Analog Devices Inc. ADM809LAKS-REEL7

Overview

ADM809LAKS-REEL7 from Analog Devices is a microprocessor supervisory circuit in 3-lead SC70 package, providing push-pull active-low RESET output with 4.63 V threshold, 240 ms typical reset timeout, and operation down to 1.0 V VCC. It monitors power supply integrity during power-up, brownout, and power-down in embedded controllers and industrial instrumentation.

For engineers reviewing the ADM809LAKS-REEL7 datasheet, ADM809LAKS-REEL7 pinout, ADM809LAKS-REEL7 application, or ADM809LAKS-REEL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), low 17 μA quiescent current, glitch-immune comparator, and compatibility with 3 V/5 V logic interfaces without external pull-up.

Technical Context

The ADM809LAKS-REEL7 integrates a precision voltage reference and comparator to detect VCC falling below 4.63 V (typical), asserting RESET until VCC rises above threshold and remains stable for 240 ms (typical). Its internal timer ensures deterministic reset timing independent of external components.

Designed for high-reliability monitoring, it features built-in glitch immunity against fast VCC transients up to 100 V/μs and maintains valid RESET assertion down to VCC = 1.0 V - enabling robust operation during deep brownouts.

Key Specifications

Pinout & Package

ADM809LAKS-REEL7 uses a 3-lead SC70 (KS-3) package, 1.8 mm × 1.2 mm footprint, 0.65 mm lead pitch, with gull-wing leads and JEDEC-compliant dimensions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX809LUR+T and TPS3808G15DBVR, ADM809LAKS-REEL7 delivers superior high-temperature operation (+125°C), smallest PCB area (SC70), and guaranteed glitch immunity - making it optimal for space-constrained industrial and automotive modules where reliability under thermal stress is critical.

Availability

ADM809LAKS-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body electronics, and medical patient monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM809LAKS-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM809LAKS-REEL7 belongs to Analog Devices' microprocessor supervisory IC family, engineered specifically for deterministic power-on reset generation and brownout protection in safety-critical embedded systems.

FAQ

What is the reset threshold voltage of the ADM809LAKS-REEL7?

The ADM809LAKS-REEL7 has a nominal reset threshold voltage of 4.63 V, with tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. This value is factory-trimmed and specified in Table 1 and Table 3 of the ADM803/ADM809/ADM810 datasheet Rev. I. The threshold remains stable across VCC variations and ensures reliable detection of 5 V supply faults before system-level failure occurs. ADM809LAKS-REEL7 maintains this accuracy without external calibration components.

Does the ADM809LAKS-REEL7 require an external pull-up resistor on the RESET pin?

No, the ADM809LAKS-REEL7 features a push-pull RESET output, unlike the open-drain ADM803 series. It actively drives both high and low logic states without needing an external pull-up resistor. When RESET is asserted (low), it sinks up to 3.2 mA with V_OL ≤ 0.4 V; when deasserted (high), it sources current with V_OH ≥ 0.8×VCC. This simplifies PCB layout and reduces component count compared to open-drain alternatives. ADM809LAKS-REEL7 is fully compatible with standard CMOS and TTL inputs.

What is the minimum VCC voltage at which ADM809LAKS-REEL7 continues to assert RESET?

The ADM809LAKS-REEL7 continues to assert RESET down to VCC = 1.0 V, as confirmed in the "VCC OPERATING VOLTAGE RANGE" specification (Table 1, Rev. I datasheet). Below this voltage, the internal circuitry ceases to function reliably, but the device guarantees valid logic levels on RESET throughout the 1.0 V to 5.5 V operating range. This capability enables controlled shutdown sequencing in systems where auxiliary rails remain active longer than the main 5 V supply. ADM809LAKS-REEL7's behavior is explicitly characterized down to 1.0 V - not extrapolated.

Is the ADM809LAKS-REEL7 RoHS compliant?

Yes, the ADM809LAKS-REEL7 is RoHS compliant, as indicated by the "Z" suffix in its ordering code per the manufacturer's Ordering Guide (Rev. I, Page 10). It meets EU Directive 2011/65/EU and is lead-free with matte tin lead finish. The part is marked with "XX" on the bottom per RoHS marking convention, and packaging complies with J-STD-020 moisture sensitivity level 1. ADM809LAKS-REEL7 is suitable for green manufacturing and export to regulated markets without restriction.

How does the ADM809LAKS-REEL7 handle fast transients on the VCC line?

The ADM809LAKS-REEL7 incorporates a glitch-immune reset comparator designed to reject fast VCC transients up to 100 V/μs, as verified in Figure 11 of the datasheet. Its internal architecture filters short-duration overdrive events (e.g., ESD-induced spikes or switching noise) that would otherwise trigger false resets. Transient rejection is quantified by maximum allowable duration versus comparator overdrive (V_TH − V_CC). This feature ensures reliable operation in electrically noisy environments like automotive or industrial motor-control systems. ADM809LAKS-REEL7's immunity is inherent - no external RC filtering is required.