Analog Devices Inc. ADM809SAKSZ-REEL7

Overview

ADM809SAKSZ-REEL7 from Analog Devices is a microprocessor supervisory circuit with push-pull active-low RESET output, 2.93 V reset threshold, −40°C to +125°C operating range, 17 μA supply current, and 240 ms typical reset timeout-used to ensure reliable power-on initialization in embedded controllers and industrial instrumentation.

For engineers reviewing the ADM809SAKSZ-REEL7 datasheet, ADM809SAKSZ-REEL7 pinout, ADM809SAKSZ-REEL7 application, or ADM809SAKSZ-REEL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), low-voltage operation down to 1 V VCC, glitch-immune comparator, SC70-3 package footprint, and compatibility with 3 V microprocessor systems requiring deterministic reset assertion.

Technical Context

The ADM809SAKSZ-REEL7 integrates a precision voltage reference and comparator to monitor VCC against a fixed 2.93 V threshold, asserting RESET low when VCC falls below that level. Its internal timer guarantees a minimum 140 ms (typical 240 ms) reset pulse width after power-up, independent of external components.

It features built-in glitch immunity for transients up to 100 mV overdrive, operates with VCC as low as 1.0 V, and delivers push-pull logic-level RESET compatible with standard CMOS inputs-eliminating need for external pull-up resistors unlike open-drain variants.

Key Specifications

Pinout & Package

ADM809SAKSZ-REEL7 uses a 3-lead SC70 (KS-3) package, measuring 2.00 mm × 1.25 mm × 0.9 mm, with gull-wing leads and JEDEC-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SASD+T and TPS3808G12QDBVRQ1, ADM809SAKSZ-REEL7 offers superior temperature coverage (−40°C to +125°C), fixed-pinout simplicity (no external resistors), and proven field reliability in industrial instrumentation-making it optimal where deterministic reset timing and extended thermal performance outweigh minimal IQ savings or automotive certification needs.

Availability

ADM809SAKSZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM809SAKSZ-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 ADM809 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for deterministic power-on reset generation in harsh-environment embedded systems where reliability, precision, and low power are non-negotiable.

FAQ

What is the exact reset threshold voltage of ADM809SAKSZ-REEL7 and how does it vary with temperature?

The ADM809SAKSZ-REEL7 has a nominal reset threshold of 2.93 V, with tolerance of ±2.5% over the full −40°C to +125°C operating range. At 25°C, the threshold is 2.93 V (typ), and it shifts by only 30 ppm/°C - resulting in ±6 mV drift across the entire temperature span. This stability is confirmed in Table 1 and Figure 9 of the Rev. I datasheet.

Does ADM809SAKSZ-REEL7 require an external pull-up resistor on the RESET pin?

No, ADM809SAKSZ-REEL7 does not require an external pull-up resistor because it features a push-pull RESET output. Unlike the open-drain ADM803 variant, the ADM809SAKSZ-REEL7 actively drives both high and low logic states - delivering 0.3 V low at 1.2 mA sink and 0.8×VCC high at 500 μA source per the datasheet specifications.

What is the minimum VCC voltage at which ADM809SAKSZ-REEL7 continues to assert RESET?

ADM809SAKSZ-REEL7 continues to assert RESET (hold low) down to VCC = 1.0 V, as specified in the "VCC OPERATING VOLTAGE RANGE" row of Table 1. Below 1.0 V, the internal circuitry ceases to function reliably - but this 1.0 V limit ensures fail-safe reset behavior well into brownout conditions common in battery-backed or unregulated supplies.

Is ADM809SAKSZ-REEL7 RoHS compliant and what package does it use?

Yes, ADM809SAKSZ-REEL7 is RoHS compliant (denoted by the "Z" suffix per Ordering Guide footnote 1). It uses a 3-lead SC70 package (JEDEC KS-3), with dimensions 2.00 mm × 1.25 mm × 0.9 mm and gull-wing leads - verified in Figure 15 and the Ordering Guide entry for ADM809SAKSZ-REEL7.

How does the reset timeout of ADM809SAKSZ-REEL7 behave across temperature and supply voltage?

The reset timeout of ADM809SAKSZ-REEL7 is internally timed and remains stable across temperature and supply voltage: 240 ms typical, with min/max of 140–460 ms over −40°C to +85°C and 100–840 ms over +85°C to +125°C. This variation is fully characterized in Table 1 and Figure 8, and no external capacitor or adjustment is needed - the timing is factory-trimmed and process-compensated.