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74VHCT257AM PDF даташит

Спецификация 74VHCT257AM изготовлена ​​​​«STMicroelectronics» и имеет функцию, называемую «QUAD 2 CHANNEL MULTIPLEXER 3-STATE».

Детали детали

Номер произв 74VHCT257AM
Описание QUAD 2 CHANNEL MULTIPLEXER 3-STATE
Производители STMicroelectronics
логотип STMicroelectronics логотип 

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74VHCT257AM Даташит, Описание, Даташиты
® 74VHCT257A
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s HIGH SPEED: tPD = 5.8 ns (TYP.) at VCC = 5V
s LOWPOWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
s COMPATIBLE WITH TTL OUTPUTS:
VIH = 2V (MIN), VIL = 0.8V (MAX)
s POWER DOWN PROTECTION ON INPUTS &
OUTPUTS
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 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
s LOWNOISE: VOLP = 0.8V (Max.)
DESCRIPTION
The 74VHCT257A 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 composed of four independent 2 channel
multiplexers with common SELECT and ENABLE
INPUT.
PRELIMINARY DATA
SOP
TSSOP
PACKAGE
SOP
TSSOP
ORDER CODES
T UB E
T&R
74VHCT257AM 74VHCT257AMTR
74VHCT257ATTR
The 74VHCT257A is a non inverting multiplexer.
When the ENABLE INPUT is held ”High”, all
outputs become high impedance state. If
SELECT INPUT is held ”Low”, ”A” data is
selected, when SELECT INPUT is ”High”, ”B”
data is chosen.
Power down protection is provided on all inputs
and output and 0 to 7V can be accepted on
inputs with no regard to the supply voltage. This
device can be used to interface 5V to 3V.
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
March 2000
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74VHCT257AM Даташит, Описание, Даташиты
74VHCT257A
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 5, 14, 11
3, 6, 13, 10
4, 7, 12, 9
15
8
16
S YM BO L
SELECT
1A to 4A
1B to 4B
1Y to 4Y
OE
GND
VCC
NAME AND FUNCTION
Common Data Select Input
Data Inputs from Source A
Data Inputs from Source B
3 State Multiplexer Outputs
3 State Output Enable
Input (Active LOW)
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
OE SELE CT
HX
LL
LL
LH
LH
X = DON’T CARE Z = HIGH IMPEDANCE
INPUT S
LOGIC DIAGRAM
A
X
L
H
X
X
OU T PU T S
BY
XZ
XL
XH
LL
HH
Thislogic diagram has notbe used to estimate propagation delays
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74VHCT257AM Даташит, Описание, Даташиты
74VHCT257A
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC Supply Voltage
-0.5 to +7.0
V
VI DC Input Voltage
-0.5 to +7.0
V
VO DC Output Voltage (see note 1)
-0.5 to +7.0
V
VO DC Output Voltage (see note 2)
-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
± 25 mA
ICC or IGND DC VCC or Ground Current
± 50 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.
1) Output in OFF State
2) High or Low State
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC Supply Voltage
VI Input Voltage
VO Output Voltage (see note 1)
VO Output Voltage (see note 2)
Top Operating Temperature
dt/dv Input Rise and Fall Time (see note 3) (VCC = 5.0 ± 0.5V)
1) Output in OFF State
2) High or Low State
3)VIN from0.8V to 2 V
Valu e
4.5 to 5.5
0 to 5.5
0 to 5.5
0 to VCC
-40 to +85
0 to 20
Unit
V
V
V
V
oC
ns/V
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