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INTEGRATED CIRCUITS
74LVC138A
3-to-8 line decoder/demultiplexer;
inverting
Product specification 1998 Apr 28
Page 2
Philips Semiconductors Product specification
74L VC138A3-to-8 line decoder/demultiplexer; inverting
FEA TURES
•Wide supply voltage range of 1.2 to 3.6 V
•In accordance with JEDEC standard no. 8-1A
•Inputs accept voltages up to 5.5 V
•CMOS lower power consumption
•Direct interface with TTL levels
•Demultiplexing capability
•Multiple input enable for easy expansion
•Ideal for memory chip select decoding
•Active LOW mutually exclusive outputs
•Output drive capability 50 transmission lines at 85°C
QUICK REFERENCE DATA
GND = 0 V; T
SYMBOL
t
NOTES:
is used to determine the dynamic power dissipation (PD in µW)
1. C
PD
P
= CPD × V
D
fi = input frequency in MHz; CL = output load capacity in pF;
f
= output frequency in MHz; VCC = supply voltage in V;
o
(C
L
2. The condition is VI = GND to V
= 25°C; tr = tf ≤ 2.5 ns
amb
PHL/tPLH
C
I
C
PD
2
× fi (CL × V
CC
2
× V
× fo) = sum of the outputs.
CC
PARAMETER CONDITIONS TYPICAL UNIT
Propagation delay
An to Yn,
E3 to Yn, En to Yn
Input capacitance 5.0 pF
Power dissipation capacitance per
package
2
× fo) where:
CC
CC
DESCRIPTION
The 74LVC138A is a low-voltage, low-power, high-performance
Si-gate CMOS device, superior to most advanced CMOS
compatible TTL families.
The 74LVC138A accepts three binary weighted address inputs (A
A
, A2) and when enabled, provides 8 mutually exclusive active
1
LOW outputs (Y
The 74LVC138A features three enable inputs: two active LOW (E
and E2) and one active HIGH (E3). Every output will be HIGH unless
E
and E2 are LOW and E3 is HIGH.
1
This multiple enable function allows easy parallel expansion of the
74LV138A to a 1-of-32 (5 lines to 32 lines) decoder with just four
74LV138A ICs and one inverter. The 74LV138A can be used as an
eight output demultiplexer by using one of the active LOW enable
inputs as the data input and the remaining enable inputs as strobes.
Unused enable inputs must be permanently tied to their appropriate
active HIGH or LOW state.
CL = 50 pF;
VCC = 3.3 V
VCC = 3.3 V
Notes 1 and 2
to Y7).
0
3.5
3.5
44 pF
ns
,
0
1
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA PKG. DWG. #
16-Pin Plastic SO –40°C to +85°C 74LVC138A D 74LVC138A D SOT109-1
16-Pin Plastic SSOP Type II –40°C to +85°C 74LVC138A DB 74LVC138A DB SOT338-1
16-Pin Plastic TSSOP Type I –40°C to +85°C 74LVC138A PW 74LVC138APW DH SOT403-1
PIN CONFIGURATION
1
A
0
A
2
1
3
A
2
4
E
1
5
E
2
6
E
3
7
Y
7
8
GND
1998 Apr 28 853–1943 19308
V
16
Y
15
Y
14
Y
13
Y
12
Y
11
Y
10
Y
9
SV00553
CC
0
0
0
0
0
0
0
LOGIC DIAGRAM
2
1
2
3
4
5
6
E
1
E
2
E
3
Y
A
0
Y
A
1
Y
A
2
Y
Y
Y
Y
Y
0
1
2
3
4
5
6
7
SV00554
15
14
13
12
11
10
9
7
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Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
PIN DESCRIPTION
PIN NUMBER SYMBOL NAME AND FUNCTION
1, 2, 3 A0 to A
4, 5 E1, E
6 E
15, 14, 13, 12,
11, 10, 9, 7
3
Y0 to Y
2
Address inputs
2
Enable inputs (active LOW)
Enable inputs (active HIGH)
Outputs
7
8 GND Ground (0 V)
16 V
CC
Positive supply voltage
LOGIC SYMBOL (IEEE/IEC)
0
0
1
2
3
4
5
6
1
2
2
3
4
5
&
6
7
(a) (b)
15
14
13
12
11
10
9
7
X/YDX
1
1
2
2
4
3
&
4
5
6
0
1
2
3
4
5
6
EN
7
SV00555
15
14
13
12
11
10
9
7
FUNCTIONAL DIAGRAM
A
1
1
A
2
2
3
4
5
6
A
E
E
E
3
1
2
3
3-to-8
DECODER
ENABLE
EXITING
Y
0
Y
1
Y
2
Y
3
Y
4
Y
5
Y
6
Y
7
SV00556
15
14
13
12
11
10
9
7
FUNCTION TABLE
INPUTS OUTPUTS
E
1
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
NOTES:
H = HIGH voltage level
L = LOW voltage level
X = don’t care
E
2
E
3
A
A
0
1
A
2
Y
0
Y
1
Y
2
Y
3
Y
4
Y
5
Y
6
Y
7
1998 Apr 28
3
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Philips Semiconductors Product specification
SYMBOL
PARAMETER
CONDITIONS
UNIT
V
V
V
V
V
V
mW
74LVC138A3-to-8 line decoder/demultiplexer; inverting
RECOMMENDED OPERATING CONDITIONS
LIMITS
MIN MAX
DC supply voltage (for max. speed performance) 2.7 3.6
CC
DC supply voltage (for low-voltage applications) 1.2 3.6
T
V
amb
tr, t
DC input voltage range 0 5.5 V
I
DC output voltage range; output HIGH or LOW state 0 V
I/O
DC input voltage range; output 3-State 0 5.5
Operating free-air temperature range –40 +85 °C
Input rise and fall times
f
VCC = 1.2 to 2.7V
V
= 2.7 to 3.6V
CC
0
0
20
10
CC
ns/V
ABSOLUTE MAXIMUM RATINGS
1
In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0V).
SYMBOL
V
CC
I
IK
V
I
I
OK
DC supply voltage –0.5 to +6.5 V
DC input diode current VIt 0 –50 mA
DC input voltage Note 2 –0.5 to +6.5 V
DC output diode current V
PARAMETER CONDITIONS RATING UNIT
uVCC or VO t 0
O
"50
mA
DC output voltage; output HIGH or LOW Note 2 –0.5 to VCC +0.5
I
GND
I/O
I
T
stg
DC input voltage; output 3-State Note 2 –0.5 to 6.5
DC output source or sink current VO = 0 to V
O
, I
DC VCC or GND current
CC
CC
"50
"100
Storage temperature range –65 to +150 °C
mA
mA
Power dissipation per package
P
TOT
– plastic mini-pack (SO) above +70°C derate linearly with 8 mW/K 500
– plastic shrink mini-pack (SSOP and TSSOP) above +60°C derate linearly with 5.5 mW/K 500
NOTES:
1. Stresses beyond those listed 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 .
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
1998 Apr 28
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Philips Semiconductors Product specification
VIHHIGH level input voltage
V
VILLOW level input voltage
V
VOHHIGH level output voltage
V
IIInput leakage current
V
V
GND
"0.1
"5
A
74LVC138A3-to-8 line decoder/demultiplexer; inverting
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions. V oltages are referenced to GND (ground = 0V).
LIMITS
SYMBOL PARAMETER TEST CONDITIONS Temp = -40°C to +85°C UNIT
MIN TYP1MAX
V
LOW level output voltage
OL
p
I
CC
∆I
Quiescent supply current VCC = 3.6V; VI = VCC or GND; IO = 0 0.1 10 µA
Additional quiescent supply current per
CC
input pin
NOTE:
1. All typical values are at V
p
p
p
= 3.3V and T
CC
amb
VCC = 1.2V V
VCC = 2.7 to 3.6V 2.0
VCC = 1.2V GND
VCC = 2.7 to 3.6V 0.8
VCC = 2.7V; VI = VIH or VIL; IO = –12mA VCC*0.5
VCC = 3.0V; VI = VIH or VIL; IO = –100µA VCC*0.2 V
VCC = 3.0V; VI = VIH or V
VCC = 3.0V; VI = VIH or V
IO = –12mA VCC*0.6
IL;
IO = –24mA VCC*1.0
IL;
VCC = 2.7V; VI = VIH or VIL; IO = 12mA 0.40
VCC = 3.0V; VI = VIH or VIL; IO = 100µA GND 0.20
VCC = 3.0V; VI = VIH or V
;
= 3.6V;
CC
= 5.5V or
I
IO = 24mA 0.55
IL;
VCC = 2.7V to 3.6V; VI = VCC –0.6V; IO = 0 5 500 µA
= 25°C.
CC
CC
V
µ
AC CHARACTERISTICS
GND = 0 V; tr = tf v 2.5 ns; CL = 50 pF; RL = 500; T
SYMBOL PARAMETER WAVEFORM VCC = 3.3V ±0.3V VCC = 2.7V UNIT
t
PHL/tPLH
t
PHL/tPLH
t
PHL/tPLH
Propagation delay
An to Y
n
Propagation delay
E3 to Y
n
Propagation delay
En to Y
n
NOTE:
1. These typical values are at V
= 3.3V and T
CC
amb
= –40C to +85C
amb
LIMITS
MIN TYP
1
MAX MIN MAX
Figure 1, 3 1.5 3.5 5.8 1.5 6.8 ns
Figure 1, 3 1.5 3.6 5.8 1.5 6.8 ns
Figure 2, 3 1.5 3.5 5.8 1.5 6.8 ns
= 25°C.
1998 Apr 28
5
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Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
AC WAVEFORMS
VM = 1.5 V at VCC 2.7 V
VM = 0.5 S VCC at VCC < 2.7 V
V
and VOH are the typical output voltage drop that occur with the
OL
output load.
V
CC
An, E
3
INPUT
GND
t
V
OH
Yn OUTPUT
V
OL
Figure 1. Input (nA) to output (nY) propagation delays.
V
CC
E1, E
2
INPUT
GND
V
OH
Yn OUTPUT
V
OL
Figure 2. 3-State enable and disable times.
t
PHL
PHL
V
M
t
V
M
SV00557
V
M
t
V
M
SV00558
PLH
PLH
TEST CIRCUIT
PULSE
GENERATOR
SWITCH POSITION
TEST S
t
PLH/tPHL
Figure 3. Load circuitry for switching times.
V
I
Open
S
1
500Ω
500Ω
SV00903
2 * V
Open
GND
CC
V
CC
V
O
D.U.T.
R
T
V
1
CC
< 2.7V V
50pF
C
L
V
I
CC
2.7V2.7–3.6V
1998 Apr 28
6
Page 7
Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
1998 Apr 28
7
Page 8
Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm SOT338-1
1998 Apr 28
8
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Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm SOT403-1
1998 Apr 28
9
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Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
Data sheet status
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.
[1]
[1] Please consult the most recently issued datasheet before initiating or completing a design.
Definitions
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one
or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.
Disclaimers
Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can
reasonably be expected to result in personal injury . Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
print code Date of release: 07-98
Document order number: 9397-750-04493
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