INTEGRATED CIRCUITS

74F138
1-of-8 decoder/demultiplexer

Product specification 1991 Feb 14

IC15 Data Handbook


 
 
Philips Semiconductors Product specification

1-of-8 decoder/demultiplexer 74F138

FEATURE PIN CONFIGURATION

• Demultiplexing capability
• Multiple input enable for easy expansion A0 1 16 VCC

A1 2 15 Q0
• Ideal for memory chip select decoding A2 3 14 Q1
• Industrial temperature range available (–40°C to +85°C) E0 4 13 Q2

E1 5 12 Q3
DESCRIPTION
E2 6 11 Q4
The 74F138 decoder accepts three binary weighted inputs (A0, A1,
A2) and when enabled, provides eight mutually exclusive, active low Q7 7 10 Q5
outputs (Q0 – Q7). The device features three enable inputs; two GND 8 9 Q6
active low (E0, E1) and one active high (E2). Every output will be
high unless E0 and E1 are low and E2 is high. This multiple enable
SF00174
function allows easy parallel expansion of the device to 1-of-32
(5 lines to 32 lines) decoder with just four 74F138s and one inverter
(see Figure 1). The device can be used as an eight output TYPICAL TYPICAL
demultiplexer by using one of the active low enable inputs as the TYPE PROPAGATION SUPPLY CURRENT
data input and the remaining enable inputs as strobes. Enable DELAY (TOTAL)
inputs not used must be permanently tied to their appropriate active
74F138 5.8ns 13mA
high or active low state.

ORDERING INFORMATION
ORDER CODE
DESCRIPTION COMMERCIAL RANGE INDUSTRIAL RANGE PKG DWG #
VCC = 5V ±10%, Tamb = 0°C to +70°C VCC = 5V ±10%, Tamb = –40°C to +85°C
16-pin plastic DIP N74F138N I74F138N SOT38-4
16-pin plastic SO N74F138D I74F138D SOT109-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW
A0 – A2 Address inputs 1.0/1.0 20µA/0.6mA
E0, E1 Enable inputs (active Low) 1.0/1.0 20µA/0.6mA
E2 Enable input (active High) 1.0/1.0 20µA/0.6mA
Q0 – Q7 Data outputs 50/33 1.0mA/20mA
NOTE:
One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.

LOGIC SYMBOL IEC/IEEE SYMBOL

1 2 3
DMUX
1 15
0 0
2 14
0 1
G
A0 A1 A2 3
3 13
4 E0 2 2

5 E1 12
3
6 E2 11
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 4
4 10
& 5
5 9
6
15 14 13 12 11 10 9 7 6 7
7
VCC = Pin 16
GND = Pin 8
SF00175 SF00176

February 14, 1991 2 853–0343 01719

Philips Semiconductors Product specification

1-of-8 decoder/demultiplexer 74F138

LOGIC DIAGRAM

3
A2

2
A1

1
A0

4
E0
5
E1
6
E2
15 14 13 12 11 10 9 7
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
VCC = Pin 16
GND = Pin 8
SF00177

FUNCTION TABLE
INPUTS OUTPUTS
E0 E1 E2 A0 A1 A2 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
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

APPLICATION

A0
A1
A2
A3
A4 74F04
H

E2 A0 A1 A2 E2 A0 A1 A2 E2 A0 A1 A2 E2 A0 A1 A2
E1 E1 E1 E1
E0
74F138 E0
74F138 E0
74F138 E0
74F138

Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7

Q0 Q31

SF00178

Figure 1. Expansion of 1-of-8 Decoding

February 14, 1991 3

Philips Semiconductors Product specification

1-of-8 decoder/demultiplexer 74F138

ABSOLUTE MAXIMUM RATINGS

(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free air temperature range.)
SYMBOL PARAMETER RATING UNIT
VCC Supply voltage –0.5 to +7.0 V
VIN Input voltage –0.5 to +7.0 V
IIN Input current –30 to +5 mA
VOUT Voltage applied to output in High output state –0.5 to VCC V
IOUT Current applied to output in Low output state 40 mA
Commercial range 0 to +70 °C
Tamb Operating free-air
free air temperature range
Industrial range –40 to +85 °C
Tstg Storage temperature range –65 to +150 °C

RECOMMENDED OPERATING CONDITIONS

LIMITS
SYMBOL PARAMETER UNIT
MIN NOM MAX
VCC Supply voltage 4.5 5.0 5.5 V
VIH High-level input voltage 2.0 V
VIL Low-level input voltage 0.8 V
IIK Input clamp current –18 mA
IOH High-level output current –1 mA
IOL Low-level output current 20 mA
Commercial range 0 +70 °C
Tambb Operating
O erating free-air tem
temperature
erature range
Industrial range –40 +85 °C

DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
SYMBOL PARAMETER TEST CONDITIONS1 UNIT
MIN TYP2 MAX

VCC = MIN,, VIL = MAX,, ±10%VCC 2.5 V

VOH
O High level output voltage
High-level IOH
O = MAX
VIH = MIN
±5%VCC 2.7 3.4 V

VCC = MIN,, VIL = MAX,, ±10%VCC 0.30 0.50 V

VOL
O Low level output voltage
Low-level IOL
O = MAX
VIH = MIN
±5%VCC 0.30 0.50 V
VIK Input clamp voltage VCC = MIN, II = IIK –0.73 –1.2 V
II Input current at maximum input voltage VCC = MAX, VI = 7.0V 100 µA
IIH High-level input current VCC = MAX, VI = 2.7V 20 µA
IIL Low-level input current VCC = MAX, VI = 0.5V –0.6 mA
IOS Short-circuit output current3 VCC = MAX –60 –150 mA
ICC Supply current4 (total) VCC = MAX 13 20 mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at VCC = 5V, Tamb = 25°C.
3. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, IOS tests should be performed last.
4. Measure ICC, outputs must be open, VIN on all inputs = 4.5V.

February 14, 1991 4

Philips Semiconductors Product specification

1-of-8 decoder/demultiplexer 74F138

AC ELECTRICAL CHARACTERISTICS
LIMITS
VCC = +5.0V VCC = +5.0V ± 10% VCC = +5.0V ± 10%
TEST Tamb = +25°C Tamb = 0°C to +70°C Tamb = –40°C to +85°C
SYMBOL PARAMETER UNIT
CONDITION CL = 50pF CL = 50pF CL = 50pF
RL = 500Ω RL = 500Ω RL = 500Ω
MIN TYP MAX MIN MAX MIN MAX
tPLH Propagation delay 3.5 5.6 7.0 3.5 8.0 3.0 8.5
Waveform 1, 2 ns
tPHL An to Qn 4.0 6.1 8.0 4.0 9.0 3.5 9.0
tPLH Propagation delay 3.5 6.4 7.0 3.5 8.0 3.0 8.0
Waveform 2 ns
tPHL E0 or E1 to Qn 3.0 5.3 7.0 3.0 7.5 3.0 7.5
tPLH Propagation delay 4.0 6.2 8.0 4.0 9.0 4.0 9.5
Waveform 1 ns
tPHL E2 to Qn 3.5 5.6 7.5 3.5 8.5 3.5 8.5

AC WAVEFORMS
For all waveforms, VM = 1.5V

An, E2
VM VM An, E0, E1 VM VM

tPHL tPLH tPHL tPLH

VM VM VM VM
Qn Qn

SF00179 SF00180

Waveform 1. Propagation Delay for Inverting Outputs Waveform 2. Propagation Delay for Non-Inverting Outputs

TEST CIRCUIT AND WAVEFORMS

VCC tw AMP (V)

90% 90%
NEGATIVE
VM VM
PULSE
10% 10%
VIN VOUT 0V
PULSE D.U.T.
GENERATOR tTHL (tf ) tTLH (tr )

RT CL RL tTLH (tr ) tTHL (tf )

AMP (V)
90% 90%
POSITIVE
PULSE VM VM

Test Circuit for Totem-Pole Outputs 10% 10%

tw 0V

DEFINITIONS: Input Pulse Definition

RL = Load resistor;
see AC ELECTRICAL CHARACTERISTICS for value. INPUT PULSE REQUIREMENTS
CL = Load capacitance includes jig and probe capacitance; family
see AC ELECTRICAL CHARACTERISTICS for value. amplitude VM rep. rate tw tTLH tTHL
RT = Termination resistance should be equal to ZOUT of
74F 3.0V 1.5V 1MHz 500ns 2.5ns 2.5ns
pulse generators.

SF00006

February 14, 1991 5

Philips Semiconductors Product specification

1-of-8 decoder/demultiplexer 74F138

DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4

1991 Feb 14 6
Philips Semiconductors Product specification

1-of-8 decoder/demultiplexer 74F138

SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

1991 Feb 14 7
Philips Semiconductors Product specification

1-of-8 decoder/demultiplexer 74F138

Data sheet status

Data sheet Product Definition [1]
status status

Objective Development This data sheet contains the design target or goal specifications for product development.
specification Specification may change in any manner without notice.

Preliminary Qualification This data sheet contains preliminary data, and supplementary data will be published at a later date.
specification Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
Product Production This data sheet contains final specifications. Philips Semiconductors reserves the right to make
specification changes at any time without notice in order to improve design and supply the best possible product.

[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  Copyright Philips Electronics North America Corporation 1998

811 East Arques Avenue All rights reserved. Printed in U.S.A.
P.O. Box 3409
Sunnyvale, California 94088–3409 print code Date of release: 10-98
Telephone 800-234-7381
Document order number: 9397-750-05076


 
 
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