54FCT138中文资料
54FCT138
1-of-8Decoder/Demultiplexer
General Description
The FCT138is a high-speed 1-of-8decoder/demultiplexer.This device is ideally suited for high-speed bipolar memory chip select address decoding.The multiple input enables al-low parallel expansion to a 1-of-24decoder using just three FCT138devices or a 1-of-32decoder using four FCT138de-vices and one inverter.
Features
n Demultiplexing capability
n Multiple input enable for easy expansion n Active LOW mutually exclusive outputs
n
Outputs sink capability of 32mA,source capability of 12mA
n TTL input and output level compatible n CMOS power consumption
n Standard Microcircuit Drawing (SMD)5962-8765401
Ordering Code
Military
Package Package Description
Number 54FCT138DMQB J16A 16-Lead Ceramic Dual-In-Line 54FCT138FMQB W16A 16-Lead Cerpack
54FCT138LMQB
E20A
20-Lead Ceramic Leadless Chip Carrier,Type C
Logic Symbols Pin Names Description A 0–A 2Address Inputs E 1–E 2Enable Inputs E 3Enable Input O 0–O 7
Outputs
Connection Diagrams
FACT ?is a registered trademark of Fairchild Semiconductor Corporation.
DS100963-1
IEEE/IEC
DS100963-7
Pin Assignment for DIP and Flatpak
DS100963-2
Pin Assignment
for LCC
October 1999
54FCT1381-of-8Decoder/Demultiplexer
?1999National Semiconductor Corporation https://www.wendangku.net/doc/b85688871.html,
Functional Description
The FCT138high-speed 1-of-8decoder/demultiplexer ac-cepts three binary weighted inputs (A 0,A 1,A 2)and,when enabled,provides eight mutually exclusive active-LOW out-puts (O 0–O 7).The FCT138features three Enable inputs,two active-LOW (E 1,E 2)and one active-HIGH (E 3).All out-puts will be HIGH unless E 1and E 2are LOW and E 3is HIGH.This multiple enable function allows easy parallel ex-pansion of the device to a 1-of-32(5lines to 32lines)de-coder with just four FCT138devices and one inverter (see Figure 1).The FCT138can be used as an 8-output demulti-plexer by using one of the active LOW Enable inputs as the data input and the other Enable inputs as strobes.The En-able inputs which are not used must be permanently tied to their appropriate active-HIGH or active-LOW state.Inputs
Outputs E 1E 2E 3A 0A 1A 2O 0O 1O 2O 3O 4O 5O 6O 7H 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
H =HIGH Voltage Level L =LOW Voltage Level X =Immaterial
Logic Diagram
DS100963-4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
54F C T 138
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Logic Diagram
(Continued)
D S 100963-5
F I
G U R E 1.E x p a n s i o n t o 1-o f -32D e c o d i n g
54FCT138
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3
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.Storage Temperature
?65?C to +150?C Ambient Temperature under Bias ?55?C to +125?C Junction Temperature under Bias Ceramic
?55?C to +175?C V CC Pin Potential to Ground Pin
?0.5V to +7.0V Input Voltage (Note 1)?0.5V to +7.0V Input Current (Note 1)
?30mA to +5.0mA
Voltage Applied to Any Output in the Disabled or Power-Off State ?0.5V to +5.5V in the HIGH State
?0.5V to V CC
Current Applied to Output
in LOW State (Max)
Twice the rated I OL (mA)
DC Latchup Source Current ?500mA
Recommended Operating Conditions
Free Air Ambient Temperature Military
?55?C to +125?C Supply Voltage Military
+4.5V to +5.5V
Minimum Input Edge Rate (?V/?t)Data Input 50mV/ns Enable Input
20mV/ns
Note 1:Absolute maximum ratings are those values beyond which damage to the device may occur.The databook specifications should be met,without exception,to ensure that the system design is reliable over its power supply,temperature,and output/input loading variables.National does not recom-mend operation of FACT ?circuits outside databook specifications.
DC Characteristics for ’FCT Family Devices
Symbol Parameter
FCT138Units
V CC
Conditions
Min Max
V IH Input HIGH Voltage 2.0
V Recognized HIGH Signal V IL Input LOW Voltage 0.8V Recognized LOW Signal V CD Input Clamp Diode Voltage ?1.2V Min I IN =?18mA V OH
Output HIGH Voltage 54FCT 4.3V
Min
I OH =?300μA 54FCT
2.4
I OH =?12mA V OL
Output LOW Voltage
54FCT 0.2V
Min
I OL =300μA 54FCT
0.5I OL =32mA I IH Input HIGH Current 5μA Max V IN =V CC I IL Input LOW Current
?5μA Max V IN =0.0V I OS Output Short-Circuit Current -60mA Max V OUT =0.0V
I CCQ Quiescent Power Supply Current 1.5mA Max V IN <0.2V or V IN 5.3V,V CC =5.5V
?I CC Quiescent Power Supply Current 2.0mA Max V I =3.4V,V CC =5.5V
I CCD
Dynamic I CC
0.4
mA/MHz
Max
Outputs Open,V CC =5.5V,V IN 5.3V or V IN <0.2V,One Bit
Toggling,50%Duty Cycle,OE =GND,LE =V CC
I CCT
Total Power Supply Current
5.5mA Max
Outputs Open,f CP =10MHz,V CC =5.5V,V IN 5.3V or V IN <0.2V,One Bit Toggling,50%Duty Cycle,OE =GND,LE =V CC
Note 2:All outputs loaded;thresholds on input associated with output under test.Note 3:Maximum test duration 2.0ms,one output loaded at a time.
54F C T 138
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54FCT138 AC Electrical Characteristics
54FCT
V CC T A=?55?C Fig.
Symbol Parameter(V)to+125?C Units No.
(Note4)C L=50pF
Min Max
t PLH Propagation Delay 5.0 1.012.0ns
A n to O n
t PHL Propagation Delay 5.0 1.012.0ns
A n to O n
t PLH Propagation Delay 5.0 1.012.5ns
E1or E2to O n
t PHL Propagation Delay 5.0 1.012.5ns
E1or E2to O n
t PLH Propagation Delay 5.0 1.012.5ns
E3to O n
t PHL Propagation Delay 5.0 1.012.5ns
E3to O n
Note4:Voltage Range5.0is5.0V±0.5V
Capacitance
Symbol Parameter Typ Units Conditions
C IN Input Capacitance 4.5pF V CC=OPEN
C P
D Power Dissipation60.0pF V CC=5.0V
Capacitance
5
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Physical Dimensions
inches (millimeters)unless otherwise noted
20Terminal Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
16Lead Ceramic Dual-In-Line Package (D)
NS Package Number J16A
54F C T 138
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Physical Dimensions inches(millimeters)unless otherwise noted(Continued)
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whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling,can be reasonably expected to result in a
significant injury to the user.
2.A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system,or to affect its
safety or effectiveness.
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16Lead Ceramic Flatpak(F)
NS Package Number W16A
54FCT138
1-of-8
Decoder/Demultiplexer National does not assume any responsibility for use of any circuitry described,no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.