Analog Devices Inc./Maxim Integrated DS1233A-15+T&R

Overview

DS1233A-15+T&R from Maxim Integrated is a 3.3V precision voltage-monitoring reset supervisor IC with 15% V_CC trip point (2.64–2.80 V), 350ms reset timeout, internal 5kΩ pull-up resistor, and pushbutton debounce logic. It monitors microprocessor power integrity and provides reliable reset assertion during power-up, power-down, and manual reset events in embedded control systems.

For engineers reviewing the DS1233A-15+T&R datasheet, DS1233A-15+T&R pinout, DS1233A-15+T&R application, or DS1233A-15+T&R equivalent, key selection criteria include V_CC trip accuracy (±8% over temperature), guaranteed 350ms reset pulse width, SOT-223/TO-92 package compatibility, pushbutton interface requirements, and -40°C to +85°C industrial operating range.

Technical Context

The DS1233A-15+T&R implements dual-function supervision: precision analog voltage monitoring using a temperature-compensated bandgap reference and comparator, plus digital edge-detection and timing logic for external pushbutton reset. Its reset output remains active for 350ms after V_CC recovery or button release - independent of supply slew rate.

It operates with no external components beyond a 100pF–0.01μF capacitor on RST-to-GND for proper pushbutton debouncing. The internal 5kΩ pull-up eliminates need for discrete resistor, and the device draws only 50μA quiescent current at 3.3V.

Key Specifications

Pinout & Package

SOT-223 package (4-pin) with exposed thermal pad; TO-92 variant also available. Pin 4 is ground-only in SOT-223; TO-92 uses 3-pin configuration (GND–RST–V_CC).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–33D2+T and TPS3808G33DBVR, the DS1233A-15+T&R uniquely integrates pushbutton debounce, internal pull-up, and fixed 350ms reset hold - reducing BOM count and eliminating firmware-level reset handling in cost-sensitive industrial controllers.

Availability

DS1233A-15+T&R is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and smart metering applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.

Supply support for DS1233A-15+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, communications, and computing applications.

The DS1233A-15+T&R belongs to the EconoReset™ family of low-cost, easy-to-use reset supervisors targeting cost-sensitive microprocessor-based systems needing reliable power-on and manual reset control.

FAQ

What is the exact V_CC trip voltage range for DS1233A-15+T&R?

The DS1233A-15+T&R has a guaranteed V_CC trip point range of 2.64 V to 2.80 V at 25°C, corresponding to 15% tolerance around nominal 3.3V supply. This range is maintained over the full -40°C to +85°C operating temperature with ±8% total accuracy including tempco and initial tolerance, as specified in the DC Electrical Characteristics table.

Does DS1233A-15+T&R require an external capacitor for pushbutton operation?

Yes - DS1233A-15+T&R requires a capacitor between 100pF and 0.01μF connected from the RST pin to ground to ensure proper pushbutton debounce timing and noise immunity. For applications needing higher reset current drive, a minimum 500pF capacitor plus a parallel 1kΩ external pull-up resistor is recommended per the datasheet note.

What package types are offered for DS1233A-15+T&R?

The DS1233A-15+T&R is available in both SOT-223 (4-pin, with dedicated ground pin) and TO-92 (3-pin) packages. The SOT-223 variant includes Pin 4 as a second ground terminal for improved thermal performance and noise rejection, while the TO-92 version uses a standard 3-pin lead frame (GND–RST–V_CC).

How does DS1233A-15+T&R handle reset timing during power-up versus power-down?

The DS1233A-15+T&R asserts reset for ≥350ms after V_CC rises into tolerance (power-up) and maintains reset until ≥350ms after V_CC returns to tolerance following a brown-out (power-down). Both conditions use the same internal timer, ensuring consistent stabilization time regardless of fault direction.

Is the internal pull-up resistor on DS1233A-15+T&R sufficient for driving standard microprocessor reset inputs?

Yes - the DS1233A-15+T&R's internal 3.75–6.25kΩ pull-up resistor provides adequate bias for most CMOS and TTL reset inputs. When combined with its 8mA output sink capability at 0.4V, it ensures valid logic-low assertion and fast rise-time release without external components in typical 3.3V microcontroller interfaces.