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UCC2946

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工作温度范围为 -40°C 至 +90°C、具有看门狗计时器的微处理器监控器

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UCC2946

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产品详情

Rating Catalog Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 1.235, Adjustable Features Overvoltage monitor only, Reset time delay, Timeout watchdog, Watchdog timer Reset threshold accuracy (%) 2 Iq (typ) (mA) 0.01, 0.012 Output driver type/reset output Active-low, Push-Pull Watchdog timer WDI (s) Programmable Operating temperature range (°C) -40 to 85
Rating Catalog Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 1.235, Adjustable Features Overvoltage monitor only, Reset time delay, Timeout watchdog, Watchdog timer Reset threshold accuracy (%) 2 Iq (typ) (mA) 0.01, 0.012 Output driver type/reset output Active-low, Push-Pull Watchdog timer WDI (s) Programmable Operating temperature range (°C) -40 to 85
TSSOP (PW) 8 19.2 mm² (3 mm × 6.4 mm) SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm)
  • 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
  • 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.

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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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
* 数据表 Microprocessor Supervisor with Watchdog Timer 数据表 (Rev. F) 2007-11-21

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