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MC74ACT138NG

P1-P3P4-P6P7-P9P10-P12
© Semiconductor Components Industries, LLC, 2006
March, 2006 − Rev. 6
1 Publication Order Number:
MC74AC138/D
MC74AC138, MC74ACT138
1−of−8
Decoder/Demultiplexer
The MC74AC138/74ACT138 is a high−speed 1−of−8
decoder/demultiplexer. This device is ideally suited for high−speed
bipolar memory chip select address decoding.
The multiple input enables allow parallel expansion to a 1−of−24
decoder using just three MC74AC138/74ACT138 devices or a
1−of−32 decoder using four MC74AC138/74ACT138 devices and one
inverter.
• Demultiplexing Capability
• Multiple Input Enable for Easy Expansion
• Active LOW Mutually Exclusive Outputs
• Outputs Source/Sink 24 mA
• ′ACT138 Has TTL Compatible Inputs
w These devices are available in Pb−free package(s). Specifications herein
apply to both standard and Pb−free devices. Please see our website at
www.onsemi.com for specific Pb−free orderable part numbers, or
contact your local ON Semiconductor sales office or representative.
V
CC
GNDA
0
A
1
A
2
E
1
E
2
E
3
1516 14 13 12 11 10
21 34567
9
8
O
7
O
0
O
1
O
2
O
3
O
4
O
5
O
6
Figure 1. Pinout: 16−Lead Packages Conductors
(Top View)
Figure 2. Logic Symbol
A
0
A
1
A
2
E
1
E
2
E
3
O
1
O
2
O
3
O
4
O
5
O
6
O
7
O
0
PIN ASSIGNMENT
PIN FUNCTION
A
0
−A
2
Address Inputs
E
1
−E
2
Enable Inputs
E
3
Enable Input
O
0
−O
7
Outputs
http://onsemi.com
DIP−16
N SUFFIX
CASE 648
1
16
SO−16
D SUFFIX
CASE 751B
1
16
Device Package Shipping
ORDERING INFORMATION
MC74AC138N
PDIP−16
25 Units/Rail
MC74AC138D
SOIC−16
48 Units/Rail
MC74AC138DR2 2500 Tape & Reel
TSSOP−16
DT SUFFIX
CASE 948F
MC74AC138DT
TSSOP−16
96 Units/Rail
MC74AC138DTR2
TSSOP−16
SOIC−16
2500 Tape & Reel
MC74ACT138N
PDIP−16
25 Units/Rail
MC74ACT138D
SOIC−16
48 Units/Rail
MC74ACT138DR2 2500 Tape & Reel
MC74ACT138DT
TSSOP−16
96 Units/Rail
MC74ACT138DTR2
TSSOP−16
SOIC−16
2500 Tape & Reel
1
16
See general marking information in the device marking
section on page 6 of this data sheet.
DEVICE MARKING INFORMATION
1
16
EIAJ−16
M SUFFIX
CASE 966
MC74AC138M
EIAJ−16
MC74AC138MEL
EIAJ−16
2000 Tape & Reel
MC74ACT138M
EIAJ−16
MC74ACT138MEL
EIAJ−16
2000 Tape & Reel
50 Units/Rail
50 Units/Rail
MC74AC138, MC74ACT138
http://onsemi.com
2
FUNCTIONAL DESCRIPTION
The MC74AC138/74ACT138 high−speed 1−of−8
decoder/demultiplexer accepts three binary weighted inputs
(A
0
, A
1
, A
2
) and, when enabled, provides eight mutually
exclusive active−LOW outputs (O
0
−O
7
). The
MC74AC138/74ACT138 features three Enable inputs, two
active−LOW (E
1
, E
2
) and one active−HIGH (E
3
). All
outputs will be HIGH unless E
1
and E
2
are LOW and E
3
is
HIGH. This multiple enabled function allows easy parallel
expansion of the device to a 1−of−32 (5 lines to 32 lines)
decoder with just four MC74AC138/74ACT138 devices
and one inverter (See Figure 4). The
MC74AC138/74ACT138 can be used as an 8−output
demultiplexer by using one of the active LOW Enable inputs
as the data input and the other Enable inputs as strobes. The
Enable inputs which are not used must be permanently tied
to their appropriate active−HIGH or active−LOW state.
TRUTH TABLE
Inputs Outputs
E
1
E
2
E
3
A
0
A
1
A
2
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
H X X X X X H H H H H H H H
X H X X X X H H H H H H H H
X X L X X X H H H H H H H H
L L H L L L L H H H H H H H
L L H H L L H L H H H H H H
L L H L H L H H L H H H H H
L L H H H L H H H L H H H H
L L H L L H H H H H L H H H
L L H H L H H H H H H L H H
L L H L H H H H H H H H L H
L L H H H H H H H H H H H L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
A
2
A
1
A
0
E
3
E
1
E
2
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
NOTE: This diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation
delays.
Figure 3. Logic Diagram
MC74AC138, MC74ACT138
http://onsemi.com
3
H
123 123 123 123
A
0
A
2
A
3
A
4
A
0
A
1
A
2
E
0
0
0
1
0
2
0
3
0
4
0
5
0
6
0
7
A
0
A
1
A
2
E
0
0
0
1
0
2
0
3
0
4
0
5
0
6
0
7
A
0
A
1
A
2
E
0
0
0
1
0
2
0
3
0
4
0
5
0
6
0
7
A
0
A
1
A
2
E
0
0
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
0
0
31
′04
Figure 4. Expansion to 1−of−32 Decoding
A
1
MAXIMUM RATINGS*
Symbol Parameter Value Unit
V
CC
DC Supply Voltage (Referenced to GND) −0.5 to +7.0 V
V
IN
DC Input Voltage (Referenced to GND) −0.5 to V
CC
+0.5 V
V
OUT
DC Output Voltage (Referenced to GND) −0.5 to V
CC
+0.5 V
I
IN
DC Input Current, per Pin ±20 mA
I
OUT
DC Output Sink/Source Current, per Pin ±50 mA
I
CC
DC V
CC
or GND Current per Output Pin ±50 mA
T
stg
Storage Temperature −65 to +150 °C
*Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recom-
mended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Typ Max Unit
V
CC
Supply Voltage
′AC 2.0 5.0 6.0
V
′ACT 4.5 5.0 5.5
V
IN
, V
OUT
DC Input Voltage, Output Voltage (Ref. to GND) 0 − V
CC
V
t
r
, t
f
Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs
V
CC
@ 3.0 V − 150 −
V
CC
@ 4.5 V − 40 − ns/V
V
CC
@ 5.5 V − 25 −
t
r
, t
f
Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs
V
CC
@ 4.5 V − 10 −
ns/V
V
CC
@ 5.5 V − 8.0 −
T
J
Junction Temperature (PDIP) − − 140 °C
T
A
Operating Ambient Temperature Range −40 25 85 °C
I
OH
Output Current − High − − −24 mA
I
OL
Output Current − Low − − 24 mA
1. V
IN
from 30% to 70% V
CC
; see individual Data Sheets for devices that differ from the typical input rise and fall times.
2. V
IN
from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.
P1-P3P4-P6P7-P9P10-P12

MC74ACT138NG

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Manufacturer:
ON Semiconductor
Description:
IC DECODER/DEMUX 1-8 HS 16DIP
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