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参数资料
| 型号： | MAX379CPE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC MULTIPLEXER DUAL 4X1 16DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 25 |
| 功能： | 多路复用器 |
| 电路： | 2 x 4:1 |
| 导通状态电阻： | 3.5 千欧 |
| 电压电源： | 双电源 |
| 电压 - 电源，单路/双路(±)： | ±4.5 V ~ 18 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-PDIP |
| 包装： | 管件 |
MAX378/MAX379
High-Voltage, Fault-Protected
Analog Multiplexers
_______________________________________________________________________________________
7
Input switching, however, must be done with a fault-
protected MAX378 multiplexer, to provide the level of
protection and isolation required with most data acqui-
sition inputs. Since external signal sources may contin-
ue to supply voltage when the multiplexer and system
power are turned off, non-fault-protected multiplexers,
or even first-generation fault-protected devices, will
allow many milliamps of fault current to flow from out-
side sources into the multiplexer. This could result in
damage to either the sensors or the multiplexer. A non-
fault-protected multiplexer will also allow input overvolt-
ages to appear at its output, perhaps damaging
Sample/Holds or A/Ds. Such input overdrives may also
cause input-to-input shorts, allowing the high current
output of one sensor to possibly damage another.
The MAX378 eliminates all of the above problems. It
not only limits its output voltage to safe levels, with or
without power applied (V+ and V-), but also turns all
channels off when power is removed. This allows it to
draw only sub-microamp fault currents from the inputs,
and maintain isolation between inputs for continuous
input levels up to ±75V with power supplies off.
_______________Detailed Description
Fault Protection Circuitry
The MAX378/MAX379 are fully fault protected for contin-
uous input voltages up to ±60V, whether or not the V+
and V- power supplies are present. These devices use
a “series FET” switching scheme which not only pro-
tects the multiplexer output from overvoltage, but also
limits the input current to sub-microamp levels.
Figures 7 and 8 show how the series FET circuit pro-
tects against overvoltage conditions. When power is
off, the gates of all three FETs are at ground. With a -60V
input, N-channel FET Q1 is turned on by the +60V gate-
G
D
Q1
S
-60V
OVERVOLTAGE
N-CHANNEL MOSFET
IS TURNED ON
BECAUSE VGS = +60V
P-CHANNEL
MOSFET IS OFF
G
D
Q2
S
G
D
Q3
S
Figure 7. -60V Overvoltage with Multiplexer Power OFF
Q1
VTN = +1.5V
-15V
+15V
-15V
+13.5V
+60V
OVERVOLTAGE
N-CHANNEL MOSFET
IS TURNED ON
BECAUSE VGS = -45V
Q2
Q3
N-CHANNEL
MOSFET IS ON
+13.5V
OUTPUT
+15V FROM
DRIVERS
-15V FROM
DRIVERS
Figure 10. +60V Overvoltage Input to the ON Channel
Q1
-15V
+15V
-15V
-60V
OVERVOLTAGE
N-CHANNEL MOSFET
IS TURNED OFF
BECAUSE VGS = +45V
Q2
Q3
P-CHANNEL
MOSFET IS OFF
N-CHANNEL
MOSFET IS OFF
+60V FORCED
ON COMMON
OUTPUT
LINE BY
EXTERNAL
CIRCUITRY
-15V FROM
DRIVERS
+15V FROM
DRIVERS
Figure 9. -60V Overvoltage on an OFF Channel with
Multiplexer Power Supply ON
G
D
Q1
S
+60V
OVERVOLTAGE
N-CHANNEL MOSFET
IS TURNED OFF
BECAUSE VGS = -60V
G
D
Q2
S
G
D
Q3
S
Figure 8. +60V Overvoltage with Multiplexer Power OFF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX379CPE+ | 功能描述:多路器开关 IC 4:1 2Ch Fault-Prtct Analog MUX RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX379CWG | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX379CWG+ | 功能描述:多路器开关 IC 4:1 2Ch Fault-Prtct Analog MUX RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX379CWG+T | 功能描述:多路器开关 IC 4:1 2Ch Fault-Prtct Analog MUX RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX379CWG-T | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
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