Analog Devices Inc. ADM2914-2ARQZ-RL7

Overview

ADM2914-2ARQZ-RL7 from Analog Devices is a quad UV/OV voltage supervisor IC designed to monitor up to four independent power rails-including two negative supplies-for simultaneous undervoltage and overvoltage faults. It features ±1.5% threshold accuracy over −40°C to +125°C, 1 V buffered reference output (REF), open-drain UV/OV reset outputs, adjustable reset timeout via external capacitor, and a dedicated DIS pin for overriding both reset signals. It is deployed in FPGA/DSP core-I/O monitoring and telecom server supply supervision.

For engineers reviewing the ADM2914-2ARQZ-RL7 datasheet, ADM2914-2ARQZ-RL7 pinout, ADM2914-2ARQZ-RL7 application, or ADM2914-2ARQZ-RL7 equivalent, key selection considerations include its dual-polarity rail support (enabled by SEL pin), disable-controlled reset assertion, 62 μA quiescent current, 16-lead QSOP package, and guaranteed operation down to VCC = 1 V.

Technical Context

The ADM2914-2ARQZ-RL7 implements four independent comparator pairs (VHx/VLx per rail), each referenced to a precision 500 mV internal threshold with ±1.5% accuracy across temperature. Its three-state SEL pin configures polarity for inputs VH3/VL3/VH4/VL4-supporting positive, negative, or mixed-rail monitoring using the same resistor-divider topology.

Unlike the latch-based ADM2914-1, the ADM2914-2ARQZ-RL7 uses a dedicated DIS input to force both UV and OV outputs high regardless of input conditions-except during VCC undervoltage lockout (UVLO at 1.9–2.1 V). Reset timeout is externally programmable (6–14 ms) via TIMER pin capacitance, and the 1 V REF output serves as offset for negative-rail sensing circuits.

Key Specifications

Pinout & Package

ADM2914-2ARQZ-RL7 is housed in a 16-lead QSOP package (3.9 mm × 4.9 mm, 1.0 mm height) with standard gull-wing leads and 0.635 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage supervisor applications.

Compared with ADM2914-1ARQZ-RL7 and TPS3307-33DGNR, the ADM2914-2ARQZ-RL7 uniquely combines quad-rail supervision, configurable polarity, disable-controlled reset, and integrated 1 V reference - making it the only option supporting mixed positive/negative rail monitoring with active reset inhibition in a single 16-pin QSOP.

Availability

ADM2914-2ARQZ-RL7 is available at Aetrix Electronics and suitable for server supply monitoring, FPGA/DSP core-I/O voltage supervision, and telecommunications equipment requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for ADM2914-2ARQZ-RL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The ADM2914 product line delivers precision multi-rail voltage supervision with configurable polarity and robust reset timing - engineered specifically for complex power architectures in telecom infrastructure, medical electronics, and high-end computing.

FAQ

What is the function of the DIS pin on the ADM2914-2ARQZ-RL7?

The DIS (Disable) pin on the ADM2914-2ARQZ-RL7 is an active-high input that forces both UV and OV outputs high, overriding all monitored rail conditions. This feature allows system-level control of reset assertion during firmware updates or maintenance. When DIS is pulled high, ADM2914-2ARQZ-RL7 ignores VHx/VLx inputs - except during VCC undervoltage lockout below 1.9 V, where UV/OV remain asserted regardless of DIS state.

How does the ADM2914-2ARQZ-RL7 support negative voltage monitoring?

The ADM2914-2ARQZ-RL7 supports negative rail monitoring using its 1 V buffered REF output as an offset reference and the three-state SEL pin to configure polarity for VH3/VL3/VH4/VL4. When SEL is tied to GND, those inputs interpret rising voltages above 0.5 V as undervoltage (for negative rails) and falling voltages below 0.5 V as overvoltage. The REF pin connects to the high side of the resistor divider, enabling accurate threshold translation for rails such as −12 V or −48 V.

What is the minimum VCC voltage required for ADM2914-2ARQZ-RL7 to assert valid UV/OV outputs?

The ADM2914-2ARQZ-RL7 guarantees functional UV/OV output behavior down to VCC = 1 V. At this level, the UV output is actively asserted low while OV pulls high. However, full comparator operation (i.e., responsive monitoring of VHx/VLx inputs) begins only when VCC exceeds the undervoltage lockout threshold of 1.9–2.1 V. Below that, the device remains in UVLO state and ignores input conditions.

Can the ADM2914-2ARQZ-RL7 monitor four rails simultaneously with different polarities?

Yes - the ADM2914-2ARQZ-RL7 can monitor four rails with mixed polarity: VH1/VL1 and VH2/VL2 are fixed for positive-rail monitoring, while VH3/VL3 and VH4/VL4 polarity is determined by the SEL pin state (GND = negative, VCC = positive, open = mixed). This allows configurations such as two positive rails (e.g., 3.3 V, 1.2 V), one negative rail (e.g., −12 V), and one positive rail (e.g., 5 V) - all supervised concurrently by a single ADM2914-2ARQZ-RL7.

What capacitor value is needed to achieve an 8.5 ms reset timeout on the ADM2914-2ARQZ-RL7?

To achieve an 8.5 ms UV/OV timeout period on the ADM2914-2ARQZ-RL7, a 1 nF capacitor must be connected between the TIMER pin and GND. This value is specified in the datasheet (Table 1, tUOTO = 6–12.5 ms at CTIMER = 1 nF, typical 8.5 ms). The relationship is linear: tUOTO ≈ 115 × CTIMER (with CTIMER in farads), so 1 nF yields ~115 μs × 10⁹ = 115 ms - corrected per datasheet Figure 15 and Table 1, the actual calibrated value is 1 nF for 8.5 ms typical.