Analog Devices Inc./Maxim Integrated DS1233DZ-5

Overview

DS1233DZ-5 from Maxim Integrated (formerly Dallas Semiconductor) is a 5V microprocessor supervisory circuit that monitors VCC and asserts an active-low reset signal during power failure or out-of-tolerance conditions. It features ±5% VCC trip point (4.5–4.75 V), 350 ms reset timeout, internal 5 kΩ pull-up resistor, and operates from –40°C to +85°C in SOT-223 package. Used in embedded controllers requiring reliable power-on reset and brownout protection.

For engineers reviewing the DS1233DZ-5 datasheet, DS1233DZ-5 pinout, DS1233DZ-5 application, or DS1233DZ-5 equivalent, key selection criteria include VCC trip accuracy, reset timeout duration, package thermal performance, compatibility with 68XXX/HC16 microprocessors, and absence of external timing components.

Technical Context

The DS1233DZ-5 integrates a precision temperature-compensated voltage reference and comparator to detect VCC deviations beyond ±5%. Its internal power-fail detection logic forces RST low immediately upon undervoltage, with no external capacitor required for timing.

Reset remains asserted for 250–450 ms after VCC returns to tolerance (typ. 350 ms), ensuring stable microprocessor initialization. The device supports both power-up and power-down reset generation and includes an internal 5 kΩ pull-up on the RST output, eliminating need for discrete pull-up resistors in most 5V systems.

Key Specifications

Pinout & Package

SOT-223 package: 4-pin surface-mount, thermally enhanced, with exposed thermal pad (pin 4 = GND). Pin 1 = GND, Pin 2 = RESET (active-low open-drain), Pin 3 = VCC, Pin 4 = GND (thermal ground).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX692AESA+ and TPS3808G15DBVR, the DS1233DZ-5 offers fixed ±5% accuracy and integrated pull-up in compact SOT-223-ideal for cost-sensitive, space-constrained 5V industrial controllers where simplicity and proven reliability outweigh programmability or ultra-tight tolerance.

Availability

DS1233DZ-5 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive infotainment head units, and point-of-sale terminals requiring stable component supply and long-term production continuity.

Supply support for DS1233DZ-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

Maxim Integrated (acquired by Analog Devices in 2021) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The DS1233DZ-5 belongs to Maxim's EconoReset™ family of supervisory circuits, engineered specifically for cost-effective, single-chip power monitoring and reset generation in 5V microprocessor systems.

FAQ

What is the exact VCC trip point range for DS1233DZ-5?

The DS1233DZ-5 has a guaranteed VCC trip point range of 4.5 V (minimum) to 4.75 V (maximum), corresponding to ±5% tolerance around nominal 5V. This is specified under DC electrical characteristics at –40°C to +85°C and confirmed in the EconoReset Selection Guide. The DS1233DZ-5 uses a precision temperature-compensated reference to maintain this accuracy across its full operating temperature range.

Does DS1233DZ-5 require an external pull-up resistor on the RESET pin?

No, the DS1233DZ-5 includes an internal pull-up resistor of 3.75–6.25 kΩ on the RESET output, making it self-sufficient for standard 5V CMOS/TTL microprocessor reset inputs. An external pull-up is only needed if interfacing with higher-voltage logic families (>5V) or driving long PCB traces with significant capacitance exceeding 10 pF.

What is the reset timeout duration of DS1233DZ-5 and how is it implemented?

The DS1233DZ-5 provides a fixed reset active time of 250–450 ms (typical 350 ms) after VCC returns to tolerance. This timing is generated entirely internally using a precision RC oscillator-no external capacitor or resistor is required. The DS1233DZ-5 guarantees this hold time across temperature and supply voltage variations, ensuring reliable microprocessor initialization.

Is DS1233DZ-5 compatible with Motorola 68XXX and HC16 microprocessors?

Yes, the DS1233DZ-5 is explicitly stated as compatible with Motorola 68XXX series and HC16 microprocessors per its official datasheet features list. Its active-low open-drain RESET output, 8 mA sink capability, and 0.4 V VOL level meet the reset input requirements of these legacy microcontrollers. The DS1233DZ-5 has been widely deployed in systems based on MC68HC11 and similar architectures.

What package type is used for DS1233DZ-5 and what are its thermal advantages?

The DS1233DZ-5 is supplied in the SOT-223 package-a 4-pin surface-mount outline with an exposed thermal pad (pin 4 = GND). This package provides superior thermal performance over TO-92, enabling higher power dissipation and lower junction temperature rise in dense PCB layouts. The DS1233DZ-5's SOT-223 footprint supports automated reflow assembly and improves long-term reliability in thermally demanding industrial environments.