Analog Devices Inc./Maxim Integrated MAX997ESA

Overview

MAX997ESA from Maxim Integrated is a single ultra-high-speed comparator with internal hysteresis, optimized for +3V/+5V single-supply operation. It features 4.5ns propagation delay (5mV overdrive), ±3.5mV input-referred hysteresis, and Beyond-the-Rails™ input range extending 100mV beyond both rails. Its TTL/CMOS-compatible output sinks or sources 4mA to within 0.52V of GND or VCC, making it suitable for GPS receiver threshold detection and high-speed sampling circuits.

For engineers reviewing the MAX997ESA datasheet, MAX997ESA pinout, MAX997ESA application, or MAX997ESA equivalent, key selection considerations include its shutdown mode (270μA per comparator), SO-8 package compatibility, -40°C to +85°C operating range, and absence of latch-enable functionality-distinguishing it from MAX961/MAX963 variants.

Technical Context

The MAX997ESA implements a current-driven output stage enabling fast slew rates while maintaining low static power; output transitions are linearly dependent on load capacitance. Its input stage integrates front-to-back diode clamps and 200Ω series resistors to protect against differential overvoltage up to 3×VF (~2.1V), limiting input bias current drift under stress.

Internal hysteresis (3.5mV) establishes distinct rising/falling trip points to suppress noise-induced oscillation near decision thresholds. Unlike latch-equipped variants, MAX997ESA lacks LE input and complementary outputs-its architecture prioritizes minimal latency and deterministic timing over data retention.

Key Specifications

Pinout & Package

MAX997ESA is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (package code S8-2). Pin 1 is located at the top-left corner adjacent to the index mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX961ESA, MAX997ESA removes latch logic to reduce propagation uncertainty and die area; versus TLV3501CD, it delivers guaranteed noise immunity and wider input voltage tolerance at the expense of slightly higher quiescent current (5mA vs. 4.5mA).

Availability

MAX997ESA is available at Aetrix Electronics and suitable for GPS receivers, portable medical instrumentation, high-speed data sampling systems, and industrial line receiver interfaces requiring stable component supply across extended temperature ranges.

Supply support for MAX997ESA 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 demanding industrial, communications, and computing applications.

The MAX961–MAX964/MAX997/MAX999 family targets ultra-high-speed comparator needs in portable, low-voltage, and noise-sensitive systems-emphasizing speed, rail-to-rail input flexibility, and integrated hysteresis to simplify high-fidelity signal conditioning.

FAQ

What is the maximum capacitive load the MAX997ESA output can drive while maintaining 4.5ns propagation delay?

The MAX997ESA maintains its specified 4.5ns propagation delay (5mV overdrive) with a 5pF load, as characterized in the datasheet. Load capacitance increases delay linearly: at 10pF, typical tPD rises to ~5.2ns; at 20pF, it reaches ~6.0ns. For critical timing applications, keep total node capacitance ≤5pF using short traces and minimal downstream fanout to preserve sub-5ns performance.

Does the MAX997ESA support operation at 2.7V supply, and how does performance change versus 5V?

Yes, the MAX997ESA operates from 2.7V to 5.5V. At 2.7V, propagation delay increases to 5.0ns (typical), output swing reduces to VCC–0.52V/0.52V, and supply current drops to 4.5mA. Input common-mode range remains -0.1V to VCC+0.1V, preserving Beyond-the-Rails functionality. These trade-offs make it viable for ultra-low-power 3V systems where 0.5ns timing margin is acceptable.

Can the MAX997ESA be used in place of the MAX961ESA without PCB modifications?

No-while both use the same 8-pin SO package, MAX997ESA has N.C. on pins 1 and 5, whereas MAX961ESA uses pin 1 for LE and pin 5 for QB. Direct substitution would leave LE unconnected (causing undefined latch behavior) and short QB to N.C., risking malfunction. Board-level redesign is required to replace MAX961ESA with MAX997ESA.

What is the input bias current specification for MAX997ESA, and how does it vary with common-mode voltage?

The MAX997ESA exhibits ±15µA (max) input bias current across the full -40°C to +85°C range, measured at VIN+ = VIN− = 0V or VCC with VCC = 5V. Bias current remains stable within ±2µA from -0.1V to VCC+0.1V common-mode range but increases sharply beyond this zone due to internal clamp diode conduction-confirming the necessity of staying within the specified input voltage window.

How does the shutdown mode affect output state and recovery timing in MAX997ESA?

When SHDN is driven high, MAX997ESA outputs enter high-impedance state within 150ns (tOFF), and supply current drops to 270μA. To restore operation, SHDN must be pulled low; outputs become valid 250ns (tON) after SHDN falls. During shutdown, the output is not actively driven-external pull-up/down resistors may be needed if bus contention must be avoided.