The TPS382x family of supervisors provides circuit initialization and timing supervision, primarily for DSP and processor-based systems.

During power-on, RESET\ is asserted when supply voltage VDD becomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors VDD and keeps RESET\ active as long as VDD remains below the threshold voltage VIT–. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, td, starts after VDD has risen above the threshold voltage VIT–. When the supply voltage drops below the threshold voltage VIT–, the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage VIT– set by an internal voltage divider.

The TPS3820/3/5/8 devices incorporate a manual reset input, MR\. A low level at MR\ causes RESET\ to become active. The TPS3824/5 devices include a high-level output RESET. TPS3820/3/4/8 have a watchdog timer that is periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval, ttout, RESET\ becomes active for the time period td. This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog.

In applications where the input to the WDI pin may be active (transitioning high and low) when the TPS3820/3/4/8 is asserting RESET\, the TPS3820/3/4/8 does not return to a non-reset state when the input voltage is above Vt. If the application requires that input to WDI is active when RESET\ is asserted, WDI must be decoupled from the active signal. This can be accomplished by using an N-channel FET in series with the WDI pin, with the gate of the FET connected to the RESET\ output as shown in Figure 1.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in a 5-pin SOT23-5 package. The TPS382x-xxQ-Q1 devices are characterized for operation over a temperature range of –40°C to 125°C, and are qualified in accordance with AEC-Q100 stress test qualification for integrated circuits.

• Qualified for Automotive Applications
• ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Using Human Body Model(C = 100 pF, R = 1500 )
• Power-On Reset Generator With Fixed Delay Time of 200 ms (TPS3823/4/5/8) or 25 ms (TPS3820)
• Manual Reset Input (TPS3820/3/5/8)
• Reset Output Available in Active-Low (TPS3820/3/4/5), Active-High (TPS3824) and Open-Drain (TPS3828)
• Supply Voltage Supervision Range 2.5 V, 3 V, 3.3 V, 5 V
• Watchdog Timer (TPS3820/3/4/8)
• Supply Current of 15 µA (Typ)
• SOT23-5 Package
• Applications
  • Applications Using Automotive DSPs, Microcontrollers, or Microprocessors
  • Industrial Equipment
  • Programmable Controls
  • Automotive Systems
  • Battery-Powered Equipment
  • Intelligent Instruments
  • Wireless Communications Systems

• PCM2705C - 具有线路输出和 S/PDIF 输出、总线供电/自供电的 98dB SNR 立体声全速 DAC（S/W 控制）
• UCC1806 - 低功耗、双路输出、电流模式 PWM 控制器
• TMS320F28068M - 具有 InstaSPIN-MOTION 的 Piccolo 微控制器
• CD74HCT03 - 具有漏极开路的高速 CMOS 逻辑四路 2 输入与非门
• MSP430FR5972 - MSP430FR597x(1)、MSP430FR5 87x(1) 混合信号微控制器
• ADC101C021 - 具有警报引脚的 I2C 兼容、10 位模数转换器 (ADC)
• TXS4558 - 双 SIM 卡电源，配备电平转换器和专用双路 LDO
• DAC5672 - 数模转换器
• SN74ABT162823A - 具有三态输出的 18 位总线接口触发器
• TPS61222-EP - 增强型产品，具有 5.5μA 静态电流的低输入电压、0.7V 升压转换器