Analog Devices Inc./Maxim Integrated MAX902CSD+

Overview

MAX902CSD+ from Maxim Integrated is a high-speed, low-power quad voltage comparator with differential analog inputs and TTL-compatible outputs featuring independent latch inputs per channel. It delivers 8ns typical propagation delay at 5mV overdrive, consumes 18mW per comparator at +5V, supports ±5V or single +5V analog supplies, and operates across 0°C to +70°C - ideal for high-speed A/D converter front-ends and line receivers.

For engineers reviewing the MAX902CSD+ datasheet, MAX902CSD+ pinout, MAX902CSD+ application, or MAX902CSD+ equivalent, key selection considerations include latch-enabled output hold timing (tpd+(D) = 10ns), input common-mode range extending to VEE, TTL-level output drive capability (VOH = 2.4V min, VOL = 0.4V max), and dual-supply isolation between analog (VCC/VEE) and digital (VDD) domains.

Technical Context

The MAX902CSD+ implements four independent high-gain comparators with internal active pull-ups on TTL outputs and dedicated latch inputs (LE1–LE4) that freeze output states on logic-low assertion. Its analog input stage accepts common-mode voltages from VEE − 0.1V to VCC − 2.25V and tolerates differential inputs up to VCC + 0.2V, enabling ground-sensing operation with single-supply configurations.

Timing behavior is characterized by matched 8ns (typ) tpd+ and tpd− response under 5mV overdrive into 15pF load, with ∆tpd ≤ 2ns between channels. Latch control follows strict setup (ts = 2ns) and hold (th = 1ns) requirements, and disable-to-output delays (tpd+(D)/tpd−(D)) are specified at 10ns/12ns - critical for synchronized sampling in multi-channel data acquisition systems.

Key Specifications

Pinout & Package

Narrow SO-14 package (14-pin small-outline IC) with exposed pad not electrically connected; JEDEC MS-012AC compliant; body size 8.65mm × 3.90mm × 1.75mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX902CSD+, MAX9202CSD+ offers identical speed and pinout with half the power consumption, making it the preferred upgrade path; LM339DR provides basic quad comparison at vastly lower speed and zero latch capability - suitable only for static monitoring tasks where timing is irrelevant.

Availability

MAX902CSD+ is available at Aetrix Electronics and suitable for high-speed data acquisition, industrial line receiver systems, and programmable threshold monitoring requiring stable component supply and long-term design continuity.

Supply support for MAX902CSD+ 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 semiconductor company specializing in high-performance analog and mixed-signal ICs for industrial, communications, and computing applications.

The MAX900–MAX903 family was designed specifically for high-speed, low-power voltage comparison in data conversion and real-time signal conditioning systems - emphasizing propagation delay consistency, supply flexibility, and latch-controlled output retention.

FAQ

What is the operating temperature range for MAX902CSD+?

The MAX902CSD+ is rated for 0°C to +70°C ambient operation, as confirmed in the Ordering Information table. This commercial-grade temperature range aligns with its "C" suffix designation and supports use in office, lab, and non-extreme industrial environments. The device's electrical characteristics - including propagation delay, input offset voltage, and supply current - are guaranteed across this full range per the datasheet's "full operating temperature" test conditions.

Does MAX902CSD+ support single-supply operation?

Yes, MAX902CSD+ supports true single-supply operation with VEE tied to ground and VCC supplied from +5V to +10V. Its input common-mode range extends to VEE − 0.1V, enabling ground-referenced signal detection. The datasheet explicitly confirms this in Figure 1A and the Applications Information section, noting that the analog supply can operate from +5V to +10V with VEE grounded - a key feature distinguishing it from comparators requiring split supplies.

What is the function of the LATCH pins on MAX902CSD+?

The four LATCH pins (pins 4, 5, 12, 13) on MAX902CSD+ provide independent control over each comparator's output state: driving a latch pin low freezes the corresponding output at its current logic level, while driving it high restores transparency. This is confirmed in the Pin Descriptions table and Timing Diagram (Figure 2), where latch disable-to-output delays (tpd+(D)/tpd−(D)) are specified. Unlike the MAX901, the MAX902CSD+ includes these latches as a core functional feature.

Can MAX902CSD+ be powered from separate analog and digital supplies?

Yes, MAX902CSD+ is explicitly designed for separate analog and digital supplies: VCC/VEE power the comparator core (±5V or +5V/+10V with VEE = 0V), while VDD = +5V powers the latch logic and output stages. The datasheet states this in the General Description and Power Supplies section, and Figure 1C illustrates the split ±5V analog supply with isolated digital ground - a configuration that minimizes noise coupling between analog sensing and digital control domains.

Is MAX902CSD+ recommended for new designs?

No - the MAX902CSD+ is marked "Not Recommended for New Designs" due to discontinuation of its underlying wafer process. While fully functional and supported for existing users, Maxim recommends migration to the pin-compatible MAX9202CSD+, which delivers identical speed (8ns propagation delay) at half the power (9mW/comparator). The MAX902CSD+ datasheet remains available for legacy design maintenance, but no new product introductions should specify it.