UCC3946
- Fully Programmable Reset Threshold
- Fully Programmable Reset Period
- Fully Programmable Watchdog Period
- 2% Accurate Reset Threshold
- Input Voltage Down to 2 V
- Input 18-µA Maximum Input Current
- Reset Valid Down to 1 V
The UCCx946 is designed to provide accurate microprocessor supervision, including reset and watchdog functions. During power up, the device asserts a reset signal RES with VDD as low as 1 V. The reset signal remains asserted until the VDD voltage rises and remains above the reset threshold for the reset period. Both reset threshold and reset period are programmable by the user.
The UCCx946 is also resistant to glitches on the VDD line. Once RES has been deasserted, any drops below the threshold voltage need to be of certain time duration and voltage magnitude to generate a reset signal. These values are shown in Figure 1. An I/O line of the microprocessor may be tied to the watchdog input (WDI) for watchdog functions. If the I/O line is not toggled within a set watchdog period, programmable by the user, WDO is asserted. The watchdog function is disabled during reset conditions.
The UCCx946 is available in 8-pin SOIC(D), 8-pin PDIP (N) and 8-pin TSSOP(PW) packages to optimize board space.
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技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | Microprocessor Supervisor with Watchdog Timer 数据表 (Rev. F) | 2007年 11月 21日 | |||
应用手册 | 设计电压监控器的电阻分压器输入端时的 IQ与精度权衡因素 (Rev. B) | PDF | HTML | 英语版 (Rev.B) | PDF | HTML | 2021年 10月 25日 | |
选择指南 | Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) | 2020年 2月 28日 | ||||
应用手册 | Disabling the Watchdog Timer for TI's Family of Supervisors | 2003年 10月 30日 |
设计和开发
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封装 | 引脚 | 下载 |
---|---|---|
SOIC (D) | 8 | 查看选项 |
TSSOP (PW) | 8 | 查看选项 |
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