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CD74HC138 Datasheet(PDF) 2 Page - Texas Instruments

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Part No. CD74HC138
Description  High Speed CMOS Logic 3-to-8 Line Decoder/ Demultiplexer Inverting and Non-Inverting
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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Description
The Harris CD74HC138, CD74HC238 and CD74HCT138,
CD74HCT238 are high speed silicon gate CMOS decoders
well suited to memory address decoding or data routing
applications. Both circuits feature low power consumption
usually associated with CMOS circuitry, yet have speeds
comparable to low power Schottky TTL logic. Both circuits
have three binary select inputs (A0, A1 and A2). If the device
is enabled, these inputs determine which one of the eight
normally high outputs of the HC/HCT138 series will go low
or which of the normally low outputs of the HC/HCT238
series will go high.
Two active low and one active high enables (E1, E2, and E3)
are provided to ease the cascading of decoders. The
decoder’s 8 outputs can drive 10 low power Schottky TTL
equivalent loads.
Functional Diagram
Ordering Information
PART NUMBER
TEMP. RANGE (oC)
PACKAGE
PKG.
NO.
CD74HC138E
-55 to 125
16 Ld PDIP
E16.3
CD74HCT138E
-55 to 125
16 Ld PDIP
E16.3
CD74HC238E
-55 to 125
16 Ld PDIP
E16.3
CD74HCT238E
-55 to 125
16 Ld PDIP
E16.3
CD74HC138M
-55 to 125
16 Ld SOIC
M16.15
CD74HCT138M
-55 to 125
16 Ld SOIC
M16.15
CD74HC238M
-55 to 125
16 Ld SOIC
M16.15
CD74HCT238M
-55 to 125
16 Ld SOIC
M16.15
CD74HC138SM
-55 to 125
16 Ld SSOP
M16.209
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer and die for this part number is available which meets all
electrical specifications. Please contact your local sales office or
Harris customer service for ordering information.
Ordering Information
PART NUMBER
TEMP. RANGE (oC)
PACKAGE
PKG.
NO.
TRUTH TABLE CD74HC138, CD74HCT138
INPUTS
OUTPUTS
ENABLE
ADDRESS
E3
E2
E1
A2
A1
A0
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
X
H
X
X
X
HHHHHHHH
L
XXXXX
H
H
H
H
H
H
H
H
X
H
X
X
X
X
HHHHHHHH
H
L
LLLLL
H
H
H
H
H
H
H
HL
L
L
LH
HLH
H
H
H
H
H
HL
L
L
HLH
HLH
H
H
H
H
H
L
L
L
HHHHH
L
HHHH
15
14
13
12
10
7
9
11
1
2
3
5
6
4
E3
E2
E1
A2
A1
A0
Y0
Y7
Y6
Y5
Y4
Y3
Y2
Y1
Y0
Y7
Y6
Y5
Y4
Y3
Y2
Y1
HC/HCT
238
HC/HCT
138
CD74HC138, CD74HCT138, CD74HC238, CD74HCT238




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