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The Smart Reset™ devices provide a useful feature that ensures inadvertent short reset push-button closures do not cause system resets. This is done by implementing extended Smart Reset™ input delay time (tSRC) and combined push-button inputs, which together ensures a safe reset and eliminates the need for a specific dedicated reset button.
This reset configuration provides versatility and allows the application to distinguish between a software generated interrupt and a hard system reset. When the input push-button are connected to microcontroller interrupt inputs, and are closed for a short time, the processor can only be interrupted. If the system still does not respond properly, continuing to keep the push-button closed for the extended setup time tSRCcauses a hard reset of the processor through the reset output.
The SR2 has two combined delayed Smart Reset™ inputs (SR0, SR1) with preset delayed Smart Reset™ setup time (tSRC). The reset output is asserted after both of the Smart Reset™ inputs were held active for the selected tSRCdelay time. Depending on selected option the RSToutput remains asserted either until at least one SRinput goes to inactive logic level (i.e. neither fixed nor minimum reset pulse width is set) or the output reset pulse duration is fixed for tREC(i.e. factory-programmed). The reset output, RST, is active low or active high, push-pull or open drain with optional pull-up resistor. The device fully operates over a broad VCCrange 1.65 V to 5.5 V. Below 1.575 V typ. the inputs are ignored and outputs are deasserted; the deasserted reset output levels are then valid down to 1.0 V.主要特性
- Operating voltage 1.65 V to 5.5 V
- Low supply current 1.5 μA
- Integrated test mode
- Dual Smart Reset™ push-button inputs with fixed extended reset setup delay (tSRC) from 0.5 s to 10 s in 0.5 s steps (typ.), option with internal pull-up resistor
- Push-button controlled reset pulse duration
- Option 1: fully push-button controlled, no fixed or minimum pulse width guaranteed
- Option 2: defined output reset pulse duration (tREC), factory-programmed
- No power-on reset
- Single reset output
- Active low or active high
- Push-pull or open drain with optional pull-up resistor
- Fixed Smart Reset™ input logic voltage levels
- Operating temperature: - 40 °C to +85 °C
- UDFN6 package: 1.6 mm x 1.3 mm
- ECOPACK®2 (RoHS compliant, Halogen-Free)
样片和购买
| 产品型号 | 封装 | 包装类型 | Reset pulse width (mS) (min) | Reset pulse width (mS) (max) | 温度（ºC） | 供货状态 | ECCN (US) | Country of Origin | 更多信息 | Budgetary Price (US$)*/Qty | 从ST订购 | 从分销商订购 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 最小值 | 最大值 | ||||||||||||
| SR2HARU | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Tape And Reel | 1.28 | 360 | -40 | 批量生产 | 85 | EAR99 | CHINA | 0.3 / 1k | 获取样片 | 查看供货情况 | |
| SR2LARU | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Tape And Reel | 1.28 | 360 | -40 | 批量生产 | 85 | EAR99 | CHINA | 0.3 / 1k | 获取样片 | 查看供货情况 | |
| SR2UABU | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Tape And Reel | 1.28 | 360 | -40 | 批量生产 | 85 | EAR99 | CHINA | 0.3 / 1k | 查看供货情况 | ||
| SR2UARU | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Tape And Reel | 1.28 | 360 | -40 | 批量生产 | 85 | EAR99 | CHINA | 0.3 / 1k | 获取样片 | 查看供货情况 | |
| SR2PARU | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Tape And Reel | 1.28 | 360 | -40 | 批量生产 | 85 | EAR99 | CHINA | 0.3 / 1k | 获取样片 | 查看供货情况 | |
| SR2LABU | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Tape And Reel | 1.28 | 360 | -40 | 批量生产 | 85 | EAR99 | CHINA | 0.3 / 1k | 获取样片 | 查看供货情况 | |
SR2UABU
封装
UDFN-6L 1.3X1.6 X0.55,PITCH 0.40包装类型
Tape And ReelBudgetary Price (US$)*/Qty
0.3 / 1k| 产品型号 | 供货状态 | 封装 | 等级规格 | 符合RoHS级别 | 材料声明** |
|---|---|---|---|---|---|
| SR2HARU | 批量生产 | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Industrial | Ecopack3 | |
| SR2LABU | 批量生产 | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Industrial | Ecopack3 | |
| SR2LARU | 批量生产 | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Industrial | Ecopack3 | |
| SR2PARU | 批量生产 | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Industrial | Ecopack3 | |
| SR2UABU | 批量生产 | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Industrial | Ecopack3 | |
| SR2UARU | 批量生产 | UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 | Industrial | Ecopack3 | |
SR2HARU
Package:
UDFN-6L 1.3X1.6 X0.55,PITCH 0.40Material Declaration**:
SR2LABU
Package:
UDFN-6L 1.3X1.6 X0.55,PITCH 0.40Material Declaration**:
SR2LARU
Package:
UDFN-6L 1.3X1.6 X0.55,PITCH 0.40Material Declaration**:
SR2PARU
Package:
UDFN-6L 1.3X1.6 X0.55,PITCH 0.40Material Declaration**:
SR2UARU
Package:
UDFN-6L 1.3X1.6 X0.55,PITCH 0.40Material Declaration**:
(**) st.com上提供的材料声明表单可能是基于包装系列中最常用的封装的通用文档。因此，它们可能不是100%适用于特定的设备。有关特定设备的信息，请联系 销售支持 。
