Analog Devices Inc. ADM809SAKS-REEL7

Overview

ADM809SAKS-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 temperature range, 17 μA supply current, and SC70-3 package. It monitors VCC in embedded controllers and ensures reliable power-on reset assertion for 240 ms (typical) during microprocessor startup.

For engineers reviewing the ADM809SAKS-REEL7 datasheet, ADM809SAKS-REEL7 pinout, ADM809SAKS-REEL7 application, or ADM809SAKS-REEL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), low-voltage operation down to 1 V VCC, glitch-immune comparator design, and compatibility with 3 V microcontroller I/O logic levels.

Technical Context

The ADM809SAKS-REEL7 implements a precision bandgap voltage reference and comparator architecture to detect VCC drops below 2.93 V (typical), with ±2.5% tolerance across −40°C to +125°C. Its internal 240 ms reset timeout timer is temperature-stable and independent of external components.

It features built-in glitch immunity against fast VCC transients up to 100 V/μs, and its push-pull RESET output drives high to VCC − 1.5 V (at 800 μA) and low to 0.4 V (at 3.2 mA), eliminating need for external pull-up resistors unlike open-drain variants.

Key Specifications

Pinout & Package

ADM809SAKS-REEL7 uses a 3-lead SC70 (KS-3) package with 0.65 mm lead pitch, 0.10 mm coplanarity, and JEDEC-compliant outline per Figure 15.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SASENS-T and TPS3808G33DBVR, the ADM809SAKS-REEL7 provides tighter threshold accuracy (±2.5% vs ±3.5%), guaranteed 240 ms typical timeout, and SC70-3 packaging for space-constrained designs-making it optimal for high-reliability 3 V microcontroller supervision where precise brownout detection is critical.

Availability

ADM809SAKS-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM809SAKS-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 measurement and control applications.

The ADM809 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for robust, low-power voltage monitoring and reset generation in harsh-environment embedded systems.

FAQ

What is the exact reset threshold voltage of the ADM809SAKS-REEL7 and how does it vary with temperature?

The ADM809SAKS-REEL7 has a nominal reset threshold of 2.93 V at 25°C, with a guaranteed range of 2.85 V to 3.00 V over −40°C to +85°C and 2.81 V to 3.05 V over −40°C to +125°C. This ±2.5% tolerance ensures reliable reset assertion before 3 V microcontrollers lose functional integrity, and the 30 ppm/°C temperature coefficient minimizes drift across operating conditions. The ADM809SAKS-REEL7 maintains this specification without external calibration.

Does the ADM809SAKS-REEL7 require an external pull-up resistor on the RESET pin?

No, the ADM809SAKS-REEL7 features a push-pull RESET output, unlike the open-drain ADM803. It actively drives high (to VCC − 1.5 V at 800 μA) and low (to ≤0.4 V at 3.2 mA), eliminating the need for an external pull-up resistor. This reduces component count and improves noise immunity in noisy industrial environments. The ADM809SAKS-REEL7 is fully compatible with standard CMOS and TTL input thresholds without additional biasing.

What is the minimum VCC voltage at which the ADM809SAKS-REEL7 can still assert a valid RESET signal?

The ADM809SAKS-REEL7 guarantees valid RESET assertion down to VCC = 1.0 V, as specified in the Absolute Maximum Ratings and confirmed in the General Description. Below 1.0 V, the output may become indeterminate; however, at 1.0 V, the device continues to sink 3.2 mA while holding RESET low. This capability enables early brownout detection well before most 3 V microcontrollers (which typically require ≥1.65 V) cease operation. The ADM809SAKS-REEL7 remains functional across its entire 1.0 V to 5.5 V VCC range.

How does the ADM809SAKS-REEL7 handle fast voltage transients on the VCC line?

The ADM809SAKS-REEL7 incorporates a glitch-immune reset comparator rated to reject transients up to 100 V/μs on the VCC pin, as verified in Figure 11 of the datasheet. This design prevents false resets caused by switching noise, ESD coupling, or load-step events. Transient rejection is achieved through internal filtering and hysteresis, not external capacitors. For the ADM809SAKS-REEL7, this means reliable operation in electrically noisy environments such as automotive or industrial motor-control systems without added protection circuitry.

Is the ADM809SAKS-REEL7 RoHS compliant and what is its packaging format?

Yes, the ADM809SAKS-REEL7 is RoHS compliant, indicated by the "Z" suffix in the part number per the Ordering Guide. It is supplied in tape-and-reel format (REEL7 = 3,000 units per reel) in a 3-lead SC70 (KS-3) package measuring 2.0 mm × 2.1 mm × 0.9 mm. The SC70 footprint allows high-density placement and is reflow-compatible per JEDEC J-STD-020. The ADM809SAKS-REEL7 meets lead-free soldering requirements and carries full material declarations per Analog Devices' compliance documentation.