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74ACT257M PDF даташит

Спецификация 74ACT257M изготовлена ​​​​«STMicroelectronics» и имеет функцию, называемую «QUAD 2 CHANNEL MULTIPLEXER 3-STATE».

Детали детали

Номер произв 74ACT257M
Описание QUAD 2 CHANNEL MULTIPLEXER 3-STATE
Производители STMicroelectronics
логотип STMicroelectronics логотип 

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74ACT257M Даташит, Описание, Даташиты
74ACT257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s HIGH SPEED: tPD =5 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 8 µA (MAX.) at TA = 25 oC
s COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN), VIL = 0.8V (MAX)
s 50TRANSMISSION LINE DRIVING
CAPABILITY
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24 mA (MIN)
s BALANCED PROPAGATION DELAYS:
tPLH tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 4.5V to 5.5V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
s IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The ACT257 is an advanced high-speed CMOS
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C2MOS technology.
It is ideal for low power applications mantaining
high speed operation similar to equivalent Bipolar
Schottky TTL.
These IC’s are composed of an independent 2
channel multiplexer with common SELECT and
PIN CONNECTION AND IEC LOGIC SYMBOLS
BM
(Plastic Package)
(Micro Package)
ORDER CODES :
74ACT257B
74ACT257M
ENABLE INPUT.
The AC257 is a non inverting multiplexer.
When the ENABLE INPUT is held ”High” outputs
of both IC’s become high impedance state. If
SELECT INPUT is held ”Low”, ”A” data is
selected, when SELECT INPUT is ”High”, ”B”
data is closen.
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOS output voltage levels.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
April 1997
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74ACT257M Даташит, Описание, Даташиты
74ACT257
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 5, 14, 11
3, 6, 13, 10
4, 7, 12, 9
15
8
16
SYMBOL
SELECT
1A to 4A
1B to 4B
1Y to 4Y
OE
GND
VCC
NAME AND FUNCTION
Common Data Select Input
Data Input From Source A
Data Inputs from Source B
3 State Multiplexer Outputs
3 State Output Enable
Inputs (Active LOW)
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
OE SELECT
HX
LL
LL
LH
LH
X = DON’T CARE Z = HIGH IMPEDANCE
INPUTS
LOGIC DIAGRAMS
A
X
L
H
X
X
OUTPUTS
BY
XZ
XL
XH
LL
HH
This logic diagram has not be used to estimate propagation delays
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74ACT257M Даташит, Описание, Даташиты
74ACT257
ABSOLUTE MAXIMUM RATINGS
Sy mb o l
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
± 200
mA
Tstg Storage Temperature
-65 to +150
oC
TL Lead Temperature (10 sec)
300 oC
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
RECOMMENDED OPERATING CONDITIONS
Sy mb o l
P a ra met er
VCC Supply Voltage
VI Input Voltage
VO Output Voltage
Top Operating Temperature:
dt/dv Input Rise and Fall Time VCC = 4.5 to 5.5V (note 1)
1) VIN from 0.8 V to 2.0 V
V alu e
4.5 to 5.5
0 to VCC
0 to VCC
-40 to +85
8
Unit
V
V
V
oC
ns/V
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