Analog Devices Inc. ADM809TAKSZ-REEL

Overview

ADM809TAKSZ-REEL from Analog Devices is a microprocessor supervisory circuit in 3-lead SC70 package, providing push-pull active-low RESET output with 3.08 V reset threshold, 140–460 ms power-on reset timeout, and operation down to 1.0 V VCC. It monitors supply voltage in embedded controllers and ensures reliable reset assertion during brownout and power-up for industrial microprocessor systems.

For engineers reviewing the ADM809TAKSZ-REEL datasheet, ADM809TAKSZ-REEL pinout, ADM809TAKSZ-REEL application, or ADM809TAKSZ-REEL equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), low 17 μA quiescent current, push-pull drive capability (3.2 mA sink at VTH min), and SC70 footprint compatibility with space-constrained PCB layouts.

Technical Context

The ADM809TAKSZ-REEL integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms (typical) reset timer. Its reference circuit maintains stable threshold detection across temperature (30 ppm/°C drift), enabling robust brownout response even as VCC drops to 1.0 V.

Unlike open-drain variants (e.g., ADM803), this device uses a push-pull output stage that actively drives both high and low states-eliminating need for external pull-up resistors while delivering 0.3 V low-level output at 1.2 mA sink and 0.8×VCC high-level output at 500 μA source under specified conditions.

Key Specifications

Pinout & Package

ADM809TAKSZ-REEL uses a 3-lead SC70 (KS-3) package with exposed pad not electrically connected. Pin 1 = GND, Pin 2 = RESET (active-low push-pull output), Pin 3 = VCC (monitored supply input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TTRG+T and TPS3808G30DBVR, ADM809TAKSZ-REEL uniquely combines SC70 size, 3.08 V precision threshold, guaranteed 1.0 V operation, and 17 μA consumption-making it optimal for space-limited industrial controllers requiring deterministic brownout response.

Availability

ADM809TAKSZ-REEL 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 ADM809TAKSZ-REEL 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 ADM809TAKSZ-REEL belongs to Analog Devices' microprocessor supervisory IC product line, engineered specifically for deterministic power-on reset, brownout protection, and low-voltage operation in mission-critical embedded systems.

FAQ

What is the exact reset threshold voltage of ADM809TAKSZ-REEL and how does it vary with temperature?

The ADM809TAKSZ-REEL has a nominal reset threshold of 3.08 V at 25°C, with guaranteed range of 3.00 V to 3.15 V over −40°C to +85°C and 2.95 V to 3.21 V over −40°C to +125°C. Its temperature coefficient is 30 ppm/°C, meaning threshold drift is ≤ ±0.3% across the full industrial range-critical for stable 3.3 V rail monitoring in varying thermal environments. This specification is confirmed in Table 1 and Table 3 of the ADM809 datasheet Rev. I.

Does ADM809TAKSZ-REEL require an external pull-up resistor on the RESET pin?

No, ADM809TAKSZ-REEL does not require an external pull-up resistor because it features a push-pull RESET output. Unlike the open-drain ADM803, this variant actively drives both high and low states: RESET sinks up to 3.2 mA when low and sources up to 500 μA when high (at VCC > VTH max). This eliminates BOM components and simplifies interface to standard CMOS reset inputs, as explicitly stated in the General Description and Pin Function Descriptions sections.

What is the minimum VCC voltage at which ADM809TAKSZ-REEL continues to assert RESET?

ADM809TAKSZ-REEL continues to assert RESET (hold low) down to VCC = 1.0 V, as specified in the "VCC OPERATING VOLTAGE RANGE" row of Table 1 (Rev. I, Page 3). This ensures fail-safe behavior during deep brownout events where supply collapses below typical logic thresholds-enabling reliable system recovery without spurious releases. The device remains functional and maintains reset assertion until VCC falls below 1.0 V, per Absolute Maximum Ratings and General Description.

Is ADM809TAKSZ-REEL compatible with both 3.3 V and 5 V microcontroller reset inputs?

Yes, ADM809TAKSZ-REEL is compatible with both 3.3 V and 5 V microcontrollers. Its push-pull RESET output delivers 0.8×VCC when high (e.g., 2.64 V at 3.3 V VCC, 4.0 V at 5 V VCC) and <0.4 V when low-meeting standard CMOS input thresholds across both logic families. The datasheet confirms interoperability with "3 V and 5 V, or any nominal voltage within the minimum and maximum specifications for VCC" in the Interfacing section (Page 8).

What package type and dimensions does ADM809TAKSZ-REEL use, and is it RoHS compliant?

ADM809TAKSZ-REEL uses the 3-lead SC70 package (JEDEC KS-3), measuring 2.0 mm × 2.1 mm × 0.9 mm with 0.65 mm lead pitch. The "Z" suffix in the part number explicitly denotes RoHS compliance per the Ordering Guide footnote (Page 10). Package mechanical data is verified in Figure 15 (Page 9), and RoHS status is confirmed by branding "M4K" on top and "XX" on bottom per manufacturer documentation.