Texas Instruments

The TPS3600 family of supervisory circuits monitor and control processor activity. In case of power-fail or brownout conditions, the backup-battery switchover function of TPS3600 allows to run a low-power processor and its peripherals from the installed backup battery without asserting a reset beforehand. During power on,RESETis asserted when the supply voltage (VDDor VBAT) becomes higher than Vres. Thereafter, the supply voltage supervisor monitors VOUTand keepsRESEToutput active as long as VOUTremains below the threshold voltage (VIT). An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. This delay timer starts its time-out, after VOUThas risen above the threshold voltage (VIT). In case of a brownout or power failure of both supply sources, a voltage drop below the threshold voltage (VIT) get detected and the output becomes active (low) again. The product spectrum is designed for supply voltages of 2 V, 2.5 V, 3.3 V, and 5 V. The circuits are available in a 14-pin TSSOP package. They are characterized for operation over a temperature range of -40°C to 85°C. The TPS3600 family of supervisory circuits monitor and control processor activity. In case of power-fail or brownout conditions, the backup-battery switchover function of TPS3600 allows to run a low-power processor and its peripherals from the installed backup battery without asserting a reset beforehand. During power on,RESETis asserted when the supply voltage (VDDor VBAT) becomes higher than Vres. Thereafter, the supply voltage supervisor monitors VOUTand keepsRESEToutput active as long as VOUTremains below the threshold voltage (VIT). An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. This delay timer starts its time-out, after VOUThas risen above the threshold voltage (VIT). In case of a brownout or power failure of both supply sources, a voltage drop below the threshold voltage (VIT) get detected and the output becomes active (low) again. The product spectrum is designed for supply voltages of 2 V, 2.5 V, 3.3 V, and 5 V. The circuits are available in a 14-pin TSSOP package. They are characterized for operation over a temperature range of -40°C to 85°C.

The TPS3606-33 supervisory circuit monitors and controls the processor activity. In case of power-fail or brownout conditions, the backup-battery switchover function of the TPS3606-33 allows a low-power processor and its peripherals to run from the installed backup battery without asserting a reset beforehand. During power on,RESETis asserted when the supply voltage (VDDor VBAT) becomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors VOUTand keeps theRESEToutput active as long as VOUTremains 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 starts after VOUThas risen above VIT. When the supply voltage drops below VIT, the output becomes active (low) again. The TPS3606-33 is available in a 10-pin MSOP package and is characterized for operation over a temperature range of –40°C to 85°C. The TPS3606-33 supervisory circuit monitors and controls the processor activity. In case of power-fail or brownout conditions, the backup-battery switchover function of the TPS3606-33 allows a low-power processor and its peripherals to run from the installed backup battery without asserting a reset beforehand. During power on,RESETis asserted when the supply voltage (VDDor VBAT) becomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors VOUTand keeps theRESEToutput active as long as VOUTremains 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 starts after VOUThas risen above VIT. When the supply voltage drops below VIT, the output becomes active (low) again. The TPS3606-33 is available in a 10-pin MSOP package and is characterized for operation over a temperature range of –40°C to 85°C.

The TPS3613-01 supervisory circuit monitors and controls processor activity by providing backup-battery switchover for data retention of CMOS RAM. During power-on, reset (RESET andRESET) is asserted when the supply voltage (VDDor VBAT) becomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors VDDat the SENSE pin through external feedback resistors and keeps reset active as long as SENSE remains below the threshold voltage, VIT. An internal timer delays the release of the reset state to ensure proper system reset. The delay time starts after SENSE rises above the threshold voltage, VIT. When SENSE drops below VIT, reset becomes active again. The TPS3613-01 is available in a 10-pin MSOP package and is characterized for operation over a temperature range of –40°C to +85°C. The TPS3613-01 supervisory circuit monitors and controls processor activity by providing backup-battery switchover for data retention of CMOS RAM. During power-on, reset (RESET andRESET) is asserted when the supply voltage (VDDor VBAT) becomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors VDDat the SENSE pin through external feedback resistors and keeps reset active as long as SENSE remains below the threshold voltage, VIT. An internal timer delays the release of the reset state to ensure proper system reset. The delay time starts after SENSE rises above the threshold voltage, VIT. When SENSE drops below VIT, reset becomes active again. The TPS3613-01 is available in a 10-pin MSOP package and is characterized for operation over a temperature range of –40°C to +85°C.

The TPS3617 and TPS3618 are battery-backup supervisors that monitor 5 V supplies. They provide a battery-backup function ideal for applications that require data retention of CMOS RAM during fault conditions. When the voltage at VDDdrops below a preset threshold (VIT), the active low push-pullRESEToutput asserts, and VOUTswitches from VDDto VBAT. When VDDrises above the trip threshold, VOUTswitches immediately from VBATto VDD. TheRESEToutput remains low until the delay time (td) expires. During power on,RESETis asserted when the supply voltage (VDDor VBAT) goes higher than 1.1 V. The PFI andPFOpins are provided if additional voltage monitoring is needed. If the voltage at PFI is less than 1.15 V, the push-pullPFOpin will assert low. When the voltage at PFI exceeds the threshold voltage,PFOwill go high. These devices also feature a watchdog timer pin (WDI) that monitors processor activity and assertsRESETif the the processor is inactive longer than the watchdog timeout period. If the watchdog timer is not used, the WDI pin should be left floating. The TPS3617 and TPS3618 are available in an 8-pin MSOP package and are characterized for operation over a temperature range of -40°C to +85°C. The TPS3617 and TPS3618 are battery-backup supervisors that monitor 5 V supplies. They provide a battery-backup function ideal for applications that require data retention of CMOS RAM during fault conditions. When the voltage at VDDdrops below a preset threshold (VIT), the active low push-pullRESEToutput asserts, and VOUTswitches from VDDto VBAT. When VDDrises above the trip threshold, VOUTswitches immediately from VBATto VDD. TheRESEToutput remains low until the delay time (td) expires. During power on,RESETis asserted when the supply voltage (VDDor VBAT) goes higher than 1.1 V. The PFI andPFOpins are provided if additional voltage monitoring is needed. If the voltage at PFI is less than 1.15 V, the push-pullPFOpin will assert low. When the voltage at PFI exceeds the threshold voltage,PFOwill go high. These devices also feature a watchdog timer pin (WDI) that monitors processor activity and assertsRESETif the the processor is inactive longer than the watchdog timeout period. If the watchdog timer is not used, the WDI pin should be left floating. The TPS3617 and TPS3618 are available in an 8-pin MSOP package and are characterized for operation over a temperature range of -40°C to +85°C.

The TPS3617 and TPS3618 are battery-backup supervisors that monitor 5 V supplies. They provide a battery-backup function ideal for applications that require data retention of CMOS RAM during fault conditions. When the voltage at VDDdrops below a preset threshold (VIT), the active low push-pullRESEToutput asserts, and VOUTswitches from VDDto VBAT. When VDDrises above the trip threshold, VOUTswitches immediately from VBATto VDD. TheRESEToutput remains low until the delay time (td) expires. During power on,RESETis asserted when the supply voltage (VDDor VBAT) goes higher than 1.1 V. The PFI andPFOpins are provided if additional voltage monitoring is needed. If the voltage at PFI is less than 1.15 V, the push-pullPFOpin will assert low. When the voltage at PFI exceeds the threshold voltage,PFOwill go high. These devices also feature a watchdog timer pin (WDI) that monitors processor activity and assertsRESETif the the processor is inactive longer than the watchdog timeout period. If the watchdog timer is not used, the WDI pin should be left floating. The TPS3617 and TPS3618 are available in an 8-pin MSOP package and are characterized for operation over a temperature range of -40°C to +85°C. The TPS3617 and TPS3618 are battery-backup supervisors that monitor 5 V supplies. They provide a battery-backup function ideal for applications that require data retention of CMOS RAM during fault conditions. When the voltage at VDDdrops below a preset threshold (VIT), the active low push-pullRESEToutput asserts, and VOUTswitches from VDDto VBAT. When VDDrises above the trip threshold, VOUTswitches immediately from VBATto VDD. TheRESEToutput remains low until the delay time (td) expires. During power on,RESETis asserted when the supply voltage (VDDor VBAT) goes higher than 1.1 V. The PFI andPFOpins are provided if additional voltage monitoring is needed. If the voltage at PFI is less than 1.15 V, the push-pullPFOpin will assert low. When the voltage at PFI exceeds the threshold voltage,PFOwill go high. These devices also feature a watchdog timer pin (WDI) that monitors processor activity and assertsRESETif the the processor is inactive longer than the watchdog timeout period. If the watchdog timer is not used, the WDI pin should be left floating. The TPS3617 and TPS3618 are available in an 8-pin MSOP package and are characterized for operation over a temperature range of -40°C to +85°C.

The TPS3619 and TPS3620 families of supervisory circuits monitor and control processor activity by providing backup-battery switchover for data retention of CMOS RAM. During power on,RESETis asserted when the supply voltage (VDDor VBAT) becomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors VDDand keepsRESEToutput active as long as VDDremains 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 starts after VDDhas risen above VIT. When the supply voltage drops below VIT, the output becomes active (low) again. The product spectrum is designed for supply voltages of 3.3 V and 5 V. The TPS3619 and TPS3620 are available in an 8-pin MSOP package and are characterized for operation over a temperature range of –55°C to 125°C. The TPS3619 and TPS3620 families of supervisory circuits monitor and control processor activity by providing backup-battery switchover for data retention of CMOS RAM. During power on,RESETis asserted when the supply voltage (VDDor VBAT) becomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors VDDand keepsRESEToutput active as long as VDDremains 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 starts after VDDhas risen above VIT. When the supply voltage drops below VIT, the output becomes active (low) again. The product spectrum is designed for supply voltages of 3.3 V and 5 V. The TPS3619 and TPS3620 are available in an 8-pin MSOP package and are characterized for operation over a temperature range of –55°C to 125°C.

The TPS37-Q1 is a 65 V input voltage detector with 1 µA I DD, 1% accuracy, and with a fast 10 µs detection time. This device can be connected directly to 12 V / 24 V automotive battery system for continuous monitoring of over (OV) and under (UV) voltage conditions; with its internal resistor divider, it offers the smallest total solution size. Wide hysteresis voltage options are available to ignore cold crank, start-stop and various car battery voltage transients. Built-in hysteresis on the SENSE pins prevents false reset signals when monitoring a supply voltage rail. The separate VDD and SENSE pins allow redundancy sought by high-reliability automotive systems and SENSE can monitor higher and lower voltages than VDD. Optional use of external resistors are supported by the high impedance input of the SENSE pins. CTSx and CTRx pins allow delay adjustability on the rising and falling edges of the RESET signals. Also, CTSx functions as a debouncer by ignoring voltage glitches on the monitored voltage rails; CTRx operates as a manual reset ( MR) that can be used to force a system reset. TPS37-Q1 is available in WSON or SOT-23 package. The WSON package has wettable flanks allowing the facilitation for Automatic Optical Inspection (AOI) and low resolution X-ray inspection. The central pad is non-conductive to increase the creepage between VDD and GND per guidelines in IEC60664. The TPS37-Q1 is a 65 V input voltage detector with 1 µA I DD, 1% accuracy, and with a fast 10 µs detection time. This device can be connected directly to 12 V / 24 V automotive battery system for continuous monitoring of over (OV) and under (UV) voltage conditions; with its internal resistor divider, it offers the smallest total solution size. Wide hysteresis voltage options are available to ignore cold crank, start-stop and various car battery voltage transients. Built-in hysteresis on the SENSE pins prevents false reset signals when monitoring a supply voltage rail. The separate VDD and SENSE pins allow redundancy sought by high-reliability automotive systems and SENSE can monitor higher and lower voltages than VDD. Optional use of external resistors are supported by the high impedance input of the SENSE pins. CTSx and CTRx pins allow delay adjustability on the rising and falling edges of the RESET signals. Also, CTSx functions as a debouncer by ignoring voltage glitches on the monitored voltage rails; CTRx operates as a manual reset ( MR) that can be used to force a system reset. TPS37-Q1 is available in WSON or SOT-23 package. The WSON package has wettable flanks allowing the facilitation for Automatic Optical Inspection (AOI) and low resolution X-ray inspection. The central pad is non-conductive to increase the creepage between VDD and GND per guidelines in IEC60664.

The TPS3700-Q1 wide-supply window voltage detector operates over a 1.8 V to 18 V range. The device has two high-accuracy comparators with an internal 400-mV reference and two open-drain outputs rated to 18 V for overvoltage and undervoltage detection. The TPS3700-Q1 device can be used as a window voltage detector or as two independent voltage monitors; the monitored voltage can be set with the use of external resistors. For even wider input voltage capability up to 65 V, see theTPS37A-Q1or theTPS38A-Q1devices. The OUTA terminal is driven low when the voltage at the INA+ terminal drops below (VIT+– Vhys), and goes high when the voltage returns above the respective threshold (VIT+). The OUTB terminal is driven low when the voltage at the INB– terminal rises above VIT+, and goes high when the voltage drops below the respective threshold (VIT+– Vhys). Both comparators in the TPS3700-Q1 device include built-in hysteresis for filtering to reject brief glitches, thereby ensuring stable output operation without false triggering. The TPS3700-Q1 device is available in a Thin SOT-6 and a 1.5-mm x 1.5-mm WSON-6 package and is specified over the junction temperature range of –40°C to 125°C. The TPS3700-Q1 wide-supply window voltage detector operates over a 1.8 V to 18 V range. The device has two high-accuracy comparators with an internal 400-mV reference and two open-drain outputs rated to 18 V for overvoltage and undervoltage detection. The TPS3700-Q1 device can be used as a window voltage detector or as two independent voltage monitors; the monitored voltage can be set with the use of external resistors. For even wider input voltage capability up to 65 V, see theTPS37A-Q1or theTPS38A-Q1devices. The OUTA terminal is driven low when the voltage at the INA+ terminal drops below (VIT+– Vhys), and goes high when the voltage returns above the respective threshold (VIT+). The OUTB terminal is driven low when the voltage at the INB– terminal rises above VIT+, and goes high when the voltage drops below the respective threshold (VIT+– Vhys). Both comparators in the TPS3700-Q1 device include built-in hysteresis for filtering to reject brief glitches, thereby ensuring stable output operation without false triggering. The TPS3700-Q1 device is available in a Thin SOT-6 and a 1.5-mm x 1.5-mm WSON-6 package and is specified over the junction temperature range of –40°C to 125°C.