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SN74LVC138ADBLE Datasheet(PDF) 2 Page - Texas Instruments

Part # SN74LVC138ADBLE
Description  3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN74LVC138ADBLE Datasheet(HTML) 2 Page - Texas Instruments

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
GQN OR ZQN PACKAGE
(TOP VIEW)
1
2
3
4
A
B
C
D
E
SN54LVC138A, SN74LVC138A
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SCAS291T – MARCH 1993 – REVISED JULY 2005
The 'LVC138A devices are designed for high-performance memory-decoding or data-routing applications
requiring very short propagation delay times. In high-performance memory systems, these decoders minimize the
effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, delay times
of these decoders and the enable time of the memory usually are less than the typical access time of the
memory. This means that the effective system delay introduced by the decoders is negligible.
The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two
active-low enable inputs and one active-high enable input reduce the need for external gates or inverters when
expanding. A 24-line decoder can be implemented without external inverters, and a 32-line decoder requires only
one inverter. An enable input can be used as a data input for demultiplexing applications.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators
in a mixed 3.3-V/5-V system environment.
TERMINAL ASSIGNMENTS
1
2
3
4
A
B
A
VCC
Y0
B
C
NC(1)
NC(1)
Y1
C
G2B
G2A
Y3
Y2
D
G1
NC(1)
NC(1)
Y4
E
GND
Y7
Y6
Y5
(1)
NC - No internal connection
SDFGDFGDFG
FUNCTION TABLE
ENABLE INPUTS
SELECT INPUTS
OUTPUTS
G1
G2A
G2B
C
B
A
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
H
X
X
X
X
H
H
H
H
H
H
H
H
X
X
H
X
X
X
H
H
H
H
H
H
H
H
L
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X
X
X
X
H
H
H
H
H
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H
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H
L
L
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L
H
H
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