Analog Devices Inc./Maxim Integrated DS1233-10

Overview

DS1233-10 from Analog Devices is a 5V microprocessor supervisory circuit that provides power-on reset, power-fail detection, and pushbutton reset with debouncing. It monitors VCC at 4.25V–4.49V trip point (10% tolerance), asserts RESET for 350ms after power recovery or button release, and features internal 5kΩ pull-up and -40°C to +85°C operation - used in embedded controllers requiring reliable system initialization.

For engineers reviewing the DS1233-10 datasheet, DS1233-10 pinout, DS1233-10 application, or DS1233-10 equivalent, key selection criteria include VCC trip accuracy (±125mV), guaranteed 350ms reset pulse width, TO-92/SOT-223 package compatibility, pushbutton debounce timing, and integrated voltage reference performance under temperature variation.

Technical Context

The DS1233-10 implements dual-function supervision: precision voltage monitoring via a temperature-compensated bandgap reference and comparator, plus edge-triggered pushbutton reset with hardware debouncing. Its reset assertion logic combines analog threshold detection with digital timing control to ensure deterministic 350ms active-low output duration.

VCC monitoring uses a fixed 10% tolerance window centered at 4.375V (4.25V–4.49V), while pushbutton interface relies on RST pin bidirectional sensing - detecting falling edges for initiation and rising edges for release-triggered reset generation. Internal 5kΩ pull-up enables direct connection without external biasing.

Key Specifications

Pinout & Package

DS1233-10 is available in TO-92 (3-pin) and SOT-223 (4-pin) packages. The TO-92 variant uses pins 1 (GND), 2 (RST), and 3 (VCC). The SOT-223 variant adds pin 4 (GND) for improved thermal and grounding performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G12DBVR, the DS1233-10 uniquely integrates precise 10%-tolerance 5V monitoring, pushbutton debounce, and fixed 350ms reset in a single TO-92/SOT-223 package - reducing design complexity where standardized 5V supervision with manual override is required.

Availability

DS1233-10 is available at Aetrix Electronics and suitable for industrial PLC controllers, point-of-sale terminals, and smart energy meters requiring stable component supply across extended production lifecycles.

Supply support for DS1233-10 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 since 1965.

The DS1233-10 belongs to Analog Devices' EconoReset family of cost-optimized supervisory ICs designed specifically for reliable power-up sequencing and fault recovery in resource-constrained microcontroller-based systems.

FAQ

What is the exact VCC trip point range for DS1233-10?

The DS1233-10 has a guaranteed VCC trip point range of 4.25V to 4.49V, corresponding to ±10% tolerance around nominal 5V operation. This window is established by an internal temperature-compensated voltage reference and comparator, ensuring consistent reset assertion across the full -40°C to +85°C operating range without external calibration. DS1233-10 maintains this specification under varying load and slew rate conditions per datasheet AC characteristics.

Does DS1233-10 require an external capacitor for pushbutton operation?

Yes, DS1233-10 requires a capacitor between 100pF and 0.01μF connected from the RST pin to ground for proper pushbutton debounce functionality. This capacitor filters mechanical switch noise and enables the internal timing circuit to detect valid button press/release events. For applications demanding higher reset sink current, a minimum 500pF capacitor with a parallel 1kΩ external pull-up resistor is recommended - DS1233-10's internal 5kΩ pull-up alone may not suffice in high-noise environments.

Can DS1233-10 be used with 3.3V microcontrollers?

No, DS1233-10 is specifically designed for 5V systems and its VCC trip point (4.25V–4.49V) is incompatible with 3.3V supply monitoring. For 3.3V applications, Analog Devices offers the DS1233A-10 variant with a 2.8V–2.97V trip range. Using DS1233-10 on a 3.3V rail would result in continuous reset assertion, as VCC remains below the lower trip threshold - DS1233-10 must be powered from and monitor a true 5V domain.

What is the maximum sink current capability of the DS1233-10 RST output?

The DS1233-10 RST output can sink up to +8mA while maintaining VOL ≤ 0.4V, per its DC electrical characteristics table. This allows direct interfacing with standard TTL and CMOS microcontroller reset inputs without additional buffering. The open-drain architecture supports wired-OR configurations, and the internal 5kΩ pull-up resistor simplifies connections in single-device systems - DS1233-10 delivers robust drive strength within its specified 50μA quiescent current budget.

How does DS1233-10 handle power-down sequences?

During power-down, DS1233-10 asserts RESET when VCC falls below 4.25V and holds it active until VCC drops below 1.2V (absolute minimum rating), ensuring the microcontroller remains held in reset throughout the entire brownout event. The device's fast response (tRPD ≤ 100ns) guarantees timely reset activation before critical logic states become unstable - DS1233-10's behavior is fully characterized down to 1.2V VCC, making it suitable for systems with gradual supply decay or battery discharge profiles.