74LS42 PDF даташит
Спецификация 74LS42 изготовлена «ON Semiconductor» и имеет функцию, называемую «BCD to Decimal Decoder / Driver». |
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Детали детали
Номер произв | 74LS42 |
Описание | BCD to Decimal Decoder / Driver |
Производители | ON Semiconductor |
логотип |
8 Pages
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SN74LS42
One-of-Ten Decoder
The LSTTL / MSI SN74LS42 is a Multipurpose Decoder designed
to accept four BCD inputs and provide ten mutually exclusive outputs.
The LS42 is fabricated with the Schottky barrier diode process for
high speed and is completely compatible with all ON Semiconductor
TTL families.
• Multifunction Capability
• Mutually Exclusive Outputs
• Demultiplexing Capability
• Input Clamp Diodes Limit High Speed Termination Effects
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min Typ Max Unit
VCC Supply Voltage
TA Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0 25 70 °C
IOH Output Current – High
IOL Output Current – Low
– 0.4
8.0
mA
mA
http://onsemi.com
LOW
POWER
SCHOTTKY
16
1
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
Package
Shipping
SN74LS42N
16 Pin DIP
2000 Units/Box
SN74LS42D
16 Pin
2500/Tape & Reel
© Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1
Publication Order Number:
SN74LS42/D
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SN74LS42
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC A0 A1 A2 A3 9
16 15 14 13 12 11
1 2 3 4 56
0 1 2 3 45
87
10 9
78
6 GND
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram)
as the Dual In-Line
Package.
PIN NAMES
A0 – A3
0 to 9
Address Inputs
Outputs, Active LOW
LOADING (Note a)
HIGH
LOW
0.5 U.L.
10 U.L.
0.25 U.L.
5 U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.
LOGIC SYMBOL
15 14 13 12
A0 A1 A2 A3
012345 6 7 89
1 2 3 4 5 6 7 9 10 11
VCC = PIN 16
GND = PIN 8
A0
15
LOGIC DIAGRAM
A1
14
A2
13
A3
12
12
3 4 5 6 7 9 10 11
0 1 2 3 4 56 7 89
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
http://onsemi.com
2
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SN74LS42
FUNCTIONAL DESCRIPTION
The LS42 decoder accepts four active HIGH BCD inputs
and provides ten mutually exclusive active LOW outputs, as
shown by logic symbol or diagram. The active LOW outputs
facilitate addressing other MSI units with LOW input
enables.
The logic design of the LS42 ensures that all outputs
are HIGH when binary codes greater than nine are applied
to the inputs.
The most significant input A3 produces a useful inhibit
function when the LS42 is used as a one-of-eight decoder.
The A3 input can also be used as the Data input in an 8-output
demultiplexer application.
TRUTH TABLE
A0 A1 A2 A3 0 1 2 3 4 5 6 7 8 9
L L L L LHHHHHHHHH
H L L L HLHHHHHHHH
L H L L HHLHHHHHHH
H H L L HHHLHHHHHH
L L H L HHHHLHHHHH
H L H L HHHHHLHHHH
L H H L HHHHHHLHHH
H H H L HHHHHHHLHH
L L L H HHHHHHHHLH
H L L H HHHHHHHHHL
L H L H HHHHHHHHHH
H H L H HHHHHHHHHH
L L H H HHHHHHHHHH
H L H H HHHHHHHHHH
L H H H HHHHHHHHHH
H H H H HHHHHHHHHH
H = HIGH Voltage Level
L = LOW Voltage Level
http://onsemi.com
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