Analog Devices Inc./Maxim Integrated MAX9686BCSA

Overview

MAX9686BCSA from Maxim Integrated is a single, very fast TTL-output comparator fabricated in a high-frequency bipolar process (f_T = 6GHz), delivering 6ns propagation delay, ±5V dual-supply operation, and differential inputs with complementary TTL-compatible outputs. It is used in high-speed threshold detection within analog-to-digital converter front-ends and precision timing triggers.

For engineers reviewing the MAX9686BCSA datasheet, MAX9686BCSA pinout, MAX9686BCSA application, or MAX9686BCSA equivalent, key selection factors include latch-enable timing (2ns setup), input offset voltage (±3mV), supply current (16–25mA), and SO-8 package compatibility with legacy high-speed comparator layouts.

Technical Context

The MAX9686BCSA implements a fully differential, latched comparator architecture with independent LE control, enabling precise edge-triggered sampling at >200MHz signal rates. Its bipolar design ensures stable DC matching (CMRR ≥80dB, PSRR ≥70dB) alongside ultrafast transient response.

It operates from ±5V supplies (absolute max ±6V), supports TTL-level outputs (VOH ≥2.4V, VOL ≤0.5V @ 3mA/8mA), and requires grounded LE when latch function is unused. Input common-mode range spans ±3.0V, with differential input voltage limited to 5V.

Key Specifications

Pinout & Package

MAX9686BCSA is housed in an 8-pin SO (Small Outline) package with exposed pad not present; thermal resistance θ_JA = 180°C/W, θ_JC = 115°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed TTL-output comparator applications.

Compared with MAX9686BCSA, LT1016CS8#PBF trades speed for lower cost and broader availability, while ADCMP572BCPZ-R2 delivers superior speed but mandates redesign for ECL interfacing and non-SO packaging - neither is pin-compatible, and both require validation for TTL-level system integration.

Availability

MAX9686BCSA is available at Aetrix Electronics and suitable for high-speed analog-to-digital converters, precision threshold detectors, and high-speed trigger circuits requiring stable component supply during legacy system maintenance and obsolescence mitigation.

Supply support for MAX9686BCSA 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.

The MAX9686 product line was engineered specifically for ultrafast, precision threshold detection in instrumentation and data acquisition systems demanding TTL-compatible outputs and sub-10ns timing fidelity.

FAQ

What is the recommended power supply configuration for MAX9686BCSA?

The MAX9686BCSA requires dual ±5V supplies (V+ = +5V, V− = −5.2V per datasheet). Decoupling capacitors (0.1µF ceramic) must be placed adjacent to pins 5 (V−) and 8 (V+) with short traces to GND (pin 1). Operation outside ±6V absolute maximum ratings risks permanent damage. The MAX9686BCSA draws 16–25mA from V+ and 13–20mA from V− under typical conditions.

Does MAX9686BCSA support latch functionality, and how is it implemented?

Yes, the MAX9686BCSA includes a TTL-compatible latch enable (LE) input on pin 2. When LE transitions high, outputs lock to the input state at that instant and remain latched while LE stays high. If latching is unused, LE must be tied to GND. The MAX9686BCSA guarantees 2ns setup time and supports minimum LE pulse widths defined in its timing diagram. This feature enables synchronous sampling in high-speed data acquisition systems.

What are the input voltage limitations for MAX9686BCSA?

The MAX9686BCSA specifies an input common-mode voltage range of ±3.0V and a maximum differential input voltage of 5V. Input voltages must stay within ±5V absolute limits. Exceeding these ranges may cause phase reversal or damage. The device's bipolar input stage tolerates brief overvoltage transients only if current-limited externally; no internal clamping diodes are provided. Always verify source impedance and slew rate to prevent oscillation in linear region traversal.

Is MAX9686BCSA pin-compatible with other comparators in its family or industry alternatives?

The MAX9686BCSA is explicitly stated as pin-compatible with LT1016 and AM686 in SO-8 packages. It shares identical pinout (GND, LE, +IN, −IN, V−, OUT, OUT, V+) and TTL logic-level compatibility. However, it is not pin-compatible with the dual MAX9698 or with ECL-output comparators like ADCMP572. Layout reuse is feasible only where footprint, supply, and signal integrity requirements align with the MAX9686BCSA's ±5V, high-speed bipolar characteristics.

Why is MAX9686BCSA marked "Not Recommended for New Designs"?

MAX9686BCSA is marked "Not Recommended for New Designs" because its wafer fabrication process has been discontinued by Maxim's external foundry, making long-term supply uncertain. The datasheet remains published for legacy support, and Maxim recommends evaluating replacements or second-source alternatives. Aetrix Electronics maintains verified inventory for ongoing production and repair of existing systems, but new designs should consider modern equivalents with active manufacturing roadmaps.