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74VHC257M の電気的特性と機能

74VHC257MのメーカーはSTMicroelectronicsです、この部品の機能は「QUAD 2 CHANNEL MULTIPLEXER 3-STATE」です。


製品の詳細 ( Datasheet PDF )

部品番号 74VHC257M
部品説明 QUAD 2 CHANNEL MULTIPLEXER 3-STATE
メーカ STMicroelectronics
ロゴ STMicroelectronics ロゴ 




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74VHC257M Datasheet, 74VHC257M PDF,ピン配置, 機能
® 74VHC257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s HIGH SPEED: tPD = 3.7 ns (TYP.) at VCC = 5V
s LOWPOWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
s HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
s POWER DOWN PROTECTION ON INPUTS
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
s BALANCED PROPAGATION DELAYS:
tPLH tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V 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 74VHC257 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.
M
(Micro Package)
T
(TSSOP Package)
ORDER CODES :
74VHC257M
74VHC257T
The 74VHC257 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 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
June 1999
1/9

1 Page





74VHC257M pdf, ピン配列
74VHC257
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
-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.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC Supply Voltage
VI Input Voltage
VO Output Voltage
Top Operating Temperature
dt/dv Input Rise and Fall Time (see note 1) (VCC = 3.3 ± 0.3V)
(V CC = 5.0 ± 0.5V)
1) VIN from 30% to70%of VCC
Valu e
2.0 to 5.5
0 to 5.5
0 to VCC
-40 to +85
0 to 100
0 to 20
Unit
V
V
V
oC
ns/V
ns/V
DC SPECIFICATIONS
Symb ol
Parameter
VIH High Level Input
Voltage
VIL Low Level Input
Voltage
VOH High Level Output
Voltage
VOL Low Level Output
Voltage
IOZ High Impedance
Output Leakage
Current
II Input Leakage Current
ICC Quiescent Supply
Current
Test Conditions
V CC
( V)
2 .0
3.0 to 5.5
2.0
3.0 to 5.5
2.0
3.0
4.5
3.0
4.5
2.0
3.0
4 .5
3.0
4.5
5 .5
IO=-50 µA
IO=-50 µA
IO=-50 µA
IO=-4 mA
IO=-8 mA
IO=50 µA
IO=50 µA
IO=50 µA
IO=4 mA
IO=8 mA
VI = VIH or VIL
VO = VCC or GND
0 to 5.5
5.5
VI = 5.5V or GND
VI = VCC or GND
Value
TA = 25 oC
-40 to 85 oC
Min. Typ . Max. Min . Max.
1.5 1.5
0.7VCC
0.7VCC
0.5 0.5
0.3VCC
0.3VCC
1.9 2.0
1.9
2.9 3.0
2.9
4.4 4.5
4.4
2.58 2.48
3.94 3.8
0.0 0.1
0.1
0.0 0.1
0.1
0.0 0.1
0.1
0.36 0.44
0.36 0.44
±0.25
±2.5
±0.1
4
±1.0
40
Un it
V
V
V
V
µA
µA
µA
3/9


3Pages


74VHC257M 電子部品, 半導体
74VHC257
WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS (f=1MHz; 50% duty
cycle)
WAVEFORM 3: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
6/9

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
74VHC257

QUAD 2 CHANNEL MULTIPLEXER 3-STATE

STMicroelectronics
STMicroelectronics
74VHC257M

QUAD 2 CHANNEL MULTIPLEXER 3-STATE

STMicroelectronics
STMicroelectronics
74VHC257T

QUAD 2 CHANNEL MULTIPLEXER 3-STATE

STMicroelectronics
STMicroelectronics


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