The TPS380x family of supervisory circuits monitor supply voltages to provide circuit initialization and timing supervision, primarily for DSPs and other processor-based systems.
These devices assert a push-pull RESET signal when the SENSE (adjustable version) or VDD (fixed version) drops below a preset threshold. The RESET output remains asserted for the factory programmed delay time after the SENSE or VDD return above its threshold.
The TPS380x devices, except the TPS3801-01, incorporate a manual reset input (MR). A low level at MR causes RESET to become active.
The TPS380x uses a precision reference to achieve an overall threshold accuracy of 2%—2.5%. These devices are available in a 5-pin SC-70 package, which is only about half the size of a 5-pin SOT-23 package.
The TPS380x devices are fully specified over a temperature range of –40°C to +85°C.
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Part number | Order | Threshold voltage 1 (Typ) (V) | Number of supplies monitored | VCC (Max) (V) | VCC (Min) (V) | Output driver type/reset output | Time delay (ms) | Features | Rating | Operating temperature range (C) | Watchdog timer WDI (sec) |
---|---|---|---|---|---|---|---|---|---|---|---|
TPS3801 |
|
Adjustable
1.71 2.25 2.64 2.93 4 4.55 |
1 | 6 | 2 |
Active-low
Push-pull |
200 |
Active-low enable
Manual reset |
Catalog | -40 to 85 | None |
TPS3800G27 |
|
2.5 | 1 | 6 | 2 |
Active-low
Push-pull |
100 |
Active-low enable
Manual reset |
Catalog | -40 to 85 | None |