Analog Devices Inc. ADM12914-1ARQZ-RL7

Overview

ADM12914-1ARQZ-RL7 from Analog Devices is a quad UV/OV voltage supervisor IC for precision monitoring of up to four positive or negative supply rails. It delivers ±0.8% threshold accuracy over −40°C to +125°C, features 1 V buffered REF output, open-drain UV/OV reset outputs, and adjustable reset timeout via external capacitor. Used in FPGA core/I/O rail supervision and telecom power integrity systems.

For engineers reviewing the ADM12914-1ARQZ-RL7 datasheet, ADM12914-1ARQZ-RL7 pinout, ADM12914-1ARQZ-RL7 application, or ADM12914-1ARQZ-RL7 equivalent, key selection criteria include latching OV behavior, negative rail supervision capability via SEL-configurable inputs, 62 µA quiescent current, and QSOP-16 package compatibility with high-density server PCB layouts.

Technical Context

The ADM12914-1ARQZ-RL7 implements four independent comparator pairs (VHx/VLx), each referenced to a precision 500 mV internal threshold with ±0.8% accuracy across temperature. Its SEL pin configures VH3/VL3/VH4/VL4 for positive or negative polarity monitoring, enabling dual-rail supervision using a single 1 V REF offset.

It integrates a 6.6 V shunt regulator on VCC for operation above 6 V (with dropper resistor), guarantees UV/OV output assertion down to VCC = 0.9 V, and provides glitch-immune timing with 7.5–10.5 ms programmable timeout via TIMER pin capacitor. The LATCH pin enables manual clearing of latched OV output.

Key Specifications

Pinout & Package

ADM12914-1ARQZ-RL7 is housed in a 16-lead QSOP package (3.9 mm × 4.9 mm, 1.0 mm height), RoHS-compliant and rated for −40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM12914-2ARQZ-RL7 and TPS3307-18DGNR, ADM12914-1ARQZ-RL7 uniquely combines quad supervision, ±0.8% accuracy, negative rail capability, and latched OV-making it irreplaceable in high-integrity multi-rail systems where fault persistence and precision margining are mandatory.

Availability

ADM12914-1ARQZ-RL7 is available at Aetrix Electronics and suitable for server supply monitoring, FPGA/DSP core and I/O voltage monitoring, and telecommunications equipment requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ADM12914-1ARQZ-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 ADM12914 product line delivers precision, multi-rail voltage supervision for mission-critical power integrity in datacenter, telecom, and medical systems-designed specifically for applications demanding ±0.8% threshold accuracy and negative rail visibility.

FAQ

What is the key functional difference between ADM12914-1ARQZ-RL7 and ADM12914-2ARQZ-RL7?

The ADM12914-1ARQZ-RL7 features a latching OV output cleared only by toggling the LATCH pin, while the ADM12914-2ARQZ-RL7 substitutes a DIS pin that disables both UV and OV outputs when driven high. This makes ADM12914-1ARQZ-RL7 appropriate for fault-hold applications like medical imaging, whereas ADM12914-2ARQZ-RL7 suits systems needing coordinated reset disable during low-power modes. Both share identical pinout, accuracy, and supervision architecture.

How does ADM12914-1ARQZ-RL7 supervise negative voltage rails such as −5 V?

The ADM12914-1ARQZ-RL7 supervises negative rails using its 1 V buffered REF output as an offset reference and the three-state SEL pin to configure VH3/VL3/VH4/VL4 polarity. For a −5 V rail, REF connects to the high side of a resistor divider, and the −5 V rail connects to the low side; VH4 and VL4 then detect undervoltage (when −5 V becomes less negative than −4.575 V) and overvoltage (when more negative than −5.425 V), respectively-no external components beyond the divider are required.

What is the minimum and maximum VCC supply voltage for reliable operation of ADM12914-1ARQZ-RL7?

The ADM12914-1ARQZ-RL7 operates reliably from VCC = 2.3 V to 6.0 V directly. Above 6.0 V, its internal 6.6 V shunt regulator engages-requiring a series dropper resistor to limit VCC current to ≤10 mA. The device guarantees UV/OV output functionality down to VCC = 0.9 V, and its supply undervoltage lockout activates at VCC(UVLO) = 2.0 V (±30 mV hysteresis), ensuring predictable reset behavior during brownout conditions.

Can ADM12914-1ARQZ-RL7 monitor four independent positive rails without using the REF pin?

Yes. ADM12914-1ARQZ-RL7 can monitor four positive rails (e.g., +1.0 V, +1.8 V, +3.3 V, +5.0 V) using VH1/VL1 through VH4/VL4 with SEL tied to VCC. In this configuration, REF remains unused and may be left unconnected. Each rail uses a dedicated resistor divider to scale its voltage to the 0.5 V internal comparator threshold, and all four UV/OV events drive the common open-drain UV and OV outputs-fully leveraging the quad supervision capability without REF involvement.

What capacitor value on the TIMER pin yields an 8.5 ms UV/OV timeout for ADM12914-1ARQZ-RL7?

A 1 nF capacitor connected between the TIMER pin and GND yields a nominal 8.5 ms UV/OV timeout period for ADM12914-1ARQZ-RL7, per the datasheet's tUOTO specification and Figure 15. The relationship is linear: CTIMER (F) = tUOTO (s) × 1.15 × 10⁻⁹. For example, a 2.2 nF capacitor produces ~19 ms timeout. Capacitor leakage must be <1.7 µA, and values below 10 pF are not recommended due to noise sensitivity.