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| 型号： | MAX9644EUK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR W/REF SOT23-5 |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 通用 |
| 元件数： | 1 |
| 输出类型： | 开路漏极 |
| 电压 - 电源，单路/双路(±)： | 1 V ~ 5.5 V |
| 电流 - 输入偏压（最小值）： | 15nA |
| 电流 - 静态（最大值）： | 1.1µA |
| CMRR, PSRR（标准）： | 53dB PSRR |
| 传输延迟（最大）： | 15µs |
| 磁滞： | 0.9mV |
| 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) |
MAX9644/MAX9645/MAX9646
Low-Power Comparators with Precision
Reference in 4-Bump UCSP
_______________________________________________________________________________________
7
Detailed Description
The MAX9644/MAX9645/MAX9646 are extremely small
comparators ideal for compact, low-current, and low-
voltage applications.
The ICs consume only 400nA (typ). The low-voltage
operating capability of the operating current makes
these devices extremely attractive to long-life battery-
operated devices—these applications can now use a
single digital power-supply rail to power the new gener-
ation of microcontrollers (which can be down to 0.9V).
All parts are available in a tiny 4-bump UCSP, which is
only 0.6mm tall and occupies a 1mm x 1mm footprint
and a 5-pin SOT23.
Input Stage Circuitry
Noninverting inputs are available on the MAX9644/
MAX9646 and inverting inputs are available on the
MAX9645.
The MAX9644/MAX9645/MAX9646 incorporate an inno-
vative input stage architecture that allows their input
voltage to exceed VCC by several volts (limited only by
the
Absolute Maximum Ratings). This is unlike tradition-
al comparators that have an input ESD diode clamp
between the input and VCC, limiting this maximum over-
voltage to about 0.3V. The ICs architecture maintains a
high input impedance to input signals even when the
device power-supply voltage is completely turned off
(VCC or REF taken to 0V). This greatly benefits flexible
power-saving schemes to be easily implemented in
advanced battery-operated devices. On-chip filtering
provides immunity from any RF noise being picked up by
input traces. These devices feature an internal tempera-
ture-compensated, low-power 0.2V reference voltage.
Output Stage Structure
The MAX9644/MAX9645 have open-drain outputs that
allow them to interface to logic circuitry running from
supply voltages other than the one supplied to the part.
These devices require an external pullup resistor or
current source for proper operation. Many microcon-
troller digital inputs ports can be readily programmed to
include these.
The MAX9646 has a push-pull output stage that can
both sink and source current, eliminating the need for
an external pullup resistor. In this case, the MAX9646
uses the microcontroller’s power supply as VCC.
Applications Information
Bypassing REF/VCC
Place a 0.1F capacitor between REF or VCC and
GND as close as possible to the device. During a
switching event, all comparators draw a current spike
from their power-supply rails. This current spike is
minimized by the use of an internal break-before-make
design.
Hysteresis Operation
The ICs feature internal hysteresis for noise immunity
and glitch-free operation. If additional hysteresis is
needed, an external positive feedback network can be
easily implemented on the MAX9644 and MAX9646 non-
inverting input devices. Additional external hysteresis is
not possible on the MAX9645 because the noninverting
input of the comparator is not externally accessible.
PART
INPUT VOLTAGE CONDITIONS
ACTION AT OUTPUT
VIN > 0.2V
External pullup resistor pulls output high.
MAX9644
VIN < 0.2V
Output asserts low.
VIN > 0.2V
Output asserts low.
MAX9645
VIN < 0.2V
External pullup resistor pulls output high.
VIN > 0.2V
Output asserts high.
MAX9646
VIN < 0.2V
Output asserts low.
Table 1. How Devices Behave Under Various Input Voltage Conditions
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9644EVKIT# | 功能描述:其他开发工具 MAX9644 Eval Kit RoHS:否 制造商:Parallax 产品:ELEV-8 Hex Upgrade Kits 类型:Robotics 工具用于评估:ELEV-8 Quadcopter 工作电源电压: |
| MAX9644EVKIT+ | 功能描述:其他开发工具 MAX9644 Eval Kit RoHS:否 制造商:Parallax 产品:ELEV-8 Hex Upgrade Kits 类型:Robotics 工具用于评估:ELEV-8 Quadcopter 工作电源电压: |
| MAX9645EBS+TG45 | 功能描述:校验器 IC Low-Power 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 |
| MAX9645EUK+T | 功能描述:校验器 IC Low-Power 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 |
| MAX9645EVKIT# | 功能描述:其他开发工具 MAX9645 Eval Kit RoHS:否 制造商:Parallax 产品:ELEV-8 Hex Upgrade Kits 类型:Robotics 工具用于评估:ELEV-8 Quadcopter 工作电源电压: |
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