Analog Devices Inc. ADM1086AKSZ-REEL7

Overview

ADM1086AKSZ-REEL7 from Analog Devices is a push-pull output power supply sequencer IC used to control enable timing between voltage regulators in multi-rail systems. It features 0.6 V input threshold detection, capacitor-adjustable delay (35 μs base + up to milliseconds), 15 μA supply current, and operates from −40°C to +125°C in a 6-lead SC70 package. It is deployed in server power sequencing where precise staggered regulator turn-on prevents inrush current and rail collapse.

For engineers reviewing the ADM1086AKSZ-REEL7 datasheet, ADM1086AKSZ-REEL7 pinout, ADM1086AKSZ-REEL7 application, or ADM1086AKSZ-REEL7 equivalent, key selection criteria include its push-pull ENOUT stage (no external pull-up required), VIN monitoring down to 0.6 V, ±15 mV hysteresis, 0.5 μs ENIN-to-ENOUT propagation delay, and compatibility with high-voltage enable inputs up to 22 V.

Technical Context

The ADM1086AKSZ-REEL7 implements a comparator-based voltage monitor with internal 0.6 V reference and hysteresis, coupled to a 250 nA CEXT charge circuit that sets programmable delay before asserting ENOUT. Its push-pull output stage integrates PMOS/NMOS drivers, enabling direct logic-level interfacing without external components.

It functions as an AND gate between VIN (above VTH_RISING) and ENIN (active-high), with delay applied only on VIN rising edge. The device supports cascaded sequencing via ENOUT-to-ENIN daisy-chaining and tolerates VIN/ENIN voltages up to 22 V while operating from 2.25 V to 3.6 V VCC.

Key Specifications

Pinout & Package

ADM1086AKSZ-REEL7 is housed in a 6-lead SC70 (KS-6) package, measuring 2.20 mm × 1.35 mm × 0.90 mm, with 0.65 mm lead pitch and JEDEC MO-203-AB compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power supply sequencing applications.

Compared with ADM1085AKSZ-REEL7, ADM1086AKSZ-REEL7 eliminates external pull-up components and simplifies layout, while TPS3808G33DBVR trades sequencing flexibility for integrated reset timing and watchdog functionality-neither serves as a functional replacement without circuit redesign.

Availability

ADM1086AKSZ-REEL7 is available at Aetrix Electronics and suitable for server motherboard design, telecom line card development, and industrial PLC power management requiring stable component supply and long-term lifecycle support.

Supply support for ADM1086AKSZ-REEL7 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and communications infrastructure.

The ADM108x Simple Sequencers product line was designed specifically for deterministic, low-power, capacitor-programmable power supply sequencing in space-constrained, thermally demanding multi-rail systems-targeting servers, networking gear, and embedded computing.

FAQ

What is the minimum detectable input voltage for ADM1086AKSZ-REEL7?

The ADM1086AKSZ-REEL7 has a fixed 0.6 V internal reference with ±40 mV tolerance, enabling reliable detection of monitored voltages as low as 0.6 V. This is achieved via resistor divider scaling on the VIN pin-no external amplification is needed, making it suitable for modern low-voltage rails like 1.2 V, 1.0 V, or 0.85 V when properly biased.

Does ADM1086AKSZ-REEL7 require an external pull-up resistor on ENOUT?

No. ADM1086AKSZ-REEL7 uses a push-pull (CMOS) output stage, so ENOUT actively drives both high and low states without external components. This contrasts with the open-drain ADM1085/ADM1087 variants, which require pull-up resistors. The ADM1086AKSZ-REEL7's ENOUT can source up to 500 μA and sink up to 1.2 mA at VCC = 3.3 V.

How is the time delay programmed on ADM1086AKSZ-REEL7?

The time delay is set by connecting an external capacitor to the CEXT pin. The delay follows t_EN = (C × 4.8×10⁶) + 35 μs, where C is in farads. For example, a 470 pF capacitor yields ~2.3 ms total delay. The internal 250 nA current source charges CEXT; no trimming or calibration is required-only capacitor selection determines timing.

Can ADM1086AKSZ-REEL7 monitor a 12 V supply directly?

Yes. The VIN pin tolerates up to 22 V, so a 12 V supply can be monitored directly using a resistor divider to scale it down to ≤0.64 V at VIN. With R1 = 18.7 kΩ and R2 = 1 kΩ, 12 V becomes 0.606 V-within the specified 0.56 V to 0.64 V rising threshold window at VCC = 3.3 V. No additional protection circuitry is needed.

What is the maximum allowable voltage on the ENIN pin of ADM1086AKSZ-REEL7?

The ENIN pin is rated for −0.3 V to +25 V per Absolute Maximum Ratings, and functions correctly up to +22 V under normal operation. This allows direct connection to higher-voltage control signals (e.g., 5 V, 12 V, or 24 V logic) without level shifters-critical for interfacing with legacy power modules or industrial PLC outputs.