SCLS171E − MARCH 1984 − REVISED SEPTEMBER 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DOperating Voltage Range of 4.5 V to 5.5 V
DOutputs Can Drive Up To 10 LSTTL Loads
DLow Power Consumption, 80-µA Max ICC
DTypical tpd = 17 ns
D±4-mA Output Drive at 5 V
DLow Input Current of 1 µA Max
DInputs Are TTL-Voltage Compatible
DDesigned Specifically for High-Speed
Memory Decoders and Data Transmission
Systems
DIncorporate Three Enable Inputs to Simplify
Cascading and/or Data Reception
3212019
910111213
4
5
6
7
8
18
17
16
15
14
Y1
Y2
NC
Y3
Y4
C
G2A
NC
G2B
G1
B
A
NC
Y6
Y5 V
Y0
Y7
GND
NC
SN54HCT138 ...FK PACKAGE
(TOP VIEW)
CC
NC − No internal connection
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A
B
C
G2A
G2B
G1
Y7
GND
VCC
Y0
Y1
Y2
Y3
Y4
Y5
Y6
SN54HCT138 ...J OR W PACKAGE
SN74HCT138 . . . D, N, NS, OR PW PACKAGE
(TOP VIEW)
description/ordering information
The ’HCT138 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 can
minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable
circuit, the 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.
ORDERING INFORMATION
TAPACKAGE†ORDERABLE
PART NUMBER TOP-SIDE
MARKING
PDIP − N Tube of 25 SN74HCT138N SN74HCT138N
Tube of 40 SN74HCT138D
SOIC − D Reel of 2500 SN74HCT138DR HCT138
−40°C to 85°C
SOIC − D
Reel of 250 SN74HCT138DT
HCT138
−40°C to 85°CSOP − NS Reel of 2000 SN74HCT138NSR HCT138
Tube of 90 SN74HCT138PW
TSSOP − PW Reel of 2000 SN74HCT138PWR HT138
TSSOP − PW
Reel of 250 SN74HCT138PWT
HT138
CDIP − J Tube of 25 SNJ54HCT138J SNJ54HCT138J
−55°C to 125°CCFP − W Tube of 150 SNJ54HCT138W SNJ54HCT138W
−55 C to 125 C
LCCC − FK Tube of 55 SNJ54HCT138FK SNJ54HCT138FK
†Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright 2003, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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SCLS171E − MARCH 1984 − REVISED SEPTEMBER 2003
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description/ordering information (continued)
The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two
active-low (G) and one active-high (G) enable inputs 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.
FUNCTION TABLE
INPUTS
OUTPUTS
ENABLE SELECT
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
XXHXXXHHHHHHHH
LXXXXXHHHHHHHH
HLLLLLLHHHHHHH
HLLLLHHLHHHHHH
HLLLHLHHLHHHHH
HLLLHHHHHLHHHH
HLLHLLHHHHLHHH
HLLHLHHHHHHLHH
HLLHHLHHHHHHLH
H L L H H H H H H H H H H L
SCLS171E − MARCH 1984 − REVISED SEPTEMBER 2003
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic diagram (positive logic)
A
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
B
C
G1
G2A
G2B
Pin numbers shown are for the D, J, N, NS, PW, and W packages.
1
2
3
6
4
5
15
14
13
12
11
10
9
7
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC −0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, IO (VO = 0 to VCC) ±25 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through VCC or GND ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 2): D package 73°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 67°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NS package 64°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 108°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg −65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
SCLS171E − MARCH 1984 − REVISED SEPTEMBER 2003
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54HCT138 SN74HCT138
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V
VIH High-level input voltage VCC = 4.5 V to 5.5 V 2 2 V
VIL Low-level input voltage VCC = 4.5 V to 5.5 V 0.8 0.8 V
VIInput voltage 0 VCC 0 VCC V
VOOutput voltage 0 VCC 0 VCC V
∆t/∆vInput transition rise/fall time 500 500 ns
TAOperating free-air temperature −55 125 −40 85 °C
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25°C SN54HCT138 SN74HCT138
UNIT
PARAMETER
TEST CONDITIONS
V
CC MIN TYP MAX MIN MAX MIN MAX
UNIT
VOH
VI = VIH or VIL
IOH = −20 µA
4.5 V
4.4 4.499 4.4 4.4
V
VOH VI = VIH or VIL IOH = −4 mA 4.5 V 3.98 4.3 3.7 3.84 V
VOL
VI = VIH or VIL
IOL = 20 µA
4.5 V
0.001 0.1 0.1 0.1
V
VOL VI = VIH or VIL IOL = 4 mA 4.5 V 0.17 0.26 0.4 0.33 V
IIVI = VCC or 0 5.5 V ±0.1 ±100 ±1000 ±1000 nA
ICC VI = VCC or 0, IO = 0 5.5 V 8 160 80 µA
∆ICC†One input at 0.5 V or 2.4 V,
Other inputs at 0 or VCC 5.5 V 1.4 2.4 3 2.9 mA
Ci4.5 V
to 5.5 V 3 10 10 10 pF
†This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or VCC.
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
VCC
TA = 25°C SN54HCT138 SN74HCT138
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC MIN TYP MAX MIN MAX MIN MAX
UNIT
A, B, or C
Any Y
4.5 V 23 36 54 45
tpd
A, B, or C Any Y 5.5 V 17 32 49 34
ns
tpd
Enable
Any Y
4.5 V 22 33 50 42 ns
Enable Any Y 5.5 V 18 30 45 38
tt
Y
4.5 V 12 15 22 19
ns
t
t
Y
5.5 V 11 14 20 17
ns
operating characteristics, TA = 25°C
PARAMETER TEST CONDITIONS TYP UNIT
Cpd Power dissipation capacitance No load 85 pF
SCLS171E − MARCH 1984 − REVISED SEPTEMBER 2003
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
1.3 V1.3 V 0.3 V0.3 V 2.7 V 2.7 V 3 V
0 V
trtf
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT RISE AND FALL TIMES
1.3 V
1.3 V1.3 V 10%10% 90% 90%
3 V
VOH
VOL
0 V
trtf
Input
In-Phase
Output
1.3 V
tPLH tPHL
1.3 V 1.3 V
10% 10% 90%90% VOH
VOL
tr
tf
tPHL tPLH
Out-of-Phase
Output
Test
Point
From Output
Under Test
LOAD CIRCUIT
NOTES: A. CL includes probe and test-fixture capacitance.
B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.
C. The outputs are measured one at a time with one input transition per measurement.
D. tPLH and tPHL are the same as tpd.
CL = 50 pF
(see Note A)
Figure 1. Load Circuit and Voltage Waveforms
PACKAGE OPTION ADDENDUM
www.ti.com 25-Jan-2012
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
85504012A ACTIVE LCCC FK 20 1 TBD Call TI Call TI
8550401EA ACTIVE CDIP J 16 1 TBD Call TI Call TI
8550401FA ACTIVE CFP W 16 1 TBD A42 N / A for Pkg Type
JM38510/65852BEA ACTIVE CDIP J 16 1 TBD A42 N / A for Pkg Type
M38510/65852BEA ACTIVE CDIP J 16 1 TBD A42 N / A for Pkg Type
SN54HCT138J ACTIVE CDIP J 16 1 TBD A42 N / A for Pkg Type
SN74HCT138D ACTIVE SOIC D 16 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138DE4 ACTIVE SOIC D 16 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138DG4 ACTIVE SOIC D 16 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138DR ACTIVE SOIC D 16 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138DRE4 ACTIVE SOIC D 16 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138DRG4 ACTIVE SOIC D 16 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138DT ACTIVE SOIC D 16 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138DTE4 ACTIVE SOIC D 16 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138DTG4 ACTIVE SOIC D 16 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138N ACTIVE PDIP N 16 25 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type
SN74HCT138N3 OBSOLETE PDIP N 16 TBD Call TI Call TI
SN74HCT138NE4 ACTIVE PDIP N 16 25 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type
SN74HCT138NSR ACTIVE SO NS 16 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138NSRE4 ACTIVE SO NS 16 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138NSRG4 ACTIVE SO NS 16 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
PACKAGE OPTION ADDENDUM
www.ti.com 25-Jan-2012
Addendum-Page 2
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
SN74HCT138PW ACTIVE TSSOP PW 16 90 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138PWE4 ACTIVE TSSOP PW 16 90 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138PWG4 ACTIVE TSSOP PW 16 90 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138PWLE OBSOLETE TSSOP PW 16 TBD Call TI Call TI
SN74HCT138PWR ACTIVE TSSOP PW 16 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138PWRE4 ACTIVE TSSOP PW 16 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138PWRG4 ACTIVE TSSOP PW 16 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138PWT ACTIVE TSSOP PW 16 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138PWTE4 ACTIVE TSSOP PW 16 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74HCT138PWTG4 ACTIVE TSSOP PW 16 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SNJ54HCT138FK ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type
SNJ54HCT138J ACTIVE CDIP J 16 1 TBD A42 N / A for Pkg Type
SNJ54HCT138W OBSOLETE CFP W 16 TBD Call TI Call TI
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
PACKAGE OPTION ADDENDUM
www.ti.com 25-Jan-2012
Addendum-Page 3
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF SN54HCT138, SN74HCT138 :
•Catalog: SN74HCT138
•Military: SN54HCT138
NOTE: Qualified Version Definitions:
•Catalog - TI's standard catalog product
•Military - QML certified for Military and Defense Applications
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
SN74HCT138NSR SO NS 16 2000 330.0 16.4 8.2 10.5 2.5 12.0 16.0 Q1
SN74HCT138PWR TSSOP PW 16 2000 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1
SN74HCT138PWT TSSOP PW 16 250 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
SN74HCT138NSR SO NS 16 2000 367.0 367.0 38.0
SN74HCT138PWR TSSOP PW 16 2000 367.0 367.0 35.0
SN74HCT138PWT TSSOP PW 16 250 367.0 367.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 2
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