Description of the TPS3809
The TPS3809 family of supervisory circuits provides circuit initialization and timing supervision, primarily for DSPs and processor-based systems. The newer TLV809E device is an alternative with the same pins, functions, and electrical parameters.
During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the supervisory circuit 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 a proper system reset. The delay time, td(typ) = 200 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 an internal voltage divider.
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 3-pin SOT-23. The TPS3809 devices are characterized for operation over a temperature range of –40°C to 85°C.
Features for the TPS3809
- 3-pin SOT-23 package
- Supply current of 9 µA (typical)
- Precision supply voltage monitor 2.5 V, 3 V, 3.3 V, 5 V
- Pin-for-pin compatible with MAX 809
- Temperature range: –40°C to +85°C
Specifications
| Attribute | Value |
| Reset Timeout | 120ms |
| Output Type | Push Pull |
| Reset Active Level | Active Low |
| Type of the Power Management Chip | Simple reset/Power-on reset |
| Threshold Voltage | 2.93V |
| Number of Voltages Monitored | 1 |
| Operating Temperature | -40℃~+85℃@(TA) |
Applications:
- Applications Using DSPs, Microcontrollers, or Microprocessors
- Wireless Communication Systems
- Portable/Battery-Powered Equipment
- Programmable Controls
- Intelligent Instruments
- Industrial Equipment
- Notebook/Desktop Computers
- Automotive Systems
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