEL control line. When A /BSEL
is low, A15 –A0 is mapped to the AB15 –AB0 outputs. When A /BSEL is high, B15 –B0 is mapped to the
AB15 –AB0 outputs.
The SN74BCT2423A and SN74BCT2424A are characterized for operation from 0
°C to 70°C.


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