TPS3128E18 - 采用 5/SOT23 封装且具有看门狗和 /MR 的单通道 (1.8V) SVS

TPS3128E18是TI德州仪器公司的一款无产品，TPS3128E18是采用 5/SOT23 封装且具有看门狗和 /MR 的单通道 (1.8V) SVS，本站介绍了TPS3128E18的封装应用图解、特点和优点、功能等，并给出了与TPS3128E18相关的TI元器件型号供参考。

TPS3128E18 - 采用 5/SOT23 封装且具有看门狗和 /MR 的单通道 (1.8V) SVS - 无 - 监控器和复位IC - 德州仪器

产品描述

The TPS312x family of ultralow voltage processor supervisory circuits provides circuit initialization and timing supervision, primarily for DSP and processor-based systems.

During power-on, RESET is asserted when the supply voltage (VDD) becomes higher than 0.75 V. Thereafter, the supply voltage supervisor monitors VDD and keeps RESET output 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 = 180 ms, 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 a high precision internal voltage divider.

The TPS3123/5/6/8 devices incorporate a manual reset input, MR. A low level at MR causes RESET to become active. The TPS3124 devices do not have the input MR, but include a high-level output RESET same as the TPS3125 and TPS3126 devices. In addition, the TPS3123/4/8 have a watchdog timer that needs to be triggered periodically by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval ttout= 0.8 s, RESET output becomes active for the time period (td). This event also reinitializes the watchdog timer.

The circuits are available in a 5-pin SOT23-5 package. The TPS312x devices are characterized for operation over a temperature range of –40°C to +85°C.

产品特性

Minimum Supply Voltage of 0.75 V
Supply Voltage Supervision Range:
- 1.2 V, 1.5 V, 1.8 V (TPS312x)
- 3 V (TPS3125 Devices Only)
- Other Versions on Request
Power-On Reset Generator With Fixed Delay Time of 180 ms
Manual Reset Input (TPS3123/5/6/8)
Watchdog Timer Retriggers the RESET Output at VDD ≥ VIT
Supply Current of 14 µA (Typ)
Small SOT23-5 Package
Temperature Range of –40°C to +85°C
Reset Output Available in Push-Pull (Active Low and High) and Open-Drain (Active-Low)

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