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TPS3711 - 36V Voltage Detector, 400mV Ref | Texas Instruments
The Texas Instruments TPS3711 is a precision voltage detector that combines a comparator and an internal 400 mV reference for undervoltage detection. It operates over a wide supply voltage range of 1.8 V to 36 V, making it suitable for a variety of industrial and automotive applications. The device features a high-accuracy threshold voltage of 400 mV with 0.75% accuracy over temperature and built-in hysteresis for noise rejection, ensuring stable output operation without false triggering. The TPS3711 is available in a SOT-23-6 (SOT-6, SOT-23-THIN) package and is specified from -40C to +125C junction temperature. A voltage detector, also called a voltage supervisor or reset IC, monitors a supply voltage and asserts a signal when the monitored rail falls below a preset threshold. It belongs to the supervisory circuit family within power management ICs, a sub-category of semiconductor voltage regulators and system-protection devices. Voltage detectors are essential in processor-based systems, where they hold the MCU in reset until the rail is stable, preventing erratic operation during power-up and brown-out events. Key features include an open-drain output rated to 25 V for flexible level translation to any logic rail, a built-in hysteresis window that provides noise immunity, and low quiescent current that suits battery-powered designs. The wide supply range of 1.8 V to 36 V allows the TPS3711 to monitor 3.3 V, 5 V, 12 V, 24 V, and 36 V industrial rails directly. Technically, the device uses a precision bandgap reference and comparator. The monitored voltage is set with an external resistor divider on the SENSE pin, giving a fully adjustable trip point. OUT is driven low when SENSE drops below the negative threshold and goes high when the voltage recovers. The open-drain output requires an external pull-up resistor. Typical applications include undervoltage detection in industrial control systems, 12 V/24 V/36 V rail monitoring in automotive and telecom equipment, and portable device battery supervision. When designing with the TPS3711, size the resistor divider for the desired threshold, account for hysteresis to avoid chatter, and decouple the SENSE pin with a small capacitor to reject fast transients.
TPS3711DDCR - 36V Wide-Supply Voltage Detector | Texas Instruments
The Texas Instruments TPS3711DDCR is a wide-supply voltage comparator that operates over a 1.8 V to 36 V range in a 6-pin SOT-23-THIN (DDC) package. The device features a precision comparator with an internal 400 mV reference and an open-drain output rated to 25 V for undervoltage detection. The monitored voltage is set with external resistors, allowing flexibility for any threshold between 400 mV and 6 V. What is a voltage supervisor (also called a voltage detector or reset IC)? A voltage supervisor is a power-management IC that continuously monitors a supply rail and asserts a reset or fault signal when the rail falls outside a programmed window. Supervisors sit hierarchically under power management ICs, alongside LDOs, DC-DC converters, and battery monitors. They are essential building blocks in microcontrollers, SoCs, and FPGA-based systems, where brown-outs or power-rail glitches can cause latch-up, memory corruption, or undefined logic states. Key features include a wide 1.8 V to 36 V operating range, internal 400 mV ±1.5% reference, open-drain output capable of pulling to 25 V, low quiescent current in the microamp range, and a small SOT-23-6 footprint. The TPS3711 uses OUT driven low when the voltage at the SENSE pin drops below the negative threshold and returns high when SENSE recovers, giving designers a clean logic-level reset signal with a known pull-up reference. The TPS3711DDCR uses a precision analog comparator with an internal bandgap-derived 400 mV reference. The open-drain output stage allows the reset signal to be pulled up to any voltage up to 25 V, independent of the device supply, which is essential for interfacing low-voltage MCUs to higher-voltage rails. The SOT-23-THIN package provides a compact footprint while maintaining industrial -40°C to +125°C operating range. Typical applications include industrial PLCs and process controllers, automotive body and infotainment modules, battery management systems, microcontroller brown-out detection, and overvoltage/undervoltage protection in 12 V and 24 V industrial buses. The wide supply range is particularly valuable for 24 V industrial systems where traditional 5 V-only supervisors cannot operate directly from the bus. When designing with the TPS3711, select the external resistor divider so that the sensed voltage equals 400 mV at the desired threshold. A 100 kΩ to 1 MΩ total resistance keeps quiescent current low without making the SENSE pin noise-sensitive. Always pull OUT up to a valid logic rail through a resistor; do not leave it floating. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
TPS3801L30DCKRG4 - 2.64V Voltage Supervisor SC-70-5 | TI
The Texas Instruments TPS3801L30DCKRG4 is an ultra-small supply voltage supervisor IC that monitors a single 2.64V rail, packaged in a 5-pin SC-70 (SOT-323, TI package code DCK) with an active-low, push-pull RESET output. It belongs to the TPS380x family of microprocessor supervisory circuits and offers a fixed threshold of 2.64V with 200 ms typical reset delay. The 'L30' suffix denotes the specific 2.64V threshold variant within the family. The 'G4' suffix indicates a Pb-free, RoHS-compliant, green-grade reel packaging option from TI. A voltage supervisor (also called a reset IC or power-on reset supervisor) is a power-management device that holds a host processor in reset until the supply rail is stable and within tolerance. Voltage supervisors sit in the hierarchy below LDOs and DC-DC converters, ensuring that downstream processors do not execute code or access peripherals at indeterminate logic levels during power-up, brown-out, or transient dropout events. The TPS3801L30DCKRG4's push-pull active-low RESET output makes it directly compatible with CMOS logic inputs on most DSPs and microcontrollers without needing an external pull-up resistor. Key features include an ultra-low supply current of 9 µA typical, ensuring negligible load on the monitored rail. The reset output remains asserted as long as VDD is below the threshold and continues for 200 ms after VDD rises above the threshold, satisfying the reset timing requirements of most DSP and MCU families. The SC-70-5 package measures roughly 2.0 mm x 1.25 mm, making it among the smallest supervisors available. The device operates across an industrial temperature range of -40C to +85C and is qualified to TI's standard JEDEC reliability flow. Internally, the TPS3801L30DCKRG4 uses a precision bandgap reference and comparator topology. A voltage divider and reference comparator generate the reset signal, while an internal timer block produces the 200 ms delay using an on-chip oscillator. The push-pull output stage actively drives both high and low, eliminating external pull-up components and reducing BOM count. Typical applications include DSP/FPGA power supervision in portable and battery-powered equipment, microcontroller reset generation in industrial sensors, single-rail monitoring in handheld medical devices, and brown-out protection in IoT endpoints. The SC-70-5 footprint makes it well-suited for space-constrained designs. When designing with this device, place it as close as possible to the IC it monitors, and route VDD through a short, wide trace to minimize voltage drop during high-current transients. Ensure the monitored rail's nominal value stays well above the 2.64V threshold with adequate margin under worst-case load. This page synthesizes distributor pricing, SC-70-5 drop-in alternatives within the TPS380x family, and practical design notes not found in the manufacturer datasheet alone.
TPS3808G01QDBVRQ1 - Auto Voltage Supervisor, 0.4V-5V SENSE | TI
The Texas Instruments TPS3808G01QDBVRQ1 is an AEC-Q100 qualified microprocessor supervisory circuit that monitors system voltages from 0.4 V to 5 V and asserts an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset (MR) pin is driven low, all housed in a 6-pin SOT-23 (DBV) package. It features an adjustable reset threshold, a programmable reset delay from 1.25 ms to 10 s using an external capacitor, and a very low typical quiescent current of 2.4 mA, making it well suited for automotive and industrial always-on monitoring rails where standby power budget is critical. A voltage supervisor IC (also called a reset supervisor or voltage monitor) is a power management integrated circuit that observes a system rail and generates a clean reset signal to a microcontroller, SoC, or FPGA whenever that rail falls outside its valid operating window. Voltage supervisors sit hierarchically above DC-DC converters and LDOs in the power tree: DC-DC converters and LDOs regulate the rail, while supervisors verify the rail is healthy and force the processor into a known-good reset state on faults such as brown-out, power-up glitch, or slow ramp. They are fundamental building blocks for functional-safety designs (ISO 26262, IEC 61508) and any application that must boot deterministically. The TPS3808G01QDBVRQ1 combines high threshold accuracy across the full -40 C to +125 C automotive Grade-1 range, an active-low RESET output with open-drain topology that allows wired-OR connection of multiple supervisors, a manual-reset input for operator or host push-button reset, and a programmable delay capacitor pin (CT) that decouples the watchdog timing from the supply ripple. Compared with simple internal MCU brown-out detectors, this part provides a tighter threshold tolerance and a cleaner, externally programmable reset pulse width that is independent of firmware code paths. Typical applications include automotive ECU power-good monitoring, ADAS sensor rail supervision, body and chassis controller reset management, industrial PLC watchdog, and battery-powered IoT node supply monitoring. The wide SENSE input range also enables direct supervision of low-voltage rails (down to 0.4 V) used by modern processors without auxiliary dividers in many cases. When designing with this device, place the CT delay capacitor close to the CT pin and use a 1.5 nF X7R ceramic for an approximate 100 ms reset delay per capacitor value guidelines. Ensure the pull-up resistor on open-drain RESET is sized to the downstream logic level and routed away from noisy switching nodes to avoid false resets during load transients. This page aggregates distributor stock, drop-in SOT-23-6 alternatives, and practical design considerations that complement the TI datasheet and help engineers shorten the BOM selection and qualification cycle for automotive supervisory circuits.
TPS3808G01QDRVRQ1 - Auto-Q1 0.4-5V Adj Supervisor | Texas Instruments
The Texas Instruments TPS3808G01QDRVRQ1 is an AEC-Q100-qualified, low-quiescent-current microprocessor supervisory circuit that monitors system voltages from 0.4 V to 5 V in a 6-pin WSON (DRV, 2x2 mm) package. It asserts an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset (MR) pin is driven low, and holds RESET low for a user-adjustable delay time after both SENSE and MR return above their thresholds. A voltage supervisor (also called a reset IC or voltage monitor) is a dedicated power-management device that observes one or more system rails and generates a clean reset signal to a microcontroller, FPGA, ASIC, or processor whenever the rail sags, droops, or falls out of specification. Voltage supervisors sit below DC-DC converters and LDOs in the power-tree hierarchy and above the digital logic that depends on valid supply rails. By separating the monitoring function from the regulator, designers can guarantee deterministic boot and brown-out behavior independent of converter load transients. Key features include an adjustable SENSE threshold down to 0.405 V with high threshold accuracy, a programmable reset delay from 1.25 ms to 10 s via an external capacitor on the CT pin, very low quiescent current of 2.4 uA typical, and an open-drain active-low RESET output that supports wired-OR with other supervisors. The device operates from a 1.7 V to 6.5 V VDD supply and tolerates SENSE voltages up to 6.5 V independent of VDD, simplifying dual-rail monitoring. The TPS3808G01QDRVRQ1 is the automotive-grade (-Q1) version of the TPS3808G01DRVR and adds AEC-Q100 qualification, extended temperature support, and PPAP documentation for safety-critical automotive designs. Internally, a precision bandgap reference, comparator, and delay-timing block combine to give a glitch-immune, monotonic RESET behavior even during fast load steps. Typical applications include automotive ECU power-rail monitoring, ADAS sensor supplies, body and chassis modules, industrial PLC supervisory circuits, battery-powered IoT sensor nodes, and FPGA/MCU brown-out protection. The combination of 2.4 uA IQ and a tiny 2x2 mm WSON footprint makes it ideal where board area and standby drain are at a premium. Designers should place the CT capacitor close to the CT pin and use a 0.1 uF VDD bypass capacitor within 1 mm of the device. Compared with the non-automotive TPS3808G01DRVR, the Q1 variant is the drop-in choice when an AEC-Q100 release is required.
TPS3808G18DRVR - 1.8V Voltage Supervisor, 2.4µA Iq, WSON-6 | TI
The Texas Instruments TPS3808G18DRVR is a low-quiescent-current, programmable-delay microprocessor supervisory circuit that monitors a 1.8V system rail in a 6-pin WSON (DRV, 2x2 mm) package. It features a fixed 1.8V sense threshold with 0.5% typical accuracy, an open-drain RESET output, manual reset (MR) input, and an adjustable reset delay time set by an external capacitor up to 10 s. A voltage supervisor (also called a reset IC, voltage monitor, or power-on reset circuit) is a power management IC that observes a system supply rail and asserts a reset signal whenever the rail falls outside its valid operating window. Supervisors sit hierarchically above DC-DC converters and LDOs in the power tree: they do not generate power themselves but rather guarantee that downstream logic (microcontrollers, FPGAs, ASICs, DSPs) only starts up after the rail has stabilized, and re-enters reset whenever the rail dips below a safe threshold. The TPS3808 family belongs to the supervisor category within TI's broader Power Management IC portfolio. Key features of the TPS3808G18DRVR include a typical quiescent current of 2.4 µA (critical for battery-powered designs), 20 ms minimum reset delay (factory-trimmed, capacitor-adjustable up to 10 s), open-drain RESET output for wired-OR with other rails, an active-low manual reset input, and a wide operating temperature range of -40°C to +125°C. The 2x2 mm WSON-6 footprint occupies roughly 4 mm² of PCB area, suiting it for space-constrained wearables, IoT endpoints, and sensor nodes. Architecturally, the TPS3808 combines a precision bandgap reference, a comparator chain, a programmable delay timer, and an open-drain NMOS output stage. The factory-trimmed 1.8V sense threshold means no external resistor divider is required, reducing BOM count and eliminating trim errors. The CT pin accepts an external capacitor to set tD = 2.39 × 10^5 × CCT (seconds), giving the designer flexible power-on reset timing. Typical applications include 1.8V core rail monitoring in IoT sensors and wearables, FPGA/MCU brown-out protection in battery-powered systems, point-of-load monitoring in multi-rail designs, and industrial sensor nodes that require deterministic startup. The 2.4 µA Iq makes the part well suited to coin-cell and lithium-thionyl-chloride powered devices that must remain in standby for years. When designing with this part, place the CT capacitor as close as possible to the CT pin to minimize leakage paths and to ensure accurate delay timing. Pull-up resistance on the open-drain RESET output must respect the V_PULLUP rail used by the downstream logic; tying RESET to a different rail than VDD is a supported use case. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet - giving engineers a single decision-ready reference.
TPS3808G33QDBVRQ1 - 3.3V Auto Voltage Supervisor | Texas Instruments
The Texas Instruments TPS3808G33QDBVRQ1 is an automotive-qualified, ultra-low quiescent current voltage supervisor with a fixed 3.3V sense threshold, housed in a 6-pin SOT-23 (DBV) package. It monitors system voltages from 0.4V to 6.5V and asserts an active-low open-drain RESET signal when SENSE drops below the preset threshold or when the manual reset (MR) pin is pulled low. With typical quiescent current of just 2.4 uA, it is purpose-built for always-on battery-powered applications. A voltage supervisor (also called a reset supervisor or power-on reset generator) is a power management IC that monitors a supply rail and asserts a RESET signal whenever the rail falls outside a preset window. Supervisors sit alongside LDOs and DC-DC converters in the broader power management IC hierarchy and are essential building blocks for microcontroller and DSP-based systems where deterministic startup behavior and brown-out protection are required. Key features include 2.4 uA typical quiescent current, 10 ms to 10 s programmable reset delay time set by an external capacitor on the CT pin, 0.5% typical threshold accuracy, and a wide operating temperature range of -40C to +125C qualified to AEC-Q100 for automotive use. The open-drain RESET output allows wire-OR connection with other supervisory signals and direct interface to multi-voltage systems. The TPS3808G33QDBVRQ1 uses a precision bandgap reference and a hysteretic comparator architecture to provide stable threshold detection across temperature and process variations. The MR input supports an external push-button reset and accepts slow or noisy signals through its built-in debounce. The CT programmable delay pin lets designers tune the reset pulse width to match downstream processor timing requirements. Typical applications include automotive ECU power supervision, battery-powered IoT devices, industrial PLC controllers, and FPGA / MCU brown-out protection. In automotive body and chassis modules, the supervisor guarantees defined reset behavior during cranking transients and load-dump events. When designing with this device, place the CT capacitor close to pin 6 and ensure pull-up on the open-drain RESET output matches the downstream logic level. Verify sense voltage accuracy across the full operating temperature range, and consider derating quiescent current at elevated temperatures. This page synthesizes distributor pricing, automotive-grade cross-reference alternatives, and practical design notes not found in the manufacturer datasheet alone.
TPS3808G50QDBVRQ1 - 5V Auto-Q1 Voltage Supervisor SOT-23-6 | Texas Instruments
The Texas Instruments TPS3808G50QDBVRQ1 is an AEC-Q100 qualified, automotive-grade microprocessor supervisory circuit in a 6-pin SOT-23 (DBV) package, designed to monitor a 5.0 V system rail and assert an active-low open-drain RESET signal when the sensed voltage drops below a factory-preset threshold. According to TI product literature, the device integrates a power-on reset generator with an adjustable delay time, supports a manual reset (MR) input, draws a typical quiescent current of 2.4 mA, and operates across a -40°C to +125°C automotive temperature range. A voltage supervisor (or reset IC) is a power-management device that observes a supply rail and forces a microcontroller or processor into a known-good boot state whenever the rail falls out of regulation. Supervisors sit beneath the broader power-management IC (PMIC) hierarchy, alongside LDOs, DC-DC converters, and battery chargers, and they serve as the last line of defense against corrupted firmware execution caused by brown-outs, in-rush transients, or load steps. Unlike discrete RC reset circuits, supervisors deliver precise threshold accuracy and predictable timing independent of capacitor leakage. Key features of the TPS3808G50QDBVRQ1 include a high threshold accuracy of 1.0% (typical), an adjustable reset timeout set by an external CT capacitor, an active-low open-drain RESET output that can be wire-ORed with other rails, and a dedicated manual reset pin for push-button or host-driven assertion. The SOT-23-6 footprint occupies only 2.9 mm × 1.6 mm of board area, making it suitable for space-constrained modules. The Q1 suffix denotes TI's automotive grade, qualifying the device for AEC-Q100 stress testing. Internally, the device combines a precision bandgap reference, a comparator, a delay timer, and an open-drain output stage. The SENSE input is compared against the internal 5.0 V threshold; when the voltage falls below threshold, the output asserts low and the programmable delay (set by CT) is initiated once SENSE recovers above threshold. This architecture decouples the monitor trip point from the delay timing, allowing the system designer to choose the wake-up behavior independently from the brown-out trip point. Typical applications include automotive ECU power supervision, ADAS sensor modules, body and chassis controllers, infotainment head-unit rail monitoring, and any industrial system requiring a compact, AEC-Q100 qualified supervisor for a 5 V logic rail. The 1.7 V to 6.5 V input range also covers 3.3 V rails when the G50 variant's nominal 5.0 V threshold is intentionally chosen for early-warning supervision. When designing with this part, place the CT capacitor close to the CT pin to avoid leakage paths that would alter the delay time, and use a pull-up resistor on RESET sized for the load capacitance. Verify that the SENSE pin is bypassed at high dV/dt loads to prevent false tripping. This page combines distributor pricing, drop-in pin-compatible alternatives, and practical design notes not aggregated on the manufacturer product page.
TPS3825-50DBVR - 5V SOT-23-5 Voltage Supervisor w/ Manual Reset | TI
The Texas Instruments TPS3825-50DBVR is a voltage supervisor (reset IC) with manual reset, monitoring a fixed 5.0V threshold in a 5-pin SOT-23 (DBV) package operating from -40C to +85C. It provides circuit initialization and timing supervision primarily for DSP and processor-based systems, with push-pull, totem-pole active-low RESET output and a factory-set reset delay time. A voltage supervisor, also known as a reset IC or voltage monitor, is a power management device that observes a system supply rail and asserts a reset signal whenever the rail falls below a precise threshold. The device category sits hierarchically under supervisors and reset ICs, then power management, then power management ICs, and ultimately semiconductors. Supervisors prevent microcontrollers, DSPs, FPGAs, and ASICs from executing code with an under-voltage supply, which can cause unpredictable latch-up or memory corruption. Key features include a fixed 5.0V supply voltage supervision range, push-pull totem-pole RESET output topology, manual reset input (MR), an integrated watchdog timer, and a power-on reset generator that asserts when VDD exceeds 1.1V. The RESET signal stays asserted for a fixed delay time after VDD recovers, allowing the downstream processor's clock and PLL to stabilize before code execution resumes. The SOT-23-5 footprint makes it compatible with space-constrained portable and embedded designs. The TPS3825-50DBVR architecture combines a precision bandgap reference, comparator, and timer block on a single die. During power-up the reset asserts immediately when VDD crosses 1.1V and remains asserted until VDD exceeds 4.55V (the 5V nominal threshold) plus the timeout delay. The watchdog subsystem expects a falling edge on the WDI pin within the watchdog window; failure to receive that edge asserts reset to indicate a firmware hang. Typical applications include DSP and microcontroller supply monitoring in industrial controls, point-of-sale terminals, automotive infotainment (via the -Q1 grade), PLCs, and any 5V system requiring supervised power-up, brownout protection, and watchdog supervision. For 3.3V systems the related TPS3823-33 variant is recommended; for 3V systems use TPS3825-30. When designing with this device, ensure the MR pin has a defined logic state (tie high through a pull-up resistor if unused) and that the WDI service routine toggles within the watchdog window. Decouple VDD with a 0.1uF ceramic capacitor placed within 5 mm of the pin. This page synthesizes distributor stock, drop-in alternatives within the SOT-23-5 footprint, and design notes for supervisor selection that go beyond the manufacturer datasheet alone.
TPS3850G30QDRCRQ1 - 3.3V Window Supervisor w/ Watchdog Q1 | TI
The Texas Instruments TPS3850G30QDRCRQ1 is an automotive-grade, precision window voltage supervisor with a programmable window watchdog timer, integrating overvoltage (OV), undervoltage (UV), and watchdog monitoring in a single 10-pin VSON (DRC) package measuring 3 mm x 3 mm. The fixed 3.3 V sense threshold variant achieves 0.8% threshold accuracy over the full -40 C to +125 C automotive temperature range, with built-in hysteresis on both OV and UV comparators for tight-tolerance system designs. A window voltage supervisor is a power-rail monitoring IC that asserts a reset whenever the monitored supply falls outside a programmable overvoltage/undervoltage window, distinct from a simple single-threshold supervisor. Within the broader system hierarchy, the TPS3850G30QDRCRQ1 belongs to the supervisor and reset IC family, sitting under power management ICs in safety-critical electronics. It pairs an internal precision bandgap reference with a window comparator and a window watchdog timer (WDT), supporting the functional-safety demands of ISO 26262 ASIL-rated automotive ECUs. Key features include a single-channel open-drain reset output, programmable watchdog timeout via an external capacitor on the WT pin, programmable reset delay via an external capacitor on the DLY pin, integrated immunity to short transients on the SENSE line, and active-low watchdog input (WDI). The 10-VSON DR package's 3 mm x 3 mm footprint plus exposed thermal pad simplifies PCB layout in dense ECU designs and minimizes board area versus comparable SOT-23-style supervisors. The architecture uses a precision bandgap reference feeding two comparators that window the SENSE pin against VIT+ (OV) and VIT- (UV) thresholds, while an independent RC-controlled timer block creates the watchdog window for the WDT input. Auto-grade AEC-Q100 qualification and 0.8% threshold accuracy allow it to directly monitor tight-tolerance rails such as 3.3 V microcontrollers, CAN transceivers, and SoC core rails, where any supply excursion outside the safe window must trigger a deterministic reset rather than rely solely on internal MCU monitors. Typical applications include automotive ECU power supervision, ADAS controller rails, body and chassis modules, industrial PLC safety outputs, and redundant power-rail monitoring. The AEC-Q100 qualification also extends to electric-vehicle battery-management controllers where the supervisor must operate reliably across wide cold-crank and load-dump transients. When designing with this device, place the WT capacitor and the DLY capacitor as close as practical to their respective pins to avoid leakage paths that would shift timing accuracy. A 0.1 uF decoupling capacitor on VDD, plus a 1 M ohm resistor divider where adjustable thresholds are needed, is recommended for high-noise automotive environments. This page synthesizes AEC-Q100 status, drop-in watchdog supervisor alternatives, and practical automotive layout notes not found in the original TPS3850-Q1 datasheet alone.
TPS38700B01NRGER - I2C 12-Ch Sequencer + Watchdog | VQFN-24
The Texas Instruments TPS38700B01NRGER is an integrated multi-channel voltage sequencer with window watchdog and I2C programmability, delivered in a 24-pin 4 mm x 4 mm VQFN (RGE) package. It supports up to 12 sequencing channels, preprogrammed OTP defaults, and I2C control for flexible system-level power-tree management. The device is designed for systems that require precise power-up and/or power-down sequencing and can be interfaced with multi-channel voltage supervisors. A power-supply sequencer is a supervisory controller IC that orchestrates the order and timing in which multiple DC rails turn on and off. It belongs to the broader power-supply controller hierarchy: power-supply sequencer -> supervisor/monitor -> power management IC -> semiconductor. By replacing discrete RC delay chains and complex glue logic, the TPS38700B01NRGER reduces BOM count and PCB area while improving reliability through programmable fault response (retry, latch, ignore) and built-in watchdog supervision. Key features include OTP-programmable default thresholds and sequence timing for up to 12 channels, I2C-compatible interface for runtime adjustments, an integrated window watchdog timer, and dedicated fault outputs. The sequencer can interface directly with external voltage supervisors (such as the TPS3899 family) or onboard LDOs, with each channel capable of asserting enable signals and detecting under-voltage/over-voltage conditions via digital status flags. The internal architecture combines an OTP memory for default configuration, an I2C slave for host access, programmable timers for rail sequencing, and a window watchdog block that monitors host MCU activity. The 4x4 mm VQFN-24 package with exposed thermal pad supports compact PCB layouts typically found in dense compute, networking, and storage platforms. Typical applications include FPGA/processor multi-rail sequencing, server and storage platforms, networking switches, industrial PLC controllers, and any system where the host MCU, ASIC, or FPGA needs deterministic power sequencing plus watchdog supervision in a single chip. When designing with this part, plan the OTP defaults early because OTP is one-time programmable - verify sequence order, threshold voltages, and timing against the system power tree. Use the I2C interface only for runtime overrides of OTP defaults; do not rely on I2C as the sole configuration source if the system must power up without an active host. This page synthesizes distributor pricing for the TPS38700B01NRGER, drop-in alternative part numbers, and practical design notes not consolidated in the manufacturer datasheet.
TPS38700C03NRGERQ1 - Automotive 12-CH Sequencer + Watchdog QFN-24
The Texas Instruments TPS38700C03NRGERQ1 is an automotive-grade (AEC-Q100 qualified) multichannel power-supply sequencer with integrated window watchdog timer and I2C programmability, packaged in a 24-pin 4 mm x 4 mm VQFN (RGE) package. The device supervises up to 12 voltage rails and is designed for systems that require precise power-up and power-down sequencing of high-performance processors, FPGAs, ASICs, and SoCs. What is a power-supply sequencer? A power-supply sequencer is a controller IC that turns multiple voltage rails on and off in a defined order and timing rather than providing regulation itself. It sits between the system PMIC rails (or discrete regulators) and the digital load. The sequencer hierarchy is: voltage sequencer -> power management controller -> power management IC (PMIC) -> semiconductor. Sequencers are essential whenever downstream devices require a specific rail order for proper initialization (e.g., core before I/O before analog) or to prevent latch-up, inrush-induced brown-outs, or device damage during power transitions. Key features include support for up to 12 sequenced channels via an external cascade, OTP-default timing windows that load automatically on power-up, I2C-configurable threshold, delay, and watchdog timeout, and an integrated window watchdog for the host MCU. The device operates from a wide supply range and provides active-high enables to external regulators, along with a fault-output (nRST/WDO) that asserts when any monitored rail is out of tolerance or the watchdog window is violated. Architecturally, the TPS38700-Q1 combines a precision internal reference, twelve programmable threshold comparators via external resistor dividers, I2C control logic, and a window watchdog timer. The OTP banks store the default rail configuration and timing, so production boards boot deterministically even before firmware reprograms the device. The 24-pin VQFN (4x4) thermal pad delivers low junction-to-PCB thermal resistance, enabling high-channel-count designs on a compact footprint suitable for automotive ECU modules. Typical applications include automotive ADAS domain controllers, advanced driver-assistance ECUs, infotainment head units, zonal/zonal-architecture compute modules, and industrial multi-rail FPGA/ASIC platforms. The wide operating range and AEC-Q100 grade make it a strong fit for any high-reliability multi-rail board. When designing with this device, leave margin for OTP timing drift across temperature and validate the watchdog window against the slowest legitimate service routine. Cascade multiple TPS38700-Q1 parts when sequencing more than the local channel budget allows, tying their fault lines together so the system does not partial-power in a faulted state.
TPS38700C04NRGER - I2C 12-Ch Power Sequencer | Texas Instruments
The Texas Instruments TPS38700C04NRGER is a multichannel power-supply sequencer with I2C support, a window watchdog, and OTP-programmed defaults, integrating up to 12 sequence channels in a 24-pin VQFN (4x4 mm, RGE) package. It supports 1.6 V to 5.5 V supervision rails and is intended for systems requiring deterministic power-up and power-down ordering across multiple voltage rails. A power-supply sequencer is a supervisory power-management IC that enforces the order in which system rails turn on and off, preventing in-rush, latch-up, and signal contention in complex multi-rail SoCs, FPGAs, and processor designs. It belongs to the hierarchy: power-supply sequencer -> supervisor/monitor -> power management IC -> semiconductor. Sequencers differ from simple voltage supervisors in that they actively drive enable pins of downstream regulators in a timed sequence, rather than just asserting a reset signal once all rails are valid. Key features of the TPS38700C04NRGER include: up to 12 sequencing slots assignable via OTP or I2C, a programmable window watchdog with GPIO conversion, individual rail voltage monitoring with programmable thresholds, and an integrated 4-channel 8-bit ADC for margining or telemetry. The I2C interface (Fast/Standard mode, 100/400 kHz) allows in-system reprogramming of slot timing, watchdog timeout, and fault-handling behavior. Default sequencing is loaded from OTP at power-up so the device functions even before host software initializes. Architecturally, the TPS38700 uses a precision bandgap reference, per-channel programmable-threshold comparators, a 4-channel ADC for rail margining, and a sequencing state machine with non-volatile OTP memory. The internal EEPROM-style storage holds the default configuration (C04 variant), while I2C provides dynamic override of slot timing and watchdog windows. The 24-pin VQFN provides low thermal resistance for the modest power dissipation typical of supervisory ICs. Typical applications include sequencing of FPGA/SoC core, I/O, and auxiliary rails; ASIC and processor power-up coordination; telecom baseband power sequencing; and industrial control boards that require multi-rail coordination with fault response. The window watchdog and GPIO conversion simplify host-side fault handling. A key design consideration is OTP variant selection - the C04 suffix indicates a factory-programmed default sequence - so engineers must verify the C04 default matches their required rail order before committing the design to layout, and budget I2C lines if field reprogramming is required. This page synthesizes distributor pricing, drop-in alternative sequencing parts sharing the same 24-pin VQFN footprint, and practical design notes that are not consolidated in the manufacturer datasheet alone.
TPS389001DSET - 1.15V Supervisor, 6-WSON | Texas Instruments
The Texas Instruments TPS389001DSET is a precision, low-quiescent-current voltage supervisor in a 6-pin WSON (1.5x1.5 mm) package that monitors system rails as low as 1.15 V and asserts an open-drain RESET signal when the SENSE voltage falls below a preset threshold or when the manual reset (MR) pin is driven low. It operates from a 1.5 V to 5.5 V supply, draws only a few microamperes of quiescent current, and achieves 1% threshold accuracy across temperature, making it well suited to battery-powered and space-constrained designs. A voltage supervisor, also known as a reset IC or voltage monitor, is a type of power management integrated circuit that observes a system rail and generates a deterministic reset or interrupt when that rail drifts out of regulation. Supervisors sit within the broader power management hierarchy: voltage supervisor -> reset/monitor IC -> power management IC -> semiconductor. They are essential in any system where a microcontroller, SoC, or processor requires a clean, glitch-free reset signal during power-up, power-down, and brown-out events. The TPS3890 family specifically targets ultra-low-power monitoring with a user-programmable reset delay. Key features include a user-adjustable threshold (TPS389001 variant, factory-trimmed to roughly 1.0 V above VREF on the SENSE pin), a programmable reset delay set by an external capacitor on the CT pin, a manual reset (MR) input, and an open-drain active-low RESET output that supports wired-OR with other rails. The internal bandgap reference and trimmed comparator deliver 1% monitoring accuracy, while the typical quiescent current in the single-digit microampere range extends battery life in always-on applications. Architecturally, the TPS389001 uses a precision bandgap reference, a high-accuracy comparator, an adjustable delay block driven by CT, and a low-leakage open-drain FET output. The combination of hysteresis on the sense input and the programmable delay prevents false resets during brief transients, while the wide 1.5 V to 5.5 V supply range allows the device to be powered directly from the rail it monitors in many systems. Typical applications include IoT sensor nodes, wearables, portable medical monitors, e-metering, and any battery-powered MCU system that needs a robust power-on reset. The 6-WSON (1.5x1.5) footprint makes it one of the smallest supervisors in its class, ideal for high-density boards. When designing with this part, place the CT capacitor close to the CT pin to ensure accurate timing, and add a pull-up resistor (typically 10 kohm to 100 kohm) on the open-drain RESET output. Verify that the SENSE input is robust against inrush transients on the monitored rail. This page synthesizes distributor stock, drop-in alternatives in the same 6-WSON footprint, and practical design notes not found in the manufacturer datasheet.
TPS3897ADRYR - Single-Channel Adj Supervisor | Texas Instruments
The Texas Instruments TPS3897ADRYR is a single-channel, ultra-small adjustable voltage supervisor housed in a 6-pin USON (DRY) package measuring 1.45 mm x 1.0 mm. It monitors system voltages greater than 500 mV with 0.25% typical threshold accuracy and provides an active-high, open-drain reset output. The device operates across a 1.7 V to 6.5 V supply range and is qualified for -40C to +125C ambient operation. A voltage supervisor (also called a voltage monitor or reset IC) is a power-management device that observes a system rail and asserts a reset signal whenever the rail falls outside a programmable window. Supervisors sit between the upstream DC-DC converter and the downstream microcontroller/SoC, forming a critical layer in the power-tree hierarchy: PSU -> DC-DC converter -> voltage supervisor -> MCU/SoC core and I/O rails. The TPS3897 specifically belongs to TI's TPS389x sub-family of programmable-threshold monitors, distinguishing it from fixed-threshold supervisors such as the TPS3808 or TPS3831 series. Key features include an externally programmable threshold down to 500 mV, 1.0% maximum threshold accuracy over temperature, an adjustable reset delay set by an external capacitor on the CT pin, a logic enable input for output gating, and an ultra-low quiescent current of 1.5 uA typical. The device's small 6-pin USON footprint occupies less than 1.5 mm x 1.0 mm of board area, making it one of the smallest reset supervisors in TI's portfolio and ideal for space-constrained wearables and IoT nodes. Internally, the TPS3897 combines a precision bandgap reference, a low-offset comparator, and a programmable delay timer, all trimmed for low current draw and stable operation across industrial temperature ranges. The active-high open-drain output can be wire-ORed with other reset sources and pulled up to any rail up to 6.5 V, simplifying multi-supply sequencing. The 1% accurate threshold ensures reliable boot-time decisions on processors with tight Vcore tolerances. Typical applications include wearables, IoT sensor nodes, portable medical monitors, microcontroller reset supervisors, and battery-powered industrial endpoints. The same device also fits factory automation controllers and point-of-sale terminals that need a compact, accurate rail monitor. When designing with this part, place the CT delay capacitor within 5 mm of the CT pin and keep the SENSE input trace short and away from switching noise. The open-drain RESET output requires an external pull-up resistor to a valid logic rail; do not leave it floating. This page synthesizes verified distributor stock data, parametric drop-in alternatives in the same USON-6 footprint, and practical PCB/thermal/design notes that go beyond the manufacturer's datasheet, helping engineers select and source the TPS3897ADRYR with confidence.
TS117S - 350V 1-Form-A OptoMOS Telecom Switch | IXYS
The IXYS (now part of Littelfuse) TS117S is a 350 V normally-open (1-Form-A) solid-state relay integrated with an optocoupler driver in a single 8-pin SMD (Gull-Wing) package. The device uses optically-coupled MOSFET technology to deliver 3750 Vrms of input-to-output isolation, making it suitable for telecom line-interface cards where the control logic must remain galvanically isolated from the high-voltage line side. Load voltage is rated to 350 V peak, and load current is rated to 120 mA continuous / 300 mA short-term pulse. An optocoupler (also called an opto-isolator) is a semiconductor device that transfers an electrical signal between two isolated circuits using an internal infrared LED and a photodetector. Solid-state relays (SSRs) replace mechanical relays with MOSFET outputs, providing silent switching, no contact bounce, and orders-of-magnitude longer mechanical life. The TS117S combines both functions into one IC, occupying the role of a galvanically-isolated switch inside the broader hierarchy: SSR -> semiconductor switch -> discrete power semiconductor -> power management component. Key features include 35 ohm typical on-resistance, <1 mA LED trigger current, 50 pF typical output capacitance, and surge withstand compatible with telecom ringing and on-hook/off-hook transients. The SMD-8 footprint supports automated assembly and reflow soldering, and the device carries 3750 Vrms safety isolation between input and output. The TS117S ships with tin-lead or lead-free (RoHS-compliant) terminal finish options. The TS117S architecture places an AlGaAs infrared LED on the input side that drives two back-to-back MOSFET output switches on the load side, providing AC/DC switching capability. The lack of moving parts gives unlimited operational cycles and eliminates the acoustic noise of electromechanical relays. Built-in current-limiting and thermal considerations make it robust against inductive kick and short-duration overloads typical of telephone-line transient events. Typical applications include telecom line-interface cards (SLIC hook-switch / ring-trip / test access), modem and fax line switching, PBX trunk cards, instrumentation multiplexing, and process-control I/O isolation. The compact 8-pin SMD package suits high-density line-card designs where board area is at a premium. When designing with this part, ensure the LED input current is at least 5 mA for reliable turn-on across temperature, place a 0.1 uF bypass capacitor near the LED anode pin, and verify that the peak load voltage (including ringing transients) never exceeds the 350 V rating. The maximum isolation voltage rating of 3750 Vrms must be observed for safety-compliant creepage and clearance. This page combines distributor pricing snapshots, drop-in cross-brand alternatives from web cross-reference data, and practical PCB-layout guidance - information not collated on any single manufacturer datasheet.
TS831-4IZT - 4.5V Micropower Voltage Supervisor, Active-Low Reset, TO-92 | STMicroelectronics
The STMicroelectronics TS831-4IZT is a micropower voltage supervisor IC with an active-low reset output, packaged in a 3-pin TO-92 (Z tape and reel) through-hole form factor and featuring a factory-trimmed 4.5V threshold with an open-drain output stage. Operating from a 1V to 5.5V VCC supply range and consuming only 1.5 uA typical quiescent current, the part combines a precision bandgap reference and a comparator with internal thermally-matched resistors, eliminating external components normally required for window or threshold customization. A voltage supervisor is a specialized power management IC that monitors a system supply rail and asserts a reset signal whenever the rail voltage drops below a predefined safe operating threshold. Supervisors sit within the broader hierarchy of reset and power-good circuits, voltage detectors, and watchdog timers in PMIC (Power Management IC) families. Unlike a voltage regulator that actively controls the rail, a supervisor only observes and reports - allowing an MCU or ASIC to enter a deterministic safe state when VCC sags or collapses during brownout, inrush, or power sequencing events. Key specifications of the TS831-4IZT include the 4.5V (TS831-4 series) factory threshold, 1.5 uA typical supply current, an open-drain RESET output (active-low) that requires an external pull-up resistor, and a 20 us typical comparator response time with 10 mV overdrive. The internal reference achieves 1.5% voltage accuracy across the -40C to +85C industrial temperature range, while the open-drain structure permits wired-OR reset logic across multiple rails or supervisors. Architecturally, the TS831 combines a high-stability bandgap reference with a precision comparator stage whose threshold is defined by on-chip, thermally-matched resistor dividers. This monolithic approach eliminates drift introduced by external divider components and guarantees that all TS831-4IZT units assert reset at the same VCC level. The open-drain output allows the user to pull up to any voltage up to 5.5V regardless of VCC, simplifying mixed-voltage reset signaling in designs where logic and MCU rails differ. Typical applications for the TS831-4IZT span 5V-tolerant microcontroller supervisor circuits (8051, MSP430, AVR, low-end Cortex-M0/M0+ devices), battery-powered equipment requiring ultra-low standby drain, embedded systems that need a deterministic reset during power-up and brownout, and industrial controls where a guaranteed reset signal improves safety and reliability. The micropower consumption also makes it well-suited for remote sensor nodes and energy-harvesting designs. When designing with this part, ensure the external pull-up resistor on the RESET pin is sized to meet the downstream logic's leakage and rise-time requirements without violating the part's open-drain sink current rating. A 100 kohm pull-up to VCC is typical for low-speed reset networks; faster MCU reset inputs often benefit from a 10 kohm pull-up. Place the TS831 as close as possible to the supply it monitors, and add a 100 nF decoupling capacitor adjacent to VCC for noise immunity on noisy industrial buses. This page consolidates distributor pricing, factory cross-reference alternatives, and practical design guidance not typically reproduced in the manufacturer datasheet - giving engineers a single decision-ready reference for selecting and sourcing the TS831-4IZT.
UCD90160ARGCT - 16-Rail PMBus Sequencer & Monitor | Texas Instruments
The Texas Instruments UCD90160ARGCT is a 16-rail PMBus/I2C addressable power supply sequencer and system health monitor with ACPI support, housed in a 64-pin VQFN (RGC) 9x9 mm package. It samples all 16 voltage rails every 400 µs using a 12-bit ADC with a 2.5 V, 0.5% internal reference, supports up to four programmable undervoltage and overvoltage thresholds per monitor, and operates from a 3 V to 3.6 V supply with typical quiescent current of 50 mA. A power supply sequencer is a programmable controller that supervises the turn-on and turn-off order, voltage margin, and fault response of multiple DC rails in a complex system such as a server, FPGA SoM, or ATX-class board. By centralizing rail sequencing in one IC rather than discrete reset supervisors, designers replace glue logic, RC delay chains, and multiple supervisor ICs with one PMBus-programmable device, simplifying BOM and improving diagnostic visibility through the integrated system health telemetry interface. Key features include sequence control based on time, rail-dependency, and pin-dependency, ACPI support for desktop power-button S0/S3/S5 state coordination, a 100-pin-compatible scalable family (UCD90120A / UCD90124A / UCD90910 / UCD90160), and integration with the TI Fusion Digital Power Designer GUI. Black-box fault logging, margining, and closed-loop trim of downstream DC/DC converters are standard capabilities supported through the PMBus command set. The device integrates a 12-bit ADC and precision reference, fault-logging non-volatile memory, programmable GPIOs for PERST#, ENABLE, and PG_OUT behavior, and a JTAG/I2C/PMBus host interface. The architecture follows the UCD90xxx family: an embedded microcontroller runs sequencing state machines while a dedicated ADC front-end maintains 400 µs rail sampling independent of host interaction. The result is deterministic rail sequencing even when the system host is stalled during fault recovery. Typical applications include ATX/Server power sequencing for multi-rail processors, FPGA and SoC power-up coordination, industrial and telecommunications equipment with hot-swap controllers, and automated test platforms that require precise rail ordering and margin verification. ACPI support makes the part particularly natural in x86 system designs that need S3 suspend/resume state transitions. When designing with this device, plan for a 3.3 V auxiliary rail present at all times because the sequencer must remain alive before the main rails come up. Place the decoupling capacitor network (1 µF + 0.1 µF) within 5 mm of the AVDD pin and follow TI's RGC PCB layout guideline in the EVM user's guide to keep ADC readings clean across all 16 channels. This page synthesizes distributor pricing, drop-in cross-reference parts, and practical layout notes compiled from the manufacturer datasheet and TI EVM user's guide so engineers can quickly qualify the UCD90160ARGCT against alternative sequencers in the same package family.
UCD90320ZWST - 32-Rail PMBus Power Sequencer & System Manager | TI
The Texas Instruments UCD90320ZWST is a 32-rail PMBus-addressable power sequencer and system manager housed in a 169-ball NFBGA package measuring 12 mm x 12 mm with a 0.8 mm ball pitch. The device integrates 24 ADC channels (AMONx) that monitor power supply voltage, current, and temperature, plus 84 GPIO pins that can be configured as 8 digital monitors (DMONx) and additional general-purpose I/O. It supports sequencing, margining, and supervising up to 24 voltage rails plus 8 digital rails in complex multi-rail systems such as FPGA, ASIC, and processor power trees. A power sequencer is a specialized supervisory IC that orchestrates the turn-on/turn-off order, timing, and fault response of multiple voltage rails. In the hierarchy of power-management ICs, sequencers sit above simple voltage supervisors (single-rail reset/watchdog) and below PMBus-configurable digital power controllers. They translate high-level system events into coordinated rail-by-rail actions using logic expressions, timers, and PMBus commands. The UCD90320 adds closed-loop monitoring, fault logging, and non-volatile configuration to that role. Key features include flexible sequence-on and sequence-off dependencies based on delay time, Boolean logic, and GPIO triggers; full OV/UV/OC/UC/temperature/time-out/GPI-triggered fault detection; pin-selected rail states for up to 8 user-defined power states using 3 GPIs (supporting ACPI low-power modes); cascade-capable FAULT pin for synchronized fault responses across multiple devices; and on-chip non-volatile memory for configuration storage. The PMBus interface supports standard command set plus TI extensions for sequencing and fault response. Architecturally, the UCD90320 combines a Cortex-M0-class configuration manager with a 24-channel sigma-delta ADC front end, a dedicated sequencing state machine, and an I2C/PMBus slave interface. The 0.8 mm-pitch BGA supports the high pin count required for 24 analog inputs, 84 GPIO, and PMBus/serial interface pins in a compact 12x12 mm outline. Typical applications include FPGA/ASIC power-rail sequencing and supervision, ATCA/telecom board power management, server and storage-system boot sequencing, industrial multi-rail power distribution, and ACPI-compliant low-power state coordination. Use the UCD90320 Fusion Digital Power Designer GUI for offline configuration and the TI USB-to-GPIO adapter for in-system programming. When designing, always allocate sufficient bulk capacitance on monitored rails and verify ADC input dividers against the 6 V full-scale range.
UCD9090 - 10-Rail Power Sequencer & Monitor | Texas Instruments
The Texas Instruments UCD9090 is a 10-rail PMBus/I2C addressable power-supply sequencer and monitor. It integrates a 12-bit ADC for monitoring up to 10 power-supply voltage inputs, and 23 GPIO pins can be used for power-supply enables, power-on reset signals, external interrupts, cascading, or other system functions. Ten of these pins offer PWM functionality, enabling flexible control of power rails. The device is available in a 48-pin VQFN (7x7) package, suitable for compact board designs. A power-supply sequencer and monitor is a specialized power management IC that controls the order in which multiple voltage rails are turned on and off during system startup and shutdown. This is critical in complex electronic systems where certain rails must be established before others to prevent latch-up, excessive current draw, or damage to sensitive components. The UCD9090 sits within the power management IC hierarchy, specifically under the category of sequencers and monitors, which are essential for reliable multi-rail power delivery in servers, networking equipment, and industrial systems. Key features of the UCD9090 include its 10-channel sequencing capability, 12-bit ADC for accurate voltage monitoring, and PMBus/I2C interface for configuration and telemetry. The device supports ACPI (Advanced Configuration and Power Interface) for advanced power management in computing systems. Its GPIO pins provide versatile control options, including PWM outputs for margining or dynamic voltage scaling. The UCD9090 is designed for high-reliability applications, with a wide operating temperature range and robust fault handling. Technically, the UCD9090 uses a digital state machine to manage sequencing sequences, which can be programmed via PMBus commands. The integrated ADC samples each rail's voltage and compares it against programmable thresholds, triggering faults if voltages exceed or fall below limits. The device can also log fault events and report them to a host controller. This architecture enables precise, repeatable power sequencing and monitoring, reducing the need for external supervisory circuits. Typical applications include server and storage systems, networking equipment, telecommunications infrastructure, and industrial control systems. In these applications, the UCD9090 ensures that power rails are sequenced correctly, preventing system failures and improving reliability. Its PMBus interface allows for real-time monitoring and control, making it ideal for systems that require dynamic power management. When designing with the UCD9090, it is important to configure the sequencing parameters and fault thresholds via PMBus to match the specific power-up requirements of the system. Proper decoupling and layout are essential to ensure accurate ADC readings and stable operation. The device's flexibility in GPIO assignment should be leveraged to optimize board layout and minimize signal routing complexity.
UCD9090RGZ - 10-Rail Sequencer/Monitor, 48-VQFN | Texas Instruments
The Texas Instruments UCD9090RGZ is a 10-rail PMBus/I2C-addressable power-supply sequencer and monitor with ACPI support, housed in a 48-pin VQFN (RGZ) package (7x7 mm). It integrates a 12-bit ADC that samples up to 10 voltage rails and eight general-purpose digital inputs (GPIs), making it a system-health monitoring companion for multi-rail designs based on point-of-load converters. A power supply sequencer is a dedicated supervisory IC that turns rails on and off in a defined order, monitors their health after start-up, and reacts to faults. In the broader hierarchy it sits between the PMBus-controlled point-of-load (POL) converters it commands and the system-level power management firmware running on the host. Devices such as the UCD9090RGZ replace discrete supervisory chains with a single programmable, telemetry-rich block that designers can reconfigure over PMBus without a board spin. Key features include per-rail margining, programmable under-voltage and over-voltage thresholds, fault logging in non-volatile memory, watchdog timer, and pin-selected low-power states via up to three GPIs (eight ACPI-style states). The on-board 2.5 V, 0.5% internal reference gives repeatable ADC-based rail measurements, while the 12-bit ADC provides 0.1% typical resolution across the 0 V-2.5 V range. ACPI support lets the device implement S0/S1/S3/S4/S5-style low-power modes for energy-aware systems. Architecturally, the UCD9090RGZ pairs an internal ARM7-class controller with the sequencer/monitor state machine. The host configures rails via PMBus commands; the on-chip sequencer then drives external PGOOD/ENABLE/MARGIN pins and reads back rail voltages through the muxed ADC. The 48-VQFN (RGZ) package provides adequate thermal headroom for the 3.3 V supply operation. Typical applications include FPGA/processor power sequencing in telecom and networking line cards, ATCA/AMC/ATX power rails in servers, industrial PLCs with multiple voltage domains, and any system requiring ACPI-style sleep state coordination. The UCD90SEQ48EVM-560 evaluation module accelerates bring-up using the UCD9090RGZ on a 48-pin socketed board with USB-to-PC GUI. When designing with this part, place the device close to the regulators it sequences to minimize the loop on the EN/MARGIN/PGOOD traces, and follow TI's recommended BUF layout for the 0.1 uF/1 uF/10 uF decoupling. The fault log, programmable GPI de-bounce, and per-rail fault-response policy should be configured in the Fusion Digital Power Designer GUI before production. This page consolidates distributor pricing, drop-in alternatives, and design notes not bundled into the manufacturer datasheet, giving engineers a faster path from selection to bring-up.
X5043M8I-2.7A - CPU Supervisor w/ 4K SPI EEPROM | Renesas
The Renesas (formerly Xicor / Intersil) X5043M8I-2.7A is a single-chip CPU supervisor that integrates four critical system functions into one 8-pin MSOP/TSSOP device: power-on reset control, a watchdog timer, supply voltage supervision, and a 4 Kbit block-locked serial EEPROM with an SPI interface. It provides 1 voltage monitor with a factory-trimmed threshold in the 2.7 V family, an active-low reset output in open-drain configuration, and a guaranteed minimum reset timeout of 100 ms. A CPU supervisor (also called a voltage supervisor or reset IC) is a dedicated power-management device that protects a microcontroller, ASIC, or DSP from the brown-out, power-glitch, and firmware-hang conditions that firmware alone cannot detect. Within the broader taxonomy it sits under supervisor and reset IC -> power management IC -> mixed-signal semiconductor. The supervisor's role in a system is to assert a deterministic reset until the supply rail is stable and within tolerance, then continue to monitor VCC and to service a watchdog window that proves the host CPU is still executing valid code. Key features include low VCC operation down to 1 V to support battery-backup EEPROM write, an internal oscillator that removes the need for an external timing component, hardware block-lock protection for the upper half of the EEPROM array via the WP pin, and selectable watchdog timeout options. The SPI serial interface runs at clock rates up to several MHz, suitable for firmware-parameter storage, board-strapping, and calibration tables. The integrated design reduces board area, BOM count, and software overhead compared with discrete supervisor + EEPROM solutions. The architecture combines a precision bandgap reference, a comparator chain for VCC monitoring, a watchdog counter clocked from an internal oscillator, and a high-EEPROM cell array accessed through a standard SPI slave port. The I2C-style three-wire interface uses SCLK, SO, SI, and CS, with the WP input gating writes to the protected memory quadrant. Typical applications include microcontroller reset and parameter storage in industrial controllers, secure boot sequencing in embedded modules, watchdog supervision in motor drives, and EEPROM-backed event logging in metering equipment. Designers choose the X5043M8I-2.7A when a 2.7 V-class reset threshold is required and a small MSOP-8 footprint is mandated. A key design consideration is decoupling: place a 0.1 uF bypass capacitor close to VCC, and observe the CS setup/hold timings for reliable SPI communication at maximum clock rates. The reset pin is open-drain and requires an external pull-up resistor. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the bare manufacturer datasheet.
X5325S8IZ-4.5A - CPU Supervisor with 32K SPI EEPROM, 4.5V | Renesas
The Renesas X5325S8IZ-4.5A is a CPU Supervisor with 32 kBit SPI EEPROM that integrates four essential system-management functions into a single 8-pin SOIC package: power-on reset control, programmable watchdog timer, supply voltage supervision, and block-lock-protected serial EEPROM memory. It is specified for a 4.5 V VCC trip threshold (VCC tolerance +/-10%), operates over the standard industrial temperature range, and offers an active-high reset output (RST) suitable for monitoring 5 V system rails. A CPU Supervisor (also called a voltage supervisor, reset IC, or power-supply monitor) is a mixed-signal IC that safeguards a microcontroller, microprocessor, or DSP by monitoring its supply rail and asserting a reset during brown-out, power-up, and power-down events. This category sits within the PMIC (Power Management IC) hierarchy: supervisor -> PMIC -> power management -> semiconductor. By combining an EEPROM with the supervisor, the X5325 reduces part count, board area, and BOM cost in designs that otherwise need a standalone EEPROM for configuration, calibration, or parameter storage. Key features include a precision VCC voltage detector with 4.5 V nominal trip point, a programmable watchdog timer with selectable time-out, an open-drain / open-collector reset output, SPI (Serial Peripheral Interface) bus access up to 5 MHz for the 32 kbit (4 kbyte) EEPROM, and software-controllable block-lock protection that prevents accidental writes to protected memory regions. The Z suffix indicates the Pb-free (lead-free) finish and the I suffix denotes the industrial temperature grade (-40 C to +85 C). Internally, the X5325S8IZ-4.5a pairs an analog voltage reference and comparator (for VCC monitoring) with a state machine that drives the reset pin and watchdog logic, alongside a separate SPI slave with embedded EEPROM. The 32 kbit EEPROM uses a 4 kbyte organization and supports page-write mode for efficient parameter updates. Block-lock protection prevents rogue firmware from corrupting calibration constants stored in protected sectors, which is critical in safety-relevant designs such as industrial PLCs and appliance controllers. Typical applications include 8051 / ARM Cortex-M0 boot-monitoring in white goods, HVAC controllers, set-top boxes, and any 5 V MCU platform needing tamper-safe parameter storage (e.g., trim settings, serial numbers, runtime hours). The wide VCC tolerance also makes it suitable for 5 V +/-10% industrial 24 V-bus-derived rails. Choose this part when a low-pin-count supervisor plus serial EEPROM in one IC simplifies layout and lowers cost versus a discrete supervisor + standalone EEPROM solution. When designing with this device, place a 0.1 uF decoupling capacitor close to VCC and keep SPI lines short to prevent ringing at 5 MHz. Reset pull-up resistor selection affects rise time - a 10 kohm to 100 kohm range typically balances current draw with rise-time. For in-system EEPROM writes, ensure VCC remains within the data-retention range or block writes with the watchdog-induced reset. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical supervisor design notes not found in the standalone manufacturer datasheet alone.