3-TO-8 LINE DECODER/DEMULTIPLEXER These devices identical pinout

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3-TO-8 LINE DECODER/DEMULTIPLEXER These devices identical pinout

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GD54/74HC138, GD54/74HCT138
3-TO-8 LINE DECODER/DEMULTIPLEXER
These devices identical pinout 54/74LS138. Each device Binary select decodes 3-Bit address 1-of-8 active-LOW outputs. This device features three chip enable inputs. active-LOW active-HIGH facilitate demultiplexing, cascading, chip-selecting functions. These devices characterized operation over wide temperature ranges meet industry military specifications
Power consumption characteristic CMOS devices
Output drive capability: Loads Min.
Operating speed superior
Wide operating voltage range: volts
volts
input curent: Max.
quiescent current: 80fiA Max. (74HC)
High noise immunity characteristic CMOS
Diode protection inputs
Configuration
ao[t
23*0
a2[t
Suffix-Blank Plastic Dual Line Package Suffix-J Ceramic Dual Line Package Suffix-D Small Outline Package
Function Table
inputs outputs
HIGH voltage level voltage level don't care
This Material Copyrighted Respective Manufacturer
4-173
GD54/74HC138, GD54/74HCT138
Absolute Maximum Ratings
SYMBOL PARAMETER CONDITIONS MAX. UNIT
Supply voltage -0.5
input output diode current V.C-0.5 V,>Vct 0.5V
output source sink current 5V<Vo<Vcc 0.5V
current [50l
Storage temperature range
Power dissipation package above derate linearly with 8mW/K
Lead temperature distance from case sec(CERAMIC) sec(PLASTIC)
Recommended Operating Conditions
CHARACTERISTIC LIMITS UNITS
Supply-Voltage Range Vcc: GD54/74HC Types GD54/74HCT Types
Input Output Voltage
Operating Temperature GD74 Types GD54 Types
Input Rise Fall times GD54 74HC Types GD54 74HCT Types 4.5V 1000
Logic Diagram
Fig. Logic diagram
4-174
This Material Copyrighted Respective Manufacturer
GD54/74HC138, GD54/74HCT138
Electrical Characteristics
SYMBOL PARAMETER TEST CONDITION GD74HC138 GD54HC138 UNIT
MIN. MIN. MIN. MAX.
HIGH level input Voltage 3.15 3.15
level input voltage
HIGH level output voltage lOH=-20MA
lOH=-4mA -5.2mA 5.48 5.34
level output voltage 20^A
l0L=4mA lOL=5.2mA 0.15 0.26 0.26 0.33
I'INI Input leakage Current
Quiescent Supply Current l0ut
Electrical Characteristics
SYMBOL PARAMETER TEST CONDITION GD74HCT1 GD54HCT1 UNIT
MIN. TYP. MAX. MIN. MIN.
HIGH level input Voltage
level input voltage
HIGH level output voltage lOH=-20,iA
l0H=-4mA 3.98
level output voltage 20^A
lOL=4mA 0.17 0.26
I'inI Input leakage Current Vccor
Quiescent Supply Current 'out^OfA
This Material Copyrighted Respective Manufacturer
GD54/74HC138, GD54/74HCT138
Characteristics tr=tf=6ns Cu=50
SYMBOL PARAMETER GD74HC138 GD54HC138 UNIT
MIN. TYP. MAX. MIN. MAX. MIN. MAX.
'PLH Propagation Delay Time
'PLH 'PHL Propagation Delay Time
'TLH Output Transition Time
fTHL
Characteristics HCT: tr=tf=6ns CL=50
SYMBOL PARAMETER GD74HCT138 GD54HCT138 UNIT
MIN. TYP. MAX. MIN. MAX. MIN. MAX.
'PLH 'PHL Propagation Delay Time
'PLH Propagation Delay Time E2to
'tlh 'thl Output Transition Time
Waveforms
INPUT
lPHL
OUTPUT lTLH
Fig. Waveforms showing address input
(An) enable input (E3) output (7n) pro-
pagation delays output transition times.
tNPUT
OUTPUT
Fig. Waveforms showing enable input (En) output (Yn) propagation delays output transition times.
Note waveforms
V,=GND V,=GND
4-176
This Material Copyrighted Respective Manufacturer

3-TO-8 LINE DECODER/DEMULTIPLEXER These devices identical pinout

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