STMicroelectronics SR2开关IC

STMicroelectronics SR2开关IC提供一个有用的特性，即确保无意间的短暂复位按钮闭合不会造成系统复位。这是通过执行延长的智能复位输入延迟时间（t_SRC）和组合按钮输入来实现的，它们一起确保安全复位，省去一个具体的专用复位按钮。SR2有两个组合的延迟智能复位输入（SR0、SR1），可预置延迟的智能复位设定时间（t_SRC)。两个智能复位输入保持有效状态选定的t_SRC 延迟时间后，复位输出（RST）被置为有效。根据选择的选项不同，RST输出保持被置为有效状态直至至少一个SR输入进入无效逻辑电平（即固定和最小复位脉冲宽度都未设定）或者输出复位脉冲持续时间保持固定一段长为t_REC 的时间（即出厂设置）。复位输出RST是低电平有效或高电平有效、推挽式或开漏式，带有可选的上拉电阻器。该器件可工作于宽幅的V_CC 范围：从1.65V到5.5V。在1.575V典型值下输入被忽略，输出被置为无效；然后被置为无效的复位输出电平有效并降至1.0 V。

The SR2 has two combined delayed Smart Reset inputs (SR0, SR1) with preset delayed Smart Reset setup time (t_SRC). The reset output is asserted after both of the Smart Reset inputs were held active for the selected t_SRC delay time. Depending on selected option the RST output remains asserted either until at least one SR input goes to inactive logic level or the output reset pulse duration is fixed for t_REC. 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 V_CC range 1.65V to 5.5V. Below 1.575V the inputs are ignored and outputs are deasserted; the deasserted reset output levels are then valid down to 1.0V.

The STMicroelectronics SR2 6-Pin Smart Reset Switch is offered in a 1.6mm x 1.3mm UDFN6 package.

特性

1.65V to 5.5V operating voltage
Low 1.5µA supply current
Integrated test mode
Dual Smart Reset push-button inputs with fixed extended reset setup delay (t_SRC) from 0.5s to 10s in 0.5s 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 (t_REC), 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
-40°C to +85°C operating temperature
1.6mm x 1.3mm UDFN6 package
ECOPACK2 (RoHS compliant, Halogen-Free)