Analog Devices Inc./Maxim Integrated DS1833Z-5+

Overview

DS1833Z-5+ from Maxim Integrated (now Analog Devices) is a precision 5V microprocessor supervisory circuit with active-high reset, 5% VCC trip point tolerance, 350 ms reset timeout, and internal 5 kΩ pull-up resistor. It monitors power supply integrity in embedded controllers and ensures reliable system boot in industrial control panels.

For engineers reviewing the DS1833Z-5+ datasheet, DS1833Z-5+ pinout, DS1833Z-5+ application, or DS1833Z-5+ equivalent, key selection criteria include VCC trip accuracy (4.5–4.74 V), reset assertion timing (250–450 ms), operating temperature range (–40°C to +85°C), and SOT-223 package compatibility with PCB layout constraints.

Technical Context

The DS1833Z-5+ integrates a temperature-compensated voltage reference and comparator to detect VCC out-of-tolerance conditions. Its reset output remains high for 350 ms after VCC returns within specification, ensuring microprocessor stabilization before release.

It operates across 1.2 V to 5.5 V supply range but is configured for 5 V nominal monitoring with ±5% trip threshold (4.5–4.74 V). The device features internal pull-up on RST and supports both power-up and power-down reset assertion without external components.

Key Specifications

Pinout & Package

SOT-223 package with 4-pin configuration: compact surface-mount footprint, thermal pad for enhanced heat dissipation, and industry-standard land pattern.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–T51D+ and TPS3808G50DBVR, the DS1833Z-5+ delivers tighter trip accuracy (±5%), longer guaranteed reset duration, and built-in pull-up-reducing external component dependency and simplifying validation for 5 V industrial microcontroller platforms.

Availability

DS1833Z-5+ is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, and medical diagnostic interfaces requiring stable component supply and long-term production continuity.

Supply support for DS1833Z-5+ 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

Analog Devices (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and power management ICs for high-reliability industrial, automotive, and communications systems.

The DS1833Z-5+ belongs to Maxim's EconoReset family of supervisory circuits, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications with strict timing and accuracy requirements.

FAQ

What is the exact VCC trip point range for DS1833Z-5+?

The DS1833Z-5+ has a specified VCC trip point range of 4.5 V (minimum) to 4.74 V (maximum), centered at 4.625 V, corresponding to ±5% tolerance around 5 V. This range is validated across –40°C to +85°C and ensures consistent power-fail detection without external calibration. The DS1833Z-5+ uses an internal temperature-compensated reference to maintain this accuracy over its full operating temperature range.

Does DS1833Z-5+ require an external pull-up resistor on the RST pin?

No, the DS1833Z-5+ includes an internal pull-up resistor ranging from 3.75 kΩ to 6.25 kΩ on the RST output pin. This eliminates the need for an external component, simplifying PCB layout and reducing BOM count. The DS1833Z-5+ drives RST actively high during reset and releases it to the internal pull-up state, ensuring predictable logic levels without additional design effort.

What is the guaranteed reset pulse width for DS1833Z-5+ after power recovery?

The DS1833Z-5+ guarantees a reset active time of 250 ms minimum to 450 ms maximum, with a typical value of 350 ms after VCC returns to within tolerance. This timing ensures sufficient stabilization of both the 5 V supply and connected microprocessor before reset release. The DS1833Z-5+ maintains this behavior across its full operating temperature and supply voltage ranges.

Can DS1833Z-5+ operate with supply voltages below 5 V?

Yes, the DS1833Z-5+ supports supply voltages from 1.2 V to 5.5 V per absolute maximum ratings, but its internal trip threshold is fixed at ±5% of 5 V (i.e., 4.5–4.74 V). It will assert reset whenever VCC falls below that window, regardless of actual supply level - meaning it functions only as a 5 V monitor, not a general-purpose low-voltage detector. The DS1833Z-5+ does not adapt its trip point for lower VCC values.

Is DS1833Z-5+ compatible with SOT-223 PCB footprints used for other Maxim supervisory ICs?

Yes, the DS1833Z-5+ uses the standard SOT-223-4 package with identical mechanical dimensions and pin assignment (GND–RST–VCC–GND) as documented in Maxim's mechanical drawings. Its thermal pad (Pin 4) aligns with common SOT-223 land patterns, enabling drop-in compatibility with existing layouts designed for functionally similar parts like MAX6326 or MAX6346 variants - provided trip point and timing requirements match.