Analog Devices Inc./Maxim Integrated DS1233A-10/T&R

Overview

DS1233A-10/T&R 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 ±10% V_CC trip accuracy (2.80–2.97V), internal 5kΩ pull-up, and operates from –40°C to +85°C in TO-92 or SOT-223 packages.

For engineers reviewing the DS1233A-10/T&R datasheet, DS1233A-10/T&R pinout, DS1233A-10/T&R application, or DS1233A-10/T&R equivalent, key selection factors include V_CC trip point tolerance, reset timeout duration, pushbutton debounce behavior, internal pull-up resistor value, and package compatibility with legacy through-hole or surface-mount layouts.

Technical Context

The DS1233A-10/T&R integrates dual monitoring functions: precision voltage detection using a temperature-compensated reference and comparator, and edge-triggered pushbutton reset with hardware debouncing. Its reset assertion logic is independent of software, ensuring reliable power-on and brown-out recovery.

It operates as a standalone reset supervisor - no external timing components required - and uses the RST pin bidirectionally: as an open-drain output during power monitoring and as an input for pushbutton detection, with internal pull-up enabling direct switch connection without external resistors.

Key Specifications

Pinout & Package

DS1233A-10/T&R is supplied in TO-92 package (3-pin, through-hole) per package code Q3+1. Pin 1 = GROUND, Pin 2 = RESET (open-drain output / pushbutton sense), Pin 3 = V_CC.

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 DS1233A-10/T&R uniquely combines fixed ±10% 3.3V monitoring, integrated pushbutton reset with hardware debounce, and TO-92/SOT-223 packaging - making it optimal for cost-sensitive, space-constrained, or legacy-compatible designs requiring both power and manual reset functions in one device.

Availability

DS1233A-10/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, and smart energy meters requiring stable component supply, long-lifecycle support, and consistent reset timing performance.

Supply support for DS1233A-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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications systems.

The DS1233A-10/T&R belongs to Maxim's EconoReset™ family of supervisory circuits, engineered for cost-effective, single-chip power monitoring and manual reset in resource-constrained microcontroller-based systems.

FAQ

What is the exact V_CC trip point range for DS1233A-10/T&R?

The DS1233A-10/T&R has a guaranteed V_CC trip point range of 2.80V to 2.97V at +25°C, corresponding to ±10% of nominal 3.3V supply. This specification is maintained across the full operating temperature range (–40°C to +85°C) due to its internal temperature-compensated voltage reference. The DS1233A-10/T&R datasheet confirms this tolerance applies specifically to the -10 variant, distinguishing it from the -15 version.

Does DS1233A-10/T&R require an external capacitor on the RESET pin?

Yes - for proper pushbutton operation, DS1233A-10/T&R requires a capacitor between 100pF and 0.01μF connected from the RESET pin to ground. This capacitor enables reliable edge detection and debounce timing. If higher reset sink current is needed (e.g., driving multiple loads), a minimum 500pF capacitor plus an external 1kΩ pull-up resistor is recommended. No capacitor is required for power-monitor-only use.

What package types are available for DS1233A-10/T&R?

The DS1233A-10/T&R is offered in TO-92 (3-pin, through-hole, package code Q3+1) and SOT-223 (4-pin, surface-mount, package code K3+1) packages. Note that the SOT-223 variant includes a fourth pin (Pin 4) tied to GROUND for enhanced thermal and electrical performance, while the TO-92 version uses only three pins. Both share identical electrical specifications and pinout mapping for Pins 1–3.

How does DS1233A-10/T&R handle pushbutton release timing?

Upon detecting a rising edge (pushbutton release), DS1233A-10/T&R asserts RESET low for a fixed 250–450ms period (typ. 350ms), independent of button press duration. This ensures consistent reset pulse width regardless of user actuation speed. The internal timer starts only after the RST line is confirmed high, preventing false triggers from contact bounce - a behavior explicitly documented in the DS1233A-10/T&R functional description.

Is DS1233A-10/T&R compatible with 5V microcontrollers?

No - DS1233A-10/T&R is specified exclusively for 3.3V systems. Its V_CC trip point (2.80–2.97V) and absolute maximum V_CC rating (+5.5V) are optimized for 3.3V rails. For 5V applications, Maxim offers the DS1233-10 (trip ~4.25–4.49V). Connecting DS1233A-10/T&R to a 5V supply risks incorrect reset assertion and violates recommended operating conditions per the DS1233A-10/T&R datasheet.