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74AC138 PDF даташит

Спецификация 74AC138 изготовлена ​​​​«STMicroelectronics» и имеет функцию, называемую «3 TO 8 LINE DECODER INVERTING».

Детали детали

Номер произв 74AC138
Описание 3 TO 8 LINE DECODER INVERTING
Производители STMicroelectronics
логотип STMicroelectronics логотип 

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74AC138 Даташит, Описание, Даташиты
74AC138
3 TO 8 LINE DECODER (INVERTING)
s HIGH SPEED: tPD = 4.5ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 4µA(MAX.) at TA=25°C
s HIGH NOISE IMMUNITY:
VNIH = VNIL = 28 % VCC (MIN.)
s 50TRANSMISSION LINE DRIVING
CAPABILITY
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24mA (MIN)
s BALANCED PROPAGATION DELAYS:
tPLH tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 138
s IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74AC138 is an advanced high-speed CMOS
3 TO 8 LINE DECODER (INVERTING) fabricated
with sub-micron silicon gate and double-layer
metal wiring C2MOS tecnology.
If the device is enabled, 3 binary select inputs (A,
B, and C) determine which one of the outputs will
go low. If enable input G1 is held low or either G2A
DIP
SOP
TSSOP
ORDER CODES
PACKAGE
DIP
SOP
TSSOP
TUBE
74AC138B
74AC138M
T&R
74AC138MTR
74AC138TTR
or G2B is held high, the decoding function is
inhibited and all the 8 outputs go to high.
Tree enable inputs are provided to ease cascade
connection and application of address decoders
for memory systems.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
April 2001
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74AC138 Даташит, Описание, Даташиты
74AC138
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3
4, 5
6
15, 14, 13,
12, 11, 10, 9,
7
8
16
SYMBOL
A, B, C
G2A, G2B
G1
Y0 to Y7
NAME AND FUNCTION
Address Inputs
Enable Inputs
Enable Input
Outputs
GND
VCC
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
ENABLE
G2B G2A
XX
XH
HX
LL
LL
LL
LL
LL
LL
LL
LL
X : Don’t Care
G1
L
X
X
H
H
H
H
H
H
H
H
C
X
X
X
L
L
L
L
H
H
H
H
SELECT
B
X
X
X
L
L
H
H
L
L
H
H
A
X
X
X
L
H
L
H
L
H
L
H
LOGIC DIAGRAM
OUTPUTS
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
HHHHHHHH
HHHHHHHH
HHHHHHHH
L HHHHHHH
H L HHHHHH
HH L HHHHH
HHH L HHHH
HHHHL HHH
HHHHH LHH
HHHHHH L H
HHHHHHH L
This logic diagram has not be used to estimate propagation delays
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74AC138 Даташит, Описание, Даташиты
74AC138
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC Supply Voltage
-0.5 to +7
V
VI DC Input Voltage
-0.5 to VCC + 0.5
V
VO DC Output Voltage
-0.5 to VCC + 0.5
V
IIK DC Input Diode Current
± 20
mA
IOK DC Output Diode Current
± 20
mA
IO DC Output Current
± 50
mA
ICC or IGND DC VCC or Ground Current
± 400
mA
Tstg Storage Temperature
-65 to +150
°C
TL Lead Temperature (10 sec)
300 °C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC Supply Voltage
VI Input Voltage
VO Output Voltage
Top Operating Temperature
dt/dv Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5V (note 1)
1) VIN from 30% to 70% of VCC
Value
2 to 6
0 to VCC
0 to VCC
-55 to 125
8
Unit
V
V
V
°C
ns/V
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