Analog Devices Inc./Maxim Integrated MAX975ESA-T

Overview

The MAX975ESA-T from Maxim Integrated is a single high-speed comparator with auto-standby and low-power operating modes, optimized for +3V/+5V single-supply battery-powered systems. It delivers 28ns propagation delay in high-speed mode, 3µA supply current in low-power mode, and rail-to-rail output swing without external pull-ups-enabling direct CMOS/TTL interfacing in IR receivers and threshold detection circuits.

For engineers reviewing the MAX975ESA-T datasheet, MAX975ESA-T pinout, MAX975ESA-T application, or MAX975ESA-T equivalent, key selection criteria include auto-standby timeout adjustability via STO capacitor, ground-sensing input capability (–0.2V to V_CC–1.2V), internal hysteresis in high-speed mode, and dual-mode power management for ultra-low-quiescent systems.

Technical Context

The MAX975ESA-T implements a dual-path comparator architecture: a fast high-speed comparator (28ns t_PD) and a slower low-power comparator (480ns t_PD), with automatic mode switching controlled by output stability monitoring. Its auto-standby logic triggers transition to low-power mode after an adjustable timeout (t_ASB = 10 × C_STO µs) when OUT remains static.

Input stage supports rail-to-rail differential voltage and –0.2V to (V_CC–1.2V) common-mode range, enabling ground-referenced sensing. Internal hysteresis (0.3–4mV) prevents oscillation on slow inputs, while STAT pin provides real-time mode status and 3mA sourcing capability for auxiliary circuit power control.

Key Specifications

Pinout & Package

The MAX975ESA-T is housed in an 8-pin SO (Small Outline) package with 1.27mm pitch, JEDEC MS-012AC compliant, body size 4.9mm × 3.9mm × 1.75mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMV7215M5X and TLV3604DBVR, the MAX975ESA-T uniquely combines sub-30ns speed with microamp-level standby current and programmable auto-standby-making it the only option among the three suitable for long-life, event-driven battery operation.

Availability

The MAX975ESA-T is available at Aetrix Electronics and suitable for battery-powered systems, IR receivers, and threshold detectors requiring stable component supply and guaranteed long-term availability.

Supply support for MAX975ESA-T 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

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and consumer markets.

The MAX975ESA-T belongs to Maxim's high-performance comparator product line, engineered specifically for energy-constrained systems needing intelligent power-state transitions without sacrificing speed or accuracy.

FAQ

What is the maximum supply voltage rating for the MAX975ESA-T?

The MAX975ESA-T has an absolute maximum supply voltage (V_CC) of +6V. Operation is specified over +2.7V to +5.25V; exceeding +6V may cause permanent damage. The device is optimized for +3V and +5V single-supply systems, and its electrical characteristics-including propagation delay, supply current, and input common-mode range-are guaranteed within the +2.7V to +5.25V operating range. Always observe derating guidelines for continuous power dissipation at elevated ambient temperatures.

How does the auto-standby timeout period work on the MAX975ESA-T?

The MAX975ESA-T enters auto-standby mode when its output remains static for a user-defined timeout period, set by an external capacitor connected between STO (Pin 5) and GND. The relationship is t_ASB = 10 × C_STO µs, where C_STO is in pF-for example, a 100pF capacitor yields a 1µs timeout. During auto-standby, supply current drops to ~3µA and propagation delay increases to ~480ns. STAT (Pin 4) goes high to indicate this state. The MAX975ESA-T exits auto-standby automatically upon output transition or via LP pin control.

Can the MAX975ESA-T interface directly with CMOS and TTL logic families?

Yes, the MAX975ESA-T features rail-to-rail CMOS-compatible outputs: VOH ≥ 0.7×V_CC and VOL ≤ 0.4V across its full operating range (+2.7V to +5.25V). This eliminates the need for external pull-up resistors when driving standard 3.3V or 5V CMOS and TTL inputs. Output sink/source capability (2mA min) ensures robust logic-level translation without signal degradation, making the MAX975ESA-T ideal for direct interfacing in mixed-voltage systems such as battery-powered microcontroller peripherals.

What is the purpose of the STAT pin on the MAX975ESA-T?

The STAT pin on the MAX975ESA-T serves two critical functions: first, it indicates real-time operating mode-high during auto-standby or low-power mode, low during high-speed mode; second, it acts as a 3mA current source to power auxiliary circuitry (e.g., LED indicators or wake-up logic). This dual role enables autonomous power-gating: external circuitry can be powered only when the comparator is in low-power or standby states, reducing overall system quiescent current. STAT's open-drain compatibility also allows wired-OR configuration in multi-comparator systems.

Does the MAX975ESA-T require external hysteresis for noise immunity?

No, the MAX975ESA-T includes internal hysteresis (0.3–4mV input-referred) specifically in high-speed mode, which prevents output oscillation on slow-moving or noisy inputs without external components. This built-in hysteresis ensures clean switching even when input signals cross the threshold gradually-common in IR receivers or analog sensor interfaces. External hysteresis resistors are unnecessary unless a larger, user-defined hysteresis band is required for specialized noise environments; in such cases, positive feedback can be added to the IN+ or IN– node per standard comparator design practice.