Analog Devices Inc./Maxim Integrated MAX8211CSA

Overview

MAX8211CSA from Analog Devices is a CMOS micropower voltage detector IC designed to monitor supply rails and trigger microprocessor power-fail warnings. It features a 1.15V internal bandgap reference, ±40mV threshold accuracy (±3.5%), 5µA quiescent current, 7mA current-limited open-drain output sink, and operates across 2.0V–16.5V supply range. It is used in undervoltage detection circuits for logic-supply monitoring in embedded control systems.

For engineers reviewing the MAX8211CSA datasheet, MAX8211CSA pinout, MAX8211CSA application, or MAX8211CSA equivalent, key selection criteria include programmable trip voltage via external resistor divider, hysteresis-enabled noise immunity, low-leakage THRESH input (<10nA), guaranteed operation over 0°C to +70°C, and SO-8 package compatibility with legacy ICL8211 designs.

Technical Context

The MAX8211CSA implements a precision comparator architecture with an integrated 1.15V bandgap reference and open-drain n-channel output stage that activates when THRESH voltage falls below the reference. Its hysteresis output (HYST) provides positive feedback capability up to 10mA, enabling stable switching in noisy environments.

Unlike the MAX8212 variant, the MAX8211CSA enforces a 7mA typical current limit on its OUT pin-critical for direct LED drive without series resistors-and exhibits <0.1mV disparity between THRESH trip point and HYST activation threshold, minimizing output chatter during marginal voltage transitions.

Key Specifications

Pinout & Package

MAX8211CSA is housed in an 8-pin SO (Small Outline) package per package code S8-2, with 1.27mm pitch, gull-wing leads, and JEDEC MS-012AC compliance. Pin 1 is THRESH; Pin 2 is HYST; Pin 3 and Pin 4 are no-connect; Pin 5 is V+; Pin 6 is GND; Pin 7 and Pin 8 are no-connect; Pin 8 is OUT.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detection applications.

Compared with MAX8211ESA and TLV809E33DBZR, the MAX8211CSA uniquely balances programmable trip voltage, integrated hysteresis feedback, and commercial-grade SO-8 packaging-making it optimal for cost-sensitive, space-constrained designs requiring adaptability across multiple supply rails.

Availability

MAX8211CSA is available at Aetrix Electronics and suitable for microprocessor voltage monitoring, battery-backup switchover, and industrial power-supply fault monitoring requiring stable component supply and long-term production continuity.

Supply support for MAX8211CSA 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.

The MAX8211CSA belongs to Analog Devices' precision voltage supervisor product line, engineered specifically for reliable, low-power, programmable supply monitoring in embedded control and power management systems.

FAQ

What is the maximum supply voltage rating for the MAX8211CSA?

The MAX8211CSA has an absolute maximum supply voltage rating of +18V, but its guaranteed operating range is 2.0V to 16.5V. Exceeding 18V may cause permanent damage. The device is not rated for use in applications where transient spikes or sustained voltages approach this limit-designers should implement clamping or regulation upstream if system rails exceed 16.5V. This specification applies strictly to the MAX8211CSA and is verified per Analog Devices' Absolute Maximum Ratings table.

Does the MAX8211CSA require external components to set the trip voltage?

Yes, the MAX8211CSA requires two external resistors (R1 and R2) to form a voltage divider from the monitored rail to the THRESH pin, enabling precise trip-point programming. A third resistor (R3) is optional and used only when hysteresis is needed. The internal 1.15V reference remains fixed; all trip voltage adjustment is achieved through resistor ratios-not internal trimming. This configuration is confirmed in the Typical Operating Circuit and Applications Information sections of the official MAX8211/MAX8212 datasheet.

Can the MAX8211CSA drive an LED directly without a current-limiting resistor?

Yes, the MAX8211CSA can drive an LED directly because its OUT pin is current-limited to 7mA typical-sufficient for indicator LEDs with forward voltage ≤2.2V and luminous intensity requirements under 5mcd. This capability is explicitly stated in the Detailed Description section and validated by the "Define Output Current Limit (MAX8211)" feature. However, for higher-brightness LEDs or extended duty cycles, thermal derating and voltage headroom must be verified per the SO-8 package's 471mW power dissipation limit.

Is the MAX8211CSA pin-compatible with the ICL8211?

Yes, the MAX8211CSA is a plug-in replacement for the ICL8211 in applications where the supply voltage remains below 16.5V. Both share identical 8-pin SO pinout, terminal functions, and basic detection behavior. However, the MAX8211CSA uses CMOS technology-delivering lower quiescent current (5µA vs. ~100µA), tighter reference tolerance, and higher hysteresis output drive-making it a functional and mechanical upgrade, not just a drop-in substitute.

What is the purpose of the HYST pin on the MAX8211CSA?

The HYST pin on the MAX8211CSA is an open-drain p-channel output that supplies up to 10mA of current for implementing user-defined hysteresis. When connected via resistor R3 to the THRESH node, it introduces positive feedback-raising the effective trip threshold on rising voltage and lowering it on falling voltage-to prevent output oscillation near the trip point. This design feature is documented in Figures 3 and 5 and Electrical Characteristics tables, confirming its role in noise-immune switching for real-world power rails.