DM74S138N ,Decoder/DemultiplexerFeatures
These Schottky-clamped circuits are designed to be used in I Designed specifically for ..
DM74S139N ,Decoder/Demultiplexerapplications.
The S139 comprises two separate two-Iine-to-four-Iine de-
coders in a single pack ..
DM74S140N ,7 V, dual 4-input NAND 50 Ohm line driverGeneral Description
This device contains two independent line driver gates each
of which perfor ..
DM74S151N ,1-of-8 Data Selector/Multiplexer with Complementary OutputsFeatures
I Select one-of-eight data lines
I Performs parallel-to-serial conversion
I Permi ..
DM74S153N ,Dual 1-of-4 Line Data Selector/MultiplexerFeaturesEach of these data selectors/multiplexers contains invert-
DM74S138N-DM74S139N
7 V, decoder/demultiplexer
5138 0 S139
National .
, Semiconductor
DM54S138/DM74S138, DM54S139/DM74S139
Decoders/Demultiplexers
General Description
These Schottky-clamped circuits are designed to be used in
high-Porto-ttm memory-decoding or data-routing appli-
cations, requiring very short propagation delay times. In
high-performance memory systems these decoders can be
used to minimize the effects of system decoding. When
used with high-speed memories, the delay times of these
decoders are usually less than the typical access time of the
memory. This means that the effective system delay intro-
duced by the decoder is negligible.
The S138 decodes one-ot-eight lines, based upon the con-
ditions at the three binary select inputs and the three enable
inputs. Two active-Iow and one active-high enable inputs
reduce the need for external gates or inverters when ex-
panding. A 24-line decoder can be implemented with no ex-
ternal inverters. and a 32-Iine decoder requires only one
inverter. An enable input can be used as a data input for
demultiplexing applications.
The S139 comprises two separate two-Iine-to-four-line de-
coders in a single package. The active-Iow enable input can
be used as a data line in demultiplexing applications.
All of these decoders/demultiplexers feature fully buffered
inputs, presenting only one normalized load to its driving
circuit. All inputs are clamped with high-perfonnance
Schottky diodes to suppress line-ringing and simplify system
design.
Features
I: Designed specifically for high speed:
Memory decoders
Data transmission systems
I: S138 3-to-8-Iine decoders incorporates 3 enable inputs
to simplify cascading and/or data reception
n S139 contains two fully independent 2-to-4-line decod-
ers/demultiplexers
a Schottky clamped for high performance
I: Typical propagation delay time (3 levels of logic)
S138 8 ns
S139 7.5 ns
II Typical power dissipation
S138 245 mW
S139 300 mW
Connection Diagrams
Dual-ln-Llne Package
DATA OUTPUTS
Vcc vo v1 " " H vs "
bs I15 I14 ha I12 |11 I10 "
[lllll
1 2 a " " e ir la
A a c 62A (323 Gt " GND
L v 4 x V -" OUTPUT
SELECT ENABLE
TLfFt6466-1
Dual-ln-Llne Package
SELECT DATA OUTPUTS
ENABLE r A r A "
VCC G2 A2 B2 mm 2Y1 2V2 2Y3
I16 I15 " " I12 I11 I10 "
T Y Y T
1 2 3 " " " I T I e
ENABLE At BI we 1V1 1V2 tY3 GND
GI i " "
SELECT
DATA OUTPUTS
TL/F/6466-2
Order Number DM545138J, DM543139J, DM548138W, DM54139W, DM745138N or DM745139N
See NS Package Number J16A, NIGE or W16A
Absolute Maximum Ratings (Note)
It Mllltary/Aerospace speclfled devices are required,
please contact the National BemIttonduetor Sales
OfflcelDIstrlbutors for availability and ttpttttmeatlona.
Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
-55'' C) to + 125°C
0° C to + 7ty'C
-65' Cto +150°C
Recommended Operating Conditions
Note: The "Absolute Maximum Ratings" are those values
beyond which the safety of the device cannot be guaran-
teed. The device should not be operated at these limits. The
parametric values dafintad in the "Electrical Characteristics"
table am not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will define
the conditions for actual device operation.
DM54S138,S139 DM74B138,S139
Symbol Parameter Units
Mln Nom Max Min Nom Max
Vcc Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
VIH High Level Input Voltage 2 2 V
Vit. Low Level Input Voltage 0.8 0.8 V
IOH High Level Output Current --l -I mA
lot. Low Level Output Current 20 20 mA
TA Free Air Operating Temperature - 55 125 0 70 (
Electrical Characteristics over recommended operating free air temperature (unless otherwise noted)
Symbol Parameter Conditions Min Typ Max Unlts
(Note 1)
V. lnputClamp Voltage Vcc = Min, II = -18 mA -1.2 V
VOH High LBVBI Output Vcc = Min, IOH = Max DM54 2.5 3.4 V
Voltage " = Max, VIH = Min DM74 2 7 3.4
VOL Low Level Output Vcc = Min, kx --- Max 0 5 V
Voltage VIH = Min, VIL = Max .
l. lnputCurrent © Max Vcc = Max, VI = 5.5V
Input Voltage
IIH High Level lnputCurrent Vcc = Max, VI = 2.7V 50 pA
IIL Low Level Input Current Vcc = Max, V. = 0.5V -2 mA
los Short Circuit Vcc = Max DM54 -40 - 100 m A
Output Current (Note 2) DM74 _ 40 - 100
'00 Supply Current (S138) Vcc == Max (Note 3) 49 74 mA
ICC Supply Current (S139) Vcc = Max (Note 3) 60 90 mA
Note 1: All typicals are at Vcc = 5V, TA = 25°C.
Note 2: Nat more than one Dutput should be shorted at a time, and the duration should not exceed one second.
Note 3: Ice is measured with all outputs enabled and open.
GSLS 0 BSLS
$138 0 S139
'St38 Switching Characteristics
at Vcc = 5V and TA == 25''C (See Section 1 for Test Waveforms and Output Load)
From RL = 280n
(Input) Levels _ -
Symbol Parameter to of Delay CL _ " pF th. - so pF Unltg
(Output)
Mln Max Min Max
tpLH Propagation Delay Time Select to 2 7 9 ns
Low to High Level Output Output
tpHL Propagation Delay Time Select to
High to Low Level Output Output 2 10.5 14 ns
tpLH Propagation Delay Time Select to 3 12 1 4 ns
Low to High Level Output Output
tPHL Propagation Delay Time Select to 3 1 2 15 ns
High to Low Level Output Output
tpLH Propagation Delay Time Enable to 2 8 10 as
Low to High Level Output Output
tpHL Propagation Delay Time Enable to 2 1 1 1 4 ns
High to Low Level Output Output
tpLH Propagation Delay Time Enable to 3 1 1 1 3 ns
Low to High Level Output Output
tpHL Propagation Delay Time Enable to 3 1 1 1 4 ns
High to Low Level Output Output
'S139 Switching Characteristics
at Voc = 5V and TA = 25''C (See Section 1 for Test Waveforms and Output Load)
From Ru = 2800
(Input) Levels - _
Symbol Parameter to of Delay th. - 15 pF th. _ 50 pF Unlts
(Output)
Min Max Min Max
tpLH Propagation Delay Time Select to 2 7 5 10 ns
Low to High Level Output Output .
tpHL Propagation Delay Time Select to 2 10 13 ns
High to Low Level Output Output
tpLH Propagation Delay Time Select to 3 1 2 13 ns
Low to High Level Output Output
tPHL Propagation Delay Time Select to a 1 2 15 ns
High to Low Level Output Output
tpLH Propagation Delay Time Enable to 2 8 10 ns
Low to High Level Output Output
tpHL Propagation Delay Time Enable to 2 10 13 ns
High to Low Level Output Output
Function Tables
5138 S139
Inputs Outputs Inputs D m
Enable Select Enable Select
G1 62' c B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 " G B A Y0 Y1 " Y3
X H X X X H H H H H H H H H x X H H H H
L X X X X H H H H H H H H L L L L H H H
H L L L L L H H H H H H H L L H H L H H
H L L L H H L H H H H H H L H L H H L H
H L L H L H H L H H H H H L H H H H H L
H L L H H H H H L H H H H Ha=highetvetL--low1mmli--6trn'teareteitharktworNghkogkrkmr0
H L H L L H H H H L H H H
H L H L H H H H H H L H H
H L H H L H H H H H H L H
H L H H H H H H H H H H L
‘GZ-GZA+GZB
H = high level, L = low level. X = don't care (eitherlaw or high logic level)
Logic Diagrams
ENABLE
INPUTS
SELECT
INPUTS
ENABLE 61%
SELECT
F DATA
OUTPUTS
TL/F/6456-3
Dr-lil-w,
INPUTS BI H be
' DATA
OUTPUTS
t ) 2V0
ENABLE oz "i'-'-'-)
TL/Fm4titF-4
sets 0 9€ls
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
National Semiconductor was acquired by Texas Instruments.
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This file is the datasheet for the following electronic components:
DM54S138W - product/dm54s138w?HQS=T|-nu|I-nulI-dscatalog-df-pf-null-wwe
DM54S139W - product/dm54s139w?HQS=T|-nu|I-nulI-dscatalog-df—pf-null-wwe
DM54S138J - product/dm54s138]?HQS=T|—nu|I-nulI-dscatalog-df—pf—nuII-wwe
DM54S139J - product/dm54s139]?HQS=T|-nu|I-nulI—dscatalog-df—pf—nuII-wwe
DM74S138N - product/dm74s138n?HQS=T|-null-nulI-dscatalog-df-pf-null-wwe
DM74S139N - product/dm74s139n?HQS=T|-nu|I-nulI-dscatalog-df-pf-nuIl-wwe
