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| 型号： | MAX9140EUK-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/15页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR SGL R-R LP SOT23-5 |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 通用 |
| 元件数： | 1 |
| 输出类型： | CMOS，推挽式，TTL |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.5 V |
| 电压 - 输入偏移（最小值）： | 2mV @ 5V |
| 电流 - 输入偏压（最小值）： | 0.32µA @ 5V |
| 电流 - 静态（最大值）： | 300µA |
| CMRR, PSRR（标准）： | 81.94dB CMRR，81.94dB PSRR |
| 传输延迟（最大）： | 40ns |
| 磁滞： | 1.5mV |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | SC-74A，SOT-753 |
| 安装类型： | 表面贴装 |
| 包装： | 带卷 (TR) |
Detailed Description
The MAX9140/MAX9141/MAX9142/MAX9144 single-
supply comparators feature internal hysteresis, high
speed, and low power. Their outputs are pulled to with-
in 300mV of either supply rail without external pullup or
pulldown circuitry. Rail-to-rail input voltage range and
low-voltage single-supply operation make these
devices
ideal
for
portable
equipment.
The
MAX9140/MAX9141/MAX9142/MAX9144 interface
directly to CMOS and TTL logic.
Most high-speed comparators oscillate in the linear
region because of noise or undesired parasitic feed-
back. This tends to occur when the voltage on one
input is at or equal to the voltage on the other input. To
counter the parasitic effects and noise, the MAX9140/
MAX9141/MAX9142/MAX9144 have an internal hystere-
sis of 1.5mV.
The hysteresis in a comparator creates two trip points:
one for the rising input voltage and one for the falling
input voltage (Figure 1). The difference between the trip
points is the hysteresis. The average of the trip points is
the offset voltage. When the comparator’s input volt-
ages are equal, the hysteresis effectively causes one
comparator input voltage to move quickly past the
other, thus taking the input out of the region where
oscillation occurs. Standard comparators require hys-
teresis to be added with external resistors. The
MAX9140/MAX9141/MAX9142/MAX9144’s fixed internal
hysteresis eliminates these resistors. To increase hys-
teresis and noise margin even more, add positive feed-
back with two resistors as a voltage divider from the
output to the noninverting input.
Figure 1 illustrates the case where IN- is fixed and IN+
is varied. If the inputs were reversed, the figure would
look the same, except the output would be inverted.
The MAX9141 includes an internal latch that allows
storage of comparison results. The L
—
E pin has a high
input impedance. If L
—
E is high, the latch is transparent
(i.e., the comparator operates as though the latch is not
present). The comparator's output state is latched
when L
—
E is pulled low (Figure 2).
Shutdown Mode (MAX9141 Only)
The MAX9141 shuts down when the
–
S
—
H
—
D
—
N
–
pin is low.
When shut down, the supply current drops to less than
12A, and the three-state output becomes high imped-
ance. The
–
S
—
H
—
D
—
N
–
pin has a high-input impedance.
Connect S
—
H
—
D
—
N
–
to VCC for normal operation. Exit shut-
down with L
—
E
high (transparent state); otherwise, the
output will be indeterminate.
Input Stage Circuitry
The MAX9140/MAX9141/MAX9142/MAX9144 include
internal protection circuitry that prevents damage to the
precision input stage from large differential input volt-
ages. This protection circuitry consists of two back-to-
back diodes between IN+ and IN- as well as two series
4.1k resistors (Figure 3). The diodes limit the differen-
tial voltage applied to the internal circuitry of the com-
parators to be no more than 2VF, where VF is the for-
ward voltage drop of the diode (about 0.7V at +25°C).
For a large differential input voltage (exceeding 2VF),
this protection circuitry increases the input bias current
at IN+ (source) and IN- (sink).
Input Current =
(IN+ - IN-) - 2VF
2 x 4.1k
Input current with large differential input voltages
should not be confused with input bias current (IB). As
long as the differential input voltage is less than 2VF,
this input current is equal to IB. The output is in the cor-
rect logic state if one or both inputs are within the com-
mon-mode range.
MAX9140/MAX9141/MAX9142/MAX9144
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
_______________________________________________________________________________________
7
VTRIP+
VHYST
VTRIP-
COMPARATOR
OUTPUT
VOH
VOL
VTRIP+ + VTRIP-
2
VOS =
VIN- = 0
VIN+
Figure 1. Input and Output Waveform, Noninverting Input
Varied
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9140EXK | 制造商:Maxim Integrated Products 功能描述:LOW-POWER, 3V/5V, RAIL-TO-RAIL COMPARATORS - Rail/Tube |
| MAX9140EXK+ | 制造商:Maxim Integrated Products 功能描述:COMPARATOR SGL R-R I/P 5.5V 5PIN SC-70 - Bulk |
| MAX9140EXK+T | 功能描述:校验器 IC 40ns Low-Power 3V/5V Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX9140EXK-T | 功能描述:校验器 IC 40ns Low-Power 3V/5V Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX9140-MAX9144 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators |
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