Analog Devices Inc./Maxim Integrated MAX9686BCPA

Overview

MAX9686BCPA 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 serves as a high-speed decision element in analog front-ends requiring sub-10ns timing resolution, such as flash ADC sampling clocks and RF envelope detection triggers.

For engineers reviewing the MAX9686BCPA datasheet, MAX9686BCPA pinout, MAX9686BCPA application, or MAX9686BCPA equivalent, key selection considerations include latch-enable timing (2ns setup), input offset voltage (±3mV), DC matching performance at high speed, and compatibility with legacy ±5.2V supply systems used in military-grade test equipment and radar signal conditioning.

Technical Context

The MAX9686BCPA implements a fully differential, high-gain bipolar comparator core with internal latch control logic. Its propagation delay (6ns typ.) and latch setup time (2ns) are guaranteed over full commercial temperature range (0°C to +70°C), and it operates from ±5V supplies with TTL-level output swing (VOH ≥ 2.4V, VOL ≤ 0.5V at specified loads).

It features complementary TTL outputs, differential input voltage range of ±5V, and supports latched operation via dedicated LE pin - when asserted high, outputs freeze the state determined at the LE transition edge; unused LE must be grounded. Input common-mode range extends to ±3V with 80dB CMRR.

Key Specifications

Pinout & Package

MAX9686BCPA is supplied in an 8-pin plastic DIP package (0.300" wide). Pin assignments are validated per Maxim's official QuickView datasheet Rev 2 (19-2399) and match industry-standard pinout for single comparators with latch enable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1016CN8#PBF and AM686JN, the MAX9686BCPA uniquely combines 6ns delay, integrated latch, ±3mV offset, and commercial 8-pin DIP packaging - making it the only viable option for new designs needing all three attributes simultaneously.

Availability

MAX9686BCPA is available at Aetrix Electronics and suitable for high-speed analog-to-digital conversion, RF pulse detection, precision threshold triggering, and legacy military test equipment requiring stable component supply and long-term BOM continuity.

Supply support for MAX9686BCPA 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 applications.

The MAX9686BCPA belongs to Maxim's high-speed comparator product line, designed specifically for applications demanding nanosecond-scale timing resolution, latch synchronization, and TTL interoperability in demanding analog front-end signal chains.

FAQ

What is the operating temperature range for MAX9686BCPA?

The MAX9686BCPA is rated for the commercial temperature range of 0°C to +70°C. This specification is defined in the Ordering Information table of the official datasheet (Rev 2, 19-2399), and all electrical characteristics - including propagation delay, input offset voltage, and latch timing - are guaranteed across this range. The 'C' suffix in MAX9686BCPA explicitly denotes the commercial grade.

Does MAX9686BCPA require external pull-up resistors on its outputs?

No, MAX9686BCPA does not require external pull-up resistors. Its outputs are fully buffered TTL-compatible drivers capable of sourcing 3mA and sinking 8mA, meeting standard TTL logic level specifications (VOH ≥ 2.4V, VOL ≤ 0.5V) under load. This eliminates external components in most interfacing scenarios, including direct connection to 74LS or FPGA I/O banks.

Is MAX9686BCPA pin-compatible with other comparators in the same family?

Yes, MAX9686BCPA shares identical pinout with the MAX9686CPA, MAX9686CSA, and MAX9686CTV variants - all are single-comparator versions differing only in package (DIP, SO, TO-99). This allows direct substitution across packages without PCB redesign, provided mechanical and thermal constraints are satisfied for the target assembly.

Can MAX9686BCPA operate from a single +5V supply?

No, MAX9686BCPA requires dual ±5V supplies (V+ = +5V, V– = –5V) as specified in Absolute Maximum Ratings and Electrical Characteristics tables. Its internal bipolar architecture and TTL output stage depend on symmetric rails; operation from single +5V will result in undefined behavior, output failure, or device damage.

Why is MAX9686BCPA marked "Not Recommended for New Designs"?

MAX9686BCPA is marked "Not Recommended for New Designs" because it was manufactured using an outside wafer foundry process that is no longer available. While functional units remain available for legacy support and repair, Maxim advises new designs to consider modern alternatives with improved availability, extended temperature options, or enhanced features - though no direct drop-in replacement has been designated in public documentation.