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 -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: 80jiA Max. (74HC)
High noise immunity characteristic CMOS
Diode protection inputs
Configuration
A0[T
>3*0
A2[T
jH92
I2[T
E3[T
T]Y6
Sulfix-Blank Plastic Dual Line Package Sulfix-J Ceramic Dual Line Package Suffix-D Small Outline Package
Function Table
inputs outputs
HIGH voltage level voltage level don't care
3-29
GD54/74HC138, GD54/74HCT138
Absolute Maximum Ratings
SYMBOL PARAMETER CONDITIONS UNIT
Supply voltage
input output diode current V,<-0 V,>Vcc |20|
output source sink current 5V<Vo<Vcc |25|
current |50|
Tsl9 Storage temperature range
Power dissipation package above derate linearly with 8mW'K
Lead temperature distance 1.32 from case sec(CERAMIC) sec(PLASTIC)
Recommended Operating Conditions
CHARACTERISTIC LIMITS UNITS
Supply-Voltage Range 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 1000
Logic Diagram
3-30
0004214
GD54/74HC138, GD54/74HCT138
Electrical Characteristics
SYMBOL PARAMETER TEST CONDITION GD74HC138 GD54HC138 UNIT
HIGH level input Voltage
level input voltage
HIGH level lOH=-20MA
output voltage lOH=-4mA
level V|n=V,h IOL=20mA
output voltage iol=4ma
HinI Input leakage Current
Quiescent Supply Current lc,ut
Electrical Characteristics
SYMBOL PARAMETER TEST CONDITION GD74HCT138 GD54HCT138 UNIT
HIGH level input Voltage
level input voltage
HIGH level output voltage lOH=-20MA
level output voltage 20MA
I'INI Input leakage Current Vccor
Quiescent Supply Current l0ut
3-31
GD54/74HC138, GD54/74HCT138
Characteristics tr=t,=6ns CL=50
SYMBOL PARAMETER GD74HC138 GD54HC138 UNIT
'plh 'phl Propagation Delay Time An,E3
'plh Propagation Delay Time
'tlh 'thl Output Transition Time
Characteristics HCT: tr=t,=6ns CL=50
SYMBOL PARAMETER GD74HCT138 GD54HCT138 UNIT
MIN.
(plh 'phl Propagation Delay Time
(plh fphl Propagation Delay Time
(tlh Output Transition Time
Waveforms
Fig. Waveforms showing address input (An) enable input (E3) output (Yn) propagation delays output transition times.
Fig- Waveforms showing enable input (En) output (Yn) propagation delays output transition times.
Note waveforms
Vm=50% V^GND V.=GND
3-32
4Q2fl7S7 00042cib lt>3
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