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부품번호 | 74138 기능 |
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기능 | LOW POWER SCHOTTKY | ||
제조업체 | ON Semiconductor | ||
로고 | |||
전체 8 페이지수
SN74LS138
1-of-8 Decoder/
Demultiplexer
The LSTTL / MSI SN74LS138 is a high speed 1-of-8 Decoder /
Demultiplexer. This device is ideally suited for high speed bipolar
memory chip select address decoding. The multiple input enables
allow parallel expansion to a 1-of-24 decoder using just three LS138
devices or to a 1-of-32 decoder using four LS138s and one inverter.
The LS138 is fabricated with the Schottky barrier diode process for
high speed and is completely compatible with all ON Semiconductor
TTL families.
• Demultiplexing Capability
• Multiple Input Enable for Easy Expansion
• Typical Power Dissipation of 32 mW
• Active Low Mutually Exclusive Outputs
• 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
SN74LS138N 16 Pin DIP 2000 Units/Box
SN74LS138D
16 Pin
2500/Tape & Reel
© Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1
Publication Order Number:
SN74LS138/D
SN74LS138
FUNCTIONAL DESCRIPTION
The LS138 is a high speed 1-of-8 Decoder/Demultiplexer
fabricated with the low power Schottky barrier diode
process. The decoder accepts three binary weighted inputs
(A0, A1, A2) and when enabled provides eight mutually
exclusive active LOW Outputs (O0 – O7). The LS138
features three Enable inputs, two active LOW (E1, E2) and
one active HIGH (E3). All outputs will be HIGH unless E1
and E2 are LOW and E3 is HIGH. This multiple enable
function allows easy parallel expansion of the device to a
1-of-32 (5 lines to 32 lines) decoder with just four LS138s
and one inverter. (See Figure a.)
The LS138 can be used as an 8-output demultiplexer by
using one of the active LOW Enable inputs as the data input
and the other Enable inputs as strobes. The Enable inputs
which are not used must be permanently tied to their
appropriate active HIGH or active LOW state.
INPUTS
TRUTH TABLE
OUTPUTS
E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6
HXXXXXHHHHHHH
XHXXXXHHHHHHH
XX L XXXHHHHHHH
L LHL L L LHHHHHH
L LHHL LHLHHHHH
L LHLHLHHLHHHH
L LHHHLHHHLHHH
L LHL LHHHHHLHH
L LHHLHHHHHHLH
L LHLHHHHHHHHL
L LHHHHHHHHHHH
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
O7
H
H
H
H
H
H
H
H
H
H
L
A0
A1
A2
A3
A4
H
123
A0 A1 A2
E
LS138
O0 O1 O2 O3 O4 O5 O6 O7
123
A0 A1 A2
E
LS138
O0 O1 O2 O3 O4 O5 O6 O7
123
A0 A1 A2
E
LS138
O0 O1 O2 O3 O4 O5 O6 O7
LS04
123
A0 A1 A2
E
LS138
O0 O1 O2 O3 O4 O5 O6 O7
O0
Figure a
O31
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4
4페이지 SN74LS138
PACKAGE DIMENSIONS
–A–
16
1
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
9
–B– P 8 PL
8 0.25 (0.010) M B S
G
–T– SEATING
PLANE
K
C
D 16 PL
0.25 (0.010) M T B S A S
R X 45_
F
MJ
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
MILLIMETERS
INCHES
DIM MIN MAX MIN MAX
A 9.80 10.00 0.386 0.393
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049
G 1.27 BSC
0.050 BSC
J 0.19 0.25 0.008 0.009
K 0.10 0.25 0.004 0.009
M 0_ 7_ 0_ 7_
P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019
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7
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
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