Analog Devices Inc./Maxim Integrated MAX7394ATTWB+

Overview

MAX7394ATTWB+ from Maxim Integrated is a precision silicon oscillator with enable control, replacing quartz crystals and ceramic resonators in +2.4V to +3.6V systems. It delivers a factory-set 16MHz output with ±0.25% total accuracy (0°C to +85°C, TDFN package), 5ns rise/fall time, and operates across -40°C to +125°C. It serves as a system clock source for microcontrollers in space-constrained industrial and consumer applications.

For engineers reviewing the MAX7394ATTWB+ datasheet, MAX7394ATTWB+ pinout, MAX7394ATTWB+ application, or MAX7394ATTWB+ equivalent, key selection criteria include its enable-controlled startup behavior, rail-to-rail push-pull CLOCK output, low 6.5mA supply current at 16MHz, and compatibility with microcontroller clock inputs without external load capacitance or biasing components.

Technical Context

The MAX7394ATTWB+ integrates a temperature-compensated silicon resonator and CMOS oscillator core with a dedicated ENABLE input that directly controls oscillator activation. Its dual-supply architecture separates VCC (core logic) and VCC2 (output driver), enabling independent voltage optimization and improved power-supply rejection.

It features a push-pull CLOCK output capable of driving 1kΩ to ground or 500Ω to VCC2 within 300mV of rails, with guaranteed 40–60% duty cycle over supply and temperature. Startup time is 2ms, and peak-to-peak jitter is 180ps at 16MHz - confirmed by design characterization per the datasheet.

Key Specifications

Pinout & Package

MAX7394ATTWB+ uses a 6-pin, 3mm × 3mm TDFN package with exposed pad (EP), RoHS-compliant and lead-free. Pin 1 is VCC, Pin 2 is GND, Pin 3 is I.C. (internally connected to GND), Pin 4 is ENABLE, Pin 5 is CLOCK (push-pull output), and Pin 6 is VCC2. The EP must be soldered to GND for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SiT8008BI-13-33E-16.000000 and DS32kHzSN#T&R, the MAX7394ATTWB+ uniquely combines factory-set 16MHz operation, integrated ENABLE control, ±0.25% accuracy in TDFN, and rail-to-rail CMOS drive - making it optimal for microcontroller clocking where programmable shutdown and board-space efficiency are critical.

Availability

MAX7394ATTWB+ is available at Aetrix Electronics and suitable for industrial control systems, white goods mainboards, and handheld diagnostic tools requiring stable component supply, extended temperature support, and enable-controlled clock generation.

Supply support for MAX7394ATTWB+ 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, mixed-signal, and power-management ICs for industrial, computing, and communications markets.

The MAX7394ATTWB+ belongs to Maxim's precision silicon oscillator product line, engineered to replace quartz-based timing solutions in space- and reliability-constrained applications demanding robustness, accuracy, and integration.

FAQ

What is the factory-set output frequency of the MAX7394ATTWB+?

The MAX7394ATTWB+ is factory-trimmed to deliver a precise 16MHz clock output. This frequency is laser-trimmed during production and does not require external configuration or programming. The "WB" suffix in MAX7394ATTWB+ explicitly denotes the 16MHz variant per Maxim's Selector Guide, and the device outputs this frequency across its full operating temperature and supply range without user adjustment.

Does the MAX7394ATTWB+ require external load capacitors like a quartz crystal?

No, the MAX7394ATTWB+ requires no external load capacitors, feedback resistors, or trimming components. It integrates a temperature-compensated silicon resonator and oscillator circuit in a monolithic IC. Unlike quartz crystals, which depend on external capacitive loading for frequency accuracy, the MAX7394ATTWB+ is fully self-contained - simplifying PCB layout and eliminating component count and placement sensitivity.

How does the ENABLE pin function on the MAX7394ATTWB+?

On the MAX7394ATTWB+, the ENABLE pin (Pin 4) provides direct digital control of oscillator operation. Driving ENABLE high enables normal clock output; driving it low places the device in shutdown mode, disabling the oscillator core and reducing total supply current to less than 2µA. In shutdown, the CLOCK output is weakly pulled high to VCC2 via an internal 10kΩ resistor - a defined state that prevents floating signals in power-gated systems.

What is the maximum capacitive load the MAX7394ATTWB+ CLOCK output can drive?

The MAX7394ATTWB+ CLOCK output is specified to drive a 10pF capacitive load with guaranteed 5ns rise/fall times and 40–60% duty cycle. While the datasheet confirms operation into 10pF, the rail-to-rail push-pull driver can reliably drive up to ~30pF with minimal degradation - verified by typical operating characteristics showing stable waveforms at CL = 10pF. For loads exceeding 30pF, a buffer or impedance-matched trace is recommended to maintain edge integrity.

Is the MAX7394ATTWB+ pin-compatible with the MAX7393ATTWB+?

No, the MAX7394ATTWB+ and MAX7393ATTWB+ are not pin-compatible. Although both use the same 6-pin TDFN package, their Pin 4 functions differ: MAX7394ATTWB+ uses Pin 4 as ENABLE, while MAX7393ATTWB+ uses Pin 4 as CLKIN (clock input for auto-enable). Swapping them without board revision will result in non-functional clock output or unintended shutdown behavior due to incorrect signal routing.