Analog Devices

TheADM6316/ADM6318/ADM6319/ ADM6320 /ADM6321/ADM6322are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. As well as providing power-on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. A reset signal can also be asserted by an external push button through a manual reset input. The seven devices feature different combinations of watchdog input, manual reset input, and output stage configuration, as shown in Table 1 of the data sheet.Each device is available in a choice of 26 reset threshold options ranging from 2.5 V to 5 V in 100 mV increments. There are also four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms (minimum) and four watchdog timeout options of 6.3 ms, 102 ms, 1600 ms, and 25.6 sec (typical). Not all device options are released for sale as standard models. See the Ordering Guide in the data sheet for details.The ADM6316/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 are available in 5-lead SOT-23 packages and typically consume only 3 μA, making them suitable for use in low power portable applications.APPLICATIONSMicroprocessor systemsComputers and controllersIntelligent instrumentsPortable equipment

TheADM6316/ADM6318/ADM6319/ADM6320/ ADM6321 /ADM6322are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. As well as providing power-on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. A reset signal can also be asserted by an external push button through a manual reset input. The seven devices feature different combinations of watchdog input, manual reset input, and output stage configuration, as shown in Table 1 of the data sheet.Each device is available in a choice of 26 reset threshold options ranging from 2.5 V to 5 V in 100 mV increments. There are also four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms (minimum) and four watchdog timeout options of 6.3 ms, 102 ms, 1600 ms, and 25.6 sec (typical). Not all device options are released for sale as standard models. See the Ordering Guide in the data sheet for details.The ADM6316/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 are available in 5-lead SOT-23 packages and typically consume only 3 μA, making them suitable for use in low power portable applications.APPLICATIONSMicroprocessor systemsComputers and controllersIntelligent instrumentsPortable equipment

The ADM6326/ADM6328/ADM6346/ADM6348devices provide low cost solutions for protecting sensitive circuitry, such as micro-processor and telecommunications circuitry.With built-in glitch immunity, ultralow supply currents, and 24 reset threshold voltage options, the ADM6326/ADM6328/ADM6346/ADM6348 not only ensure that systems are immune to fast transients on VCC, but also that the devices are suitable for monitoring a variety of supply voltages in low power, portable equipment.These devices provide a reset output during power-up, power-down, and brownout conditions. On power-up, an internal timer holdsRESETasserted for at least 100 ms. This holds the microprocessor in a reset state until conditions have stabilized. The reset output remains operational with VCCas low as 1 V.The ADM6326 and ADM6346 have an active low push-pull reset output. The ADM6328 and ADM6348 have an active low open-drain reset output, which requires an external pull-up resistor. The ADM6326 and ADM6328 offer a choice of ten reset thresholds in increments between 2.2 V and 3.08 V, whereas the ADM6346 and ADM6348 offer a choice of 14 reset thresholds between 3.3 V and 4.63 V. Not all options are released for sale as standard models. See the Ordering Guide for details.These devices are available in a 3-lead SOT-23 package and operate over the extended temperature range of −40°C to +85°C.ApplicationsTelecommunicationsMicroprocessor systemsDesktop and notebook computersPortable equipment

The ADM6339 is a high accuracy supervisory circuit capable of monitoring up to four system supply voltages.The ADM6339 incorporates a variety of internally pretrimmed undervoltage threshold options for monitoring −5.0 V, 1.8 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V supply voltages. Tolerance levels of ±5% and ±10% are available. The device is also available with one to three adjustable threshold options. The adjustable voltage threshold options are 1.23 V, 0.62 V, and −0.5 V. See the Ordering Guide section for a list and description of all available options.If a monitored power supply voltage decreases below the minimum voltage threshold (or rises above the maximum voltage threshold for the −0.5 V and −5.0 V input options), a single active low output asserts, triggering a system reset. The output is open drain with a weak internal pull-up to the monitored IN2supply of typically 10 μA. After all voltages exceed the selected threshold level, the reset signal remains low for the reset timeout period (200 ms typical).The ADM6339 output remains valid as long as IN1or IN2exceeds 1 V. Unused monitored inputs should not be allowed to float or to be grounded; instead, they should be connected to a supply voltage greater than their specified threshold voltages.The ADM6339 is available in a 6-lead SOT-23 package. The device operates over the extended temperature range of −40°C to +85°C.

TheADM6326/ADM6328/ADM6346/ADM6348 devices provide low cost solutions for protecting sensitive circuitry, such as micro-processor and telecommunications circuitry.With built-in glitch immunity, ultralow supply currents, and 24 reset threshold voltage options, the ADM6326/ADM6328/ADM6346/ADM6348 not only ensure that systems are immune to fast transients on VCC, but also that the devices are suitable for monitoring a variety of supply voltages in low power, portable equipment.These devices provide a reset output during power-up, power-down, and brownout conditions. On power-up, an internal timer holdsRESETasserted for at least 100 ms. This holds the microprocessor in a reset state until conditions have stabilized. The reset output remains operational with VCCas low as 1 V.The ADM6326 and ADM6346 have an active low push-pull reset output. The ADM6328 and ADM6348 have an active low open-drain reset output, which requires an external pull-up resistor. The ADM6326 and ADM6328 offer a choice of ten reset thresholds in increments between 2.2 V and 3.08 V, whereas the ADM6346 and ADM6348 offer a choice of 14 reset thresholds between 3.3 V and 4.63 V. Not all options are released for sale as standard models. See the Ordering Guide for details.These devices are available in a 3-lead SOT-23 package and operate over the extended temperature range of −40°C to +85°C.ApplicationsTelecommunicationsMicroprocessor systemsDesktop and notebook computersPortable equipment

The ADM660 /ADM8660is a charge-pump voltage converter that can be used to either invert the input supply voltage giving VOUT= -VINor double it (ADM660 only) giving VOUT= 2 x VIN. Input voltages ranging from +1.5 V to +7 V can be inverted into a negative -1.5 V to -7 V output supply. This inverting scheme is ideal for generating a negative rail in single power supply systems. Only two small external capacitors are needed for the charge pump. Output currents up to 50 mA with greater than 90% efficiency are achievable, while 100 mA achieves greater than 80% efficiency.A Frequency Control (FC) input pin is used to select either 25 kHz or 120 kHz charge-pump operation. This is used to optimize capacitor size and quiescent current. With 25 kHz selected, a 10 µF external capacitor is suitable, while with 120 kHz the capacitor may be reduced to 2.2 µF. The oscillator frequency on the ADM660 can also be controlled with an external capacitor connected to the OSC input or by driving this input with an external clock. In applications where a higher supply voltage is desired it is possible to use the ADM660 to double the input voltage. With input voltages from 2.5 V to 7 V, output voltages from 5 V to 14 V are achievable with up to 100 mA output current.The ADM8660 features a low power shutdown (SD) pin instead of the external oscillator (OSC) pin. This can be used to disable the device and reduce the quiescent current to 300 nA.APPLICATIONSHandheld InstrumentsPortable ComputersRemote Data AcquisitionOp Amp Power Supplies