DatasheetsPDF.com

1-OF-8 DECODER/DEMULTIPLEXER. 54LS138 Datasheet

DatasheetsPDF.com

1-OF-8 DECODER/DEMULTIPLEXER. 54LS138 Datasheet






54LS138 DECODER/DEMULTIPLEXER. Datasheet pdf. Equivalent




54LS138 DECODER/DEMULTIPLEXER. Datasheet pdf. Equivalent





Part

54LS138

Description

1-OF-8 DECODER/DEMULTIPLEXER



Feature


( DataSheet : www.DataSheet4U.com ) 1-O F-8 DECODER/ DEMULTIPLEXER The LSTTL / MSI SN54 / 74LS138 is a high speed 1-of -8 Decoder / Demultiplexer. This device is ideally suited for high speed bipol ar memory chip select address decoding. The multiple input enables allow paral lel expansion to a 1-of-24 decoder usin g just three LS138 devices or to a 1-of -32 decoder using .
Manufacture

Motorola

Datasheet
Download 54LS138 Datasheet


Motorola 54LS138

54LS138; four LS138s and one inverter. The LS138 is fabricated with the Schottky barrier diode process for high speed and is co mpletely compatible with all Motorola T TL families. SN54/74LS138 1-OF-8 DECO DER/ DEMULTIPLEXER LOW POWER SCHOTTKY • • • • • Demultiplexing Cap ability Multiple Input Enable for Easy Expansion Typical Power Dissipation of 32 mW Active Low Mutually Ex.


Motorola 54LS138

clusive Outputs Input Clamp Diodes Limit High Speed Termination Effects CONNECT ION DIAGRAM DIP (TOP VIEW) V CC 16 O0 1 5 O1 14 O2 13 O3 12 O4 11 O5 10 9 O6 J SUFFIX CERAMIC CASE 620-09 16 1 NOTE: The Flatpak version has the same pinou ts (Connection Diagram) as the Dual In- Line Package. 1 A0 2 A1 3 A2 4 E1 5 E2 6 E3 7 O7 8 GND 16 1 N SUFFIX PLASTIC CASE 648-08 PIN .


Motorola 54LS138

NAMES A0 – A2 E1, E2 E3 O0 – O7 Addr ess Inputs Enable (Active LOW) Inputs E nable (Active HIGH) Input Active LOW Ou tputs (Note b) LOADING (Note a) HIGH 0 .5 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. LOW 0 .25 U.L. 0.25 U.L. 0.25 U.L. 5 (2.5) U. L. 16 1 D SUFFIX SOIC CASE 751B-03 OR DERING INFORMATION SN54LSXXXJ SN74LSXXX N SN74LSXXXD Ceramic Plastic SOIC NOTE S: a) 1 TTL Unit Load .

Part

54LS138

Description

1-OF-8 DECODER/DEMULTIPLEXER



Feature


( DataSheet : www.DataSheet4U.com ) 1-O F-8 DECODER/ DEMULTIPLEXER The LSTTL / MSI SN54 / 74LS138 is a high speed 1-of -8 Decoder / Demultiplexer. This device is ideally suited for high speed bipol ar memory chip select address decoding. The multiple input enables allow paral lel expansion to a 1-of-24 decoder usin g just three LS138 devices or to a 1-of -32 decoder using .
Manufacture

Motorola

Datasheet
Download 54LS138 Datasheet




 54LS138
( DataSheet : www.DataSheet4U.com )
1-OF-8 DECODER/
DEMULTIPLEXER
The LSTTL / MSI SN54 / 74LS138 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 ex-
pansion to a 1-of-24 decoder using just three LS138 devices or to a 1-of-32
decoder using four LS138s and one inverter. The LS138 is fabricated with the
Schottky barrier diode process for high speed and is completely compatible
with all Motorola TTL families.
Demultiplexing Capability
Multiple Input Enable for Easy Expansion
Typical Power Dissipation of 32 mW
Active Low Mutually Exclusive Outputs
Input Clamp Diodes Limit High Speed Termination Effects
CONNECTION DIAGRAM DIP (TOP VIEW)
V CC O 0 O 1 O 2 O 3 O 4 O 5 O 6
16 15 14 13 12 11 10 9
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
1 2 3 4 56
78
A 0 A 1 A 2 E 1 E 2 E 3 O 7 GND
PIN NAMES
LOADING (Note a)
HIGH
LOW
A0 – A2
E1, E2
E3
O0 – O7
Address Inputs
Enable (Active LOW) Inputs
Enable (Active HIGH) Input
Active LOW Outputs (Note b)
0.5 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
5 (2.5) U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
Temperature Ranges.
LOGIC DIAGRAM
A2
3
A1
2
A0
1
E1 E2 E3
45
6
V CC = PIN 16
GND = PIN 8
= PIN NUMBERS
7
O7
9
O6
10
O5
11
O4
12
O3
13
O2
14
O1
15
O0
www.DataSheet4U.com
FAST AND LS TTL DATA
5-230
SN54/74LS138
1-OF-8 DECODER/
DEMULTIPLEXER
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
LOGIC SYMBOL
123
456
12 3
A0 A1 A2
E
O0 O1 O2 O3 O4 O5 O6 O7
15 14 13 12 11 10 9
7
V CC = PIN 16
GND = PIN 8




 54LS138
SN54 / 74LS138
FUNCTIONAL DESCRIPTION
The LS138 is a high speed 1-of-8 Decoder/Demultiplexer
fabricated with the low power Schottky barrier diode process.
The decoder accepts three binary weighted inputs (A0, A1, A2)
and when enabled provides eight mutually exclusive active
LOW Outputs (O0 – O7). The LS138 features three Enable in-
puts, two active LOW (E1, E2) and one active HIGH (E3). All
outputs will be HIGH unless E1 and E2 are LOW and E3 is
HIGH. This multiple enable function allows easy parallel ex-
pansion of the device to a 1-of-32 (5 lines to 32 lines) decoder
with just four LS138s and one inverter. (See Figure a.)
The LS138 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 appropri-
ate active HIGH or active LOW state.
TRUTH TABLE
INPUTS
OUTPUTS
E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6
HXXXXXHHHHHHH
XHXXXXHHHHHHH
XX L XXXHHHHHHH
L LHL L L LHHHHHH
L LHHL LHLHHHHH
L LHLHLHHLHHHH
L LHHHLHHHLHHH
L LHL LHHHHHLHH
L LHHLHHHHHHLH
L LHLHHHHHHHHL
L LHHHHHHHHHHH
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
O7
H
H
H
H
H
H
H
H
H
H
L
A0
A1
A2
A3
A4
H
123
A0 A1 A2
E
LS138
O0 O1 O2 O3 O4 O5 O6 O7
123
A0 A1 A2
E
LS138
O0 O1 O2 O3 O4 O5 O6 O7
123
A0 A1 A2
E
LS138
O0 O1 O2 O3 O4 O5 O6 O7
O0
Figure a
LS04
123
A0 A1 A2
E
LS138
O0 O1 O2 O3 O4 O5 O6 O7
O 31
FAST AND LS TTL DATA
5-231




 54LS138
SN54 / 74LS138
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
IOH Output Current — High
IOL Output Current — Low
Min Typ Max Unit
54 4.5 5.0 5.5
74 4.75 5.0 5.25
V
54 – 55 25 125 °C
74 0 25 70
54, 74
– 0.4
mA
54 4.0 mA
74 8.0
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
54
VIL Input LOW Voltage
74
0.7 Guaranteed Input LOW Voltage for
0.8 V All Inputs
VIK
VOH
Input Clamp Diode Voltage
Output HIGH Voltage
54
74
– 0.65 – 1.5
2.5 3.5
2.7 3.5
V VCC = MIN, IIN = – 18 mA
V VCC = MIN, IOH = MAX, VIN = VIH
V or VIL per Truth Table
VOL
Output LOW Voltage
54, 74
74
0.25 0.4
0.35 0.5
V IOL = 4.0 mA
V IOL = 8.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
IIH Input HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current
– 0.4 mA VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current (Note 1)
– 20
–100 mA VCC = MAX
ICC Power Supply Current
10
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
mA VCC = MAX
AC CHARACTERISTICS (TA = 25°C)
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay
Address to Output
Propagation Delay
Address to Output
Propagation Delay E1 or E2
Enable to Output
Propagation Delay E3
Enable to Output
Levels of
Delay
2
2
3
3
2
2
3
3
Limits
Min Typ Max
13 20
27 41
18 27
26 39
12 18
21 32
17 26
25 38
Unit
ns
ns
ns
ns
Test Conditions
VCC = 5.0 V
CL = 15 pF
V IN
V OUT
1.3 V
t PHL
1.3 V
AC WAVEFORMS
1.3 V
V IN
t PLH
1.3 V
V OUT
1.3 V
1.3 V
t PHL
1.3 V
t PLH
1.3 V
Figure 1
Figure 2
FAST AND LS TTL DATA
5-232






Recommended third-party 54LS138 Datasheet






@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)