Analog Devices Inc. ADM809ZAKSZ-REEL7

Overview

ADM809ZAKSZ-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 VCC down to 1.0 V and operates in SC70-3 package for embedded power management in low-voltage microcontroller systems.

For engineers reviewing the ADM809ZAKSZ-REEL7 datasheet, ADM809ZAKSZ-REEL7 pinout, ADM809ZAKSZ-REEL7 application, or ADM809ZAKSZ-REEL7 equivalent, key selection criteria include reset threshold accuracy at extended temperature, ultra-low quiescent current, push-pull drive capability without external pull-up, and compatibility with 2.5 V/3.3 V system rails requiring brownout protection.

Technical Context

The ADM809ZAKSZ-REEL7 integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms reset timer. Its reference circuit maintains ±0.07 V threshold tolerance across −40°C to +125°C, enabling reliable reset assertion during slow-ramp or noisy power-up sequences.

It features a push-pull RESET output capable of sinking 1.2 mA at V_TH min while maintaining V_OL ≤ 0.3 V, and sourcing 500 μA at V_CC > V_TH max with V_OH ≥ 0.8 × V_CC, eliminating need for external pull-up resistors in standard CMOS interfacing.

Key Specifications

Pinout & Package

ADM809ZAKSZ-REEL7 is housed in a 3-lead SC70 (KS-3) package per JEDEC standards, with 0.65 mm lead pitch and coplanarity ≤ 0.10 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809ZTR, ADM809ZAKSZ-REEL7 offers lower supply current and longer guaranteed reset hold time; compared with TPS3808G12DBVR, it delivers factory-trimmed 2.32 V accuracy without external components-critical for production consistency in cost-sensitive industrial meters.

Availability

ADM809ZAKSZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical sensor nodes, and automotive body control units requiring stable component supply with full −40°C to +125°C qualification and RoHS compliance.

Supply support for ADM809ZAKSZ-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' precision power monitoring product line, designed specifically for reliable microprocessor reset generation in harsh environments where supply stability cannot be assumed.

FAQ

What is the exact reset threshold voltage of ADM809ZAKSZ-REEL7 and how does it vary with temperature?

The ADM809ZAKSZ-REEL7 has a nominal reset threshold of 2.32 V at 25°C, with guaranteed range of 2.25 V to 2.38 V at −40°C to +85°C and 2.22 V to 2.42 V at −40°C to +125°C. This ±0.07 V tolerance ensures consistent brownout detection across full industrial temperature range without calibration. The device uses a trimmed bandgap reference, not resistor-based division, so threshold drift is minimized and specified in the datasheet's Table 1.

Does ADM809ZAKSZ-REEL7 require an external pull-up resistor on the RESET pin?

No, ADM809ZAKSZ-REEL7 does not require an external pull-up resistor because it features a push-pull RESET output. Unlike open-drain variants (e.g., ADM803), this version actively drives both high and low states: V_OH ≥ 0.8 × V_CC at 500 μA source current and V_OL ≤ 0.3 V at 1.2 mA sink current. This eliminates BOM items and simplifies interface to standard CMOS reset inputs.

What is the minimum VCC voltage at which ADM809ZAKSZ-REEL7 continues to assert RESET?

ADM809ZAKSZ-REEL7 continues to assert RESET (i.e., hold output low) down to V_CC = 1.0 V, as specified in the Absolute Maximum Ratings and General Description sections. Below 1.0 V, functionality is not guaranteed. This 1 V operation enables reliable reset hold during deep brownout events common in battery-backed or unregulated power systems.

How does the 240 ms reset timeout of ADM809ZAKSZ-REEL7 behave across temperature and supply voltage?

The ADM809ZAKSZ-REEL7 reset timeout is 240 ms typical at 25°C, with a guaranteed range of 140–460 ms at −40°C to +85°C and 100–840 ms at 85°C to +125°C. This variation is due to internal RC timing element sensitivity; Figure 8 in the datasheet shows measured values for ADM8xxR grade. Designers should use the 140 ms minimum for timing-critical boot sequences and verify worst-case hold time in thermal validation.

Is ADM809ZAKSZ-REEL7 RoHS compliant and what does the 'Z' suffix indicate?

Yes, ADM809ZAKSZ-REEL7 is RoHS compliant-the 'Z' in the part number explicitly denotes RoHS-compliant packaging per Analog Devices' ordering guide. The device uses lead-free terminations and complies with EU Directive 2011/65/EU. The 'Z' appears in both the model (ADM809Z) and package suffix (AKSZ), confirming full compliance including the SC70-3 KS-3 package.