The TPS386596 device monitors four power rails and asserts the RESET signal when any of the SENSE inputs drop below the respective thresholds. SVS-1 can be used to monitor a 3.3-V nominal power supply with no external components required. SVS-2, SVS-3, and SVS-4 are adjustable using external resistors and can be used to monitor any power-supply voltage higher than 0.4 V. All SENSE inputs have a threshold accuracy of 0.25% (typical). The TPS386596L33 also has an active-low manual reset (MR) that can assert the RESET signal as desired by the application. The open-drain, active-low RESET output deasserts after a fixed 50-ms delay.
The TPS386596 has a low quiescent current of 7 µA (typical) and is available in a space-saving, 8-pin MSOP package.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS386596 | VSSOP (8) | 5.00 mm × 3.00 mm |
Changes from * Revision (July 2010) to A Revision
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | NO. | |||
GND | 5 | — | Ground | |
MR | 7 | I | Manual reset input with internal 100-kΩ pullup to VDD and 50-ns deglitch. Logic low level of this pin asserts RESET. | |
RESET | 6 | O | RESET is an open-drain output pin. When RESET is asserted, this pin remains in a low-impedance state. When RESET is deasserted, this pin goes to a high-impedance state after 50 ms. A pullup resistor to VDD or another voltage source is required. | |
SENSE1 | 4 | I | Monitor voltage input for Supply 1 | When the voltage at this terminal drops the threshold voltage (VIT1= 2.9 V), RESET is asserted. |
SENSE2 | 3 | I | Monitor voltage input for Supply 2 | When the voltage at this terminal drops the threshold voltage (VIT2= 0.4 V), RESET is asserted. |
SENSE3 | 2 | I | Monitor voltage input for Supply 3 | When the voltage at this terminal drops the threshold voltage (VIT3= 0.4 V), RESET is asserted. |
SENSE4 | 1 | I | Monitor voltage input for Supply 4 | When the voltage at this terminal drops the threshold voltage (VIT4= 0.4 V), RESET is asserted. |
VDD | 8 | I | Supply voltage. Connecting a 0.1-µF ceramic capacitor close to this pin is recommended. |