Analog Devices Inc./Maxim Integrated DS1833-10/T&R

Overview

DS1833-10/T&R from Maxim Integrated (now Analog Devices) is a precision 5V microprocessor supervisory circuit with 10% V_CC trip point, active-high reset output, and guaranteed 350 ms reset pulse width after power recovery. It features internal 5 kΩ pull-up resistor, temperature-compensated voltage reference, and operates from -40°C to +85°C in SOT-223 package. Used for reliable power-on reset in embedded controllers and industrial microcontroller systems.

For engineers reviewing the DS1833-10/T&R datasheet, DS1833-10/T&R pinout, DS1833-10/T&R application, or DS1833-10/T&R equivalent, key selection criteria include V_CC trip accuracy (4.25–4.49 V), reset assertion timing (250–450 ms), operating current (1.5–2 mA), and SOT-223 thermal performance in space-constrained designs.

Technical Context

The DS1833-10/T&R implements a comparator-based power monitoring architecture using a precision temperature-compensated bandgap reference to detect V_CC deviations beyond ±10% of nominal 5 V. Its internal logic ensures reset remains asserted during brownout and for ≥250 ms after V_CC returns to tolerance.

It integrates an open-drain active-high RST output with internal 5 kΩ pull-up, eliminating external components for standard 5 V logic interfaces. The device requires no external capacitors or resistors to meet JEDEC JESD78 Class II latch-up immunity and supports fast V_CC slew rate detection (t_F = 300 µs for 4.75 V → 4.00 V).

Key Specifications

Pinout & Package

SOT-223 package: 4-pin surface-mount, thermally enhanced plastic case with exposed thermal pad (pin 4 = GND). Pin 1 = GND, Pin 2 = RST (open-drain output), Pin 3 = V_CC, Pin 4 = GND (thermal and electrical ground).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326-L31T and TPS3808G33DBVR, the DS1833-10/T&R uniquely combines 5 V-specific ±10% trip accuracy, integrated pull-up, and guaranteed 250–450 ms reset hold in a thermally optimized SOT-223 package-making it optimal for cost-sensitive, high-reliability 5 V industrial control applications where external component count and thermal margin are critical.

Availability

DS1833-10/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, medical handheld diagnostics, and point-of-sale terminals requiring stable component supply across multi-year production cycles.

Supply support for DS1833-10/T&R 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) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The DS1833-10/T&R belongs to Maxim's EconoReset™ family of supervisory ICs, engineered specifically for cost-effective, single-supply power monitoring and reset generation in 5 V microcontroller-based systems with minimal external components.

FAQ

What is the exact V_CC trip voltage range for DS1833-10/T&R?

The DS1833-10/T&R has a guaranteed V_CC trip point range of 4.25 V (minimum) to 4.49 V (maximum) at 25°C, corresponding to a nominal 10% under-voltage threshold for a 5 V supply. This specification is maintained across the full -40°C to +85°C operating temperature range due to on-chip temperature compensation. The DS1833-10/T&R does not require external calibration or trimming to meet this tolerance.

Does DS1833-10/T&R require an external pull-up resistor on the RST pin?

No, the DS1833-10/T&R includes an internal 5 kΩ pull-up resistor connected to V_CC, enabling direct interface with standard 5 V CMOS and TTL inputs without external components. This feature reduces BOM count and PCB area. The DS1833-10/T&R RST pin is open-drain and actively pulls low during reset assertion; the internal resistor ensures proper high-level logic when released.

What is the reset pulse width behavior of DS1833-10/T&R during power-up and power-down?

During power-up, the DS1833-10/T&R asserts active-high reset for 250–450 ms after V_CC reaches the trip threshold, allowing system stabilization. During power-down, reset is asserted within 100 ns of V_CC falling below the trip point. The DS1833-10/T&R guarantees minimum hold time regardless of V_CC slew rate, supporting reliable operation even with fast transients.

Can DS1833-10/T&R be used with 3.3 V microcontrollers?

The DS1833-10/T&R is designed exclusively for 5 V supply monitoring and generates an active-high reset referenced to V_CC; its RST output swings between 0 V and V_CC (5 V). While the reset signal can interface with 3.3 V logic via level-shifting or series resistor, the DS1833-10/T&R itself does not monitor or regulate 3.3 V rails. For 3.3 V systems, consider dedicated 3.3 V supervisors such as the MAX6326 series instead of DS1833-10/T&R.

What package type and thermal characteristics does DS1833-10/T&R use?

The DS1833-10/T&R is supplied in SOT-223 package (tape-and-reel, T&R), featuring four pins including a dedicated thermal ground (Pin 4) that connects to the exposed copper pad for enhanced heat dissipation. Its θ_JA is rated at 120°C/W on standard 2-layer PCBs, supporting continuous operation at full spec in ambient temperatures up to +85°C. The DS1833-10/T&R SOT-223 footprint is not interchangeable with TO-92 or SOT-23 variants of the same family.