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54AC138 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer 54AC138
Beschreibung 1-of-8 Decoder/Demultiplexer
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 10 Seiten
54AC138 Datasheet, Funktion
www.DataSheet4U.com
August 1998
54AC138 54ACT138
1-of-8 Decoder/Demultiplexer
General Description
The ’AC/’ACT138 is a high-speed 1-of-8 decoder/
demultiplexer. This device is ideally suited for high-speed bi-
polar memory chip select address decoding. The multiple in-
put enables allow parallel expansion to a 1-of-24 decoder
using just three ’AC/’ACT138 devices or a 1-of-32 decoder
using four ’AC/’ACT138 devices and one inverter.
Features
n ICC reduced by 50%
n Demultiplexing capability
n Multiple input enable for easy expansion
n Active LOW mutually exclusive outputs
n Outputs source/sink 24 mA
n ’ACT138 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC138: 5962-87622
— ’ACT138: 5962-87554
Logic Symbols
Connection Diagrams
Pin Assignment
for DIP and Flatpak
IEEE/IEC
DS100268-1
Pin Names
A0– A2
E1– E2
E3
O0– O7
Description
Address Inputs
Enable Inputs
Enable Input
Outputs
DS100268-7
DS100268-2
Pin Assignment
for LCC
DS100268-3
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100268
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54AC138 Datasheet, Funktion
DC Characteristics for ’AC Family Devices (Continued)
Symbol
Parameter
ICC Maximum
Quiescent Supply
Current
54AC
VCC
TA =
Units
(V) −55˚C to +125˚C
Conditions
Guaranteed Limits
5.5 80.0
VIN = VCC or GND
µA
Note 2: All outputs loaded; thresholds on input associated with output under test.
Note 3: Maximum test duration 2.0 ms, one output loaded at a time.
Note 4: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC. ICC for 54AC @ 25˚C is identical to 74AC @ 25˚C.
DC Characteristics for ’ACT Family Devices
Symbol
VIH
VIL
VOH
Parameter
Minimum High
Level Input Voltage
Maximum Low
Level Input Voltage
Minimum High
Level Output
Voltage
VCC
(V)
4.5
5.5
4.5
5.5
4.5
5.5
54ACT
TA =
−55˚C to +125˚C
Guaranteed Limits
2.0
2.0
0.8
0.8
4.4
5.4
VOL Maximum Low
Level Output
Voltage
4.5
5.5
4.5
5.5
3.70
4.70
0.1
0.1
IIN
ICCT
IOLD
IOHD
ICC
Maximum Input
Leakage Current
Maximum
ICC/Input
(Note 6) Minimum
Dynamic Output
Current
Maximum
Quiescent Supply
Current
4.5
5.5
5.5
5.5
5.5
5.5
5.5
0.50
0.50
±1.0
1.6
50
−50
80.0
Note 5: All outputs loaded; thresholds on input associated with output under test.
Note 6: Maximum test duration 2.0 ms, one output loaded at a time.
Note 7: ICC for 54ACT @ 25˚C is identical to 74ACT @ 25˚C.
Units
V
V
V
V
V
V
µA
mA
mA
mA
µA
Conditions
VOUT = 0.1V
or VCC − 0.1V
VOUT = 0.1V
or VCC − 0.1V
IOUT = −50 µA
(Note 5) VIN = VIL or VIH
IOH −24 mA
−24 mA
IOUT = 50 µA
(Note 5) VIN = VIL or VIH
IOL 24 mA
24 mA
VI = VCC, GND
VI = VCC − 2.1V
VOLD = 1.65V Max
VOHD = 3.85V Min
VIN = VCC or GND
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