Analog Devices Inc./Maxim Integrated DS1233Z-5

Overview

DS1233Z-5 from Analog Devices is a 5V microprocessor supervisory circuit in SOT-223 package that monitors V_CC for out-of-tolerance conditions, asserts reset for 350ms after power recovery or pushbutton release, and features ±5% V_CC trip point (4.50–4.75V), internal 5kΩ pull-up, and -40°C to +85°C operation. It serves as a cost-effective reset generator in embedded microcontroller systems requiring reliable power-on and manual reset control.

For engineers reviewing the DS1233Z-5 datasheet, DS1233Z-5 pinout, DS1233Z-5 application, or DS1233Z-5 equivalent, key selection criteria include V_CC trip accuracy, reset pulse duration, pushbutton debounce behavior, SOT-223 thermal performance, and compatibility with 5V microprocessor reset inputs requiring active-low assertion and 350ms minimum hold time.

Technical Context

The DS1233Z-5 implements dual-function supervision: precision voltage monitoring using a temperature-compensated reference and comparator, and hardware-based pushbutton reset control with built-in debouncing logic. Its reset output remains asserted for 350ms after V_CC returns to tolerance or after pushbutton release - not just detection - ensuring stable processor initialization.

It operates with no external components beyond a 100pF–0.01μF capacitor on RST-to-ground, integrates a 5kΩ internal pull-up resistor, and supports both power-fail warning and manual override without software intervention. The SOT-223 variant includes a dedicated ground pin (Pin 4) distinct from the TO-92 version.

Key Specifications

Pinout & Package

SOT-223 package (4-pin, surface-mount); thermally enhanced for higher power dissipation than TO-92; Pin 4 is dedicated ground, improving noise immunity and layout flexibility versus 3-pin variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G12DBVR, the DS1233Z-5 uniquely combines 5V-specific ±5% accuracy, hardware pushbutton debounce, and 350ms fixed reset hold in a 4-pin SOT-223 - eliminating external components and firmware dependencies required by alternatives.

Availability

DS1233Z-5 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, and smart energy meters requiring stable component supply and long-lifecycle availability.

Supply support for DS1233Z-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The DS1233Z-5 belongs to the EconoReset family - designed specifically for cost-sensitive, high-volume microprocessor reset supervision in 5V embedded systems where reliability, simplicity, and thermal robustness are critical.

FAQ

What is the exact V_CC trip point range for DS1233Z-5?

The DS1233Z-5 has a guaranteed V_CC trip point range of 4.50V to 4.75V at 25°C, corresponding to ±5% tolerance around 4.625V nominal. This range is validated across the full -40°C to +85°C operating temperature and accounts for manufacturing variation and temperature drift per the datasheet's VCCTP0 specification.

Does DS1233Z-5 require an external capacitor on the RST pin?

Yes, DS1233Z-5 requires a capacitor between 100pF and 0.01μF connected from RST to ground for proper pushbutton debounce and noise immunity. For applications needing higher reset current drive, a minimum 500pF capacitor plus a parallel 1kΩ external pull-up resistor is recommended - the internal 5kΩ pull-up alone may be insufficient in noisy environments.

How does DS1233Z-5 handle pushbutton reset timing?

DS1233Z-5 detects a falling edge on RST (indicating button press), debounces internally for 250–450ms, then monitors for the rising edge (button release). Upon release, it forces RST low for exactly 350ms - independent of press duration - ensuring consistent reset pulse width whether the button is tapped or held.

Is DS1233Z-5 RoHS-compliant and lead-free?

Yes, DS1233Z-5 is RoHS-compliant and lead-free, indicated by the "+" suffix in the ordering code (DS1233Z-5+T&R). The SOT-223 package meets JEDEC standards for Pb-free soldering (260°C for 10 seconds), and all materials comply with Analog Devices' environmental specifications per the datasheet revision history.

Can DS1233Z-5 be used with 3.3V microprocessors?

No, DS1233Z-5 is specified exclusively for 5V systems with a ±5% trip point centered at 4.625V. For 3.3V applications, Analog Devices offers the DS1233A-5 variant (trip point 2.80–2.97V); using DS1233Z-5 on a 3.3V rail would result in continuous reset assertion due to undervoltage detection.