Analog Devices Inc./Maxim Integrated DS1233Z-10+T&R

Overview

DS1233Z-10+T&R from Analog Devices is a precision 5V microprocessor supervisory circuit in SOT-223 package, providing power-on reset, brown-out detection at 4.25V–4.49V (10% tolerance), pushbutton debounced reset control, 350ms reset pulse duration, and internal 5kΩ pull-up resistor. It ensures reliable system initialization in embedded controllers and industrial microprocessor systems.

For engineers reviewing the DS1233Z-10+T&R datasheet, DS1233Z-10+T&R pinout, DS1233Z-10+T&R application, or DS1233Z-10+T&R equivalent, key selection criteria include VCC trip point accuracy, reset timing consistency, pushbutton interface compatibility, thermal stability across -40°C to +85°C, and SOT-223 footprint suitability for automated assembly.

Technical Context

The DS1233Z-10+T&R integrates a temperature-compensated voltage reference and comparator to monitor VCC against a fixed 10% threshold (4.25V–4.49V). It asserts an active-low RESET signal during power failure or manual pushbutton release, holding it for precisely 350ms to ensure processor stabilization.

Its dual-function architecture combines power-fail detection with hardware-debounced pushbutton support: RST pin serves as both output and input-detecting falling edges for button press initiation and rising edges for release-triggered reset generation-requiring only a 100pF–0.01μF capacitor to ground for proper operation.

Key Specifications

Pinout & Package

SOT-223 package: 4-pin surface-mount outline with exposed thermal pad; pin 4 is dedicated ground for improved noise immunity and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G12QDBVRQ1, the DS1233Z-10+T&R uniquely combines factory-trimmed 10% 5V monitoring, hardware pushbutton debounce, and SOT-223 thermal performance in a single chip-reducing layout area and eliminating firmware reset-handling overhead.

Availability

DS1233Z-10+T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, smart energy meters, and automotive body control modules requiring stable component supply and RoHS-compliant tape-and-reel packaging.

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

The DS1233Z-10+T&R belongs to the EconoReset family of supervisory ICs designed specifically for cost-sensitive, high-volume microprocessor-based systems needing reliable power-on and manual reset functionality with minimal external components.

FAQ

What is the exact VCC trip point range for DS1233Z-10+T&R?

The DS1233Z-10+T&R has a guaranteed VCC trip point range of 4.25V to 4.49V, corresponding to its 10% tolerance specification for nominal 5V supply monitoring. This range is achieved using a precision temperature-compensated voltage reference and is validated across the full -40°C to +85°C operating temperature range. The DS1233Z-10+T&R maintains this accuracy without external calibration or trimming components.

Does DS1233Z-10+T&R require an external capacitor on the RST pin?

Yes, the DS1233Z-10+T&R requires a capacitor between 100pF and 0.01μF connected from the RST pin to ground for proper pushbutton debounce operation. This capacitor works with the internal circuitry to filter mechanical switch bounce. For applications demanding higher reset sink current, a minimum 500pF capacitor plus an external 1kΩ pull-up resistor is recommended. The DS1233Z-10+T&R will not function correctly with pushbutton input if this capacitor is omitted.

How does DS1233Z-10+T&R handle power-down sequences?

During power-down, the DS1233Z-10+T&R detects VCC falling below its 4.25V–4.49V trip threshold and asserts the active-low RESET signal within 100ns (tRPD). It holds RESET active until VCC drops below 1.2V, ensuring continuous reset assertion throughout the entire brown-out event. The DS1233Z-10+T&R's internal design prevents premature release during noisy or slowly decaying supply rails, maintaining system integrity until complete power loss.

Can DS1233Z-10+T&R be used with 3.3V microprocessors?

No, the DS1233Z-10+T&R is specifically configured for 5V systems with a 10% trip point centered at 4.375V. It is not suitable for direct use with 3.3V microprocessors, which require different supervision thresholds (e.g., 2.93V ±10%). Analog Devices offers the DS1233A-10+ variant for 3.3V applications, but the DS1233Z-10+T&R must be paired only with 5V logic families and power domains.

What is the thermal performance advantage of the SOT-223 package in DS1233Z-10+T&R?

The SOT-223 package used in the DS1233Z-10+T&R features a thermally enhanced leadframe with an exposed pad, enabling significantly better heat dissipation than TO-92 alternatives-critical in high-density industrial PCB layouts. Its 4-pin configuration includes two dedicated ground pins (Pins 1 and 4), improving noise immunity and reducing thermal resistance by up to 40% compared to 3-pin packages. This makes the DS1233Z-10+T&R more robust in sustained ambient temperatures near +85°C.