Analog Devices Inc. ADM809ZAKS-REEL7

Overview

ADM809ZAKS-REEL7 from Analog Devices is a microprocessor supervisory circuit with push-pull active-low RESET output, 2.32 V reset threshold (±0.07 V over −40°C to +125°C), 17 μA supply current, and 240 ms typical reset timeout. It monitors 2.5 V supply rails in embedded controllers and industrial instrumentation where brownout immunity and low-power operation are critical.

For engineers reviewing the ADM809ZAKS-REEL7 datasheet, ADM809ZAKS-REEL7 pinout, ADM809ZAKS-REEL7 application, or ADM809ZAKS-REEL7 equivalent, key selection factors include its guaranteed reset assertion down to 1 V VCC, SC70-3 package footprint, −40°C to +125°C operating range, and compatibility with 2.5 V logic interfaces requiring active-low push-pull reset signaling.

Technical Context

The ADM809ZAKS-REEL7 implements a precision bandgap voltage reference and comparator to detect VCC falling below 2.32 V, with built-in glitch immunity against transients up to 100 mV overdrive. Its internal timer ensures minimum 140 ms (typical 240 ms) reset pulse width after power-up.

It features push-pull output capable of sinking 1.2 mA at 0.3 V (VCC = VTH min) and sourcing 500 μA at 0.8×VCC, eliminating need for external pull-up resistors. The device remains functional with VCC as low as 1.0 V, enabling robust reset generation during deep brownouts.

Key Specifications

Pinout & Package

ADM809ZAKS-REEL7 is housed in a 3-lead SC70 (KS-3) package with 0.65 mm lead pitch, 0.1 mm coplanarity, and JEDEC-compliant dimensions (2.20 mm × 1.35 mm × 0.95 mm height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809ZTR and TPS3808G125DBVR, ADM809ZAKS-REEL7 offers superior thermal performance in SC70-3, precise 2.32 V threshold matching 2.5 V supplies without external components, and optimal balance of reset timing, current consumption, and package size for high-reliability embedded systems.

Availability

ADM809ZAKS-REEL7 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM809ZAKS-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, headquartered in Norwood, MA.

The ADM809 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for reliable power monitoring and reset generation in harsh-environment embedded systems demanding precision, low power, and wide temperature operation.

FAQ

What is the exact reset threshold voltage of ADM809ZAKS-REEL7 and how does it vary with temperature?

The ADM809ZAKS-REEL7 has a nominal reset threshold of 2.32 V at 25°C, with guaranteed range of 2.25 V to 2.38 V over −40°C to +85°C and 2.22 V to 2.42 V over −40°C to +125°C. This 2.32 V value is selected to provide 3% margin below a standard 2.5 V supply, ensuring reset assertion before system-level functionality degrades. The device's 30 ppm/°C temperature coefficient contributes to tight overall tolerance.

Does ADM809ZAKS-REEL7 require an external pull-up resistor on the RESET pin?

No, ADM809ZAKS-REEL7 does not require an external pull-up resistor because it features a push-pull RESET output. Unlike open-drain variants such as the ADM803, the ADM809ZAKS-REEL7 actively drives both high and low states: it sinks current when RESET is asserted (low) and sources current when deasserted (high). This eliminates external components and simplifies interface to microprocessor reset inputs.

What is the minimum VCC voltage at which ADM809ZAKS-REEL7 continues to assert RESET?

The ADM809ZAKS-REEL7 guarantees RESET assertion down to VCC = 1.0 V across its full operating temperature range (−40°C to +125°C). Below 1.0 V, the internal circuitry ceases to function reliably. This capability ensures robust reset generation during severe brownout conditions where other supervisors may release reset prematurely, preventing unintended microprocessor execution.

Can ADM809ZAKS-REEL7 be used to monitor a 3.3 V supply?

No, ADM809ZAKS-REEL7 is not suitable for monitoring a 3.3 V supply because its fixed 2.32 V reset threshold is optimized for 2.5 V rails. Using it on 3.3 V would result in immediate and continuous reset assertion. For 3.3 V monitoring, select ADM809TAKSZ-REEL7 (3.08 V threshold) or ADM809SAKSZ-REEL7 (2.93 V threshold), both of which provide appropriate margin for 3.3 V ±5% or ±10% supplies.

What package type and dimensions does ADM809ZAKS-REEL7 use?

ADM809ZAKS-REEL7 uses a 3-lead SC70 package (JEDEC KS-3), measuring 2.20 mm × 1.35 mm × 0.95 mm with 0.65 mm lead pitch. Its compact footprint occupies approximately 40% less board area than equivalent SOT-23-3 devices, making it ideal for space-constrained applications like portable medical sensors and smart meter modules where PCB real estate is at a premium.