Analog Devices Inc./Maxim Integrated DS1233AZ-15+

Overview

DS1233AZ-15+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit that monitors V_CC for out-of-tolerance conditions and provides pushbutton reset control. It asserts RESET for 350ms after power recovery or button release, features ±15% V_CC trip point (2.64–2.80V), internal 5kΩ pull-up, and operates from –40°C to +85°C in TO-92 package.

For engineers reviewing the DS1233AZ-15+ datasheet, DS1233AZ-15+ pinout, DS1233AZ-15+ application, or DS1233AZ-15+ equivalent, key selection factors include guaranteed 350ms reset timeout, precision voltage threshold accuracy, pushbutton debouncing capability, and compatibility with 3.3V microcontroller power rails requiring reliable power-on and manual reset sequencing.

Technical Context

The DS1233AZ-15+ integrates a temperature-compensated voltage reference and comparator to detect V_CC drop below 2.64V (min) or rise above 2.80V (max), triggering active-low RESET. Its internal timer ensures 250–450ms reset pulse width after power stabilization or pushbutton release.

It supports dual-mode operation: automatic power-fail detection and external pushbutton interface via the RESET pin, with built-in debounce logic and defined detect/release voltage thresholds (0.8–2.0V detect, 0.3–0.8V release) requiring 100pF–0.01μF capacitor to ground.

Key Specifications

Pinout & Package

DS1233AZ-15+ is supplied in TO-92 package (package code Q3+1), with 3 leads and through-hole mounting. Pin 1 = GROUND, Pin 2 = RESET (active-low open-drain output), Pin 3 = V_CC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1233AZ-15+, MAX6326–33D3+T offers tighter threshold accuracy but removes pushbutton functionality, while TPS3808G33DBVR extends timing flexibility at the cost of added external components and no integrated debounce-making DS1233AZ-15+ optimal for cost-sensitive, dual-mode (power + button) 3.3V reset applications.

Availability

DS1233AZ-15+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor nodes, POS terminals, and smart energy meters requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for DS1233AZ-15+ 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, automotive, and computing applications.

The DS1233A family was developed specifically for cost-effective, single-chip microprocessor reset supervision in 3.3V and 5V embedded systems where reliability, simplicity, and minimal external components are critical.

FAQ

What is the exact V_CC trip point range for DS1233AZ-15+?

The DS1233AZ-15+ has a guaranteed V_CC trip point range of 2.64V (minimum) to 2.80V (maximum) at +25°C, corresponding to ±15% tolerance around 3.3V. This range is specified across the full operating temperature range (–40°C to +85°C) and includes temperature compensation to maintain accuracy without external calibration. DS1233AZ-15+ uses an internal precision reference to ensure consistent detection regardless of supply slew rate or noise.

Does DS1233AZ-15+ require an external capacitor for pushbutton operation?

Yes, DS1233AZ-15+ requires a capacitor between 100pF and 0.01μF connected from the RESET pin to ground for proper pushbutton debounce operation. This capacitor filters mechanical switch bounce and enables the internal timer to detect valid release events. DS1233AZ-15+ specifies this requirement explicitly in its datasheet; omitting it may cause erratic reset pulses or failure to assert reset on button release.

Can DS1233AZ-15+ be used with a 5V microcontroller system?

No, DS1233AZ-15+ is designed exclusively for 3.3V systems and has a V_CC trip point centered at 2.72V (±15%). Using it with a 5V supply would result in immediate and continuous reset assertion, as the device interprets 5V as far exceeding its trip threshold. For 5V systems, DS1233-15 or DS1233D-15 variants-specified for 4.0–4.24V trip-are appropriate alternatives. DS1233AZ-15+ must be powered from and monitor a 3.3V rail.

What is the maximum sink current capability of the DS1233AZ-15+ RESET pin?

The DS1233AZ-15+ RESET pin can sink up to +8mA while maintaining VOL ≤ 0.4V at V_CC = 3.3V. This allows direct interfacing with most 3.3V microcontrollers' reset inputs without level-shifting or buffering. The open-drain architecture requires an external or internal pull-up; DS1233AZ-15+ includes a 3.75–6.25kΩ internal pull-up, enabling operation with no external resistor in basic configurations.

Is DS1233AZ-15+ RoHS compliant and lead-free?

Yes, DS1233AZ-15+ is RoHS compliant and lead-free, meeting EU Directive 2011/65/EU and JEDEC J-STD-609 Category 3 marking requirements. The "+" suffix in the part number indicates lead-free, halogen-free, and RoHS-compliant packaging. DS1233AZ-15+ is assembled in TO-92 package with matte tin lead finish and complies with IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) 1 for unlimited floor life at <30°C/85% RH.