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MAX354CWE+ Datasheet

  • MAX354CWE+

  • IC MULTIPLEXER 8X1 16SOIC

  • 130.10KB

  • 12頁(yè)

  • Maxim   Maxim

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Fault-Protected Analog Multiplexers
MAX354/MAX355
_________________________________Test Circuits/Timing Diagrams (continued)
+15V
10nF
+15V
10nF
V
IN
R
S
= 50鈩?/div>
NO1
NO8
V+
R = 1k鈩?/div>
V
IN
NO1
NO2
NO8
COM
R
L
1k
V
OUT
A0
R
G
= 50鈩?/div>
A1
A2
V+
MAX354
A0
A1
A2
GND EN
10nF
-15V
OFF ISOLATION = 20log
V
OUT
V
IN
V-
MAX354
COM
R
L
1k
V
OUT
GND EN
10nF
V-
-15V
CROSSTALK = 20log
V
OUT
V
IN
Figure 5. Off Isolation
Figure 6. Crosstalk
+15V
A2
CHANNEL
SELECT
A1
A0
GND
EN
V-
V+
NO1
NO8
COM
f = 1MHz
1MHz
CAPACITANCE
ANALYZER
MAX354
-15V
Figure 7. NO/COM Capacitance
_______________Detailed Description
Fault-Protection Circuitry
Maxim鈥檚 MAX354/MAX355 are fully fault protected for
continuous input voltages up to 鹵40V, whether or not
the V+ and V- power supplies are present. These
devices use a 鈥渟eries FET鈥?protection scheme that not
only protects the multiplexer output from overvoltage,
but also limits the input current to sub-microamp levels.
When signal voltages exceed or are within approxi-
mately 1.5V of the supply rails, on-resistance increas-
es. This greater on-resistance limits fault currents and
output voltage, protecting sensitive circuits and com-
ponents. The protected output clamps at approximately
1.5V below the supply rails and maintains the correct
polarity. There are no glitches or polarity reversals
going into or coming out of a fault condition.
Figures 8 and 9 show how the series FET circuit protects
against overvoltage conditions. When power is off, the
gates of all three FETs are at ground. With a -25V input,
N-channel FET Q1 is turned on by the +25V gate-to-
source voltage. The P-channel device (Q2), however,
has +25V V
GS
and is turned off, thereby preventing the
input signal from reaching the output. If the input volt-
age is +25V, Q1 has a negative V
GS
, which turns it off.
Similarly, only sub-microamp leakage currents can flow
from the output back to the input, since any voltage will
turn off either Q1 or Q2.
8
_______________________________________________________________________________________

MAX354CWE+ 產(chǎn)品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 46

  • 集成電路 (IC)

  • 接口 - 模擬開(kāi)關(guān)，多路復(fù)用器，多路分解器

  • -

  • 多路復(fù)用器

  • 1 x 8:1

  • 350 歐姆

  • 單/雙電源

  • 4.5 V ~ 36 V，±4.5 V ~ 18 V

  • -

  • 0°C ~ 70°C

  • 表面貼裝

  • 16-SOIC（0.295"，7.50mm 寬）

  • 16-SOIC W

  • 管件

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